{"id":111571,"date":"2026-10-01T11:22:14","date_gmt":"2026-10-01T03:22:14","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111571.html"},"modified":"2026-10-01T11:22:14","modified_gmt":"2026-10-01T03:22:14","slug":"%e3%80%90ai%e5%a4%a7%e6%a8%a1%e5%9e%8b%e6%8e%a5%e5%85%a5sdk%e3%80%91sqlite%e6%95%b0%e6%8d%ae%e6%8c%81%e4%b9%85%e5%8c%96%e6%a8%a1%e5%9d%97%e6%95%b4%e4%bd%93%e9%9c%80%e6%b1%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111571.html","title":{"rendered":"\u3010AI\u5927\u6a21\u578b\u63a5\u5165SDK\u3011SQLite\u6570\u636e\u6301\u4e45\u5316\u6a21\u5757\u6574\u4f53\u9700\u6c42"},"content":{"rendered":"

\"\u5934\u50cf\" <\/p>\n

🎬 \u4e2a\u4eba\u4e3b\u9875：\u827e\u8389\u4e1d\u52aa\u529b\u7ec3\u5251<\/font><\/p>\n

\u2744\u4e13\u680f\u4f20\u9001\u95e8：\u300aC\u8bed\u8a00\u300b\u300a\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u300b\u300aC\/C++\u5e72\u8d27\u5206\u4eab&\u5b66\u4e60\u8fc7\u7a0b\u8bb0\u5f55\u300b \u300aLinux\u64cd\u4f5c\u7cfb\u7edf\u7f16\u7a0b\u8be6\u89e3\u300b\u300a\u7b14\u8bd5\/\u9762\u8bd5\u5e38\u89c1\u7b97\u6cd5：\u4ece\u57fa\u7840\u5230\u8fdb\u9636\u300b\u300aPython\u5e72\u8d27\u5206\u4eab\u300b<\/font><\/p>\n

\u2b50\ufe0f\u4e3a\u5929\u5730\u7acb\u5fc3，\u4e3a\u751f\u6c11\u7acb\u547d，\u4e3a\u5f80\u5723\u7ee7\u7edd\u5b66，\u4e3a\u4e07\u4e16\u5f00\u592a\u5e73 <\/font><\/p>\n

\n

🎬 \u827e\u8389\u4e1d\u7684\u7b80\u4ecb：<\/font><\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\n

\u6587\u7ae0\u76ee\u5f55<\/h4>\n
    \n
  • 1 ~> SQLite\u6570\u636e\u6301\u4e45\u5316\u6a21\u5757\u6574\u4f53\u9700\u6c42<\/li>\n
  • \n
      \n
    • 1.1 \u4e1a\u52a1\u76ee\u6807<\/li>\n
    • 1.2 \u6570\u636e\u5e93\u8868\u8bbe\u8ba1<\/li>\n
    • \n
        \n
      • 1.2.1 \u4e24\u5f20\u6838\u5fc3\u6570\u636e\u8868<\/li>\n
      • 1.2.2 \u8868\u5173\u8054\u7ea6\u675f<\/li>\n<\/ul>\n<\/li>\n
      • 1.3 \u5e76\u53d1\u7ebf\u7a0b\u5b89\u5168\u8981\u6c42<\/li>\n
      • 1.4 \u6a21\u5757\u7c7b\u804c\u8d23：`DataManager`<\/li>\n<\/ul>\n<\/li>\n
      • 2 ~> \u516c\u5171\u6570\u636e\u7ed3\u6784\u4f53\u5b9a\u4e49 common.h<\/li>\n
      • \n
          \n
        • 2.1 Session\u4f1a\u8bdd\u7ed3\u6784\u4f53<\/li>\n<\/ul>\n<\/li>\n
        • 3 ~> DataManager\u5934\u6587\u4ef6 DataManager.h<\/li>\n
        • \n
            \n
          • 3.1 \u5b8c\u6574\u5934\u6587\u4ef6\u4ee3\u7801<\/li>\n
          • 3.2 \u63a5\u53e3\u4e1a\u52a1\u903b\u8f91\u8981\u70b9<\/li>\n<\/ul>\n<\/li>\n
          • 4 ~> DataManager\u6e90\u6587\u4ef6 DataManager.cpp<\/li>\n
          • \n
              \n
            • 4.1 \u6784\u9020\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570<\/li>\n
            • 4.2 \u6570\u636e\u5e93\u521d\u59cb\u5316 initDatabase<\/li>\n
            • 4.3 \u901a\u7528\u65e0\u7ed3\u679cSQL\u6267\u884c\u5de5\u5177 executeSQL<\/li>\n
            • 4.4 Session\u4f1a\u8bdd\u4e1a\u52a1\u63a5\u53e3\u5b9e\u73b0<\/li>\n
            • \n
                \n
              • 4.4.1 insertSession \u63d2\u5165\u4f1a\u8bdd<\/li>\n
              • 4.4.2 getSession \u6839\u636esessionId\u83b7\u53d6\u4f1a\u8bdd（\u52a0\u8f7d\u6d88\u606f）<\/li>\n
              • 4.4.3 updateSessionTimestamp \u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6233<\/li>\n
              • 4.4.4 deleteSession \u5220\u9664\u4f1a\u8bdd（\u7ea7\u8054\u5220\u9664\u6d88\u606f）<\/li>\n
              • 4.4.5 getAllSessionIds \u83b7\u53d6\u5168\u90e8\u4f1a\u8bddID（\u6309\u66f4\u65b0\u65f6\u95f4\u5012\u5e8f）<\/li>\n
              • 4.4.6 getAllSessions \u83b7\u53d6\u5168\u90e8\u4f1a\u8bdd\u5143\u6570\u636e，\u4e0d\u52a0\u8f7d\u6d88\u606f<\/li>\n
              • 4.4.7 getSessionCount \u83b7\u53d6\u4f1a\u8bdd\u603b\u6570<\/li>\n<\/ul>\n<\/li>\n
              • 4.5 Message\u6d88\u606f\u4e1a\u52a1\u63a5\u53e3\u5b9e\u73b0<\/li>\n
              • \n
                  \n
                • 4.5.1 insertMessage \u63d2\u5165\u6d88\u606f\u5e76\u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4<\/li>\n
                • 4.5.2 getSessionMessages \u67e5\u8be2\u4f1a\u8bdd\u5168\u90e8\u6d88\u606f<\/li>\n
                • 4.5.3 deleteSessionMessages \u624b\u52a8\u5220\u9664\u4f1a\u8bdd\u6d88\u606f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
                • 5 ~> SQLite C API\u6838\u5fc3\u539f\u7406\u4e0e\u6613\u9519\u70b9<\/li>\n
                • \n
                    \n
                  • 5.1 sqlite3_prepare_v2<\/li>\n
                  • 5.2 sqlite3_step<\/li>\n
                  • 5.3 sqlite3_bind_* \u53c2\u6570\u7ed1\u5b9a<\/li>\n
                  • 5.4 sqlite3_column_* \u83b7\u53d6\u67e5\u8be2\u7ed3\u679c<\/li>\n
                  • 5.5 SQLite\u5916\u952e\u7ea6\u675f<\/li>\n
                  • 5.6 \u7ebf\u7a0b\u5b89\u5168<\/li>\n<\/ul>\n<\/li>\n
                  • 6 ~> \u4e1a\u52a1\u8054\u52a8\u903b\u8f91：DataManager\u4e0e\u4f1a\u8bdd\u7ba1\u7406\u5668\u7ed3\u5408<\/li>\n
                  • \n
                      \n
                    • 6.1 \u4f1a\u8bdd\u7ba1\u7406\u5668SessionManager\u804c\u8d23<\/li>\n
                    • 6.2 \u6570\u636e\u6d41\u8f6c\u6d41\u7a0b<\/li>\n<\/ul>\n<\/li>\n
                    • 7 ~> \u9762\u8bd5\u9ad8\u9891\u8003\u70b9\u603b\u7ed3<\/li>\n
                    • \u7ed3\u5c3e<\/li>\n<\/ul>\n
                      \n

                      \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                      \n

                      1 ~> SQLite\u6570\u636e\u6301\u4e45\u5316\u6a21\u5757\u6574\u4f53\u9700\u6c42<\/h2>\n

                      1.1 \u4e1a\u52a1\u76ee\u6807<\/h3>\n

                      \u5c06AI\u804a\u5929SDK\u7684\u4f1a\u8bddSession\u6570\u636e\u3001\u6d88\u606fMessage\u6570\u636e\u6301\u4e45\u5316\u5b58\u50a8\u5230SQLite\u5d4c\u5165\u5f0f\u6570\u636e\u5e93\u3002<\/p>\n

                      1.2 \u6570\u636e\u5e93\u8868\u8bbe\u8ba1<\/h3>\n

                      1.2.1 \u4e24\u5f20\u6838\u5fc3\u6570\u636e\u8868<\/h4>\n
                    • sessions\u4f1a\u8bdd\u8868：\u5b58\u50a8\u4f1a\u8bdd\u5143\u6570\u636e<\/li>\n
                    • messages\u6d88\u606f\u8868：\u5b58\u50a8\u6bcf\u4e00\u6761\u804a\u5929\u6d88\u606f<\/li>\n

                      1.2.2 \u8868\u5173\u8054\u7ea6\u675f<\/h4>\n
                        \n
                      • \u6d88\u606f\u8868\u7684session_id\u4f5c\u4e3a\u5916\u952e\u5f15\u7528\u4f1a\u8bdd\u8868\u4e3b\u952esession_id<\/li>\n
                      • \u5916\u952e\u7ea6\u675f\u5f00\u542fON DELETE CASCADE\u7ea7\u8054\u5220\u9664：\u5220\u9664\u4f1a\u8bdd\u65f6，\u8be5\u4f1a\u8bdd\u4e0b\u5c5e\u5168\u90e8\u6d88\u606f\u81ea\u52a8\u5220\u9664，\u4fdd\u969c\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n

                        \u6ce8\u610f：SQLite\u9ed8\u8ba4\u5173\u95ed\u5916\u952e\u7ea6\u675f，\u6253\u5f00\u6570\u636e\u5e93\u8fde\u63a5\u540e\u9700\u8981\u6267\u884cPRAGMA foreign_keys = ON;\u5f00\u542f\u5916\u952e，\u5426\u5219\u7ea7\u8054\u5220\u9664\u4e0d\u4f1a\u751f\u6548，\u539f\u7b14\u8bb0\u9057\u6f0f\u8be5\u5173\u952e\u70b9\u3002<\/p>\n

                        1.3 \u5e76\u53d1\u7ebf\u7a0b\u5b89\u5168\u8981\u6c42<\/h3>\n
                          \n
                        • \u591a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\u4f1a\u5f15\u53d1\u7ade\u4e89\u6761\u4ef6，\u4f7f\u7528std::mutex\u4e92\u65a5\u9501\u4fdd\u62a4\u5168\u90e8\u6570\u636e\u5e93\u8bfb\u5199\u64cd\u4f5c\u3002<\/li>\n
                        • mutable std::mutex _mutex：mutable\u4fee\u9970\u5141\u8bb8const\u6210\u5458\u51fd\u6570\u5185\u90e8\u4fee\u6539\u8be5\u4e92\u65a5\u9501\u53d8\u91cf\u3002<\/li>\n<\/ul>\n

                          1.4 \u6a21\u5757\u7c7b\u804c\u8d23：DataManager<\/h3>\n
                            \n
                          • \u7ba1\u7406SQLite\u6570\u636e\u5e93\u8fde\u63a5\u751f\u547d\u5468\u671f<\/li>\n
                          • \u6570\u636e\u5e93\u521d\u59cb\u5316\u3001\u5efa\u8868<\/li>\n
                          • Session\u4f1a\u8bddCRUD\u64cd\u4f5c<\/li>\n
                          • Message\u6d88\u606fCRUD\u64cd\u4f5c<\/li>\n
                          • \u5c01\u88c5\u901a\u7528SQL\u6267\u884c\u5de5\u5177\u51fd\u6570<\/li>\n<\/ul>\n
                            \n

                            2 ~> \u516c\u5171\u6570\u636e\u7ed3\u6784\u4f53\u5b9a\u4e49 common.h<\/h2>\n

                            2.1 Session\u4f1a\u8bdd\u7ed3\u6784\u4f53<\/h3>\n

                            #<\/span>pragma<\/span> once<\/span><\/span>
                            \n#<\/span>include<\/span> <string><\/span><\/span>
                            \n#<\/span>include<\/span> <vector><\/span><\/span>
                            \n#<\/span>include<\/span> <ctime><\/span><\/span>
                            \n#<\/span>include<\/span> "common.h"<\/span><\/span><\/p>\n

                            namespace<\/span> ai_chat_sdk
                            \n{<\/span>
                            \n\/\/ \u4f1a\u8bdd\u4fe1\u606f<\/span>
                            \nstruct<\/span> Session<\/span>
                            \n{<\/span>
                            \n std::<\/span>string _sessionId;<\/span> \/\/\u4f1a\u8bdd\u552f\u4e00ID<\/span>
                            \n std::<\/span>string _modelName;<\/span> \/\/\u4f1a\u8bdd\u7ed1\u5b9a\u7684\u5927\u6a21\u578b\u540d\u79f0<\/span>
                            \n std::<\/span>vector<<\/span>Message><\/span> _messages;<\/span> \/\/\u4f1a\u8bdd\u4e0b\u5168\u90e8\u6d88\u606f，\u5185\u5b58\u7f13\u5b58，\u6570\u636e\u5e93\u5206\u8868\u5b58\u50a8<\/span>
                            \n std::<\/span>time_t _createdAt;<\/span> \/\/\u4f1a\u8bdd\u521b\u5efa\u65f6\u95f4\u6233<\/span>
                            \n std::<\/span>time_t _updatedAt;<\/span> \/\/\u4f1a\u8bdd\u6700\u540e\u66f4\u65b0\u65f6\u95f4\u6233<\/span><\/p>\n

                            explicit<\/span> Session<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> modelName =<\/span> ""<\/span>)<\/span>
                            \n :<\/span> _modelName<\/span>(<\/span>modelName)<\/span>,<\/span> _createdAt<\/span>(<\/span>0<\/span>)<\/span>,<\/span> _updatedAt<\/span>(<\/span>0<\/span>)<\/span>
                            \n {<\/span>}<\/span>
                            \n}<\/span>;<\/span><\/p>\n

                            \/\/ \u6d88\u606f\u7ed3\u6784\u4f53<\/span>
                            \nstruct<\/span> Message<\/span>
                            \n{<\/span>
                            \n std::<\/span>string _messageId;<\/span> \/\/\u6d88\u606f\u552f\u4e00ID<\/span>
                            \n std::<\/span>string _role;<\/span> \/\/\u89d2\u8272 user \/ assistant \/ system<\/span>
                            \n std::<\/span>string _content;<\/span> \/\/\u6d88\u606f\u6587\u672c\u5185\u5bb9<\/span>
                            \n std::<\/span>time_t _timestamp;<\/span> \/\/\u6d88\u606f\u53d1\u9001\u65f6\u95f4\u6233<\/span><\/p>\n

                            Message<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> role =<\/span> ""<\/span>,<\/span> const<\/span> std::<\/span>string&<\/span> content =<\/span> ""<\/span>)<\/span>
                            \n :<\/span> _role<\/span>(<\/span>role)<\/span>,<\/span> _content<\/span>(<\/span>content)<\/span>,<\/span> _timestamp<\/span>(<\/span>0<\/span>)<\/span>
                            \n {<\/span>}<\/span>
                            \n}<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            \n

                            3 ~> DataManager\u5934\u6587\u4ef6 DataManager.h<\/h2>\n

                            3.1 \u5b8c\u6574\u5934\u6587\u4ef6\u4ee3\u7801<\/h3>\n

                            #<\/span>pragma<\/span> once<\/span><\/span>
                            \n#<\/span>include<\/span> <sqlite3.h><\/span><\/span>
                            \n#<\/span>include<\/span> <string><\/span><\/span>
                            \n#<\/span>include<\/span> <mutex><\/span><\/span>
                            \n#<\/span>include<\/span> <vector><\/span><\/span>
                            \n#<\/span>include<\/span> <memory><\/span><\/span>
                            \n#<\/span>include<\/span> "common.h"<\/span><\/span><\/p>\n

                            namespace<\/span> ai_chat_sdk
                            \n{<\/span>
                            \nclass<\/span> DataManager<\/span>
                            \n{<\/span>
                            \npublic<\/span>:<\/span>
                            \n \/**
                            \n * @brief \u6784\u9020\u51fd\u6570：\u6253\u5f00\/\u521b\u5efaSQLite\u6570\u636e\u5e93
                            \n * @param dbName sqlite\u6570\u636e\u5e93\u6587\u4ef6\u8def\u5f84
                            \n *\/<\/span>
                            \n explicit<\/span> DataManager<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> dbName)<\/span>;<\/span><\/p>\n

                            \/**
                            \n * @brief \u6790\u6784\u51fd\u6570：\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5，\u91ca\u653e\u8d44\u6e90
                            \n *\/<\/span>
                            \n ~<\/span>DataManager<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                            \/\/================ Session\u4f1a\u8bdd\u76f8\u5173\u63a5\u53e3 =================<\/span>
                            \n \/\/ \u63d2\u5165\u4e00\u6761\u65b0\u4f1a\u8bdd\u8bb0\u5f55<\/span>
                            \n bool<\/span> insertSession<\/span>(<\/span>const<\/span> Session&<\/span> session)<\/span>;<\/span><\/p>\n

                            \/\/ \u6839\u636esessionId\u83b7\u53d6\u4f1a\u8bdd\u5143\u6570\u636e，\u540c\u65f6\u52a0\u8f7d\u8be5\u4f1a\u8bdd\u5168\u90e8\u5386\u53f2\u6d88\u606f<\/span>
                            \n std::<\/span>shared_ptr<<\/span>Session><\/span> getSession<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span> const<\/span>;<\/span><\/p>\n

                            \/\/ \u66f4\u65b0\u4f1a\u8bdd\u6700\u540e\u66f4\u65b0\u65f6\u95f4\u6233<\/span>
                            \n bool<\/span> updateSessionTimestamp<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId,<\/span> std::<\/span>time_t timestamp)<\/span>;<\/span><\/p>\n

                            \/\/ \u5220\u9664\u4f1a\u8bdd，\u7ea7\u8054\u5220\u9664\u4f1a\u8bdd\u4e0b\u6240\u6709\u6d88\u606f<\/span>
                            \n bool<\/span> deleteSession<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span>;<\/span><\/p>\n

                            \/\/ \u83b7\u53d6\u5168\u90e8\u4f1a\u8bddID\u5217\u8868，\u6309\u66f4\u65b0\u65f6\u95f4\u5012\u5e8f<\/span>
                            \n std::<\/span>vector<<\/span>std::<\/span>string><\/span> getAllSessionIds<\/span>(<\/span>)<\/span> const<\/span>;<\/span><\/p>\n

                            \/\/ \u83b7\u53d6\u5168\u90e8\u4f1a\u8bdd\u5143\u6570\u636e（\u4e0d\u9884\u52a0\u8f7d\u6d88\u606f，\u6309\u9700\u67e5\u8be2）<\/span>
                            \n std::<\/span>vector<<\/span>std::<\/span>shared_ptr<<\/span>Session>><\/span> getAllSessions<\/span>(<\/span>)<\/span> const<\/span>;<\/span><\/p>\n

                            \/\/ \u83b7\u53d6\u4f1a\u8bdd\u603b\u6570\u91cf<\/span>
                            \n size_t getSessionCount<\/span>(<\/span>)<\/span> const<\/span>;<\/span><\/p>\n

                            \/\/ ================ Message\u6d88\u606f\u76f8\u5173\u63a5\u53e3 =================<\/span>
                            \n \/**
                            \n * @brief \u63d2\u5165\u4e00\u6761\u6d88\u606f\u8bb0\u5f55，\u540c\u65f6\u66f4\u65b0\u6240\u5c5e\u4f1a\u8bdd\u7684update_time\u65f6\u95f4\u6233
                            \n * @param sessionId \u5f52\u5c5e\u4f1a\u8bddID
                            \n * @param message \u5f85\u63d2\u5165\u6d88\u606f\u5bf9\u8c61
                            \n *\/<\/span>
                            \n bool<\/span> insertMessage<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId,<\/span> const<\/span> Message&<\/span> message)<\/span>;<\/span><\/p>\n

                            \/\/ \u67e5\u8be2\u6307\u5b9a\u4f1a\u8bdd\u4e0b\u5168\u90e8\u5386\u53f2\u6d88\u606f<\/span>
                            \n std::<\/span>vector<<\/span>Message><\/span> getSessionMessages<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span> const<\/span>;<\/span><\/p>\n

                            \/\/ \u624b\u52a8\u5220\u9664\u6307\u5b9a\u4f1a\u8bdd\u5168\u90e8\u6d88\u606f（\u5916\u952e\u7ea7\u8054\u5220\u9664\u4e00\u822c\u4e0d\u9700\u8981\u8c03\u7528）<\/span>
                            \n bool<\/span> deleteSessionMessages<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span>;<\/span><\/p>\n

                            private<\/span>:<\/span>
                            \n \/\/ \u521d\u59cb\u5316\u6570\u636e\u5e93，\u521b\u5efasessions\u3001messages\u4e24\u5f20\u6570\u636e\u8868<\/span>
                            \n bool<\/span> initDatabase<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                            \/**
                            \n * @brief \u6267\u884c\u4e0d\u9700\u8981\u8fd4\u56de\u7ed3\u679c\u96c6\u7684SQL\u8bed\u53e5（CREATE\u3001INSERT\u3001UPDATE\u3001DELETE）
                            \n * @param sql sql\u8bed\u53e5\u5b57\u7b26\u4e32
                            \n * @return \u6210\u529f\u8fd4\u56detrue，\u5931\u8d25false
                            \n *\/<\/span>
                            \n bool<\/span> executeSQL<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sql)<\/span>;<\/span><\/p>\n

                            private<\/span>:<\/span>
                            \n sqlite3*<\/span> _db =<\/span> nullptr<\/span>;<\/span> \/\/SQLite\u6570\u636e\u5e93\u8fde\u63a5\u53e5\u67c4<\/span>
                            \n std::<\/span>string _dbName;<\/span> \/\/\u6570\u636e\u5e93\u6587\u4ef6\u540d\u79f0\/\u8def\u5f84<\/span>
                            \n mutable<\/span> std::<\/span>mutex _mutex;<\/span> \/\/\u7ebf\u7a0b\u5b89\u5168\u4e92\u65a5\u9501，const\u6210\u5458\u51fd\u6570\u53ef\u4fee\u6539<\/span>
                            \n}<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            3.2 \u63a5\u53e3\u4e1a\u52a1\u903b\u8f91\u8981\u70b9<\/h3>\n
                          • insertMessage\u63d2\u5165\u6d88\u606f\u540e\u5fc5\u987b\u540c\u6b65\u66f4\u65b0\u5bf9\u5e94\u4f1a\u8bdd****update_time，\u4fdd\u8bc1\u4f1a\u8bdd\u5217\u8868\u6392\u5e8f\u65f6\u95f4\u6b63\u786e\u3002<\/li>\n
                          • getAllSessions\u6279\u91cf\u83b7\u53d6\u4f1a\u8bdd\u65f6\u4e0d\u52a0\u8f7d\u6d88\u606f\u5217\u8868，\u907f\u514d\u5927\u91cf\u4f1a\u8bdd\u65f6\u5185\u5b58\u7206\u70b8；\u9700\u8981\u6d88\u606f\u518d\u8c03\u7528getSessionMessages\u6309\u9700\u52a0\u8f7d\u3002<\/li>\n
                          • getSession\u5355\u6761\u4f1a\u8bdd\u67e5\u8be2\u65f6，\u5185\u90e8\u81ea\u52a8\u8c03\u7528getSessionMessages\u586b\u5145_messages\u6d88\u606f\u5bb9\u5668\u3002<\/li>\n
                            \n

                            4 ~> DataManager\u6e90\u6587\u4ef6 DataManager.cpp<\/h2>\n

                            4.1 \u6784\u9020\u51fd\u6570\u3001\u6790\u6784\u51fd\u6570<\/h3>\n

                            #<\/span>include<\/span> "DataManager.h"<\/span><\/span>
                            \n#<\/span>include<\/span> "util\/myLog.h"<\/span><\/span>
                            \n#<\/span>include<\/span> <cinttypes><\/span><\/span><\/p>\n

                            namespace<\/span> ai_chat_sdk
                            \n{<\/span>
                            \nDataManager<\/span>::<\/span>DataManager<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> dbName)<\/span>
                            \n :<\/span> _dbName<\/span>(<\/span>dbName)<\/span>,<\/span> _db<\/span>(<\/span>nullptr<\/span>)<\/span>
                            \n{<\/span>
                            \n \/\/\u6253\u5f00\u6216\u8005\u521b\u5efasqlite\u6570\u636e\u5e93\u6587\u4ef6<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_open<\/span>(<\/span>dbName.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> &<\/span>_db)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"\u6253\u5f00\u6570\u636e\u5e93\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span>;<\/span>
                            \n }<\/span>
                            \n INFO<\/span>(<\/span>"\u6253\u5f00\u6570\u636e\u5e93\u6210\u529f:{}"<\/span>,<\/span> dbName)<\/span>;<\/span><\/p>\n

                            \/\/\u3010\u91cd\u8981\u3011SQLite\u9ed8\u8ba4\u5173\u95ed\u5916\u952e\u7ea6\u675f，\u5fc5\u987b\u624b\u52a8\u5f00\u542f，\u5426\u5219ON DELETE CASCADE\u5931\u6548<\/span>
                            \n executeSQL<\/span>(<\/span>"PRAGMA foreign_keys = ON;"<\/span>)<\/span>;<\/span><\/p>\n

                            \/\/\u521d\u59cb\u5316\u6570\u636e\u8868<\/span>
                            \n if<\/span> (<\/span>!<\/span>initDatabase<\/span>(<\/span>)<\/span>)<\/span>
                            \n {<\/span>
                            \n sqlite3_close<\/span>(<\/span>_db)<\/span>;<\/span>
                            \n _db =<\/span> nullptr<\/span>;<\/span>
                            \n ERR<\/span>(<\/span>"\u521d\u59cb\u5316\u6570\u636e\u5e93\u8868\u5931\u8d25"<\/span>)<\/span>;<\/span>
                            \n }<\/span>
                            \n}<\/span><\/p>\n

                            DataManager<\/span>::<\/span>~<\/span>DataManager<\/span>(<\/span>)<\/span>
                            \n{<\/span>
                            \n if<\/span> (<\/span>_db !=<\/span> nullptr<\/span>)<\/span>
                            \n {<\/span>
                            \n sqlite3_close<\/span>(<\/span>_db)<\/span>;<\/span>
                            \n _db =<\/span> nullptr<\/span>;<\/span>
                            \n }<\/span>
                            \n}<\/span><\/p>\n

                            4.2 \u6570\u636e\u5e93\u521d\u59cb\u5316 initDatabase<\/h3>\n

                            bool<\/span> DataManager<\/span>::<\/span>initDatabase<\/span>(<\/span>)<\/span>
                            \n{<\/span>
                            \n \/\/ 1. \u521b\u5efa\u4f1a\u8bdd\u8868 sessions<\/span>
                            \n std::<\/span>string createSessionTable =<\/span> R"(
                            \n CREATE TABLE IF NOT EXISTS sessions(
                            \n session_id TEXT PRIMARY KEY,
                            \n model_name TEXT NOT NULL,
                            \n create_time INTEGER NOT NULL,
                            \n update_time INTEGER NOT NULL
                            \n );
                            \n )"<\/span>;<\/span>
                            \n if<\/span> (<\/span>!<\/span>executeSQL<\/span>(<\/span>createSessionTable)<\/span>)<\/span>
                            \n {<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            \/\/ 2. \u521b\u5efa\u6d88\u606f\u8868 messages，\u8bbe\u7f6e\u5916\u952e+\u7ea7\u8054\u5220\u9664<\/span>
                            \n std::<\/span>string createMessageTable =<\/span> R"(
                            \n CREATE TABLE IF NOT EXISTS messages(
                            \n message_id TEXT PRIMARY KEY,
                            \n session_id TEXT NOT NULL,
                            \n role TEXT NOT NULL,
                            \n content TEXT NOT NULL,
                            \n timestamp INTEGER NOT NULL,
                            \n FOREIGN KEY(session_id) REFERENCES sessions(session_id) ON DELETE CASCADE
                            \n );
                            \n )"<\/span>;<\/span>
                            \n if<\/span> (<\/span>!<\/span>executeSQL<\/span>(<\/span>createMessageTable)<\/span>)<\/span>
                            \n {<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span>
                            \n return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.3 \u901a\u7528\u65e0\u7ed3\u679cSQL\u6267\u884c\u5de5\u5177 executeSQL<\/h3>\n

                            \u7528\u4e8e\u6267\u884cCREATE \/ INSERT \/ UPDATE \/ DELETE，\u4e0d\u8fd4\u56de\u67e5\u8be2\u7ed3\u679c\u96c6<\/p>\n

                            bool<\/span> DataManager<\/span>::<\/span>executeSQL<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sql)<\/span>
                            \n{<\/span>
                            \n if<\/span> (<\/span>_db ==<\/span> nullptr<\/span>)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"\u6570\u636e\u5e93\u672a\u521d\u59cb\u5316"<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span>
                            \n char<\/span>*<\/span> errMsg =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_exec<\/span>(<\/span>_db,<\/span> sql.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> nullptr<\/span>,<\/span> nullptr<\/span>,<\/span> &<\/span>errMsg)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"\u6267\u884cSQL\u5931\u8d25:{}"<\/span>,<\/span> errMsg)<\/span>;<\/span>
                            \n sqlite3_free<\/span>(<\/span>errMsg)<\/span>;<\/span> \/\/sqlite\u5206\u914d\u7684\u9519\u8bef\u5185\u5b58，\u5fc5\u987b\u4f7f\u7528sqlite_free\u91ca\u653e<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.4 Session\u4f1a\u8bdd\u4e1a\u52a1\u63a5\u53e3\u5b9e\u73b0<\/h3>\n

                            4.4.1 insertSession \u63d2\u5165\u4f1a\u8bdd<\/h4>\n

                            bool<\/span> DataManager<\/span>::<\/span>insertSession<\/span>(<\/span>const<\/span> Session&<\/span> session)<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string insertSQL =<\/span> R"(
                            \n INSERT INTO sessions(session_id, model_name, create_time, update_time)
                            \n VALUES (?, ?, ?, ?);
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> insertSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertSession \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            \/\/\u7ed1\u5b9a\u53c2\u6570，time_t\u8f6cint64_t\u5b58\u5165sqlite INTEGER\u5b57\u6bb5<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> session.<\/span>_sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 2<\/span>,<\/span> session.<\/span>_modelName.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_int64<\/span>(<\/span>stmt,<\/span> 3<\/span>,<\/span> static_cast<\/span><<\/span>int64_t<\/span>><\/span><\/span><\/span>(<\/span>session.<\/span>_createdAt)<\/span>)<\/span>;<\/span>
                            \n sqlite3_bind_int64<\/span>(<\/span>stmt,<\/span> 4<\/span>,<\/span> static_cast<\/span><<\/span>int64_t<\/span>><\/span><\/span><\/span>(<\/span>session.<\/span>_updatedAt)<\/span>)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertSession \u6267\u884cSQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"insertSession \u63d2\u5165\u4f1a\u8bdd\u6210\u529f sessionId={}"<\/span>,<\/span> session.<\/span>_sessionId)<\/span>;<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.2 getSession \u6839\u636esessionId\u83b7\u53d6\u4f1a\u8bdd（\u52a0\u8f7d\u6d88\u606f）<\/h4>\n

                            std::<\/span>shared_ptr<<\/span>Session><\/span> DataManager<\/span>::<\/span>getSession<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span> const<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string selectSQL =<\/span> R"(
                            \n SELECT model_name, create_time, update_time FROM sessions WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> selectSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSession \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> nullptr<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_ROW)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSession \u672a\u67e5\u8be2\u5230\u4f1a\u8bdd sessionId={}"<\/span>,<\/span> sessionId)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> nullptr<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            \/\/\u89e3\u6790\u67e5\u8be2\u884c\u6570\u636e<\/span>
                            \n std::<\/span>string modelName =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
                            \n int64_t<\/span> createTime =<\/span> sqlite3_column_int64<\/span>(<\/span>stmt,<\/span> 1<\/span>)<\/span>;<\/span>
                            \n int64_t<\/span> updateTime =<\/span> sqlite3_column_int64<\/span>(<\/span>stmt,<\/span> 2<\/span>)<\/span>;<\/span><\/p>\n

                            auto<\/span> session =<\/span> std::<\/span>make_shared<\/span><<\/span>Session><\/span><\/span><\/span>(<\/span>modelName)<\/span>;<\/span>
                            \n session-><\/span>_sessionId =<\/span> sessionId;<\/span>
                            \n session-><\/span>_createdAt =<\/span> static_cast<\/span><<\/span>std::<\/span>time_t><\/span><\/span><\/span>(<\/span>createTime)<\/span>;<\/span>
                            \n session-><\/span>_updatedAt =<\/span> static_cast<\/span><<\/span>std::<\/span>time_t><\/span><\/span><\/span>(<\/span>updateTime)<\/span>;<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span><\/p>\n

                            \/\/\u52a0\u8f7d\u8be5\u4f1a\u8bdd\u5168\u90e8\u5386\u53f2\u6d88\u606f<\/span>
                            \n session-><\/span>_messages =<\/span> getSessionMessages<\/span>(<\/span>sessionId)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"getSession \u83b7\u53d6\u4f1a\u8bdd\u6210\u529f sessionId={}"<\/span>,<\/span> sessionId)<\/span>;<\/span>
                            \n return<\/span> session;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.3 updateSessionTimestamp \u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6233<\/h4>\n

                            bool<\/span> DataManager<\/span>::<\/span>updateSessionTimestamp<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId,<\/span> std::<\/span>time_t timestamp)<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string updateSQL =<\/span> R"(
                            \n UPDATE sessions SET update_time = ? WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> updateSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"updateSessionTimestamp \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_int64<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> static_cast<\/span><<\/span>int64_t<\/span>><\/span><\/span><\/span>(<\/span>timestamp)<\/span>)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 2<\/span>,<\/span> sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"updateSessionTimestamp \u6267\u884cSQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"updateSessionTimestamp \u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6233\u6210\u529f sessionId={}"<\/span>,<\/span> sessionId)<\/span>;<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.4 deleteSession \u5220\u9664\u4f1a\u8bdd（\u7ea7\u8054\u5220\u9664\u6d88\u606f）<\/h4>\n

                            bool<\/span> DataManager<\/span>::<\/span>deleteSession<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string deleteSQL =<\/span> R"(
                            \n DELETE FROM sessions WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> deleteSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"deleteSession \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"deleteSession \u6267\u884cSQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"deleteSession \u5220\u9664\u4f1a\u8bdd\u6210\u529f sessionId={}"<\/span>,<\/span> sessionId)<\/span>;<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.5 getAllSessionIds \u83b7\u53d6\u5168\u90e8\u4f1a\u8bddID（\u6309\u66f4\u65b0\u65f6\u95f4\u5012\u5e8f）<\/h4>\n

                            std::<\/span>vector<<\/span>std::<\/span>string><\/span> DataManager<\/span>::<\/span>getAllSessionIds<\/span>(<\/span>)<\/span> const<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span>
                            \n std::<\/span>vector<<\/span>std::<\/span>string><\/span> result;<\/span><\/p>\n

                            std::<\/span>string selectSQL =<\/span> R"(
                            \n SELECT session_id FROM sessions ORDER BY update_time DESC;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> selectSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getAllSessionIds \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            while<\/span> (<\/span>(<\/span>rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>)<\/span> ==<\/span> SQLITE_ROW)<\/span>
                            \n {<\/span>
                            \n std::<\/span>string sid =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
                            \n result.<\/span>push_back<\/span>(<\/span>sid)<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getAllSessionIds \u67e5\u8be2\u6267\u884c\u5f02\u5e38:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"getAllSessionIds \u83b7\u53d6\u4f1a\u8bddID\u5217\u8868\u6210\u529f，\u6570\u91cf={}"<\/span>,<\/span> result.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

                            return<\/span> result;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.6 getAllSessions \u83b7\u53d6\u5168\u90e8\u4f1a\u8bdd\u5143\u6570\u636e，\u4e0d\u52a0\u8f7d\u6d88\u606f<\/h4>\n

                            std::<\/span>vector<<\/span>std::<\/span>shared_ptr<<\/span>Session>><\/span> DataManager<\/span>::<\/span>getAllSessions<\/span>(<\/span>)<\/span> const<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span>
                            \n std::<\/span>vector<<\/span>std::<\/span>shared_ptr<<\/span>Session>><\/span> result;<\/span><\/p>\n

                            std::<\/span>string selectSQL =<\/span> R"(
                            \n SELECT session_id, model_name, create_time, update_time
                            \n FROM sessions
                            \n ORDER BY update_time DESC;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> selectSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getAllSessions \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            while<\/span> (<\/span>(<\/span>rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>)<\/span> ==<\/span> SQLITE_ROW)<\/span>
                            \n {<\/span>
                            \n std::<\/span>string sid =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
                            \n std::<\/span>string modelName =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span> 1<\/span>)<\/span>)<\/span>;<\/span>
                            \n int64_t<\/span> createTime =<\/span> sqlite3_column_int64<\/span>(<\/span>stmt,<\/span> 2<\/span>)<\/span>;<\/span>
                            \n int64_t<\/span> updateTime =<\/span> sqlite3_column_int64<\/span>(<\/span>stmt,<\/span> 3<\/span>)<\/span>;<\/span><\/p>\n

                            auto<\/span> sess =<\/span> std::<\/span>make_shared<\/span><<\/span>Session><\/span><\/span><\/span>(<\/span>modelName)<\/span>;<\/span>
                            \n sess-><\/span>_sessionId =<\/span> sid;<\/span>
                            \n sess-><\/span>_createdAt =<\/span> static_cast<\/span><<\/span>std::<\/span>time_t><\/span><\/span><\/span>(<\/span>createTime)<\/span>;<\/span>
                            \n sess-><\/span>_updatedAt =<\/span> static_cast<\/span><<\/span>std::<\/span>time_t><\/span><\/span><\/span>(<\/span>updateTime)<\/span>;<\/span>
                            \n \/\/\u6b64\u5904\u4e0d\u52a0\u8f7d_messages\u6d88\u606f，\u6309\u9700\u67e5\u8be2<\/span>
                            \n result.<\/span>push_back<\/span>(<\/span>sess)<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getAllSessions \u67e5\u8be2\u6267\u884c\u5f02\u5e38:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"getAllSessions \u83b7\u53d6\u5168\u90e8\u4f1a\u8bdd\u5143\u6570\u636e\u6210\u529f，\u6570\u91cf={}"<\/span>,<\/span> result.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

                            return<\/span> result;<\/span>
                            \n}<\/span><\/p>\n

                            4.4.7 getSessionCount \u83b7\u53d6\u4f1a\u8bdd\u603b\u6570<\/h4>\n

                            size_t DataManager<\/span>::<\/span>getSessionCount<\/span>(<\/span>)<\/span> const<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string selectSQL =<\/span> R"(
                            \n SELECT COUNT(*) FROM sessions;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> selectSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSessionCount \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> 0<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_ROW)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSessionCount \u67e5\u8be2\u6267\u884c\u5f02\u5e38:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> 0<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            size_t count =<\/span> static_cast<\/span><<\/span>size_t><\/span><\/span><\/span>(<\/span>sqlite3_column_int64<\/span>(<\/span>stmt,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"getSessionCount \u83b7\u53d6\u4f1a\u8bdd\u603b\u6570={}"<\/span>,<\/span> count)<\/span>;<\/span><\/p>\n

                            return<\/span> count;<\/span>
                            \n}<\/span><\/p>\n

                            4.5 Message\u6d88\u606f\u4e1a\u52a1\u63a5\u53e3\u5b9e\u73b0<\/h3>\n

                            4.5.1 insertMessage \u63d2\u5165\u6d88\u606f\u5e76\u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4<\/h4>\n

                            bool<\/span> DataManager<\/span>::<\/span>insertMessage<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId,<\/span> const<\/span> Message&<\/span> message)<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            \/\/1.\u63d2\u5165\u6d88\u606f\u8bb0\u5f55<\/span>
                            \n std::<\/span>string insertMsgSQL =<\/span> R"(
                            \n INSERT INTO messages(message_id, session_id, role, content, timestamp)
                            \n VALUES (?, ?, ?, ?, ?);
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> insertStmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> insertMsgSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>insertStmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertMessage \u63d2\u5165\u6d88\u606f\u9884\u5904\u7406\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_text<\/span>(<\/span>insertStmt,<\/span>1<\/span>,<\/span>message.<\/span>_messageId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span>–<\/span>1<\/span>,<\/span>SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>insertStmt,<\/span>2<\/span>,<\/span>sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span>–<\/span>1<\/span>,<\/span>SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>insertStmt,<\/span>3<\/span>,<\/span>message.<\/span>_role.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span>–<\/span>1<\/span>,<\/span>SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>insertStmt,<\/span>4<\/span>,<\/span>message.<\/span>_content.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span>–<\/span>1<\/span>,<\/span>SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n sqlite3_bind_int64<\/span>(<\/span>insertStmt,<\/span>5<\/span>,<\/span>static_cast<\/span><<\/span>int64_t<\/span>><\/span><\/span><\/span>(<\/span>message.<\/span>_timestamp)<\/span>)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>insertStmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertMessage \u63d2\u5165\u6d88\u606f\u6267\u884c\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>insertStmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            \/\/2.\u540c\u6b65\u66f4\u65b0\u4f1a\u8bddupdate_time\u4e3a\u6d88\u606f\u7684\u65f6\u95f4\u6233<\/span>
                            \n std::<\/span>string updateSessionSQL =<\/span> R"(
                            \n UPDATE sessions SET update_time = ? WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> updateStmt =<\/span> nullptr<\/span>;<\/span>
                            \n rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> updateSessionSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>updateStmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertMessage \u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u9884\u5904\u7406\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>insertStmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_int64<\/span>(<\/span>updateStmt,<\/span>1<\/span>,<\/span>static_cast<\/span><<\/span>int64_t<\/span>><\/span><\/span><\/span>(<\/span>message.<\/span>_timestamp)<\/span>)<\/span>;<\/span>
                            \n sqlite3_bind_text<\/span>(<\/span>updateStmt,<\/span>2<\/span>,<\/span>sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span>–<\/span>1<\/span>,<\/span>SQLITE_TRANSIENT)<\/span>;<\/span><\/p>\n

                            rc =<\/span> sqlite3_step<\/span>(<\/span>updateStmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"insertMessage \u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6267\u884c\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>insertStmt)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>updateStmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>insertStmt)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>updateStmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"insertMessage \u63d2\u5165\u6d88\u606f\u6210\u529f messageId={}"<\/span>,<\/span> message.<\/span>_messageId)<\/span>;<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            4.5.2 getSessionMessages \u67e5\u8be2\u4f1a\u8bdd\u5168\u90e8\u6d88\u606f<\/h4>\n

                            std::<\/span>vector<<\/span>Message><\/span> DataManager<\/span>::<\/span>getSessionMessages<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span> const<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span>
                            \n std::<\/span>vector<<\/span>Message><\/span> result;<\/span><\/p>\n

                            std::<\/span>string selectSQL =<\/span> R"(
                            \n SELECT message_id, role, content, timestamp
                            \n FROM messages
                            \n WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> selectSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSessionMessages \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span><\/p>\n

                            while<\/span> (<\/span>(<\/span>rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>)<\/span> ==<\/span> SQLITE_ROW)<\/span>
                            \n {<\/span>
                            \n Message msg;<\/span>
                            \n msg.<\/span>_messageId =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span>0<\/span>)<\/span>)<\/span>;<\/span>
                            \n msg.<\/span>_role =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span>1<\/span>)<\/span>)<\/span>;<\/span>
                            \n msg.<\/span>_content =<\/span> reinterpret_cast<\/span><<\/span>const<\/span> char<\/span>*<\/span>><\/span><\/span><\/span>(<\/span>sqlite3_column_text<\/span>(<\/span>stmt,<\/span>2<\/span>)<\/span>)<\/span>;<\/span>
                            \n msg.<\/span>_timestamp =<\/span> static_cast<\/span><<\/span>std::<\/span>time_t><\/span><\/span><\/span>(<\/span>sqlite3_column_int64<\/span>(<\/span>stmt,<\/span>3<\/span>)<\/span>)<\/span>;<\/span>
                            \n result.<\/span>push_back<\/span>(<\/span>msg)<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"getSessionMessages \u67e5\u8be2\u5f02\u5e38:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> {<\/span>}<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"getSessionMessages \u83b7\u53d6\u4f1a\u8bdd\u6d88\u606f\u6210\u529f sessionId={},\u6d88\u606f\u6570\u91cf={}"<\/span>,<\/span> sessionId,<\/span> result.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

                            return<\/span> result;<\/span>
                            \n}<\/span><\/p>\n

                            4.5.3 deleteSessionMessages \u624b\u52a8\u5220\u9664\u4f1a\u8bdd\u6d88\u606f<\/h4>\n

                            \u4e1a\u52a1\u4f18\u5148\u4f7f\u7528\u4f1a\u8bdd\u5220\u9664\u7684\u5916\u952e\u7ea7\u8054\u5220\u9664，\u6b64\u63a5\u53e3\u4e3a\u5907\u7528\u63a5\u53e3<\/p>\n

                            bool<\/span> DataManager<\/span>::<\/span>deleteSessionMessages<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> sessionId)<\/span>
                            \n{<\/span>
                            \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>_mutex)<\/span>;<\/span><\/p>\n

                            std::<\/span>string deleteSQL =<\/span> R"(
                            \n DELETE FROM messages WHERE session_id = ?;
                            \n )"<\/span>;<\/span><\/p>\n

                            sqlite3_stmt*<\/span> stmt =<\/span> nullptr<\/span>;<\/span>
                            \n int<\/span> rc =<\/span> sqlite3_prepare_v2<\/span>(<\/span>_db,<\/span> deleteSQL.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> &<\/span>stmt,<\/span> nullptr<\/span>)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_OK)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"deleteSessionMessages \u9884\u5904\u7406SQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_bind_text<\/span>(<\/span>stmt,<\/span> 1<\/span>,<\/span> sessionId.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> –<\/span>1<\/span>,<\/span> SQLITE_TRANSIENT)<\/span>;<\/span>
                            \n rc =<\/span> sqlite3_step<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n if<\/span> (<\/span>rc !=<\/span> SQLITE_DONE)<\/span>
                            \n {<\/span>
                            \n ERR<\/span>(<\/span>"deleteSessionMessages \u6267\u884cSQL\u5931\u8d25:{}"<\/span>,<\/span> sqlite3_errmsg<\/span>(<\/span>_db)<\/span>)<\/span>;<\/span>
                            \n sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n return<\/span> false<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            sqlite3_finalize<\/span>(<\/span>stmt)<\/span>;<\/span>
                            \n INFO<\/span>(<\/span>"deleteSessionMessages \u5220\u9664\u4f1a\u8bdd\u5168\u90e8\u6d88\u606f\u6210\u529f sessionId={}"<\/span>,<\/span> sessionId)<\/span>;<\/span><\/p>\n

                            return<\/span> true<\/span>;<\/span>
                            \n}<\/span>
                            \n}<\/span> \/\/namespace ai_chat_sdk<\/span><\/p>\n

                            \n

                            5 ~> SQLite C API\u6838\u5fc3\u539f\u7406\u4e0e\u6613\u9519\u70b9<\/h2>\n

                            5.1 sqlite3_prepare_v2<\/h3>\n
                              \n
                            • \u4f5c\u7528：\u5c06SQL\u6587\u672c\u7f16\u8bd1\u9884\u5904\u7406\u4e3asqlite3_stmt\u8bed\u53e5\u5bf9\u8c61，\u652f\u6301\u53c2\u6570\u5360\u4f4d\u7b26?<\/li>\n
                            • \u8fd4\u56de\u503cSQLITE_OK\u4ee3\u8868\u9884\u5904\u7406\u6210\u529f\u3002<\/li>\n
                            • \u7528\u5b8cstmt\u5fc5\u987b\u8c03\u7528sqlite3_finalize\u91ca\u653e，\u5426\u5219\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n<\/ul>\n

                              5.2 sqlite3_step<\/h3>\n\n\u8fd4\u56de\u5b8f\u542b\u4e49<\/tr>\n\n\n\n
                              SQLITE_ROW<\/td>\n\u67e5\u8be2\u8bed\u53e5：\u83b7\u53d6\u5230\u4e00\u884c\u6709\u6548\u7ed3\u679c\u6570\u636e<\/td>\n<\/tr>\n
                              SQLITE_DONE<\/td>\n\u6267\u884c\u5b8c\u6210，\u6ca1\u6709\u66f4\u591a\u6570\u636e；INSERT\/UPDATE\/DELETE\u6b63\u5e38\u5b8c\u6210\u8fd4\u56de\u6b64\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              5.3 sqlite3_bind_* \u53c2\u6570\u7ed1\u5b9a<\/h3>\n
                                \n
                              • sqlite3_bind_text(stmt, index, str, len, destructor)\n
                                  \n
                                • index\u5360\u4f4d\u7b26\u4e0b\u6807\u4ece1\u5f00\u59cb，\u4e0d\u662f0<\/li>\n
                                • len\u4f20-1\u81ea\u52a8\u8bfb\u53d6c\u5b57\u7b26\u4e32\\\\0\u622a\u6b62<\/li>\n
                                • SQLITE_TRANSIENT：\u544a\u8bc9sqlite\u5185\u90e8\u590d\u5236\u4e00\u4efd\u5b57\u7b26\u4e32\u526f\u672c，\u5916\u90e8\u5b57\u7b26\u4e32\u9500\u6bc1\u4e5f\u5b89\u5168\u3002<\/li>\n<\/ul>\n<\/li>\n
                                • sqlite3_bind_int64：C++std::time_t\u5fc5\u987b\u5f3a\u8f6c\u4e3aint64_t\u5b58\u5165SQLite INTEGER\u5b57\u6bb5\u3002<\/li>\n<\/ul>\n

                                  5.4 sqlite3_column_* \u83b7\u53d6\u67e5\u8be2\u7ed3\u679c<\/h3>\n
                                    \n
                                  • \u5217\u4e0b\u6807\u4ece0\u5f00\u59cb，\u4e0ebind\u4e0b\u6807\u4e0d\u4e00\u6837，\u9ad8\u9891\u8e29\u5751\u70b9\u3002<\/li>\n
                                  • sqlite3_column_text\u8fd4\u56deconst unsigned char*，\u5fc5\u987breinterpret_cast<const char*>\u8f6c\u4e3aC++\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n

                                    5.5 SQLite\u5916\u952e\u7ea6\u675f<\/h3>\n
                                      \n
                                    • SQLite\u9ed8\u8ba4\u5173\u95ed\u5916\u952e\u7ea6\u675f，\u6253\u5f00\u6570\u636e\u5e93\u8fde\u63a5\u5fc5\u987b\u6267\u884cPRAGMA foreign_keys = ON;，\u5426\u5219ON DELETE CASCADE\u7ea7\u8054\u5220\u9664\u5b8c\u5168\u5931\u6548，\u539f\u7b14\u8bb0\u7f3a\u5931\u8be5\u5173\u952e\u70b9\u3002<\/li>\n
                                    • \u5916\u952e\u7ea6\u675f\u751f\u6548\u6761\u4ef6：\u6570\u636e\u5e93\u4e0d\u662f\u5185\u5b58\u6570\u636e\u5e93\u3001WAL\/DELETE\u65e5\u5fd7\u6a21\u5f0f\u3001\u5f00\u5173PRAGMA\u6253\u5f00\u3002<\/li>\n<\/ul>\n

                                      5.6 \u7ebf\u7a0b\u5b89\u5168<\/h3>\n
                                        \n
                                      • SQLite\u4e09\u79cd\u7ebf\u7a0b\u6a21\u5f0f：Single\u2011Thread \/ Multi\u2011Thread \/ Serialized\u3002<\/li>\n
                                      • \u672c\u9879\u76ee\u91c7\u7528Serialized\u4e32\u884c\u6a21\u5f0f，\u5e94\u7528\u5c42\u989d\u5916\u52a0std::mutex\u505a\u4e8c\u6b21\u9632\u62a4，\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u8bfb\u5199\u5b89\u5168\u3002<\/li>\n
                                      • mutable std::mutex：const\u6210\u5458\u51fd\u6570\u5185\u90e8\u4e5f\u53ef\u4ee5\u5bf9\u9501\u8fdb\u884c\u52a0\u9501\u89e3\u9501\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n
                                        \n

                                        6 ~> \u4e1a\u52a1\u8054\u52a8\u903b\u8f91：DataManager\u4e0e\u4f1a\u8bdd\u7ba1\u7406\u5668\u7ed3\u5408<\/h2>\n

                                        6.1 \u4f1a\u8bdd\u7ba1\u7406\u5668SessionManager\u804c\u8d23<\/h3>\n
                                      • \u5728\u5185\u5b58\u4e2d\u7ba1\u7406\u6d3b\u8dc3\u4f1a\u8bdd；<\/li>\n
                                      • \u4f1a\u8bdd\u521b\u5efa\u3001\u9500\u6bc1\u65f6\u8c03\u7528DataManager\u6301\u4e45\u5316\u5199\u5165\u6570\u636e\u5e93；<\/li>\n
                                      • \u7a0b\u5e8f\u542f\u52a8\u65f6\u8c03\u7528DataManager\u52a0\u8f7d\u5386\u53f2\u4f1a\u8bdd\u5217\u8868；<\/li>\n
                                      • \u6bcf\u6b21\u53d1\u9001\/\u63a5\u6536AI\u6d88\u606f，\u8c03\u7528insertMessage\u5199\u5165\u6d88\u606f，\u63a5\u53e3\u5185\u90e8\u81ea\u52a8\u66f4\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6233\u3002<\/li>\n

                                        6.2 \u6570\u636e\u6d41\u8f6c\u6d41\u7a0b<\/h3>\n
                                      • \u65b0\u5efa\u4f1a\u8bdd：\u5185\u5b58\u751f\u6210Session\u5bf9\u8c61 \u2192 DataManager::insertSession()\u5199\u5165sessions\u8868\u3002<\/li>\n
                                      • \u53d1\u9001\/\u6536\u5230\u6d88\u606f：\u5185\u5b58\u751f\u6210Message\u5bf9\u8c61 \u2192 DataManager::insertMessage(sessionId, msg)\u5199\u5165messages\u8868，\u81ea\u52a8\u66f4\u65b0\u4f1a\u8bddupdate_time\u3002<\/li>\n
                                      • \u6253\u5f00\u5386\u53f2\u4f1a\u8bdd：\u4f20\u5165sessionId\u8c03\u7528getSession(sessionId)，\u52a0\u8f7d\u4f1a\u8bdd\u5143\u6570\u636e+\u5168\u90e8\u5386\u53f2\u6d88\u606f\u5230\u5185\u5b58Session\u5bf9\u8c61\u3002<\/li>\n
                                      • \u5220\u9664\u4f1a\u8bdd：\u8c03\u7528deleteSession(sessionId)，\u6570\u636e\u5e93\u4f9d\u9760\u5916\u952eON DELETE CASCADE\u81ea\u52a8\u5220\u9664\u8be5\u4f1a\u8bdd\u6240\u6709\u6d88\u606f\u3002<\/li>\n
                                      • \u7a0b\u5e8f\u542f\u52a8：\u8c03\u7528getAllSessionIds()\u83b7\u53d6\u5168\u90e8\u4f1a\u8bddID，\u6309\u9700\u52a0\u8f7d\u4f1a\u8bdd\u5143\u6570\u636e\u3002<\/li>\n
                                        \n

                                        7 ~> \u9762\u8bd5\u9ad8\u9891\u8003\u70b9\u603b\u7ed3<\/h2>\n
                                      • \u4e3a\u4ec0\u4e48\u4f1a\u8bdd\u548c\u6d88\u606f\u5206\u4e24\u5f20\u8868\u5b58\u50a8？\n
                                      • \u4e00\u5bf9\u591a\u5173\u7cfb：\u4e00\u4e2aSession\u5bf9\u5e94\u591a\u6761Message；<\/li>\n
                                      • \u51cf\u5c11\u5197\u4f59，\u4f1a\u8bdd\u5143\u6570\u636e\u53ea\u5b58\u50a8\u4e00\u4efd；<\/li>\n
                                      • \u5229\u7528\u5916\u952e\u7ea7\u8054\u5220\u9664\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n<\/li>\n
                                      • \u4e3a\u4ec0\u4e48\u63d2\u5165\u6d88\u606f\u7684\u65f6\u5019，\u5fc5\u987b\u66f4\u65b0\u4f1a\u8bddupdate_time？\n
                                      • \u4f1a\u8bdd\u5217\u8868\u6309\u7167update_time\u5012\u5e8f\u5c55\u793a，\u6700\u65b0\u804a\u5929\u4f1a\u8bdd\u6392\u5728\u6700\u4e0a\u65b9；\u65b0\u589e\u6d88\u606f\u4ee3\u8868\u4f1a\u8bdd\u53d1\u751f\u53d8\u66f4，\u9700\u8981\u5237\u65b0\u4f1a\u8bdd\u65f6\u95f4\u6233\u3002<\/li>\n<\/li>\n
                                      • SQLite stmt\u5bf9\u8c61\u4e3a\u4ec0\u4e48\u5fc5\u987bsqlite3_finalize？\n
                                      • stmt\u5bf9\u8c61\u662fsqlite\u5185\u90e8\u5806\u5185\u5b58\u5206\u914d，\u4e0d\u91ca\u653e\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f，\u957f\u671f\u8fd0\u884c\u7a0b\u5e8f\u5185\u5b58\u6301\u7eed\u4e0a\u6da8\u3002<\/li>\n<\/li>\n
                                      • SQLITE_TRANSIENT\u7684\u4f5c\u7528\u662f\u4ec0\u4e48？\n
                                      • \u544a\u8bc9SQLite\u9700\u8981\u590d\u5236\u4e00\u4efd\u5b57\u7b26\u4e32\u526f\u672c；\u5f53\u5916\u90e8\u4f20\u5165\u7684\u5b57\u7b26\u4e32\u751f\u547d\u5468\u671f\u7ed3\u675f\u9500\u6bc1，SQLite\u5185\u90e8\u4ecd\u7136\u6301\u6709\u6709\u6548\u62f7\u8d1d，\u9632\u6b62\u91ce\u6307\u9488\u3002<\/li>\n<\/li>\n
                                      • \u4e3a\u4ec0\u4e48\u8981\u7528mutable\u4fee\u9970mutex\u6210\u5458\u53d8\u91cf？\n
                                      • const\u6210\u5458\u51fd\u6570\u4e0d\u5141\u8bb8\u4fee\u6539\u7c7b\u6210\u5458\u53d8\u91cf；\u4e92\u65a5\u9501\u52a0\u9501\u89e3\u9501\u9700\u8981\u4fee\u6539\u9501\u5185\u90e8\u72b6\u6001，mutable\u5141\u8bb8const\u51fd\u6570\u4fee\u6539\u8be5\u6210\u5458\u3002<\/li>\n<\/li>\n
                                      • SQLite\u5916\u952e\u7ea7\u8054\u5220\u9664\u4e0d\u751f\u6548\u6392\u67e5\u70b9\n
                                      • \u662f\u5426\u6267\u884cPRAGMA foreign_keys = ON\u6253\u5f00\u5f00\u5173；<\/li>\n
                                      • \u786e\u8ba4\u5efa\u8868\u8bed\u53e5FOREIGN KEY + ON DELETE CASCADE\u8bed\u6cd5\u6b63\u786e；<\/li>\n
                                      • \u786e\u8ba4\u4e0d\u662f\u5185\u5b58\u6570\u636e\u5e93\u3002<\/li>\n<\/li>\n
                                        \n

                                        \u7ed3\u5c3e<\/h2>\n

                                        uu\u4eec，\u672c\u6587\u7684\u5185\u5bb9\u5230\u8fd9\u91cc\u5c31\u5168\u90e8\u7ed3\u675f\u4e86，\u827e\u8389\u4e1d\u5728\u8fd9\u91cc\u518d\u6b21\u611f\u8c22\u60a8\u7684\u9605\u8bfb！<\/font><\/p>\n\n\n\n
                                        \n

                                        \n

                                        \u827e\u8389\u4e1d\u52aa\u529b\u7ec3\u5251<\/font>
                                        \n <\/h3>\n

                                        <\/b><\/p>\n

                                        C\/C++ & Linux \u5e95\u5c42\u63a2\u7d22\u8005 | \u4e00\u4e2a\u6b63\u5728\u52aa\u529b\u7ec3\u5251\u7684\u6280\u672f\u535a\u4e3b<\/font><\/p>\n

                                        \n

                                        👀
                                        \n \u3010\u5173\u6ce8\u3011<\/b> \u8ddf\u968f\u6211\u4e00\u8d77\u6df1\u8015\u6280\u672f\u9886\u57df，\u89c1\u8bc1\u6bcf\u4e00\u6b21\u6210\u957f\u3002<\/p>\n

                                        \u2764\ufe0f
                                        \n \u3010\u70b9\u8d5e\u3011<\/b> \u8ba9\u4f18\u8d28\u5185\u5bb9\u88ab\u66f4\u591a\u4eba\u770b\u89c1，\u8ba9\u77e5\u8bc6\u4f20\u9012\u66f4\u6709\u529b\u91cf\u3002<\/p>\n

                                        \u2b50
                                        \n \u3010\u6536\u85cf\u3011<\/b> \u628a\u6838\u5fc3\u77e5\u8bc6\u70b9\u5b58\u597d，\u5728\u9700\u8981\u65f6\u968f\u65f6\u67e5\u3001\u968f\u65f6\u7528\u3002<\/p>\n

                                        💬
                                        \n \u3010\u8bc4\u8bba\u3011<\/b> \u5206\u4eab\u4f60\u7684\u7ecf\u9a8c\u6216\u7591\u95ee，\u8bc4\u8bba\u533a\u4e00\u8d77\u4ea4\u6d41\u907f\u5751！<\/p>\n

                                        \u4e0d\u8981\u5fd8\u8bb0\u7ed9\u535a\u4e3b\u201c\u4e00\u952e\u56db\u8fde\u201d\u54e6！<\/font><\/b><\/p>\n

                                        \u201c\u4eca\u65e5\u7ec3\u5251\u8fbe\u6210！\u201d<\/font><\/p>\n

                                        <\/p>\n

                                        \u201c\u6280\u672f\u4e4b\u8def\u96be\u514d\u6709\u56f0\u60d1，\u4f46\u540c\u884c\u7684\u4eba\u4f1a\u8ba9\u524d\u8fdb\u66f4\u6709\u65b9\u5411\u3002\u201d <\/font><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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