{"id":120720,"date":"2026-11-01T05:40:37","date_gmt":"2026-10-31T21:40:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/120720.html"},"modified":"2026-11-01T05:40:37","modified_gmt":"2026-10-31T21:40:37","slug":"odb-%e4%b8%8e-mysql%ef%bc%9ac-%e9%87%8c%e7%9a%84-orm-%e5%ae%9e%e8%b7%b5%ef%bc%88%e7%b1%bb%e5%8d%b3%e8%a1%a8%e3%80%81%e4%ba%8b%e5%8a%a1%e9%93%81%e5%be%8b%e4%b8%8e%e6%9f%a5%e8%af%a2%e5%b0%81%e8%a3%85","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/120720.html","title":{"rendered":"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261031214036-6ae6605425eeb.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p> &#x1f4da; \u7cfb\u5217&#xff1a;C&#043;&#043; \u5de5\u7a0b\u5b9e\u8df5 \u7b2c 17 \u7bc7 \u23f1 \u9605\u8bfb\u7ea6 15 \u5206\u949f <\/p>\n<p>&#x1f4cc; \u4e00\u53e5\u8bdd\u603b\u7ed3<\/p>\n<p>\u7f13\u5b58\u6321\u4e0d\u4f4f\u7684\u90a3\u90e8\u5206\u7ec8\u7a76\u8981\u843d\u5230\u5173\u7cfb\u5e93&#xff0c;\u800c\u5728 C&#043;&#043; \u91cc\u624b\u62fc SQL \u662f\u5178\u578b\u7684\u300c\u5199\u4e09\u904d\u3001\u6539\u4e00\u5904\u3001\u6f0f\u4e24\u5904\u300d\u3002\u672c\u6587\u7528 ODB \u628a\u8fd9\u5c42\u6536\u6389&#xff1a;C&#043;&#043; \u7c7b\u5c31\u662f\u8868\u5b9a\u4e49&#xff0c;\u4e00\u6761 odb \u547d\u4ee4\u5728\u7f16\u8bd1\u671f\u751f\u6210\u5168\u90e8\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e1a\u52a1\u4fa7\u53ea\u9762\u5bf9\u5bf9\u8c61&#xff1b;\u518d\u8bb2\u6e05\u4e8b\u52a1\u94c1\u5f8b\u3001\u67e5\u8be2\u8868\u8fbe\u5f0f\u4e0e\u591a\u8868\u89c6\u56fe&#xff0c;\u6700\u540e\u7528\u300c\u914d\u7f6e &#043; \u5de5\u5382 &#043; DAO\u300d\u5206\u5c42\u6536\u53e3\u3002<\/p>\n<p>&#x1f4c4; \u6458\u8981<\/p>\n<p>\u672c\u6587\u4ee5 C&#043;&#043; \u5fae\u670d\u52a1\u811a\u624b\u67b6\u4e2d\u7684\u70b9\u64ad\u7cfb\u7edf\u4e3a\u4f8b&#xff0c;\u4ecb\u7ecd\u5982\u4f55\u7528 ODB \u5728 C&#043;&#043; \u91cc\u5b9e\u73b0 ORM \u5f0f\u6301\u4e45\u5316\u3002\u6838\u5fc3\u601d\u8def\u662f\u8ba9\u7c7b\u5b9a\u4e49\u6210\u4e3a\u8868\u7684\u552f\u4e00\u4e8b\u5b9e\u6765\u6e90&#xff1a;\u7ed9\u5b57\u6bb5\u52a0\u4e0a #pragma db \u6807\u6ce8&#xff0c;\u4e00\u6761 odb \u547d\u4ee4\u5373\u53ef\u5728\u6784\u5efa\u671f\u751f\u6210\u6301\u4e45\u5316\u4ee3\u7801\u4e0e\u5efa\u8868 SQL&#xff0c;\u4e1a\u52a1\u4fa7\u53ea\u9762\u5bf9\u5bf9\u8c61\u3001\u4e0d\u5199\u4e00\u884c SQL\u3002\u6587\u7ae0\u4f9d\u6b21\u8986\u76d6 pragma \u6807\u6ce8\u4e0e\u7c7b\u578b\u6620\u5c04\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0b\u7684\u589e\u5220\u6539\u67e5\u3001\u67e5\u8be2\u8868\u8fbe\u5f0f\u4e0e\u591a\u8868\u89c6\u56fe&#xff0c;\u6700\u540e\u7528\u300c\u914d\u7f6e &#043; \u5de5\u5382 &#043; DAO\u300d\u5b8c\u6210\u4e8c\u6b21\u5c01\u88c5&#xff0c;\u5e76\u6c47\u603b\u4e86\u6784\u5efa\u94fe\u8def\u4e0e pragma \u5bf9\u9f50\u4e0a\u7684\u5e38\u89c1\u5751\u3002<\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>1. \u5148\u770b\u7ed3\u679c&#xff1a;\u4e00\u6b21\u63d2\u5165\u62ff\u5230\u81ea\u589e\u4e3b\u952e<\/li>\n<li>2. \u540d\u8bcd\u901f\u67e5<\/li>\n<li>3. \u4e3a\u4ec0\u4e48\u8981 ORM&#xff1a;C&#043;&#043; \u91cc\u624b\u62fc SQL \u7684\u4e09\u4e2a\u75db\u70b9<\/li>\n<li>4. \u7c7b\u5c31\u662f\u8868&#xff1a;pragma \u600e\u4e48\u6807\u6ce8<\/li>\n<li>5. \u589e\u5220\u6539\u67e5&#xff1a;\u6bcf\u6b65\u90fd\u5728\u4e8b\u52a1\u91cc<\/li>\n<li>6. \u67e5\u8be2\u4e0e\u5c01\u88c5&#xff1a;\u8868\u8fbe\u5f0f\u3001\u89c6\u56fe\u3001\u5de5\u5382<\/li>\n<li>7. \u8e29\u5751\u4e0e\u5c0f\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1. \u5148\u770b\u7ed3\u679c&#xff1a;\u4e00\u6b21\u63d2\u5165\u62ff\u5230\u81ea\u589e\u4e3b\u952e<\/h3>\n<p>\u5bf9\u8c61\u4e22\u8fdb\u53bb&#xff0c;\u4e3b\u952e\u62ff\u56de\u6765&#xff0c;\u5168\u7a0b\u6ca1\u5199\u4e00\u884c SQL\u3002<\/p>\n<p><span class=\"token function\">make<\/span>            <span class=\"token comment\"># \u5148\u8dd1 odb \u751f\u6210\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u518d\u7f16\u8bd1<\/span><br \/>\n.\/odb_demo<\/p>\n<p>\u63d2\u5165\u5b8c\u6210&#xff0c;\u7b2c\u4e00\u4e2a id &#061; 1<br \/>\n\u67e5\u5f97: 1 \u793a\u4f8b\u5f71\u7247 A 120s<br \/>\n\u5df2\u628a id&#061;1 \u7684\u65f6\u957f\u6539\u4e3a 200s<br \/>\n\u5220\u9664\u4e86 1 \u884c<\/p>\n<p>make \u4e4b\u540e\u76ee\u5f55\u91cc\u4f1a\u591a\u51fa\u56db\u4e2a\u6587\u4ef6&#xff0c;\u5b83\u4eec\u662f\u8fd9\u4e00\u6b65\u7684\u5173\u952e&#xff1a;<\/p>\n<p>video-odb.cc  video-odb.hxx  video-odb.ixx  video.sql<\/p>\n<p>\u524d\u4e09\u4e2a\u662f ODB \u751f\u6210\u7684\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;video.sql \u662f\u5efa\u8868\u8bed\u53e5\u3002\u4e5f\u5c31\u662f\u8bf4&#xff1a;\u4f60\u53ea\u5199\u4e86 video.hxx \u91cc\u90a3\u4e2a\u7c7b&#xff0c;\u5269\u4e0b\u7684 INSERT\/UPDATE\/SELECT \u4e0e CREATE TABLE \u5168\u90e8\u7531\u5de5\u5177\u751f\u6210\u3002<\/p>\n<h3>2. \u540d\u8bcd\u901f\u67e5<\/h3>\n<table>\n<tr>\u540d\u8bcd\u4e00\u53e5\u8bdd\u89e3\u91ca<\/tr>\n<tbody>\n<tr>\n<td>ORM<\/td>\n<td>\u628a\u300c\u5bf9\u8c61 \u2190\u2192 \u8868\u300d\u7684\u8f6c\u6362\u4ea4\u7ed9\u6846\u67b6&#xff0c;\u4e1a\u52a1\u4ee3\u7801\u53ea\u9762\u5bf9\u5bf9\u8c61\u4e0d\u518d\u624b\u62fc SQL<\/td>\n<\/tr>\n<tr>\n<td>\u6301\u4e45\u5316\u7c7b<\/td>\n<td>\u52a0\u4e86 pragma \u6807\u6ce8\u3001\u5b57\u6bb5\u4f1a\u843d\u5230\u8868\u91cc\u7684 C&#043;&#043; \u7c7b&#xff0c;\u7c7b\u5373\u8868\u5b9a\u4e49<\/td>\n<\/tr>\n<tr>\n<td>#pragma db object<\/td>\n<td>\u6807\u6ce8\u300c\u8fd9\u662f\u6301\u4e45\u5316\u7c7b\u300d&#xff0c;\u9ed8\u8ba4\u8868\u540d\u5c31\u7528\u7c7b\u540d<\/td>\n<\/tr>\n<tr>\n<td>#pragma db id auto<\/td>\n<td>\u6807\u6ce8\u8fd9\u4e00\u5217\u662f\u4e3b\u952e&#xff0c;\u4e14\u503c\u7531\u6570\u636e\u5e93\u81ea\u589e\u3001\u63d2\u5165\u540e\u56de\u586b\u5230\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td>#pragma db not_null<\/td>\n<td>\u6807\u6ce8\u8be5\u5217\u4e0d\u5141\u8bb8\u4e3a\u7a7a&#xff0c;\u7a7a\u503c\u63d2\u5165\u4f1a\u62a5\u9519<\/td>\n<\/tr>\n<tr>\n<td>\u4ee3\u7801\u751f\u6210<\/td>\n<td>ODB \u5728\u6784\u5efa\u9636\u6bb5\u751f\u6210 .cc\/.hxx \u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e0d\u662f\u8fd0\u884c\u671f\u53cd\u5c04<\/td>\n<\/tr>\n<tr>\n<td>\u4e8b\u52a1<\/td>\n<td>\u4e00\u7ec4\u64cd\u4f5c\u8981\u4e48\u5168\u6210\u529f\u8981\u4e48\u5168\u56de\u6eda&#xff1b;ODB \u91cc\u6ca1\u6709\u4e8b\u52a1\u8fde persist \u90fd\u4e0d\u751f\u6548<\/td>\n<\/tr>\n<tr>\n<td>\u8fde\u63a5\u6c60<\/td>\n<td>\u63d0\u524d\u5efa\u597d\u4e00\u6279\u8fde\u63a5\u53cd\u590d\u501f\u8fd8&#xff0c;\u907f\u514d\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u91cd\u65b0\u63e1\u624b<\/td>\n<\/tr>\n<tr>\n<td>\u6574\u884c\u8986\u76d6<\/td>\n<td>update \u6309\u4e3b\u952e\u628a\u6574\u884c\u6240\u6709\u5217\u91cd\u5199\u4e00\u904d&#xff0c;\u6240\u4ee5\u5fc5\u987b\u5148\u53d6\u5168\u5bf9\u8c61\u518d\u6539<\/td>\n<\/tr>\n<tr>\n<td>\u67e5\u8be2\u8868\u8fbe\u5f0f<\/td>\n<td>Query::\u6210\u5458\u540d \u62fc\u51fa\u7684\u6761\u4ef6\u5728\u7f16\u8bd1\u671f\u68c0\u67e5&#xff0c;\u6210\u5458\u540d\u5199\u9519\u76f4\u63a5\u7f16\u4e0d\u8fc7<\/td>\n<\/tr>\n<tr>\n<td>\u89c6\u56fe&#xff08;view&#xff09;<\/td>\n<td>\u591a\u8868 JOIN \u65f6\u88c5\u67e5\u8be2\u7ed3\u679c\u7684\u8f7d\u4f53&#xff0c;\u4e0d\u5efa\u8868\u53ea\u662f\u4e34\u65f6\u7ed3\u6784<\/td>\n<\/tr>\n<tr>\n<td>odb::nullable<\/td>\n<td>\u8868\u8fbe\u300c\u8fd9\u4e00\u5217\u53ef\u4ee5\u4e3a\u7a7a\u300d&#xff0c;\u5bf9\u5e94 SQL \u7684 INT NULL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3. \u4e3a\u4ec0\u4e48\u8981 ORM&#xff1a;C&#043;&#043; \u91cc\u624b\u62fc SQL \u7684\u4e09\u4e2a\u75db\u70b9<\/h3>\n<p>\u4e0d\u662f\u5acc SQL \u4e0d\u597d\u5199&#xff0c;\u662f\u5acc\u540c\u4e00\u4e2a\u7ed3\u6784\u5728\u4e09\u5904\u91cd\u590d\u3001\u4e14\u6ca1\u6709\u4efb\u4f55\u7f16\u8bd1\u671f\u68c0\u67e5\u3002<\/p>\n<p>\u4e0d\u5f15\u5165 ORM \u7684\u5199\u6cd5\u957f\u8fd9\u6837&#xff1a;\u62fc\u5b57\u6bb5\u3001\u62fc VALUES\u3001\u62fc WHERE&#xff0c;\u7136\u540e mysql_query&#xff0c;\u518d mysql_fetch_row \u62ff\u56de\u5b57\u7b26\u4e32\u6570\u7ec4&#xff0c;\u6309\u5217\u5e8f\u53f7\u624b\u5de5\u585e\u56de\u7ed3\u6784\u4f53\u3002\u4e09\u4e2a\u75db\u70b9\u90fd\u975e\u5e38\u5177\u4f53&#xff1a;<\/p>\n<table>\n<tr>\u75db\u70b9\u8868\u73b0\u540e\u679c<\/tr>\n<tbody>\n<tr>\n<td>\u7ed3\u6784\u5199\u4e09\u904d<\/td>\n<td>INSERT \/ UPDATE \/ SELECT \u5404\u5199\u4e00\u904d\u5b57\u6bb5<\/td>\n<td>\u52a0\u4e00\u4e2a\u6210\u5458\u8981\u540c\u6b65\u6539\u4e09\u5904<\/td>\n<\/tr>\n<tr>\n<td>\u7c7b\u578b\u5b89\u5168\u4e3a\u96f6<\/td>\n<td>\u5b57\u7b26\u4e32\u3001\u6574\u6570\u3001\u65f6\u95f4\u90fd\u9760\u624b\u62fc\u5b57\u9762\u91cf<\/td>\n<td>\u8f6c\u4e49\u6f0f\u4e00\u4e2a\u5c31\u662f\u6ce8\u5165\u6216\u810f\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u8fd4\u56de\u4fa7\u9760\u5e8f\u53f7<\/td>\n<td>\u6309\u5217\u4e0b\u6807\u53d6\u503c<\/td>\n<td>\u5217\u987a\u5e8f\u4e00\u6362\u5c31\u6084\u6084\u9519\u4f4d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>ODB \u7684\u505a\u6cd5\u662f\u8ba9\u7c7b\u5b9a\u4e49\u6210\u4e3a\u552f\u4e00\u4e8b\u5b9e\u6765\u6e90&#xff1a;\u5b57\u6bb5\u52a0 pragma&#xff0c;\u5de5\u5177\u751f\u6210\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e1a\u52a1\u4ee3\u7801\u53ea\u64cd\u4f5c\u5bf9\u8c61\u3002\u7c7b\u578b\u5728\u7f16\u8bd1\u671f\u5c31\u80fd\u88ab\u68c0\u67e5&#xff0c;\u5b57\u6bb5\u540d\u5199\u9519\u7f16\u4e0d\u8fc7\u3002<\/p>\n<p>\u2139\ufe0f \u5b83\u662f\u300c\u4ee3\u7801\u751f\u6210\u300d\u800c\u4e0d\u662f\u300c\u8fd0\u884c\u671f\u6620\u5c04\u300d<\/p>\n<p>ODB \u4e0d\u662f\u8fd0\u884c\u671f\u53cd\u5c04\u6846\u67b6&#xff0c;\u5b83\u5728\u6784\u5efa\u9636\u6bb5\u5c31\u628a\u6620\u5c04\u4ee3\u7801\u751f\u6210\u6210 C&#043;&#043; \u6587\u4ef6&#xff0c;\u548c\u4f60\u81ea\u5df1\u7684 .cc \u4e00\u8d77\u7f16\u8bd1\u3002\u6240\u4ee5\u6784\u5efa\u6d41\u7a0b\u591a\u4e86\u4e00\u6b65 odb \u547d\u4ee4\u2014\u2014\u8fd9\u662f\u5b83\u552f\u4e00\u7684\u4f7f\u7528\u95e8\u69db\u3002<\/p>\n<p>\u6574\u4e2a\u5de5\u4f5c\u6d41\u53ea\u6709\u56db\u6b65&#xff0c;\u591a\u51fa\u6765\u7684\u90a3\u4e00\u6b65\u5c31\u662f\u751f\u6210&#xff1a;<\/p>\n<p>  #mermaid-svg-fq1babFGLkyZHUyo{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-fq1babFGLkyZHUyo .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-fq1babFGLkyZHUyo .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-fq1babFGLkyZHUyo .error-icon{fill:#552222;}#mermaid-svg-fq1babFGLkyZHUyo .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-fq1babFGLkyZHUyo .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-fq1babFGLkyZHUyo .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-fq1babFGLkyZHUyo .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-fq1babFGLkyZHUyo .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-fq1babFGLkyZHUyo .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-fq1babFGLkyZHUyo .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-fq1babFGLkyZHUyo .marker{fill:#333333;stroke:#333333;}#mermaid-svg-fq1babFGLkyZHUyo .marker.cross{stroke:#333333;}#mermaid-svg-fq1babFGLkyZHUyo svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-fq1babFGLkyZHUyo p{margin:0;}#mermaid-svg-fq1babFGLkyZHUyo .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-fq1babFGLkyZHUyo .cluster-label text{fill:#333;}#mermaid-svg-fq1babFGLkyZHUyo .cluster-label span{color:#333;}#mermaid-svg-fq1babFGLkyZHUyo .cluster-label span p{background-color:transparent;}#mermaid-svg-fq1babFGLkyZHUyo .label text,#mermaid-svg-fq1babFGLkyZHUyo span{fill:#333;color:#333;}#mermaid-svg-fq1babFGLkyZHUyo .node rect,#mermaid-svg-fq1babFGLkyZHUyo .node circle,#mermaid-svg-fq1babFGLkyZHUyo .node ellipse,#mermaid-svg-fq1babFGLkyZHUyo .node polygon,#mermaid-svg-fq1babFGLkyZHUyo .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-fq1babFGLkyZHUyo .rough-node .label text,#mermaid-svg-fq1babFGLkyZHUyo .node .label text,#mermaid-svg-fq1babFGLkyZHUyo .image-shape .label,#mermaid-svg-fq1babFGLkyZHUyo .icon-shape .label{text-anchor:middle;}#mermaid-svg-fq1babFGLkyZHUyo .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-fq1babFGLkyZHUyo .rough-node .label,#mermaid-svg-fq1babFGLkyZHUyo .node .label,#mermaid-svg-fq1babFGLkyZHUyo .image-shape .label,#mermaid-svg-fq1babFGLkyZHUyo .icon-shape .label{text-align:center;}#mermaid-svg-fq1babFGLkyZHUyo .node.clickable{cursor:pointer;}#mermaid-svg-fq1babFGLkyZHUyo .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-fq1babFGLkyZHUyo .arrowheadPath{fill:#333333;}#mermaid-svg-fq1babFGLkyZHUyo .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-fq1babFGLkyZHUyo .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-fq1babFGLkyZHUyo .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-fq1babFGLkyZHUyo .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-fq1babFGLkyZHUyo .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-fq1babFGLkyZHUyo .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-fq1babFGLkyZHUyo .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-fq1babFGLkyZHUyo .cluster text{fill:#333;}#mermaid-svg-fq1babFGLkyZHUyo .cluster span{color:#333;}#mermaid-svg-fq1babFGLkyZHUyo div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-fq1babFGLkyZHUyo .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-fq1babFGLkyZHUyo rect.text{fill:none;stroke-width:0;}#mermaid-svg-fq1babFGLkyZHUyo .icon-shape,#mermaid-svg-fq1babFGLkyZHUyo .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-fq1babFGLkyZHUyo .icon-shape p,#mermaid-svg-fq1babFGLkyZHUyo .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-fq1babFGLkyZHUyo .icon-shape .label rect,#mermaid-svg-fq1babFGLkyZHUyo .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-fq1babFGLkyZHUyo .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-fq1babFGLkyZHUyo .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-fq1babFGLkyZHUyo :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>video.hxx \u7c7b\u5b9a\u4e49<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>odb \u547d\u4ee4\u751f\u6210<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>video-odb.cc \u4e0e hxx<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>video.sql \u5efa\u8868\u8bed\u53e5<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>g&#043;&#043; \u4e00\u8d77\u7f16\u8bd1<\/p>\n<p><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u8fd0\u884c\u671f\u8fde MySQL<\/p>\n<p><\/span><\/p>\n<p align=\"center\">\u56fe 1&#xff1a;\u7c7b\u5b9a\u4e49\u8fdb&#xff0c;\u6301\u4e45\u5316\u4ee3\u7801\u4e0e\u5efa\u8868 SQL \u51fa&#xff0c;\u6700\u540e\u4e00\u8d77\u7f16\u8bd1<\/p>\n<h3>4. \u7c7b\u5c31\u662f\u8868&#xff1a;pragma \u600e\u4e48\u6807\u6ce8<\/h3>\n<p>pragma \u4e0d\u662f\u6ce8\u91ca&#xff0c;\u662f\u7ed9 ODB \u7f16\u8bd1\u5668\u7684\u5143\u6570\u636e\u2014\u2014\u5b83\u51b3\u5b9a\u8868\u540d\u3001\u4e3b\u952e\u3001\u5217\u540d\u3001\u7ea6\u675f\u3002<\/p>\n<p>\u4e00\u4e2a\u6700\u5c0f\u7684\u6301\u4e45\u5316\u7c7b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">db object<\/span><\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Video<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">Video<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> title<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> duration<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">title_<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">duration_<\/span><span class=\"token punctuation\">(<\/span>duration<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">id<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> id_<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> <span class=\"token function\">title<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> title_<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">duration<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> duration_<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">duration<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> v<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> duration_ <span class=\"token operator\">&#061;<\/span> v<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">friend<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">odb<\/span><span class=\"token operator\">:<\/span><span class=\"token base-clause\"><span class=\"token operator\">:<\/span><span class=\"token class-name\">access<\/span><\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8ba9\u751f\u6210\u7684\u4ee3\u7801\u80fd\u8bbf\u95ee\u79c1\u6709\u6210\u5458\u4e0e\u9ed8\u8ba4\u6784\u9020<\/span><br \/>\n    <span class=\"token function\">Video<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">default<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">db id <span class=\"token keyword\">auto<\/span>              <\/span><span class=\"token comment\">\/\/ \u4e3b\u952e&#xff0c;\u7531\u6570\u636e\u5e93\u81ea\u589e<\/span><\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> id_<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">db not_null<\/span><\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string title_<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> duration_<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">db <span class=\"token function\">type<\/span><span class=\"token punctuation\">(<\/span><\/span><span class=\"token string\">&#034;TIMESTAMP&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">)<\/span> not_null<\/span><\/span><br \/>\n    boost<span class=\"token double-colon punctuation\">::<\/span>posix_time<span class=\"token double-colon punctuation\">::<\/span>ptime update_<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e24\u4e2a\u7ec6\u8282\u4e0d\u80fd\u5c11&#xff1a;\u79c1\u6709\u9ed8\u8ba4\u6784\u9020 &#043; friend class odb::access\u3002\u751f\u6210\u4ee3\u7801\u8981\u9760\u9ed8\u8ba4\u6784\u9020\u521b\u5efa\u7a7a\u5bf9\u8c61\u3001\u518d\u76f4\u63a5\u5199\u79c1\u6709\u6210\u5458&#xff0c;\u6ca1\u8fd9\u4e2a\u53cb\u5143\u5c31\u7f16\u4e0d\u8fc7&#xff08;\u5982\u679c\u6210\u5458\u548c\u9ed8\u8ba4\u6784\u9020\u90fd\u662f public&#xff0c;\u53ef\u4ee5\u7701\u6389&#xff09;\u3002<\/p>\n<p>\u5e38\u7528 pragma \u5c31\u8fd9\u51e0\u4e2a&#xff1a;<\/p>\n<table>\n<tr>pragma\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td>db object<\/td>\n<td>\u58f0\u660e\u8fd9\u662f\u6301\u4e45\u5316\u7c7b&#xff0c;\u9ed8\u8ba4\u8868\u540d &#061; \u7c7b\u540d<\/td>\n<\/tr>\n<tr>\n<td>db table(&#034;tbl&#034;)<\/td>\n<td>\u6307\u5b9a\u8868\u540d<\/td>\n<\/tr>\n<tr>\n<td>db id \/ id auto<\/td>\n<td>\u6807\u4e3b\u952e&#xff1b;auto \u8868\u793a\u6570\u636e\u5e93\u81ea\u589e<\/td>\n<\/tr>\n<tr>\n<td>db column(&#034;col&#034;)<\/td>\n<td>\u6307\u5b9a\u5217\u540d&#xff0c;\u9ed8\u8ba4\u7528\u6210\u5458\u540d<\/td>\n<\/tr>\n<tr>\n<td>db not_null \/ unique \/ index<\/td>\n<td>\u9644\u52a0\u7ea6\u675f<\/td>\n<\/tr>\n<tr>\n<td>db type(&#034;VARCHAR(32)&#034;)<\/td>\n<td>\u6307\u5b9a\u6570\u636e\u5e93\u7c7b\u578b<\/td>\n<\/tr>\n<tr>\n<td>db transient<\/td>\n<td>\u8be5\u6210\u5458\u4e0d\u6301\u4e45\u5316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7c7b\u578b\u600e\u4e48\u6620\u5c04\u6709\u4e00\u5957\u9ed8\u8ba4\u89c4\u5219&#xff0c;\u5199 pragma \u4e4b\u524d\u5148\u770b\u4e00\u904d\u8fd9\u5f20\u8868&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261031214036-6ae660547aa2a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p align=\"center\">\u56fe 2&#xff1a;\u5e38\u7528 C&#043;&#043; \u7c7b\u578b\u5230 MySQL \u5217\u7684\u9ed8\u8ba4\u6620\u5c04&#xff0c;NULL \u8bed\u4e49\u51b3\u5b9a\u8981\u4e0d\u8981\u7528 nullable<\/p>\n<p>\u8981\u8868\u8fbe\u300c\u8fd9\u4e00\u5217\u53ef\u4ee5\u4e3a\u7a7a\u300d&#xff0c;\u7528 odb::nullable&lt;T&gt; \u5305\u4e00\u5c42&#xff0c;\u800c\u4e0d\u662f\u7528\u6307\u9488\u6216\u54e8\u5175\u503c&#xff1a;<\/p>\n<p>odb<span class=\"token double-colon punctuation\">::<\/span>nullable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> age_<span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u5bf9\u5e94 INT NULL<\/span><br \/>\nodb<span class=\"token double-colon punctuation\">::<\/span>nullable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">double<\/span><span class=\"token operator\">&gt;<\/span> score_<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u26a0\ufe0f \u7528 boost \u65f6\u95f4\u7c7b\u578b\u5fc5\u987b\u5e26 profile<\/p>\n<p>\u6210\u5458\u91cc\u51fa\u73b0 boost::posix_time::ptime&#xff0c;\u751f\u6210\u547d\u4ee4\u5c31\u5fc5\u987b\u52a0 &#8211;profile boost\/date-time&#xff0c;\u94fe\u63a5\u8fd8\u8981\u52a0 -lodb-boost\u3002\u6f0f\u4e86\u7684\u8868\u73b0\u662f\u751f\u6210\u9636\u6bb5\u76f4\u63a5\u62a5\u89e3\u6790\u5931\u8d25&#xff0c;\u6216\u8005\u65f6\u95f4\u5217\u5efa\u4e0d\u51fa\u6765\u3002<\/p>\n<h3>5. \u589e\u5220\u6539\u67e5&#xff1a;\u6bcf\u6b65\u90fd\u5728\u4e8b\u52a1\u91cc<\/h3>\n<p>ODB \u6709\u4e00\u6761\u94c1\u5f8b&#xff1a;\u6240\u6709\u6570\u636e\u64cd\u4f5c\u90fd\u5fc5\u987b\u5728\u4e8b\u52a1\u5185\u90e8\u5b8c\u6210\u3002\u6ca1\u6709\u4e8b\u52a1&#xff0c;persist \u4e5f\u767d\u5199\u3002<\/p>\n<p>\u5148\u770b\u8fde\u63a5\u3002\u6784\u9020 odb::mysql::database \u7684\u53c2\u6570\u662f\u56fa\u5b9a\u7684\u4e5d\u4e2a&#xff1a;<\/p>\n<p>std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span>connection_factory<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">pool<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">connection_pool_factory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u6700\u591a 3 \u6761\u8fde\u63a5<\/span><\/p>\n<p><span class=\"token keyword\">auto<\/span> db <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_shared<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span>database<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;root&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;123456&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;vod&#034;<\/span><span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ \u7528\u6237\u3001\u5bc6\u7801\u3001\u5e93\u540d<\/span><br \/>\n    <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3306<\/span><span class=\"token punctuation\">,<\/span>            <span class=\"token comment\">\/\/ \u4e3b\u673a\u3001\u7aef\u53e3<\/span><br \/>\n    <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;utf8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                 <span class=\"token comment\">\/\/ socket\u3001\u5b57\u7b26\u96c6\u3001client flags<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>pool<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u7b2c\u4e5d\u4e2a\u53c2\u6570&#xff1a;\u8fde\u63a5\u6c60<\/span><\/p>\n<p>\u589e\u2014\u2014persist \u63d2\u5165\u4e00\u884c&#xff0c;\u4e3b\u952e\u7531\u6570\u636e\u5e93\u5206\u914d\u540e\u56de\u586b\u5230\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token punctuation\">{<\/span><br \/>\n    odb<span class=\"token double-colon punctuation\">::<\/span>transaction <span class=\"token function\">t<\/span><span class=\"token punctuation\">(<\/span>db<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Video <span class=\"token function\">a<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u793a\u4f8b\u5f71\u7247 A&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">120<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> id <span class=\"token operator\">&#061;<\/span> db<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">persist<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ id \u73b0\u5728\u6709\u503c\u4e86<\/span><br \/>\n    t<span class=\"token punctuation\">.<\/span><span class=\"token function\">commit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                            <span class=\"token comment\">\/\/ \u5fd8\u4e86 commit&#xff0c;\u6570\u636e\u4e0d\u843d\u5e93<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u67e5\u2014\u2014query::\u6210\u5458\u540d \u5728\u7f16\u8bd1\u671f\u751f\u6210 SQL&#xff1a;<\/p>\n<p><span class=\"token keyword\">typedef<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>query<span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span> Query<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>result<span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span> Result<span class=\"token punctuation\">;<\/span><\/p>\n<p>odb<span class=\"token double-colon punctuation\">::<\/span>transaction <span class=\"token function\">t<\/span><span class=\"token punctuation\">(<\/span>db<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nResult <span class=\"token function\">r<\/span><span class=\"token punctuation\">(<\/span>db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">query<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Query<span class=\"token double-colon punctuation\">::<\/span>duration_ <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> v <span class=\"token operator\">:<\/span> r<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">id<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">title<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nt<span class=\"token punctuation\">.<\/span><span class=\"token function\">commit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f query:: \u540e\u9762\u8ddf\u7684\u662f\u6210\u5458\u540d&#xff08;duration_&#xff09;&#xff0c;\u4e0d\u662f\u5217\u540d&#xff0c;\u4e5f\u4e0d\u662f\u7c7b\u540d\u3002\u5199\u9519\u7f16\u4e0d\u8fc7\u2014\u2014\u8fd9\u6b63\u662f\u5b83\u6bd4\u624b\u62fc SQL \u5f3a\u7684\u5730\u65b9\u3002<\/p>\n<p>\u6539\u2014\u2014update \u662f\u6309\u4e3b\u952e\u6574\u884c\u8986\u76d6&#xff1a;<\/p>\n<p><span class=\"token keyword\">auto<\/span> row <span class=\"token operator\">&#061;<\/span> db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">query_one<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Query<span class=\"token double-colon punctuation\">::<\/span>id <span class=\"token operator\">&#061;&#061;<\/span> id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>row<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    row<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">duration<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    db<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>row<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u6309\u4e3b\u952e\u8986\u76d6\u6574\u884c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u56e0\u4e3a\u5b83\u662f\u6574\u884c\u8986\u76d6&#xff0c;\u5fc5\u987b\u5148\u53d6\u5230\u5b8c\u6574\u5bf9\u8c61\u518d\u6539\u5b57\u6bb5\u3002\u62ff\u4e00\u4e2a\u53ea\u586b\u4e86 id \u548c duration \u7684\u534a\u6210\u54c1\u53bb update&#xff0c;\u5176\u4ed6\u5217\u4f1a\u88ab\u5199\u6210\u7a7a\u503c\u3002<\/p>\n<p>\u5220\u2014\u2014\u6309\u6761\u4ef6\u6279\u91cf\u5220&#xff0c;\u6bd4\u9010\u4e2a erase \u5c11\u4e00\u5806\u5f80\u8fd4&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">auto<\/span> n <span class=\"token operator\">&#061;<\/span> db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">erase_query<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Query<span class=\"token double-colon punctuation\">::<\/span>duration_ <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#x1f6ab; \u4e8b\u52a1\u5bf9\u8c61\u4e0d\u8981\u8de8\u7ebf\u7a0b<\/p>\n<p>\u4e8b\u52a1\u5bf9\u8c61\u6301\u6709\u8fde\u63a5\u72b6\u6001&#xff0c;\u8de8\u7ebf\u7a0b\u4f7f\u7528\u4f1a\u8ba9\u8fde\u63a5\u9519\u4e71\u3002\u4e8b\u52a1\u4e0e\u5b83\u6d3e\u751f\u7684 db \u53ea\u5728\u5f53\u524d\u4f5c\u7528\u57df\u5185\u7528\u5b8c\u5c31\u7ed3\u675f&#xff1b;\u9700\u8981\u5e76\u53d1\u5c31\u5f00\u591a\u4e2a\u4e8b\u52a1&#xff0c;\u522b\u5171\u4eab\u4e00\u4e2a\u3002<\/p>\n<h3>6. \u67e5\u8be2\u4e0e\u5c01\u88c5&#xff1a;\u8868\u8fbe\u5f0f\u3001\u89c6\u56fe\u3001\u5de5\u5382<\/h3>\n<p>\u8868\u8fbe\u5f0f\u8d1f\u8d23\u5355\u8868\u6761\u4ef6&#xff0c;\u89c6\u56fe\u8d1f\u8d23\u591a\u8868\u8fde\u63a5&#xff0c;\u5de5\u5382\u8d1f\u8d23\u628a\u8fd9\u4e9b\u80fd\u529b\u88c5\u914d\u6210\u53ef\u590d\u7528\u7684\u4e00\u5c42\u3002<\/p>\n<p>\u5355\u8868\u6761\u4ef6\u7528\u8868\u8fbe\u5f0f\u6700\u5b89\u5168&#xff0c;\u6392\u5e8f\u4e0e\u5206\u9875\u8fd9\u7c7b\u5b50\u53e5\u5219\u76f4\u63a5\u62fc\u5b57\u7b26\u4e32\u66f4\u987a\u624b\u2014\u2014\u4e24\u79cd\u98ce\u683c\u53ef\u4ee5\u6df7\u7528&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u8868\u8fbe\u5f0f&#xff1a;\u7f16\u8bd1\u671f\u68c0\u67e5\u5b57\u6bb5\u540d<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> r1 <span class=\"token operator\">&#061;<\/span> db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">query<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Query<span class=\"token double-colon punctuation\">::<\/span>duration_ <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">&amp;&amp;<\/span> Query<span class=\"token double-colon punctuation\">::<\/span>title_ <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b57\u7b26\u4e32\u6761\u4ef6&#xff1a;\u6392\u5e8f &#043; LIMIT \u8fd9\u7c7b\u5b50\u53e5\u62fc\u8d77\u6765\u66f4\u76f4\u63a5<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>string cond <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;order by duration_ desc limit &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncond <span class=\"token operator\">&#043;&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">to_string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> r2 <span class=\"token operator\">&#061;<\/span> db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">query<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>Video<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>cond<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u591a\u8868\u8fde\u63a5\u7528 #pragma db view&#xff0c;\u5b83\u4e0d\u5efa\u8868&#xff0c;\u53ea\u662f\u67e5\u8be2\u7ed3\u679c\u7684\u8f7d\u4f53&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">db view <span class=\"token function\">object<\/span><span class=\"token punctuation\">(<\/span>Classes<span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n                <span class=\"token expression\"><span class=\"token function\">object<\/span><span class=\"token punctuation\">(<\/span>Student <span class=\"token operator\">:<\/span> Student<span class=\"token double-colon punctuation\">::<\/span>classes_id_ <span class=\"token operator\">&#061;&#061;<\/span> Classes<span class=\"token double-colon punctuation\">::<\/span>id_<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ClassesStudent<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>shared_ptr<span class=\"token operator\">&lt;<\/span>Student<span class=\"token operator\">&gt;<\/span> student<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>shared_ptr<span class=\"token operator\">&lt;<\/span>Classes<span class=\"token operator\">&gt;<\/span> classes<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fde\u63a5\u6761\u4ef6\u76f4\u63a5\u5199\u5728 pragma \u91cc&#xff0c;\u7b49\u4ef7\u4e8e SQL \u7684 ON&#xff1b;\u67e5\u8be2\u65f6\u6309\u89c6\u56fe\u6210\u5458\u8bbf\u95ee\u4e24\u5f20\u8868\u7684\u5b8c\u6574\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">typedef<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>query<span class=\"token operator\">&lt;<\/span>ClassesStudent<span class=\"token operator\">&gt;<\/span> Query<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>result<span class=\"token operator\">&lt;<\/span>ClassesStudent<span class=\"token operator\">&gt;<\/span> Result<span class=\"token punctuation\">;<\/span><br \/>\nResult <span class=\"token function\">res<\/span><span class=\"token punctuation\">(<\/span>db<span class=\"token operator\">-&gt;<\/span><span class=\"token generic-function\"><span class=\"token function\">query<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>ClassesStudent<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>Query<span class=\"token double-colon punctuation\">::<\/span>Classes<span class=\"token double-colon punctuation\">::<\/span>name_ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\u4e00\u5e74\u7ea7\u4e00\u73ed&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> row <span class=\"token operator\">:<\/span> res<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>row<span class=\"token punctuation\">.<\/span>student<span class=\"token punctuation\">)<\/span> std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> row<span class=\"token punctuation\">.<\/span>student<span class=\"token operator\">-&gt;<\/span>name_ <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6700\u540e\u662f\u5c01\u88c5\u3002ODB \u7684\u589e\u5220\u6539\u67e5\u672c\u8eab\u5df2\u7ecf\u5f88\u5b8c\u6574&#xff0c;\u6240\u4ee5\u4e8c\u6b21\u5c01\u88c5\u53ea\u505a\u4e09\u4ef6\u4e8b&#xff1a;\u6536\u914d\u7f6e\u3001\u9020\u53e5\u67c4\u3001\u5206 DAO\u3002<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Settings<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string host <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">int<\/span> port <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3306<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string user <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;root&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string password<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string database<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string charset <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;utf8&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>size_t pool_size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>std<span class=\"token double-colon punctuation\">::<\/span>shared_ptr<span class=\"token operator\">&lt;<\/span>odb<span class=\"token double-colon punctuation\">::<\/span>database<span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">DBFactory<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">createMySql<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> Settings<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span>connection_factory<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">pool<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token keyword\">new<\/span> odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">connection_pool_factory<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>pool_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_shared<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>odb<span class=\"token double-colon punctuation\">::<\/span>mysql<span class=\"token double-colon punctuation\">::<\/span>database<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span><br \/>\n        s<span class=\"token punctuation\">.<\/span>user<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>password<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>database<span class=\"token punctuation\">,<\/span><br \/>\n        s<span class=\"token punctuation\">.<\/span>host<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>port<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>charset<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>pool<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e1a\u52a1\u4fa7\u5c31\u4e00\u53e5\u8bdd&#xff1a;<\/p>\n<p><span class=\"token keyword\">auto<\/span> db <span class=\"token operator\">&#061;<\/span> dbx<span class=\"token double-colon punctuation\">::<\/span><span class=\"token class-name\">DBFactory<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">createMySql<\/span><span class=\"token punctuation\">(<\/span>settings<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2705 \u5c01\u88c5\u5230\u300c\u5de5\u5382 &#043; DAO\u300d\u5c31\u591f<\/p>\n<p>\u518d\u5f80\u4e0a\u5305\u4e00\u5c42\u300c\u901a\u7528 Repository\u300d\u6536\u76ca\u5f88\u4f4e&#xff1a;ODB \u7684\u67e5\u8be2\u8868\u8fbe\u5f0f\u672c\u6765\u5c31\u662f\u7c7b\u578b\u5b89\u5168\u7684&#xff0c;\u5305\u4e00\u5c42\u53cd\u800c\u628a\u7c7b\u578b\u4fe1\u606f\u85cf\u8d77\u6765\u3002\u6309\u8868\u5206 DAO&#xff08;\u6bcf\u4e2a DAO \u5185\u90e8\u7edf\u4e00\u5904\u7406\u4e8b\u52a1\u4e0e\u5f02\u5e38&#xff09;\u662f\u6700\u7701\u5fc3\u7684\u7c92\u5ea6\u3002<\/p>\n<h3>7. \u8e29\u5751\u4e0e\u5c0f\u7ed3<\/h3>\n<p>\u5751\u96c6\u4e2d\u5728\u4e24\u5904&#xff1a;\u6784\u5efa\u94fe\u8def\u4e0a\u7684\u751f\u6210\u7269&#xff0c;\u4ee5\u53ca pragma \u4e0e\u5b9e\u9645\u8868\u7684\u5bf9\u9f50\u3002<\/p>\n<table>\n<tr>\u73b0\u8c61\u6839\u56e0\u4fee\u6cd5<\/tr>\n<tbody>\n<tr>\n<td>libodb-2.5.0-b.25.so: cannot open shared object file<\/td>\n<td>\u8fd0\u884c\u5e93\u5728\/usr\/local\/lib&#xff0c;\u94fe\u63a5\u5668\u6ca1\u641c\u5230<\/td>\n<td>sudo ldconfig \u6216\u8bbe LD_LIBRARY_PATH<\/td>\n<\/tr>\n<tr>\n<td>bash: \/usr\/bin\/odb: No such file or directory<\/td>\n<td>odb \u5728 \/usr\/local\/bin&#xff0c;PATH \u6ca1\u542b<\/td>\n<td>\u628a\u8be5\u76ee\u5f55\u52a0\u8fdb PATH<\/td>\n<\/tr>\n<tr>\n<td>\u4e00\u5806undefined reference to &#8230;odb&#8230;<\/td>\n<td>\u751f\u6210\u7684-odb.cc \u6ca1\u53c2\u4e0e\u7f16\u8bd1<\/td>\n<td>\u7f16\u8bd1\u65f6\u5e26\u4e0a\u751f\u6210\u7269<\/td>\n<\/tr>\n<tr>\n<td>db.query&lt;&gt;() \u94fe\u63a5\u671f\u62a5\u672a\u5b9a\u4e49<\/td>\n<td>\u751f\u6210\u65f6\u6f0f\u4e86&#8211;generate-query<\/td>\n<td>\u91cd\u65b0\u7528\u5b8c\u6574\u53c2\u6570\u751f\u6210<\/td>\n<\/tr>\n<tr>\n<td>\u65f6\u95f4\u5b57\u6bb5\u89e3\u6790\u5931\u8d25<\/td>\n<td>\u7f3a&#8211;profile boost\/date-time<\/td>\n<td>\u8865 profile&#xff0c;\u5e76\u94fe-lodb-boost<\/td>\n<\/tr>\n<tr>\n<td>\u8fd0\u884c\u62a5\u300c\u8868\u4e0d\u5b58\u5728\u300d<\/td>\n<td>\u6ca1\u5bfc\u5165\u751f\u6210\u7684.sql<\/td>\n<td>mysql -u root -p vod &lt; video.sql<\/td>\n<\/tr>\n<tr>\n<td>update() \u628a\u5176\u4ed6\u5217\u5199\u7a7a\u4e86<\/td>\n<td>\u62ff\u534a\u6210\u54c1\u5bf9\u8c61\u53bb\u6574\u884c\u8986\u76d6<\/td>\n<td>\u5148query_one \u53d6\u5168\u5bf9\u8c61\u518d\u6539<\/td>\n<\/tr>\n<tr>\n<td>\u9ad8\u5e76\u53d1\u4e0b\u8fde\u63a5\u72b6\u6001\u9519\u4e71<\/td>\n<td>\u4e8b\u52a1\u5bf9\u8c61\u8de8\u7ebf\u7a0b<\/td>\n<td>\u4e8b\u52a1\u53ea\u5728\u672c\u4f5c\u7528\u57df\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4dd; \u5c0f\u7ed3<\/p>\n<p>\u2460 \u7c7b\u5b9a\u4e49\u5c31\u662f\u8868\u5b9a\u4e49&#xff1a;\u5b57\u6bb5\u52a0 pragma&#xff0c;\u5de5\u5177\u751f\u6210\u6301\u4e45\u5316\u4ee3\u7801\u4e0e\u5efa\u8868 SQL\u3002<\/p>\n<p>\u2461 \u6ca1\u6709\u4e8b\u52a1\u5c31\u6ca1\u6709\u64cd\u4f5c&#xff1a;\u589e\u5220\u6539\u67e5\u5168\u90e8\u8981\u5728 &#096;db-&gt;begin()&#096; \u5f00\u7684\u4e8b\u52a1\u91cc\u505a\u3002<\/p>\n<p>\u2462 \u751f\u6210\u7684 -odb.cc \u5fc5\u987b\u8fdb\u7f16\u8bd1&#xff0c;\u5426\u5219\u94fe\u63a5\u671f\u4e00\u5806\u672a\u5b9a\u4e49\u5f15\u7528\u3002<\/p>\n<p>\u2463 update \u662f\u6574\u884c\u8986\u76d6&#xff1a;\u5148\u53d6\u5168\u5bf9\u8c61\u518d\u6539&#xff0c;\u522b\u62ff\u534a\u6210\u54c1\u66f4\u65b0\u3002<\/p>\n<p>\u2464 \u5355\u8868\u7528\u8868\u8fbe\u5f0f\u3001\u591a\u8868\u7528\u89c6\u56fe&#xff0c;\u5de5\u5382\u6536\u8fde\u63a5\u6c60&#xff0c;DAO \u6536\u4e8b\u52a1\u4e0e\u5f02\u5e38\u3002<\/p>\n<p>&#x1f4e6; \u9879\u76ee\u6e90\u7801<\/p>\n<p>\u672c\u6587\u793a\u4f8b\u6240\u5728\u7684 C&#043;&#043; \u5fae\u670d\u52a1\u811a\u624b\u67b6&#xff08;\u70b9\u64ad\u7cfb\u7edf&#xff09;&#xff1a;https:\/\/github.com\/syagain-zsx\/cpp-microservice-scaffold-vod-system<\/p>\n<p>&#x1f51c; \u4e0b\u4e00\u7bc7<\/p>\n<p>\u300aElasticsearch \u5ba2\u6237\u7aef\u4e0e\u4e8c\u6b21\u5c01\u88c5\u300b\u2014\u2014\u7cbe\u786e\u67e5\u8be2\u4ea4\u7ed9 MySQL&#xff0c;\u5168\u6587\u68c0\u7d22\u4ea4\u7ed9\u641c\u7d22\u5f15\u64ce\u3002\u5173\u6ce8\u4e13\u680f\u4e0d\u8ff7\u8def\u3002<\/p>\n<p>&#x1f517; \u53c2\u8003<\/p>\n<p>[1] ODB \u5b98\u65b9\u624b\u518c&#xff1a;ODB Manual<\/p>\n<p>[2] ODB \u9879\u76ee\u4e3b\u9875&#xff1a;codesynthesis.com\/odb<\/p>\n<p>[3] build2 \u5de5\u5177\u94fe&#xff1a;build2.org<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#x1f4da; \u7cfb\u5217&#xff1a;C \u5de5\u7a0b\u5b9e\u8df5 \u7b2c 17 \u7bc7 \u23f1 \u9605\u8bfb\u7ea6 15 \u5206\u949f  &#x1f4cc; \u4e00\u53e5\u8bdd\u603b\u7ed3 \u7f13\u5b58\u6321\u4e0d\u4f4f\u7684\u90a3\u90e8\u5206\u7ec8\u7a76\u8981\u843d\u5230\u5173\u7cfb\u5e93&#xff0c;\u800c\u5728 C \u91cc\u624b\u62fc SQL \u662f\u5178\u578b\u7684\u300c\u5199\u4e09\u904d\u3001\u6539\u4e00\u5904\u3001\u6f0f\u4e24\u5904\u300d\u3002\u672c\u6587\u7528 ODB \u628a\u8fd9\u5c42\u6536\u6389&#xff1a;C \u7c7b\u5c31\u662f\u8868\u5b9a\u4e49&#xff0c;\u4e00\u6761 odb \u547d\u4ee4\u5728\u7f16\u8bd1\u671f\u751f\u6210\u5168\u90e8\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e1a\u52a1\u4fa7\u53ea\u9762\u5bf9\u5bf9\u8c61&#xff1b;\u518d\u8bb2\u6e05\u4e8b\u52a1\u94c1\u5f8b\u3001\u67e5\u8be2\u8868\u8fbe\u5f0f\u4e0e\u591a\u8868\u89c6\u56fe&#xff0c;\u6700\u540e\u7528\u300c\u914d\u7f6e  \u5de5\u5382  <\/p>\n","protected":false},"author":2,"featured_media":120718,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11820,13778,868,55,114,100],"topic":[],"class_list":["post-120720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-atomgit","tag-13778","tag-868","tag-c","tag-mysql","tag-100"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/120720.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"&#x1f4da; \u7cfb\u5217&#xff1a;C \u5de5\u7a0b\u5b9e\u8df5 \u7b2c 17 \u7bc7 \u23f1 \u9605\u8bfb\u7ea6 15 \u5206\u949f &#x1f4cc; \u4e00\u53e5\u8bdd\u603b\u7ed3 \u7f13\u5b58\u6321\u4e0d\u4f4f\u7684\u90a3\u90e8\u5206\u7ec8\u7a76\u8981\u843d\u5230\u5173\u7cfb\u5e93&#xff0c;\u800c\u5728 C \u91cc\u624b\u62fc SQL \u662f\u5178\u578b\u7684\u300c\u5199\u4e09\u904d\u3001\u6539\u4e00\u5904\u3001\u6f0f\u4e24\u5904\u300d\u3002\u672c\u6587\u7528 ODB \u628a\u8fd9\u5c42\u6536\u6389&#xff1a;C \u7c7b\u5c31\u662f\u8868\u5b9a\u4e49&#xff0c;\u4e00\u6761 odb \u547d\u4ee4\u5728\u7f16\u8bd1\u671f\u751f\u6210\u5168\u90e8\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e1a\u52a1\u4fa7\u53ea\u9762\u5bf9\u5bf9\u8c61&#xff1b;\u518d\u8bb2\u6e05\u4e8b\u52a1\u94c1\u5f8b\u3001\u67e5\u8be2\u8868\u8fbe\u5f0f\u4e0e\u591a\u8868\u89c6\u56fe&#xff0c;\u6700\u540e\u7528\u300c\u914d\u7f6e \u5de5\u5382\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/120720.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-31T21:40:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261031214036-6ae6605425eeb.gif\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/120720.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/120720.html\",\"name\":\"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-10-31T21:40:37+00:00\",\"dateModified\":\"2026-10-31T21:40:37+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/120720.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/120720.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/120720.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/120720.html","og_locale":"zh_CN","og_type":"article","og_title":"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"&#x1f4da; \u7cfb\u5217&#xff1a;C \u5de5\u7a0b\u5b9e\u8df5 \u7b2c 17 \u7bc7 \u23f1 \u9605\u8bfb\u7ea6 15 \u5206\u949f &#x1f4cc; \u4e00\u53e5\u8bdd\u603b\u7ed3 \u7f13\u5b58\u6321\u4e0d\u4f4f\u7684\u90a3\u90e8\u5206\u7ec8\u7a76\u8981\u843d\u5230\u5173\u7cfb\u5e93&#xff0c;\u800c\u5728 C \u91cc\u624b\u62fc SQL \u662f\u5178\u578b\u7684\u300c\u5199\u4e09\u904d\u3001\u6539\u4e00\u5904\u3001\u6f0f\u4e24\u5904\u300d\u3002\u672c\u6587\u7528 ODB \u628a\u8fd9\u5c42\u6536\u6389&#xff1a;C \u7c7b\u5c31\u662f\u8868\u5b9a\u4e49&#xff0c;\u4e00\u6761 odb \u547d\u4ee4\u5728\u7f16\u8bd1\u671f\u751f\u6210\u5168\u90e8\u6301\u4e45\u5316\u4ee3\u7801&#xff0c;\u4e1a\u52a1\u4fa7\u53ea\u9762\u5bf9\u5bf9\u8c61&#xff1b;\u518d\u8bb2\u6e05\u4e8b\u52a1\u94c1\u5f8b\u3001\u67e5\u8be2\u8868\u8fbe\u5f0f\u4e0e\u591a\u8868\u89c6\u56fe&#xff0c;\u6700\u540e\u7528\u300c\u914d\u7f6e \u5de5\u5382","og_url":"https:\/\/www.wsisp.com\/helps\/120720.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-10-31T21:40:37+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261031214036-6ae6605425eeb.gif"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"7 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/120720.html","url":"https:\/\/www.wsisp.com\/helps\/120720.html","name":"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-10-31T21:40:37+00:00","dateModified":"2026-10-31T21:40:37+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/120720.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/120720.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/120720.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"ODB \u4e0e MySQL\uff1aC++ \u91cc\u7684 ORM \u5b9e\u8df5\uff08\u7c7b\u5373\u8868\u3001\u4e8b\u52a1\u94c1\u5f8b\u4e0e\u67e5\u8be2\u5c01\u88c5\uff09"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/120720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=120720"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/120720\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/120718"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=120720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=120720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=120720"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=120720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}