{"id":52341,"date":"2025-08-11T13:24:51","date_gmt":"2025-08-11T05:24:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/52341.html"},"modified":"2025-08-11T13:24:51","modified_gmt":"2025-08-11T05:24:51","slug":"java%e6%95%b0%e6%8d%ae%e5%ba%93%e7%bc%96%e7%a8%8b%e4%b9%8b%e3%80%90jdbc%e6%95%b0%e6%8d%ae%e5%ba%93%e4%be%8b%e7%a8%8b%e3%80%91%e3%80%90%e6%a8%a1%e6%8b%9f%e9%93%b6%e8%a1%8c%e5%ad%98%e5%8f%96%e6%ac%be","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/52341.html","title":{"rendered":"Java\u6570\u636e\u5e93\u7f16\u7a0b\u4e4b\u3010JDBC\u6570\u636e\u5e93\u4f8b\u7a0b\u3011\u3010\u6a21\u62df\u94f6\u884c\u5b58\u53d6\u6b3e\u4f8b\u7a0b\u3011\u3010\u4e03\u3011"},"content":{"rendered":"

15.7 \u6a21\u62df\u94f6\u884c\u5b58\u53d6\u6b3e\u4f8b\u7a0b<\/p>\n

\u3010\u4f8b\u7a0b15-12\u3011\u6a21\u62df\u94f6\u884c\u5b58\u53d6\u6b3e\u4f8b\u7a0b
\n\u8fd9\u662f\u4e00\u4e2a\u6a21\u62df\u94f6\u884c\u5b58\u53d6\u6b3e\u64cd\u4f5c\u7684\u6570\u636e\u5e93\u793a\u4f8b\u7a0b\u5e8f，\u8d26\u6237\u4f59\u989d\u8868\u548c\u8d26\u6237\u660e\u7ec6\u8868\u7684\u8868\u7ed3\u6784\u524d\u6587\u5df2\u6709\u4ecb\u7ecd，\u4e0b\u9762\u662f\u8be6\u7ec6\u7684\u7a0b\u5e8f\u6e90\u7801\u3002<\/p>\n

15.7.1 \u521b\u5efa\u6570\u636e\u5e93\u8868\u4f8b\u7a0b<\/p>\n

\u5728\u535a\u5ba2：Java\u6570\u636e\u5e93\u7f16\u7a0b\u4e4b\u3010\u6982\u8ff0\u3011\u3010SQL\u8bed\u8a00\u3011\u3010\u4e00\u3011 \u4e2d\u6211\u4eec\u66fe\u5b9a\u4e49\u4e86\u4e00\u4e2a\u521b\u5efa\u6570\u636e\u5e93\u811a\u672cbankDB_CrtDB.sql\u3002 \u8bf7\u53c2\u89c1 \u3010\u4f8b\u7a0b15-1\u3011 \u521b\u5efaBankDB\u6570\u636e\u5e93\u7684SQL\u811a\u672c<\/p>\n

\u5728\u6570\u636e\u5e93\u7684DBMS\u73af\u5883\u4e2d\u6267\u884c\u4e00\u4e0b\u811a\u672cbankDB_CrtDB.sql，\u5c31\u4f1a\u5728\u8def\u5f84\u201cD:\\\\DB\u201d\u4e0b\u751f\u6210\u6570\u636e\u5e93\u3002\u4f46\u662f\u6211\u4eec\u4eca\u5929\u8981\u6f14\u793a\u7684\u662fJava\u7a0b\u5e8f\u8c03\u7528\u811a\u672c\u751f\u6210\u6570\u636e\u5e93\u3002\u5728\u7a0b\u5e8f\u4e2d\u811a\u672c\u8981\u4f5c\u4e3a\u5b57\u7b26\u4e32\u5bfc\u5165，\u8981\u7a0d\u4f5c\u5904\u7406\u3002\u4e0b\u9762\u662f\u521b\u5efa\u6570\u636e\u5e93\u8868\u7684\u6f14\u793a\u7a0b\u5e8f\u5171\u6709\u4e8c\u4e2a\u7c7b，\u7c7bDbOperate\u7528\u4e8e\u7ba1\u7406SQL\u811a\u672c\u3001\u6570\u636e\u5e93\u540d，\u4ee5\u53ca\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u7a0b\u5e8f\u8c03\u7528；\u7c7bDBConnectManager.java\u8d1f\u8d23\u6570\u636e\u5e93\u521b\u5efa\u3001\u8fde\u63a5\u68c0\u6d4b\u3001\u9519\u8bef\u4fe1\u606f\u5904\u7406\u7b49\u529f\u80fd；
\n\u7c7bDBConnectManager.java\u4ee3\u7801\u5982\u4e0b：<\/p>\n

package bank;<\/span> \/\/\u7a0b\u5e8fDBConnectManager.java\u5f00\u59cb<\/span>
\nimport java.<\/span>sql.<\/span>Connection;<\/span>
\nimport java.<\/span>sql.<\/span>DriverManager;<\/span>
\nimport java.<\/span>sql.<\/span>SQLException;<\/span>
\nimport java.<\/span>sql.<\/span>SQLWarning;<\/span>
\nimport java.<\/span>sql.<\/span>Statement;<\/span>
\npublic<\/span> class<\/span> DBConnectManager<\/span> {<\/span>
\nprivate<\/span> static<\/span> Connection con =<\/span> null ;<\/span>
\n\/***\u7531\u4e09\u90e8\u5206\u4e00\u8d77\u5b8c\u6210\u6570\u636e\u5e93\u7684\u8fde\u63a5： driver \u662f\u6570\u636e\u5e93\u9a71\u52a8；
\n * dbProtocol\u6307\u5b9a\u6570\u636e\u5e93\u534f\u8bae\u7c7b\u578b；
\n * dbName\u5728\u5d4c\u5165\u6a21\u5f0f\u4e2d\u662f\u5e26\u8def\u5f84\u7684\u6570\u636e\u5e93\u540d；\u6539\u4e3a\u53c2\u6570\u4f20\u5165\u3002
\n * \u7531dbProtocol\u548cdbName\u7ec4\u5408\u6210\u8bbf\u95ee\u6570\u636e\u5e93\u7684URL * ***\/<\/span>
\nprivate<\/span> static<\/span> final String driver =<\/span> "org.apache.derby.jdbc.EmbeddedDriver"<\/span> ;<\/span>
\nprivate<\/span> static<\/span> final String dbProtocol =<\/span> "jdbc:derby:"<\/span> ;<\/span> <\/p>\n

\/\/\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5<\/span>
\npublic<\/span> static<\/span> Connection GetConnection<\/span>(<\/span> String dbName )<\/span> throws SQLException {<\/span>
\nif<\/span> (<\/span> con !=<\/span> null &&<\/span> !<\/span>con.<\/span>isClosed<\/span>(<\/span>)<\/span> )<\/span> return<\/span> con;<\/span> \/\/\u8fde\u63a5\u4e0d\u4e3a\u7a7a,\u4e14\u6ca1\u5173\u95ed.<\/span>
\nelse<\/span> if<\/span> (<\/span>connectDb<\/span>(<\/span>dbName)<\/span>)<\/span> {<\/span> return<\/span> con;<\/span> }<\/span> \/\/\u5c1d\u8bd5\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5<\/span>
\nelse<\/span> {<\/span>
\nSystem.<\/span>err.<\/span>println<\/span>(<\/span>"\u6570\u636e\u5e93\u4e0d\u5b58\u5728！\u6570\u636e\u8fde\u63a5\u5931\u8d25\u3002 "<\/span>)<\/span>;<\/span>
\nreturn<\/span> con;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\/\/\u6839\u636e\u5efa\u8868\u53c2\u6570,\u65b0\u5efa\u6570\u636e\u5e93\u8868<\/span>
\npublic<\/span> static<\/span> void<\/span> CreateDbTable<\/span>(<\/span>String dbName,<\/span> String createTableSQL)<\/span>
\n{<\/span>
\n\/***\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5url： "create=true"\u8868\u793a\u5982\u679c\u6570\u636e\u5e93\u4e0d\u5b58\u5728，\u5c31\u5efa\u7acb\u6570\u636e\u5e93 ***\/<\/span>
\nString url =<\/span> dbProtocol +<\/span> dbName +<\/span> ";create=true"<\/span>;<\/span>
\ntry<\/span> {<\/span>
\nif<\/span> (<\/span>con==<\/span>null)<\/span> {<\/span> \/\/\u5982\u679c\u6570\u636e\u5e93\u8fde\u63a5\u4e0d\u5b58\u5728，\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5<\/span>
\nClass.<\/span>forName<\/span>(<\/span>driver)<\/span> ;<\/span> \/*\u52a0\u8f7d\u6570\u636e\u5e93\u9a71\u52a8*\/<\/span>
\n\/\/\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5<\/span>
\ncon =<\/span> DriverManager.<\/span>getConnection<\/span>(<\/span>url)<\/span>;<\/span>
\n}<\/span>
\nStatement stmt =<\/span> con.<\/span>createStatement<\/span>(<\/span>)<\/span>;<\/span>
\nstmt.<\/span>executeUpdate<\/span>(<\/span>createTableSQL)<\/span> ;<\/span>
\nstmt.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span>catch<\/span> (<\/span>SQLException se)<\/span> {<\/span>
\nPrintSQLException<\/span>(<\/span>se)<\/span> ;<\/span>
\n}<\/span>catch<\/span>(<\/span>ClassNotFoundException e)<\/span>{<\/span>
\nSystem.<\/span>err.<\/span>println<\/span>(<\/span>"JDBC\u9a71\u52a8："<\/span> +<\/span> driver +<\/span> " \u4e0d\u5728CLASSPATH\u8def\u5f84\u91cc"<\/span>)<\/span> ;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\/\/\u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5，\u6210\u529f\u8fd4\u56detrue，\u5426\u5219\u8fd4\u56defalse\u3002<\/span>
\npublic<\/span> static<\/span> boolean connectDb<\/span>(<\/span>String dbName)<\/span> {<\/span>
\nString url =<\/span> dbProtocol +<\/span> dbName;<\/span>
\nboolean rnflg =<\/span> false<\/span> ;<\/span>
\ntry<\/span>{<\/span>
\nClass.<\/span>forName<\/span>(<\/span>driver)<\/span> ;<\/span>
\ncon =<\/span> DriverManager.<\/span>getConnection<\/span>(<\/span> url )<\/span>;<\/span>
\n SQLWarning swarn =<\/span> con.<\/span>getWarnings<\/span>(<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>swarn !=<\/span> null)<\/span> PrintSQLWarning<\/span>(<\/span>swarn)<\/span>;<\/span>
\n rnflg =<\/span> true<\/span> ;<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException se)<\/span> {<\/span>
\nPrintSQLException<\/span>(<\/span>se)<\/span> ;<\/span>
\n}<\/span>catch<\/span>(<\/span>ClassNotFoundException e)<\/span>{<\/span>
\nSystem.<\/span>err.<\/span>println<\/span>(<\/span>"JDBC\u9a71\u52a8："<\/span> +<\/span> driver +<\/span> " \u4e0d\u5728CLASSPATH\u8def\u5f84\u91cc"<\/span>)<\/span> ;<\/span>}<\/span>catch<\/span>(<\/span>Exception e)<\/span>{<\/span> }<\/span> \/\/ Do nothing, as DB does not (yet) exist<\/span>
\nreturn<\/span>(<\/span>rnflg)<\/span> ;<\/span>
\n}<\/span>
\n\/***\u6253\u5370SQLException\u5f02\u5e38\u51fa\u9519\u4fe1\u606f\u7684\u65b9\u6cd5***\/<\/span>
\npublic<\/span> static<\/span> void<\/span> PrintSQLException<\/span>(<\/span>SQLException se)<\/span> {<\/span>
\nwhile<\/span>(<\/span>se !=<\/span> null)<\/span> {<\/span>
\nSystem.<\/span>out.<\/span>print<\/span>(<\/span>"SQLException: State: "<\/span> +<\/span> se.<\/span>getSQLState<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>" Severity: "<\/span> +<\/span> se.<\/span>getErrorCode<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>se.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nse =<\/span> se.<\/span>getNextException<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\n\/***\u6253\u5370SQLWarning\u8b66\u544a\u4fe1\u606f\u7684\u65b9\u6cd5***\/<\/span>
\npublic<\/span> static<\/span> void<\/span> PrintSQLWarning<\/span>(<\/span>SQLWarning sw)<\/span> {<\/span>
\n while<\/span>(<\/span>sw !=<\/span> null)<\/span> {<\/span>
\n System.<\/span>out.<\/span>print<\/span>(<\/span>"SQLWarning: State="<\/span> +<\/span> sw.<\/span>getSQLState<\/span>(<\/span>)<\/span>)<\/span> ;<\/span>
\n System.<\/span>out.<\/span>println<\/span>(<\/span>" Severity = "<\/span> +<\/span> sw.<\/span>getErrorCode<\/span>(<\/span>)<\/span>)<\/span> ;<\/span>
\n System.<\/span>out.<\/span>println<\/span>(<\/span>sw.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n sw =<\/span> sw.<\/span>getNextWarning<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span>
\n}<\/span> \/\/\u7a0b\u5e8fDBConnectManager.java\u7ed3\u675f\u3002<\/span><\/p>\n

\u7c7bDbOperate.java\u4ee3\u7801\u5982\u4e0b：<\/p>\n

package bank;<\/span> \/\/\u7a0b\u5e8fDbOperate.java\u5f00\u59cb<\/span>
\nimport java.<\/span>sql.<\/span>Connection;<\/span>
\nimport java.<\/span>sql.<\/span>ResultSet;<\/span>
\nimport java.<\/span>sql.<\/span>SQLException;<\/span>
\nimport java.<\/span>sql.<\/span>SQLWarning;<\/span>
\nimport java.<\/span>sql.<\/span>Statement;<\/span><\/p>\n

public<\/span> class<\/span> DbOperate<\/span> {<\/span>
\n\/\/\u7edd\u5bf9\u8def\u5f84\u7684\u6570\u636e\u5e93\u540d，\u5c06\u5728\u6307\u5b9a\u7684\u8def\u5f84\u521b\u5efa\u6570\u636e\u5e93\u3002\u5982\u7528\u76f8\u5bf9\u8def\u5f84\u5219\u6570\u636e\u5e93\u521b\u5efa\u5728\u5de5\u4f5c\u76ee\u5f55\u4e0b<\/span>
\nprivate<\/span> static<\/span> final String dbName =<\/span> "D:\\\\\\\\DB\\\\\\\\BankDB"<\/span>;<\/span>
\n\/***\u521b\u5efa\u94f6\u884c\u8d26\u6237\u4f59\u989d\u8868bank.actsBalance\u7684SQL\u8bed\u53e5\u811a\u672c***\/<\/span>
\nprivate<\/span> static<\/span> final String CrtActsBalanceTableSQL =<\/span>
\n"CREATE TABLE bank.actsBalance ( "<\/span> +<\/span>
\n"cardNumber VARCHAR(19) PRIMARY KEY,"<\/span> +<\/span>
\n"actBalance DECIMAL(10,2) check(actBalance>=0),"<\/span> +<\/span>
\n"tradeDate TIMESTAMP )"<\/span> ;<\/span>
\n\/***\u521b\u5efa\u94f6\u884c\u8d26\u6237\u660e\u7ec6\u8868bank.actsDetail\u7684SQL\u8bed\u53e5\u811a\u672c***\/<\/span>
\nprivate<\/span> static<\/span> final String CrtActsDetailTableSQL =<\/span>
\n"CREATE TABLE bank.actsDetail ( "<\/span> +<\/span>
\n"cardNumber VARCHAR(19) NOT NULL,"<\/span> +<\/span>
\n"deposit DECIMAL(10,2) check(deposit>0),"<\/span> +<\/span>
\n"withdraw DECIMAL(10,2) check(withdraw>0),"<\/span> +<\/span>
\n"tradeDate TIMESTAMP, "<\/span> +<\/span>
\n"FOREIGN KEY (cardNumber) REFERENCES bank.actsBalance(cardNumber) )"<\/span> ;<\/span>
\n\/***\u63d2\u5165\u6f14\u793a\u8d26\u6237\u6570\u636e***\/<\/span>
\nprivate<\/span> static<\/span> final String InitTableSQL =<\/span>
\n"INSERT INTO bank.actsBalance(cardNumber, actBalance, tradeDate) "<\/span> +<\/span>
\n" VALUES ('6223161000568866778',0.00,'2020-01-12 08:56:30'),"<\/span> +<\/span>
\n" ('6223161056881238',0.00,'2020-01-13 08:16:26'),"<\/span> +<\/span>
\n" ('6223160000568866',0.00,'2020-01-14 12:20:16')"<\/span>;<\/span>
\n\/***\u67e5\u8be2\u8d26\u6237\u4f59\u989d***\/<\/span>
\nprivate<\/span> static<\/span> final String QueryBalanceSQL =<\/span>
\n"SELECT * FROM bank.actsBalance "<\/span> +<\/span>
\n"WHERE 1=1"<\/span>;<\/span>
\n\/\/\u67e5\u8be2\u4f59\u989d\u8868\u4e2d\u6570\u636e\u8bb0\u5f55<\/span>
\nstatic<\/span> void<\/span> doQueryBalance<\/span>(<\/span>String sql)<\/span> throws SQLException {<\/span>
\nSQLWarning swarn =<\/span> null ;<\/span>
\nConnection con =<\/span> DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>Statement stmt =<\/span> con.<\/span>createStatement<\/span>(<\/span>)<\/span> )<\/span> {<\/span> \/\/\u81ea\u52a8\u5173\u95ed\u8d44\u6e90try\u8bed\u53e5<\/span>
\nstmt.<\/span>execute<\/span>(<\/span>sql)<\/span> ;<\/span>
\nResultSet rs =<\/span> stmt.<\/span>getResultSet<\/span>(<\/span>)<\/span>;<\/span>
\nwhile<\/span>(<\/span>rs.<\/span>next<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\nSystem.<\/span>out.<\/span>print<\/span>(<\/span>"cardNumber: "<\/span> +<\/span> rs.<\/span>getString<\/span>(<\/span>"cardNumber"<\/span>)<\/span>)<\/span> ;<\/span>
\n System.<\/span>out.<\/span>print<\/span>(<\/span>"\\\\tactBalance: "<\/span> +<\/span> rs.<\/span>getBigDecimal<\/span>(<\/span>"actBalance"<\/span>)<\/span>)<\/span> ;<\/span>
\n System.<\/span>out.<\/span>println<\/span>(<\/span>"\\\\ttradeDate: "<\/span> +<\/span> rs.<\/span>getTimestamp<\/span>(<\/span>"tradeDate"<\/span>)<\/span> )<\/span>;<\/span>
\n swarn =<\/span> rs.<\/span>getWarnings<\/span>(<\/span>)<\/span> ;<\/span>
\n if<\/span>(<\/span>swarn !=<\/span> null)<\/span> DBConnectManager.<\/span>PrintSQLWarning<\/span>(<\/span>swarn)<\/span>;<\/span>
\n}<\/span>
\n}<\/span>catch<\/span> (<\/span>SQLException se)<\/span> {<\/span> DBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>se)<\/span> ;<\/span> }<\/span>
\n}<\/span>
\n\/\/\u6267\u884c\u9759\u6001\u66f4\u65b0\u7c7bSQL\u547d\u4ee4\u5bf9\u66f4\u65b0\u6570\u636e\u5e93<\/span>
\npublic<\/span> static<\/span> void<\/span> doUpdateStatement<\/span>(<\/span> String sql )<\/span> throws SQLException
\n{<\/span>
\nConnection con =<\/span> DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> {<\/span>
\nStatement stmt =<\/span> con.<\/span>createStatement<\/span>(<\/span>)<\/span> ;<\/span>
\nstmt.<\/span>executeUpdate<\/span>(<\/span>sql)<\/span>;<\/span>
\n}<\/span>catch<\/span> (<\/span>SQLException se)<\/span> {<\/span> DBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>se)<\/span> ;<\/span> }<\/span>
\n}<\/span>
\npublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String[<\/span>]<\/span> args)<\/span> throws SQLException {<\/span>
\nif<\/span> (<\/span>DBConnectManager.<\/span>connectDb<\/span>(<\/span>dbName)<\/span>==<\/span>false<\/span>)<\/span>
\n{<\/span> \/\/\u8fde\u63a5\u5931\u8d25，\u65b0\u5efa\u6570\u636e\u5e93<\/span>
\nDBConnectManager.<\/span>CreateDbTable<\/span>(<\/span>dbName,<\/span> CrtActsBalanceTableSQL)<\/span>;<\/span>
\nDBConnectManager.<\/span>CreateDbTable<\/span>(<\/span>dbName,<\/span> CrtActsDetailTableSQL)<\/span>;<\/span>
\ndoUpdateStatement<\/span>(<\/span>InitTableSQL)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u6570\u636e\u5e93\u521b\u5efa\u5b8c\u6bd5！"<\/span>)<\/span>;<\/span>
\n}<\/span>
\ndoQueryBalance<\/span>(<\/span>QueryBalanceSQL)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u7a0b\u5e8f\u8fd0\u884c\u5b8c\u6bd5！"<\/span>)<\/span>;<\/span>
\n}<\/span>
\n}<\/span> \/\/\u7a0b\u5e8fDbOperate.java\u7ed3\u675f<\/span><\/p>\n

\u7f16\u8bd1\u8fd0\u884c\u4f8b\u7a0bDbOperate，\u7a0b\u5e8f\u521d\u6b21\u8fd0\u884c\u65f6\u7684\u6d4b\u8bd5\u6548\u679c\u56fe：
\n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
\n\u4e0a\u56fe\u662f\u7a0b\u5e8f\u6b63\u5e38\u8fd0\u884c\u6548\u679c，\u6570\u636e\u5e93\u53ca\u4e8c\u4e2a\u8868\u5df2\u6210\u529f\u5efa\u7acb\u3002\u7a0b\u5e8f\u8fd0\u884c\u524d\u521d\u59cb\u72b6\u6001\u6ca1\u6709\u6570\u636e\u5e93\u76ee\u5f55\u201cD:\\\\DB\\\\BankDB\u201d，\u7a0b\u5e8f\u6267\u884c\u540e\u6570\u636e\u5e93\u81ea\u52a8\u5efa\u7acb\u5728\u201cD:\\\\DB\\\\BankDB\u201d\u76ee\u5f55\u91cc\u3002
\n\u5982\u679c\u663e\u793a\u201cJDBC\u9a71\u52a8： org.apache.derby.jdbc.EmbeddedDriver \u4e0d\u5728CLASSPATH\u8def\u5f84\u91cc\u201d，\u8868\u793a\u7a0b\u5e8f\u627e\u4e0d\u5230\u6570\u636e\u5e93derby\u9a71\u52a8\u7a0b\u5e8f\u3002\u89e3\u51b3\u65b9\u6cd5\u5982\u4e0b\u9762\u8bf4\u660e\u6240\u793a\u3002<\/p>\n

\u8bf4\u660e：\u7f16\u5199derby\u6570\u636e\u5e93\u7a0b\u5e8f\u65f6\u6709\u4e8c\u79cd\u65b9\u5f0f\u6307\u793a\u6570\u636e\u5e93\u9a71\u52a8\u7684\u8def\u5f84，\u4e00\u79cd\u662f\u628aderby.tar\u7684\u8def\u5f84\u914d\u7f6e\u5728CLASSPATH\u91cc；\u53e6\u4e00\u79cd\u662f\u5982\u4e0b\u56fe，\u901a\u8fc7\u201c\u589e\u52a0\u5916\u90e8JAR\u5305（Add External JARs\u2026）\u201d\u7684\u65b9\u5f0f，\u914d\u7f6e\u5230\u6784\u5efa\u8def\u5f84（Build Path）\u4e2d\u3002
\n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

15.7.2 \u589e\u52a0\u5b58\u6b3e\u548c\u53d6\u6b3e\u7b49\u529f\u80fd<\/p>\n

\u7136\u540e，\u518d\u7ed9class DbOperate\u589e\u52a0\u529f\u80fd，\u5148\u589e\u52a0\u5982\u4e0b\u7684SQL\u8bed\u53e5\u5b9a\u4e49：<\/p>\n

\/***\u6309\u8d26\u53f7\u7528\u52a8\u6001SQL\u8bed\u53e5\u67e5\u8be2\u8d26\u6237\u4f59\u989d***\/<\/span>
\nprivate<\/span> static<\/span> final String QueryBalanceSQL3 =<\/span>
\n"SELECT * FROM bank.actsBalance "<\/span> +<\/span>
\n"WHERE cardNumber = ? "<\/span>;<\/span><\/p>\n

\/***\u67e5\u8be2\u8d26\u6237\u660e\u7ec6***\/<\/span>
\nprivate<\/span> static<\/span> final String QueryDetailSQL =<\/span>
\n"SELECT cardNumber,deposit,withdraw,tradeDate "<\/span> +<\/span>
\n"FROM bank.actsDetail "<\/span>;<\/span><\/p>\n

\/***\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868\u7684SQL\u8bed\u53e5\u811a\u672c***\/<\/span>
\nprivate<\/span> static<\/span> final String UpdateBalanceSQL =<\/span>
\n"UPDATE bank.actsBalance SET actBalance=? , tradeDate=? "<\/span> +<\/span>
\n "WHERE cardNumber=? "<\/span>;<\/span><\/p>\n

\/***\u53d6\u6b3e\u7684SQL\u8bed\u53e5\u811a\u672c***\/<\/span>
\nprivate<\/span> static<\/span> final String DepositSQL =<\/span>
\n"INSERT INTO bank.actsDetail(cardNumber, deposit, tradeDate) "<\/span> +<\/span>
\n"VALUES(?, ?, ?)"<\/span> ;<\/span>
\n\/***\u5b58\u6b3e\u7684SQL\u8bed\u53e5\u811a\u672c***\/<\/span>
\nprivate<\/span> static<\/span> final String WithdrawSQL =<\/span>
\n"INSERT INTO bank.actsDetail(cardNumber, withdraw, tradeDate) "<\/span> +<\/span>
\n"VALUES(?, ?, ?)"<\/span> ;<\/span><\/p>\n

\u518d\u7ed9class DbOperate\u589e\u52a0\u529f\u80fd，\u7136\u540e\u518d\u589e\u52a0\u5982\u4e0b\u7684\u65b9\u6cd5\u5b9a\u4e49：<\/p>\n

\/\/\u6267\u884c\u52a8\u6001SQL\u8bed\u53e5（\u9884\u7f16\u8bd1SQL\u8bed\u53e5）\u6570\u636e\u5e93DML\u66f4\u65b0\u7684\u65b9\u6cd5<\/span>
\npublic<\/span> static<\/span> int<\/span> DoPstmt<\/span>(<\/span>String actNo,<\/span>BigDecimal amount ,<\/span>Timestamp stamp,<\/span>String sql)<\/span> throws SQLException {<\/span>
\nint<\/span> num =<\/span> 0<\/span>;<\/span>
\nConnection con =<\/span>DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>sql)<\/span> )<\/span>
\n{<\/span>
\npstmt.<\/span>clearParameters<\/span>(<\/span>)<\/span> ;<\/span>
\npstmt.<\/span>setString<\/span>(<\/span>1<\/span>,<\/span> actNo)<\/span> ;<\/span>
\npstmt.<\/span>setBigDecimal<\/span>(<\/span>2<\/span>,<\/span> amount)<\/span> ;<\/span>
\npstmt.<\/span>setTimestamp<\/span>(<\/span>3<\/span>,<\/span> stamp)<\/span>;<\/span> \/\/\u8bbe\u7f6e\u65f6\u95f4\u6233<\/span>
\nnum =<\/span> pstmt.<\/span>executeUpdate<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException e)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>e)<\/span>;<\/span>
\n}<\/span>
\nreturn<\/span> num;<\/span>
\n}<\/span><\/p>\n

\/\/\u5b58\u6b3e\u65b9\u6cd5Deposit()<\/span>
\npublic<\/span> static<\/span> void<\/span> Deposit<\/span>(<\/span>String actNo,<\/span>BigDecimal amount ,<\/span>Timestamp stamp)<\/span> throws SQLException {<\/span>
\nboolean flg =<\/span> true<\/span>;<\/span>
\nUpdateBalance<\/span>(<\/span>actNo,<\/span> amount,<\/span> stamp,<\/span> flg)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868<\/span>
\nDoPstmt<\/span>(<\/span> actNo,<\/span> amount ,<\/span> stamp,<\/span> DepositSQL)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u660e\u7ec6\u96e8\u8868<\/span>
\n}<\/span>
\n\/\/\u53d6\u6b3e\u65b9\u6cd5Withdraw()<\/span>
\npublic<\/span> static<\/span> void<\/span> Withdraw<\/span>(<\/span>String actNo,<\/span>BigDecimal amount ,<\/span>Timestamp stamp)<\/span> throws SQLException {<\/span>
\nboolean flg =<\/span> false<\/span>;<\/span>
\nUpdateBalance<\/span>(<\/span>actNo,<\/span> amount,<\/span> stamp,<\/span> flg)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868<\/span>
\nDoPstmt<\/span>(<\/span> actNo,<\/span> amount ,<\/span> stamp,<\/span> WithdrawSQL)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u660e\u7ec6\u96e8\u8868<\/span>
\n}<\/span><\/p>\n

\/\/\u66f4\u65b0\u4f59\u989d\u8868\u8d26\u6237\u4f59\u989d\u65b9\u6cd5UpdateBalance()<\/span>
\npublic<\/span> static<\/span> void<\/span> UpdateBalance<\/span>(<\/span>String actNo,<\/span>BigDecimal amtt ,<\/span>Timestamp stamp,<\/span>boolean flag)<\/span> throws SQLException {<\/span>
\nConnection con =<\/span> null;<\/span>
\nBigDecimal balance =<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>0.0<\/span>)<\/span> ;<\/span> \/\/\u4f59\u989d<\/span>
\nBigDecimal newbalance =<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>0.0<\/span>)<\/span> ;<\/span> \/\/\u65b0\u4f59\u989d<\/span><\/p>\n

System.<\/span>out.<\/span>println<\/span>(<\/span>"UpdateBalance\u65b9\u6cd5Begin："<\/span> )<\/span>;<\/span>
\n\/\/\u5148\u67e5\u8be2\u8d26\u6237\u4f59\u989d<\/span>
\ncon =<\/span>DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>QueryBalanceSQL3)<\/span> )<\/span>
\n{<\/span>
\npstmt.<\/span>clearParameters<\/span>(<\/span>)<\/span> ;<\/span>
\npstmt.<\/span>setString<\/span>(<\/span>1<\/span>,<\/span> actNo)<\/span> ;<\/span>
\nResultSet resultSet =<\/span> pstmt.<\/span>executeQuery<\/span>(<\/span>)<\/span>;<\/span> \/\/\u6267\u884c\u6570\u636e\u5e93\u67e5\u8be2<\/span>
\nif<\/span> (<\/span>resultSet.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>
\nbalance =<\/span> resultSet.<\/span>getBigDecimal<\/span>(<\/span>"actBalance"<\/span>)<\/span>;<\/span> \/\/\u5f97\u5230\u8d26\u6237\u66f4\u65b0\u524d\u4f59\u989d<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException e)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>e)<\/span>;<\/span>
\n}<\/span>
\nif<\/span> (<\/span>flag)<\/span> {<\/span> \/\/flag = true \u5b58\u6b3e<\/span>
\nnewbalance =<\/span> balance.<\/span>add<\/span>(<\/span>amtt)<\/span>;<\/span> \/\/\u52a0\u4e0a\u5b58\u6b3e\u989d<\/span>
\n}<\/span> else<\/span> {<\/span> \/\/flag = false \u53d6\u6b3e<\/span>
\nnewbalance =<\/span> balance.<\/span>subtract<\/span>(<\/span>amtt)<\/span>;<\/span> \/\/\u51cf\u53bb\u53d6\u6b3e\u989d<\/span>
\n}<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u65b0\u4f59\u989d："<\/span>+<\/span>newbalance +<\/span>"\u53d1\u751f\u989d："<\/span>+<\/span>amtt)<\/span>;<\/span>
\n\/\/\u66f4\u65b0\u4f59\u989d\u8868\u4e2d\u7684\u8d26\u6237\u4f59\u989d<\/span>
\ncon =<\/span>DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>UpdateBalanceSQL)<\/span> )<\/span>
\n{<\/span>
\npstmt.<\/span>clearParameters<\/span>(<\/span>)<\/span> ;<\/span>
\npstmt.<\/span>setBigDecimal<\/span>(<\/span>1<\/span>,<\/span> newbalance)<\/span> ;<\/span> \/\/\u8bbe\u7f6e\u65b0\u4f59\u989d<\/span>
\npstmt.<\/span>setTimestamp<\/span>(<\/span>2<\/span>,<\/span> stamp)<\/span>;<\/span> \/\/\u8bbe\u7f6e\u65f6\u95f4\u6233<\/span>
\npstmt.<\/span>setString<\/span>(<\/span>3<\/span>,<\/span> actNo)<\/span> ;<\/span>
\npstmt.<\/span>executeUpdate<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException e)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>e)<\/span>;<\/span>
\n}<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"UpdateBalance\u65b9\u6cd5end："<\/span> )<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/\u67e5\u8be2\u660e\u7ec6\u8868\u4e2d\u7684\u6570\u636e\u8bb0\u5f55cardNumber,deposit,withdraw,tradeDate<\/span>
\n static<\/span> void<\/span> doQueryDetail<\/span>(<\/span>String sql)<\/span> throws SQLException {<\/span>
\n SQLWarning swarn =<\/span> null ;<\/span>
\n Connection con =<\/span> DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>sql)<\/span> )<\/span> {<\/span> \/\/\u81ea\u52a8\u5173\u95ed\u8d44\u6e90try\u8bed\u53e5<\/span>
\npstmt.<\/span>executeQuery<\/span>(<\/span>)<\/span>;<\/span>
\nResultSet rs =<\/span> pstmt.<\/span>getResultSet<\/span>(<\/span>)<\/span>;<\/span>
\nBigDecimal je =<\/span> null;<\/span>
\n while<\/span>(<\/span>rs.<\/span>next<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n System.<\/span>out.<\/span>print<\/span>(<\/span>"cardNumber: "<\/span> +<\/span> rs.<\/span>getString<\/span>(<\/span>"cardNumber"<\/span>)<\/span>)<\/span> ;<\/span>
\n je =<\/span> rs.<\/span>getBigDecimal<\/span>(<\/span>"deposit"<\/span>)<\/span>;<\/span>
\n System.<\/span>out.<\/span>print<\/span>(<\/span>"\\\\tdeposit: "<\/span> +<\/span> (<\/span> (<\/span>je==<\/span>null)<\/span>?<\/span> " "<\/span> :<\/span> je )<\/span> )<\/span> ;<\/span>
\n je =<\/span> rs.<\/span>getBigDecimal<\/span>(<\/span>"withdraw"<\/span>)<\/span>;<\/span>
\n System.<\/span>out.<\/span>print<\/span>(<\/span>"\\\\twithdraw: "<\/span> +<\/span> (<\/span> (<\/span>je==<\/span>null)<\/span>?<\/span> " "<\/span> :<\/span> je )<\/span> )<\/span> ;<\/span>
\n System.<\/span>out.<\/span>println<\/span>(<\/span>"\\\\ttradeDate: "<\/span> +<\/span> rs.<\/span>getTimestamp<\/span>(<\/span>"tradeDate"<\/span>)<\/span> )<\/span>;<\/span>
\n swarn =<\/span> rs.<\/span>getWarnings<\/span>(<\/span>)<\/span> ;<\/span>
\n if<\/span>(<\/span>swarn !=<\/span> null)<\/span>
\n DBConnectManager.<\/span>PrintSQLWarning<\/span>(<\/span>swarn)<\/span>;<\/span>
\n}<\/span>
\n}<\/span>catch<\/span> (<\/span>SQLException se)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>se)<\/span> ;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\u5728class DbOperate\u65b0\u589e\u52a0\u529f\u80fd\u7684\u4ee5\u4e0a\u4ee3\u7801\u540e，\u7c7b\u6e90\u6587\u4ef6\u4e2d\u5e94\u5f53\u5df2\u81ea\u52a8\u6dfb\u52a0\u4e86\u4ee5\u4e0b\u7684\u7c7b\u5bfc\u5165\u8bed\u53e5：<\/p>\n

import java.<\/span>math.<\/span>BigDecimal;<\/span>
\nimport java.<\/span>sql.<\/span>PreparedStatement;<\/span>
\nimport java.<\/span>sql.<\/span>Timestamp;<\/span><\/p>\n

\u6700\u540e\u5728main\u65b9\u6cd5\u7684\u201cSystem.out.println(\u201c\u7a0b\u5e8f\u8fd0\u884c\u5b8c\u6bd5！\u201d);\u201d\u524d\u589e\u52a0\u5982\u4e0b\u8bed\u53e5：<\/p>\n

System.<\/span>out.<\/span>println<\/span>(<\/span>"———————————————"<\/span>)<\/span>;<\/span>
\nBigDecimal je =<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>200.0<\/span>)<\/span>;<\/span>
\nTimestamp tmstamp =<\/span> new<\/span> Timestamp<\/span>(<\/span>System.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nWithdraw<\/span>(<\/span>"6223161000568866778"<\/span>,<\/span>je ,<\/span> tmstamp)<\/span>;<\/span> \/\/\u53d6\u6b3e<\/span>
\ntmstamp =<\/span> new<\/span> Timestamp<\/span>(<\/span>System.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nDeposit<\/span>(<\/span>"6223161000568866778"<\/span>,<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>100.56<\/span>)<\/span>,<\/span> tmstamp)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"———————————————"<\/span>)<\/span>;<\/span>
\ndoQueryBalance<\/span>(<\/span>QueryBalanceSQL)<\/span>;<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"———————————————"<\/span>)<\/span>;<\/span>
\ndoQueryDetail<\/span>(<\/span>QueryDetailSQL)<\/span>;<\/span><\/p>\n

\u65b0\u589e\u7684\u4ee3\u7801\u5b9e\u9645\u4e0a\u505a\u4e86\u4ee5\u4e0b\u8fd9\u51e0\u4e2a\u64cd\u4f5c：
\n1，\u4ece\u8d26\u6237"6223161000568866778"\u53d6\u6b3e200\u5143\u7684\u64cd\u4f5c：
\nWithdraw(\u201c6223161000568866778\u201d,je , tmstamp);
\n2，\u5f80\u8d26\u6237"6223161000568866778"\u5b58\u6b3e100.56\u5143\u7684\u64cd\u4f5c：
\nDeposit(\u201c6223161000568866778\u201d, BigDecimal.valueOf(100.56), tmstamp);
\n3，\u67e5\u8be2\u8d26\u6237\u4f59\u989d\u8868\u4e2d\u7684\u4fe1\u606f：
\ndoQueryBalance(QueryBalanceSQL);
\n4，\u67e5\u8be2\u8d26\u6237\u660e\u7ec6\u8868\u4e2d\u7684\u4fe1\u606f
\ndoQueryDetail(QueryDetailSQL);<\/p>\n

\u7531\u4e8e\u94f6\u884c\u501f\u8bb0\u5361\u7684\u4f59\u989d\u5fc5\u987b > =0 \u3002\u518d\u6b21\u6267\u884c\u7a0b\u5e8fDbOperate.java，\u4f1a\u6709\u5982\u4e0b\u9519\u8bef\u63d0\u793a：
\n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
\n\u7a0b\u5e8f\u8c03\u901a\u540e，\u4f60\u53ef\u6309\u81ea\u5df1\u7684\u610f\u613f\u8fdb\u884c\u4fee\u6539，\u5728\u8d26\u6237\u4f59\u989d\u8868\u4e2d\u589e\u52a0\u65b0\u7684\u8d26\u6237\u8bb0\u5f55，\u6216\u8bbe\u8ba1\u4e00\u4e9b\u5b58\u6b3e\u3001\u53d6\u6b3e\u4ea4\u6613，\u6765\u67e5\u770b\u5206\u6790\u7a0b\u5e8f\u7ed3\u679c\u3002
\n\u5982\u4f60\u505a\u5b58\u6b3e\u6216\u53d6\u6b3e\u65f6，\u91d1\u989d\u4f7f\u7528\u8d1f\u503c，\u4e5f\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u4e0a\u9762\u7684\u9519\u8bef\u3002\u8fd9\u4e9b\u9519\u8bef\u8bf4\u660e\u7a0b\u5e8f\u8f93\u5165\u7684\u6570\u636e\u6709\u95ee\u9898\u3002\u6bd4\u5982，\u53d6\u6b3e\u91d1\u989d\u5982\u679c\u662f-88.60\u5143，\u6216\u8005\u8d26\u6237\u4f59\u989d\u53ea\u670960\u5143，\u4f60\u60f3\u53d6500\u5143，\u8fd9\u4ea4\u6613\u90fd\u4e0d\u4f1a\u6210\u529f\u3002\u62a5\u9519\u662f\u7406\u6240\u5f53\u7136\u7684\u3002
\n\u94f6\u884c\u53d6\u6b3e\u4ea4\u6613\u6b63\u5e38\u7684\u60c5\u51b5\u4e0b，\u5982\u679c\u4ea4\u6613\u6210\u529f\u3002\u8d26\u6237\u4f59\u989d\u8868\u4e2d\u7684\u4f59\u989d\u8981\u51cf\u53bb\u53d6\u6b3e\u91d1\u989d，\u540c\u65f6\u8d26\u6237\u660e\u7ec6\u8868\u4e2d\u8981\u589e\u52a0\u4e00\u6761\u53d6\u6b3e\u4ea4\u6613\u7684\u8bb0\u5f55；\u5b58\u6b3e\u4ea4\u6613\u4e5f\u7c7b\u4f3c，\u53ea\u662f\u5bf9\u8d26\u6237\u4f59\u989d\u7684\u5904\u7406\u662f\u52a0\u4e0a\u5b58\u6b3e\u91d1\u989d，\u65b9\u5411\u76f8\u53cd\u3002\u4f46\u672c\u4f8b\u4e2d\u53d6\u6b3e\u91d1\u989d\u5927\u4e8e\u8d26\u6237\u4f59\u989d，\u53d1\u751f\u6570\u636e\u5e93\u64cd\u4f5c\u5f02\u5e38，\u8d26\u6237\u4f59\u989d\u66f4\u65b0\u5931\u8d25\u4e86，\u4f46\u8d26\u6237\u660e\u7ec6\u8868\u4e2d\u7684\u8bb0\u5f55\u8fd8\u662f\u589e\u52a0\u4e86\u3002\u8fd9\u5c31\u4f1a\u4ea7\u751f\u810f\u6570\u636e，\u5bfc\u81f4\u8d26\u6237\u4e0d\u5e73\u3002\u4e0b\u4e00\u8282\u5c06\u4f18\u5316\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

15.7.3 \u6570\u636e\u5e93\u8d26\u6237\u5904\u7406\u7a0b\u5e8f\u4f18\u5316<\/p>\n

\u4e0a\u9762\u7684\u7a0b\u5e8f\u8fd8\u5b58\u5728\u4e00\u4e2a\u95ee\u9898，\u4ee5\u4e0a\u9762\u663e\u793a\u7684\u8fd9\u9519\u8bef\u4fe1\u606f\u5206\u6790，\u8d26\u6237\u7684\u4f59\u989d\u4e3a0，\u5ba2\u6237\u8981\u53d6\u6b3e200\u5143，\u4f59\u989d\u4e0d\u8db3\u3002\u94f6\u884c\u4ea4\u6613\u662f\u4e0d\u4f1a\u6210\u529f\u7684\u3002\u4f46\u4e0a\u9762\u7684\u7a0b\u5e8f\u4e2d\u867d\u7136\u4f59\u989d\u8868\u4e2d\u66f4\u65b0\u8bb0\u5f55\u6ca1\u6210\u529f，\u4f46\u8d26\u6237\u660e\u7ec6\u8868\u4e2d\u5374\u63d2\u5165\u4e86\u4e00\u6761\u53d6\u6b3e200\u5143\u7684\u8bb0\u5f55（\u8fd9\u7b14\u4ea4\u6613\u5b9e\u9645\u6ca1\u6210\u529f，\u4e0d\u5e94\u5f53\u589e\u52a0\u8fd9\u6761\u53d6\u6b3e\u8bb0\u5f55）\u3002\u4e0b\u9762\u901a\u8fc7\u589e\u52a0\u6761\u4ef6\u5224\u65ad\u6765\u4f18\u5316\u4e00\u4e0b，\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002
\n\u4e3b\u8981\u4f18\u5316\u4e86\u4e09\u4e2a\u65b9\u6cd5，\u4e09\u4e2a\u65b9\u6cd5\u539f\u6765\u90fd\u662fviod\u7c7b\u578b\u65b9\u6cd5\u6ca1\u6709\u8fd4\u56de\u503c，\u73b0\u5728\u6839\u636e\u9700\u8981\u90fd\u66f4\u65b0\u4e3aboolean\u7c7b\u578b，\u65b9\u6cd5\u90fd\u8fd4\u56de\u4e00\u4e2a\u6761\u4ef6\u503c，\u8fd4\u56detrue\u8868\u793a，\u4ea4\u6613\u6210\u529f\u6216\u6b63\u5e38\u64cd\u4f5c，\u5982\u679c\u8fd4\u56defalse，\u5219\u8868\u793a\u64cd\u4f5c\u5f02\u5e38\u6216\u4ea4\u6613\u5931\u8d25\u3002\u5b58\u6b3e\u548c\u53d6\u6b3e\u65b9\u6cd5，\u90fd\u8981\u68c0\u67e5\u8d26\u6237\u4f59\u989d，\u5982\u679c\u8d26\u6237\u4f59\u989d\u662f\u8d1f\u503c，\u76f4\u63a5\u62a5\u4ea4\u6613\u5931\u8d25，\u5e76\u9000\u51fa\u65b9\u6cd5；\u5982\u679c\u8d26\u6237\u4f59\u989d\u4e3a\u6b63\u503c，\u518d\u8c03\u7528\u66f4\u65b0\u4f59\u989d\u8868\u65b9\u6cd5，\u5982\u679c\u53d6\u6b3e\u65f6\u53d1\u73b0\u4f59\u989d\u4e0d\u8db3，\u5c06\u663e\u793a\u5b58\u6b3e\u4ea4\u6613\u5931\u8d25，\u9000\u51fa\u65b9\u6cd5\u3002
\n\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868\u65b9\u6cd5UpdateBalance，\u5982\u4f59\u989d\u4e0d\u8db3\u5c06\u8fd4\u56defalse，\u6b63\u5e38\u65f6\u8fd4\u56detrue\u3002\u4e09\u4e2a\u65b9\u6cd5\u4f18\u5316\u540e\u4ee3\u7801\u5982\u4e0b：<\/p>\n

\/\/\u5b58\u6b3e\u65b9\u6cd5Deposit()<\/span>
\npublic<\/span> static<\/span> boolean Deposit<\/span>(<\/span>String actNo,<\/span>BigDecimal amount ,<\/span>Timestamp stamp)<\/span> throws SQLException {<\/span>
\nboolean rtn =<\/span> false<\/span>;<\/span>
\nboolean flg =<\/span> true<\/span>;<\/span> \/\/true\u8868\u793a\u5b58\u6b3e<\/span>
\nif<\/span> (<\/span>amount.<\/span>compareTo<\/span>(<\/span>BigDecimal.<\/span>ZERO)<\/span>==<\/span>1<\/span>)<\/span> {<\/span> \/\/\u53d1\u751famount>0<\/span>
\nrtn =<\/span> UpdateBalance<\/span>(<\/span>actNo,<\/span> amount,<\/span> stamp,<\/span> flg)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868<\/span>
\nif<\/span> (<\/span>rtn)<\/span> {<\/span> \/\/\u5982\u679crtn=true，\u5219\u767b\u8bb0\u5b58\u6b3e\u5206\u6237\u8d26<\/span>
\nDoPstmt<\/span>(<\/span> actNo,<\/span> amount ,<\/span> stamp,<\/span> DepositSQL)<\/span>;<\/span> \/\/\u589e\u52a0\u8d26\u6237\u660e\u7ec6\u8bb0\u5f55<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u5b58\u6b3e\u4ea4\u6613，\u4ea4\u6613\u6210\u529f！"<\/span> )<\/span>;<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\n}<\/span>
\nelse<\/span> {<\/span> \/\/\u5b58\u6b3e\u4ea4\u6613，\u4f59\u989d\u4e0d\u8db3，\u6c38\u8fdc\u4e0d\u4f1a\u53d1\u751f\u3002<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u5b58\u6b3e，\u4ea4\u6613\u5931\u8d25，\u4f59\u989d\u4e0d\u8db3！"<\/span> )<\/span>;<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\nelse<\/span> {<\/span> \/\/\u53d1\u751f\u989damount<0<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u5b58\u6b3e\u4ea4\u6613\u5931\u8d25！\u53d1\u751f\u989d\u4e0d\u80fd\u4e3a\u8d1f\u503c：amount="<\/span>+<\/span>amount )<\/span>;<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\/\/\u53d6\u6b3e\u65b9\u6cd5Withdraw()<\/span>
\npublic<\/span> static<\/span> boolean Withdraw<\/span>(<\/span>String actNo,<\/span>BigDecimal amount ,<\/span>Timestamp stamp)<\/span> throws SQLException {<\/span>
\nboolean rtn =<\/span> false<\/span>;<\/span>
\nboolean flg =<\/span> false<\/span>;<\/span> \/\/false\u8868\u793a\u5b58\u6b3e<\/span>
\nif<\/span> (<\/span>amount.<\/span>compareTo<\/span>(<\/span>BigDecimal.<\/span>ZERO)<\/span>==<\/span>1<\/span>)<\/span> {<\/span> \/\/\u53d1\u751f\u989damount>0<\/span>
\nrtn =<\/span> UpdateBalance<\/span>(<\/span>actNo,<\/span> amount,<\/span> stamp,<\/span> flg)<\/span>;<\/span> \/\/\u66f4\u65b0\u8d26\u6237\u4f59\u989d\u8868<\/span>
\nif<\/span> (<\/span>rtn)<\/span> {<\/span> \/\/\u5982\u679crtn=true，\u5219\u767b\u8bb0\u5b58\u6b3e\u5206\u6237\u8d26<\/span>
\nDoPstmt<\/span>(<\/span> actNo,<\/span> amount ,<\/span> stamp,<\/span> WithdrawSQL)<\/span>;<\/span> \/\/\u589e\u52a0\u660e\u7ec6\u8868\u53d6\u6b3e\u8bb0\u5f55<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u53d6\u6b3e\u4ea4\u6613，\u4ea4\u6613\u6210\u529f！"<\/span> )<\/span>;<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\n}<\/span>
\nelse<\/span>{<\/span> \/\/\u53d6\u6b3e\u4ea4\u6613，\u4f59\u989d\u4e0d\u8db3<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u53d6\u6b3e，\u4ea4\u6613\u5931\u8d25，\u4f59\u989d\u4e0d\u8db3！"<\/span> )<\/span>;<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\nelse<\/span> {<\/span> \/\/\u53d1\u751f\u989damount<0<\/span>
\nSystem.<\/span>out.<\/span>println<\/span>(<\/span>"\u53d6\u6b3e\u4ea4\u6613\u5931\u8d25！\u53d1\u751f\u989d\u4e0d\u80fd\u4e3a\u8d1f\u503c：amount="<\/span>+<\/span>amount )<\/span>;<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\/\/\u66f4\u65b0\u4f59\u989d\u8868\u8d26\u6237\u4f59\u989d\u65b9\u6cd5UpdateBalance()<\/span>
\npublic<\/span> static<\/span> boolean UpdateBalance<\/span>(<\/span>String actNo,<\/span>BigDecimal amtt ,<\/span>Timestamp stamp,<\/span>boolean flag)<\/span> throws SQLException {<\/span>
\nConnection con =<\/span> null;<\/span>
\nBigDecimal balance =<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>0.0<\/span>)<\/span> ;<\/span> \/\/\u4f59\u989d<\/span>
\nBigDecimal newbalance =<\/span> BigDecimal.<\/span>valueOf<\/span>(<\/span>0.0<\/span>)<\/span> ;<\/span> \/\/\u65b0\u4f59\u989d<\/span><\/p>\n

System.<\/span>out.<\/span>println<\/span>(<\/span>"UpdateBalance\u65b9\u6cd5Begin："<\/span> )<\/span>;<\/span>
\n\/\/\u5148\u67e5\u8be2\u8d26\u6237\u4f59\u989d<\/span>
\ncon =<\/span>DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>QueryBalanceSQL3)<\/span> )<\/span>
\n{<\/span>
\npstmt.<\/span>clearParameters<\/span>(<\/span>)<\/span> ;<\/span>
\npstmt.<\/span>setString<\/span>(<\/span>1<\/span>,<\/span> actNo)<\/span> ;<\/span>
\nResultSet resultSet =<\/span> pstmt.<\/span>executeQuery<\/span>(<\/span>)<\/span>;<\/span> \/\/\u6267\u884c\u6570\u636e\u5e93\u67e5\u8be2<\/span>
\nif<\/span> (<\/span>resultSet.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>
\nbalance =<\/span> resultSet.<\/span>getBigDecimal<\/span>(<\/span>"actBalance"<\/span>)<\/span>;<\/span> \/\/\u5f97\u5230\u8d26\u6237\u66f4\u65b0\u524d\u4f59\u989d<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException e)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>e)<\/span>;<\/span>
\n}<\/span>
\nif<\/span> (<\/span>flag)<\/span> {<\/span> \/\/flag = true \u8868\u793a\u5b58\u6b3e<\/span>
\nnewbalance =<\/span> balance.<\/span>add<\/span>(<\/span>amtt)<\/span>;<\/span> \/\/\u52a0\u4e0a\u5b58\u6b3e\u989d<\/span>
\n}<\/span> else<\/span> {<\/span> \/\/flag = false \u8868\u793a\u53d6\u6b3e<\/span>
\nnewbalance =<\/span> balance.<\/span>subtract<\/span>(<\/span>amtt)<\/span>;<\/span> \/\/\u51cf\u53bb\u53d6\u6b3e\u989d<\/span>
\n}<\/span><\/p>\n

System.<\/span>out.<\/span>println<\/span>(<\/span>"\u65b0\u4f59\u989d："<\/span>+<\/span>newbalance +<\/span>"\u53d1\u751f\u989d："<\/span>+<\/span>amtt)<\/span>;<\/span>
\nif<\/span> (<\/span>newbalance.<\/span>compareTo<\/span>(<\/span>BigDecimal.<\/span>ZERO)<\/span>==<\/span>–<\/span>1<\/span>)<\/span> {<\/span> \/\/\u4f59\u989d\u4e0d\u8db3，\u5c0f\u4e8e0<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/\u66f4\u65b0\u4f59\u989d\u8868\u4e2d\u7684\u8d26\u6237\u4f59\u989d<\/span>
\ncon =<\/span>DBConnectManager.<\/span>GetConnection<\/span>(<\/span>dbName)<\/span>;<\/span>
\ntry<\/span> (<\/span>PreparedStatement pstmt =<\/span> con.<\/span>prepareStatement<\/span>(<\/span>UpdateBalanceSQL)<\/span> )<\/span>
\n{<\/span>
\npstmt.<\/span>clearParameters<\/span>(<\/span>)<\/span> ;<\/span>
\npstmt.<\/span>setBigDecimal<\/span>(<\/span>1<\/span>,<\/span> newbalance)<\/span> ;<\/span> \/\/\u8bbe\u7f6e\u65b0\u4f59\u989d<\/span>
\npstmt.<\/span>setTimestamp<\/span>(<\/span>2<\/span>,<\/span> stamp)<\/span>;<\/span> \/\/\u8bbe\u7f6e\u65f6\u95f4\u6233<\/span>
\npstmt.<\/span>setString<\/span>(<\/span>3<\/span>,<\/span> actNo)<\/span> ;<\/span>
\npstmt.<\/span>executeUpdate<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span> catch<\/span> (<\/span>SQLException e)<\/span> {<\/span>
\nDBConnectManager.<\/span>PrintSQLException<\/span>(<\/span>e)<\/span>;<\/span>
\n}<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\n}<\/span>\/\/\u66f4\u65b0\u4f59\u989d\u8868\u8d26\u6237\u4f59\u989d\u65b9\u6cd5UpdateBalance()\u7ed3\u675f\u3002<\/span><\/p>\n

\u7a0b\u5e8f\u8c03\u901a\u540e，\u5220\u9664\u6570\u636e\u5e93D:\\\\DB\\\\BankDB，\u4f60\u518d\u4ece\u5934\u5f00\u59cb，\u76f8\u5f53\u4e8e\u91cd\u65b0\u521d\u59cb\u5316\u6570\u636e\u5e93\u73af\u5883\u3002\u518d\u6309\u81ea\u5df1\u7684\u60f3\u6cd5\u4fee\u6539main\u65b9\u6cd5\u4e2d\u7684\u5b58\u53d6\u6b3e\u4ea4\u6613\u91d1\u989d\u8bd5\u8bd5，\u5728\u8d26\u6237\u4f59\u989d\u8868\u4e2d\u589e\u52a0\u65b0\u7684\u8d26\u6237\u8bb0\u5f55，\u6216\u8bbe\u8ba1\u4e00\u4e9b\u5b58\u6b3e\u3001\u53d6\u6b3e\u4ea4\u6613，\u6765\u67e5\u770b\u5206\u6790\u7a0b\u5e8f\u7ed3\u679c\u3002
\n\u5e94\u5f53\u4e0d\u4f1a\u518d\u51fa\u73b0\u8fdd\u53cd\u6570\u636e\u5e93\u7ea6\u675f\u7684\u5f02\u5e38\u3002\u5982\u679c\u6761\u4ef6\u4e0d\u6b63\u786e，\u5c06\u62a5\u4ea4\u6613\u5931\u8d25，\u5e76\u4e0d\u4f1a\u66f4\u65b0\u6570\u636e\u5e93，\u8d26\u6237\u662f\u5e73\u7684\u3002<\/p>\n

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

\u6d4b\u8bd5\u8bb0\u5f55，\u521d\u59cb\u4f59\u989d\u662f0.0\u5143，\u5b58\u6b3e\u4e8c\u7b14，\u53d6\u6b3e\u4e00\u7b14，\u6700\u7ec8\u4f59\u989d\u662f140.60\u5143\u3002
\n\u8bf4\u660e：\u4ee5\u4e0a\u662f\u5355\u7528\u6237\u6a21\u5f0f\u7684\u5e94\u7528\u573a\u666f\u3002\u5982\u662f\u591a\u7ebf\u7a0b\u591a\u7528\u6237\u573a\u666f，\u8fd8\u8981\u5728\u64cd\u4f5c\u6570\u636e\u5e93\u8bb0\u5f55\u65f6\u589e\u52a0\u52a0\u9501\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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