使用Mysql中的executeUpdate通过sql语句创建表
我有以下doGet() ：
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { MysqlDataSource ds = new MysqlConnectionPoolDataSource(); ds.setServerName("localhost"); ds.setPort(3306); ds.setUser("root"); ds.setPassword(""); try { Connection connection = null ; connection = ds.getConnection(); Statement statement = connection.createStatement(); // create the DB .. statement.executeUpdate("CREATE DATABASE IF NOT EXISTS " +"testSQLtable" ) ; // use DB .. statement.executeUpdate("USE testSQLtable") ; // create table ... statement.executeUpdate("DROP TABLE IF EXISTS account " +"CREATE TABLE account ( " +"accountNum INT( 11 )," +"dateCreated DATE NOT NULL," +"accountName TEXT," +"description TEXT," +"statusAccount TEXT," +"sumOfMoney INT( 11 ) NOT NULL DEFAULT 0 );" ) ; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
创建DB的前两个executeUpdate并使用他工作正常。 在运行时到达行statement.executeUpdate("DROP TABLE IF EXISTS accounnt ....."它会引发exception –
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CREATE TABLE account ( accountNum INT( 11 ),dateCreated DATE NOT NULL,accountNa' at line 1 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) at com.mysql.jdbc.Util.getInstance(Util.java:386) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2713) at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1794) at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1712) at control.CreateDBinitialServlet.doGet(CreateDBinitialServlet.java:56) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
这适用于您的情况：
statement.executeUpdate("DROP TABLE IF EXISTS account "); statement.executeUpdate("CREATE TABLE account ( " +"accountNum INT( 11 )," +"dateCreated DATE NOT NULL," +"accountName TEXT," +"description TEXT," +"statusAccount TEXT," +"sumOfMoney INT( 11 ) NOT NULL DEFAULT 0 )" ) ;
原因：语句只能在每次调用execute-methods时执行一个SQL语句。
如果要同时执行两个或多个语句，可以使用批处理作业执行此操作。
喜欢：
statement.addBatch("DROP TABLE IF EXISTS account "); statement.addBatch("CREATE TABLE account ( " +"accountNum INT( 11 )," +"dateCreated DATE NOT NULL," +"accountName TEXT," +"description TEXT," +"statusAccount TEXT," +"sumOfMoney INT( 11 ) NOT NULL DEFAULT 0 )" ) ; statement.executeBatch();
您在第一个语句的末尾缺少分号：
statement.executeUpdate("DROP TABLE IF EXISTS account; " +"CREATE TABLE account ( " +"accountNum INT( 11 )," +"dateCreated DATE NOT NULL," +"accountName TEXT," +"description TEXT," +"statusAccount TEXT," +"sumOfMoney INT( 11 ) NOT NULL DEFAULT 0 );" ) ;
根据executeUpdate的文档，此函数一次只能执行一个语句。 然后你需要对executeUpdate进行两次单独的调用：
statement.executeUpdate("DROP TABLE IF EXISTS account"); statement.executeUpdate("CREATE TABLE account (" +"accountNum INT( 11 )," +"dateCreated DATE NOT NULL," +"accountName TEXT," +"description TEXT," +"statusAccount TEXT," +"sumOfMoney INT( 11 ) NOT NULL DEFAULT 0 );" ) ;