Java 在Mysql中使用executeUpdate在by sql语句中创建表
我有以下Java 在Mysql中使用executeUpdate在by sql语句中创建表,java,mysql,sql,create-table,sp-executesql,Java,Mysql,Sql,Create Table,Sp Executesql,我有以下doGet(): create DB and use him的前两个executeUpdate工作正常。在运行时,到达行语句.executeUpdate(“如果Account…..存在,则删除表”)它会引发异常- com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your
doGet()
:
create DB and use him的前两个executeUpdate
工作正常。在运行时,到达行语句.executeUpdate(“如果Account…..存在,则删除表”)
它会引发异常-
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)
第一条语句末尾缺少分号:
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 );" ) ;
根据的文档,此函数一次只能执行一条语句。然后需要分别调用executeUpdate
:
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 );" ) ;
这应该适用于您的情况:
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:语句在每次调用execute方法时只能执行一条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。比如:
尝试删除第3条语句末尾的分号。
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 )" ) ;
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();