问题
I have the following 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();
}
}
The first two executeUpdate of create DB and use him works fine . When in running reach to the line statement.executeUpdate("DROP TABLE IF EXISTS accounnt ....." it throws an 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)
回答1:
This should work in your case:
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 )" ) ;
Cause: Statements can only execute one SQL-Statement with every call of the execute-methods.
If you want to execute two or more statements simultaneously you can do this with Batch-Jobs.
Like:
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();
回答2:
You are missing a semi-colon at the end of the first statement:
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 );" ) ;
According to the documentation for executeUpdate, this function can execute only one statement at a time. Then you need to make two separate calls to 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 );" ) ;
来源：https://stackoverflow.com/questions/11962028/create-table-in-by-sql-statement-using-executeupdate-in-mysql