我在更新数据库时不断获得MySQLSyntaxErrorException
。
以下是错误的堆栈跟踪:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:您的SQL语法中有错误;检查与您的MySQL服务器版本相对应的手册,以获得正确的语法,以便在'?,?,?,?,?,?,?)附近使用?'在第1行 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 在com.mysql.jdbc.Util.handleNewInstance(Util.java:411) 在com.mysql.jdbc.Util.getInstance(Util.java:386) 在com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053) 在com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120) 在com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052) 在com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503) 在com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664) 在com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2788) 在com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2738) 在com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:899) 在com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:737) 在Lab6.StudentDB.writeToSQL(StudentDB.java:166) 在Lab6.StudentDB.add(StudentDB.java:83) 在Lab6.LabWeek6GUI.addJButtonActionPerformed(LabWeek6GUI.java:204) 在Lab6.LabWeek6GUI.access $ 000(LabWeek6GUI.java:16) 在Lab6.LabWeek6GUI $ 2.actionPerformed(LabWeek6GUI.java:68) 在javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 在javax.swing.AbstractButton $ Handler.actionPerformed(AbstractButton.java:2348) 在javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) 在javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) 在javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6533) 在javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access $ 500(EventQueue.java:97) at java.awt.EventQueue $ 3.run(EventQueue.java:709) at java.awt.EventQueue $ 3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue $ 4.run(EventQueue.java:731) at java.awt.EventQueue $ 4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) 在java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
这是我的代码。
String sql = "INSERT INTO studentDB (id, name, grade, avg, test1, test2, test3) "
+ "VALUES (?, ?, ?, ?, ?, ?, ?)";
stmt.execute(sql);
PreparedStatement preparedStatement = conn.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.setString(2, name);
preparedStatement.setString(3, grade);
preparedStatement.setDouble(4, avg);
preparedStatement.setDouble(5, test1);
preparedStatement.setDouble(6, test2);
preparedStatement.setDouble(7, test3);
preparedStatement.executeUpdate();
答案 0 :(得分:1)
您的例外来自stmt.execute(sql);
,请将其删除。您之后似乎正确使用了PreparedStatement
(但由于前面提到的stmt.execute(sql)
试图在未设置绑定参数的情况下运行查询,因此您的代码尚未到达。