ClassCastException从数据库中的组合框插入数据

时间：2016-10-04 18:53:02

标签： java jdbc classcastexception

我尝试插入两个字段（ SELECT cp.countid , ci.countnum FROM ( SELECT COUNT(p.ID) AS countid FROM PART p WHERE p.USERID = $P{userId} AND p.CREATION_DATE = $P{creationDate} ) cp CROSS JOIN ( SELECT COUNT(i.NUM) AS countnum FROM IDENTITY i WHERE i.USERID = $P{userId} AND i.CREATION_DATE = $P{creationDate} ) ci 中的优先级和根据组合中选择的选项获取的ID）并完成其余字段（所有字符串）提交所有...但我得到这个Stacktrace：

JCombobox

在以下两行：

run:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: br.com.jdbc.victor.model.PriorityDetail cannot be cast to java.lang.String
    at br.com.jdbc.victor.view.FormNewCall.btSubmitActionPerformed(FormNewCall.java:349)
    at br.com.jdbc.victor.view.FormNewCall.access$500(FormNewCall.java:30)
    at br.com.jdbc.victor.view.FormNewCall$6.actionPerformed(FormNewCall.java:151)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6533)
    at 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:76)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    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:76)
    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.pumpEventsForFilter(EventDispatchThread.java:109)
    at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:184)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:229)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:227)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227)
    at java.awt.Dialog.show(Dialog.java:1084)
    at java.awt.Component.show(Component.java:1671)
    at java.awt.Component.setVisible(Component.java:1623)
    at java.awt.Window.setVisible(Window.java:1014)
    at java.awt.Dialog.setVisible(Dialog.java:1005)
    at br.com.jdbc.victor.view.FormNewCall.lambda$main$0(FormNewCall.java:495)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
    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:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
    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)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

此表单以这种方式工作：您在private void btSubmitActionPerformed(java.awt.event.ActionEvent evt) { try { Call call = new Call(); MySQLDaoManager man = new MySQLDaoManager("root", "", "localhost", "attendances", 3306); java.util.Date date_util = new java.util.Date(); java.sql.Date date_sql = new java.sql.Date(date_util.getDate()); java.sql.Time time_sql = new java.sql.Time(date_util.getTime()); try { //ClassCastException at this line above call.setPriority((String) cbPriorityDetail.getSelectedItem()); //this one is giving SQL Error and it's flagged by the Catch block of the code call.setPriorityDetail(Long.parseLong(tfIdPriorityDetail.getText())); call.setInitialDate(date_sql); call.setInitialTime(time_sql); call.setFinalTime(time_sql); man.getCallDAO().insert(call); if(tfCallId.getText().length() != 0){ call.setCallId(Long.parseLong(tfCallId.getText())); man.getCallDAO().update(call); } if(tfInitialDate.getValue() != null && tfInitialTime.getValue() != null && tfFinalTime.getValue() != null){ JOptionPane.showMessageDialog(rootPane, "Inserted User sucessful!!", "Done", JOptionPane.INFORMATION_MESSAGE); btNewActionPerformed(evt); } else { JOptionPane.showMessageDialog(rootPane, "Please fill the fields again", "Isn't possible to insert data", JOptionPane.INFORMATION_MESSAGE); btNewActionPerformed(evt); } } catch (DAOException ex) { JOptionPane.showMessageDialog(rootPane, "MySQL Error", "Error", JOptionPane.ERROR_MESSAGE); } } catch (SQLException ex) { JOptionPane.showMessageDialog(rootPane, "Error to get connection", "Error", JOptionPane.ERROR_MESSAGE); } } JComboBox选择高，中或低之间的一个项目，cbPriorityDetail根据所选优先级获取相应的ID（我已经做了一个功能，并且它工作正常）并填写接下来的三个字段：初始日期，初始时间和最终时间...如果我评论这两行有错误并提交其余的工作良好。 我的代码有什么问题需要帮助吗？！我无法在Calls表中插入所选的组合项和生成的ID，我总是面临这些错误，非常感谢！

1 个答案:

答案 0 :(得分：1)

您的组合框似乎管理着＆＃39; PriorityDetail＆＃39;对象，而不是字符串。您应该将所选对象转换为＆＃39; PriorityDetail＆＃39;然后从中获取所需的数据。

PriorityDetail pd = (PriorityDetail) cbPriorityDetail.getSelectedItem();
call.setPriority(pd.getTheStringThatYouNeedFromYourModel());

希望它有所帮助。

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