Java ResultSet 关闭如何修复

Question

问题是，当我单击“更新”按钮将表单插入到文本字段时，我可以在其中编辑约会，但当我单击“更新”按钮时，出现错误“结果集已关闭”

try {
    int row = jTable5.getSelectedRow();
    String Table_Click = (jTable5.getModel().getValueAt(row,0).toString());
    String sql = "Select Ap.Appointment_ID,Ap.Doc_ID,(Ut.First_Name) As Doc_FirstName,Ut.Middle_Name As Doc_MiddleName,Ut.Last_Name As Doc_LastName,Ap.Department_ID,Dt.Department_Name,Ap.Patient_ID,Pr.First_Name,Pr.Middle_Name,Pr.Last_Name,Ap.SchedDate,Ap.Description,Ap.App_Date_Registered from Appointment_Table As Ap\n" +
                     "inner join User_Table As Ut on Ap.Doc_ID=Ut.ID\n" +
                     "inner join Patient_Records As Pr on Ap.Patient_ID=Pr.Patient_ID\n" +
                     "inner join Department_Table As Dt on Ap.Department_ID=Dt.Department_ID\n" +
                     "where Appointment_ID = '"+Table_Click+"'";
    pst = conn.prepareStatement(sql);
    rs = pst.executeQuery();

    if (rs.next()) {
        String add0 = rs.getString("Appointment_ID");
        AppointmentID.setText(add0);
        String add1 = rs.getString("Department_Name");
        DoctorDep_Update.setSelectedItem(add1);
        String add2 = rs.getString("Doc_FirstName");
        DoctorName_Update3.setText(add2);
        ....
    }
} catch(Exception e) {
    JOptionPane.showMessageDialog(null, e);
} finally {
    try {
        rs.close();
        pst.close();
    } catch(Exception e) {

    }

}

当我放

String add2 = rs.getString("Doc_FirstName");
DoctorName_Update3.setText(add2);

出现错误，我认为我的查询中有一些错误，但我无法解决它..当我尝试在 SQlite 浏览器上运行它时，结果显示

异常

java.sql.SQLException: ResultSet closed
at org.sqlite.RS.checkOpen(RS.java:57)
at org.sqlite.RS.findColumn(RS.java:103)
at org.sqlite.RS.getString(RS.java:247)
at Portal.ReceptionistPortal.Update_AppointmentsActionPerformed(ReceptionistPortal.java:7912)
at Portal.ReceptionistPortal.access$1900(ReceptionistPortal.java:32)
at Portal.ReceptionistPortal$24.actionPerformed(ReceptionistPortal.java:2256)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$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:6539)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6304)
at java.awt.Container.processEvent(Container.java:2239)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4535)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
at java.awt.Container.dispatchEventImpl(Container.java:2283)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
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:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
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)

它说错误发生

String add2 = rs.getString("Doc_FirstName");
DoctorName_Update3.setText(add2);

Answer 1

尝试如下设置 sql 字符串:

String sql = " .... where Appointment_ID = ? "

然后使用PreparedStatement的setString方法来设置你的参数:

pst.setString(1,Table_Click);
rs = pst.executeQuery();