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我有一個「經理」類，也有一個框架是「報告」。在框架中我有三個單選按鈕，其文本是「1970年以前」，「1970年至2000年」，「2000年以後」以及如果選擇其中一個，在這些單選按鈕下面的文本字段中，我將顯示具有這種情況的行數在我的SQL表中。同樣，在我的SQL表中，我創建了一個具有名稱，系列，父名，motherName，dateOfBirth，placeOfBirth，也是第一列是自動創建的ID。dateOfBirth列中的文本就像「2009年12月5日」，我只需要一年！但是當我運行這段代碼時，這些堆棧跟蹤將顯示在控制檯中，爲什麼？請幫幫我。爲什麼它返回SQL異常？
我Manager類（只是其中的一部分）：
public static int getPercent(String i)throws SQLException{
Statement stmt = conn.createStatement();
List<String> list = null;
if(i.equals("O")){
ResultSet rst = stmt.executeQuery("SELECT dateOfBirth from birthtable");
while(rst.next()){
String s1 = rst.getString(6) ;
if(rst.wasNull()){
s1=null;
}
String s2 = s1.substring(s1.length()-4);
int s3 = Integer.parseInt(s2);
if(list ==null&& s3<1970){
list = new ArrayList<String>();
}
else{
list = new ArrayList<String>();
s2 = null;
}
list.add(s2);
}
}
if(i.equals("N")){
ResultSet rst = stmt.executeQuery("SELECT dateOfBirth from birthtable");
while(rst.next()){
String s1 = rst.getString(6) ;
if(rst.wasNull()){
s1=null;
}
String s2 = s1.substring(s1.length()-4);
int s3 = Integer.parseInt(s2);
if(list ==null&&s3>2000){
list = new ArrayList<String>();
}
else{
list = new ArrayList<String>(0);
s2 = null;
}
list.add(s2);
}
}
if(i.equals("H")){
ResultSet rst = stmt.executeQuery("SELECT dateOfBirth from birthtable");
while(rst.next()){
String s1 = rst.getString(6) ;
if(rst.wasNull()){
s1=null;
}
String s2 = s1.substring(s1.length()-4);
int s3 = Integer.parseInt(s2);
if(list ==null&&s3>1970&& s3<2000){
list = new ArrayList<String>();
}
else{
list = new ArrayList<String>(0);
s2 = null;
}
list.add(s2);
}
}
return list.size();
}
我的幀（只是那部分）：
private void range1ActionPerformed(java.awt.event.ActionEvent evt) {
int i = 0;
try {
i = Manager.getPercent("O");
} catch (SQLException ex) {
Logger.getLogger(BirthReport.class.getName()).log(Level.SEVERE, null, ex);
}
resulText.setText(i+"");
}
stacktarce：
Dec 17, 2009 7:57:48 AM AdminGUI.BirthReport range1ActionPerformed
SEVERE: null
java.sql.SQLException: Column Index out of range, 6 > 1.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
at com.mysql.jdbc.ResultSetImpl.checkColumnBounds(ResultSetImpl.java:792)
at com.mysql.jdbc.ResultSetImpl.getStringInternal(ResultSetImpl.java:5529)
at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5448)
at database.Manager.getPercent(Manager.java:1137)
at AdminGUI.BirthReport.range1ActionPerformed(BirthReport.java:152)
at AdminGUI.BirthReport.access$100(BirthReport.java:23)
at AdminGUI.BirthReport$2.actionPerformed(BirthReport.java:84)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:291)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
at java.awt.Dialog$1.run(Dialog.java:1039)
at java.awt.Dialog$3.run(Dialog.java:1091)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1089)
at java.awt.Component.show(Component.java:1419)
at java.awt.Component.setVisible(Component.java:1372)
at java.awt.Window.setVisible(Window.java:801)
at java.awt.Dialog.setVisible(Dialog.java:979)
at AdminGUI.BirthFrame.jButton1ActionPerformed(BirthFrame.java:190)
at AdminGUI.BirthFrame.access$300(BirthFrame.java:21)
at AdminGUI.BirthFrame$4.actionPerformed(BirthFrame.java:94)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
管理員類1137行發生了什麼？ – 2009-12-17 04:43:33
我明白了，[:-)]但是當選擇「1970年前的年份」時，它將返回「1」（我只有一行），但是這一年是2006年！ – Johanna 2009-12-17 04:57:03
哦，我得到我的錯誤，我設置s2 = null; – Johanna 2009-12-17 05:03:01