无法从光标中检索自动增量字段

Question

我创建了一个sqlite数据库。我正在显示数据库中的名称，图像和描述，并成功地将它们绑定在listview中。但是我无法从表中检索自动增量字段（cardid）。 / p>

以下是代码1：

 lvcard.setOnItemClickListener(new OnItemClickListener() {

  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                                long arg3) {
  // TODO Auto-generated method stub
  if(cursor!=null){

  if(cursor.moveToFirst()){
  cursor.moveToPosition(position);   
  String cardid = ""+cursor.getInt(cursor.getColumnIndex("cardid"));
  Toast. makeText(CardList.this,"cardid--->"+cardid,Toast.LENGTH_LONG).show();
           }
         }
        }
});

这是堆栈跟踪：

11-06 15:01:54.579: E/AndroidRuntime(20071): FATAL EXCEPTION: main
11-06 15:01:54.579: E/AndroidRuntime(20071): java.lang.IllegalStateException: get field slot from row 3 col -1 failed
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.database.CursorWindow.getLong_native(Native Method)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.database.CursorWindow.getInt(CursorWindow.java:465)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.database.AbstractWindowedCursor.getInt(AbstractWindowedCursor.java:124)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at com.webguru.india.ctp.CardList$1.onItemClick(CardList.java:64)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.widget.AdapterView.performItemClick(AdapterView.java:315)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.widget.ListView.performItemClick(ListView.java:3570)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:1862)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.os.Handler.handleCallback(Handler.java:618)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.os.Handler.dispatchMessage(Handler.java:123)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.os.Looper.loop(SourceFile:351)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at android.app.ActivityThread.main(ActivityThread.java:3826)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at java.lang.reflect.Method.invokeNative(Native Method)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at java.lang.reflect.Method.invoke(Method.java:538)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:969)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:727)
11-06 15:01:54.579: E/AndroidRuntime(20071):    at dalvik.system.NativeStart.main(Native Method)

代码2： 在这里我删除了cursor.getColumnIndex（＆＃34; cardid＆＃34;）和手动插入columindex ，如：

lvcard.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                                    long arg3) {
      // TODO Auto-generated method stub
      if(cursor!=null){

      if(cursor.moveToFirst()){
      cursor.moveToPosition(position);   
      String cardid = ""+cursor.getInt(3);
      Toast. makeText(CardList.this,"cardid--->"+cardid,Toast.LENGTH_LONG).show();
               }
             }
            }
    });

但它没有返回id ，而是撤回名为＆＃34; cardcode＆＃34;的字段。

这是我的 sqlite数据：

这是数据结构：

任何人都可以指出我正在做的错误吗？

Answer 1

您的Cursor不包含cardid列，getColumnIndex()返回-1。检查查询时使用的投影。