android - 如何从android中的表中删除一行？

Question

这是 Handler 类中使用的删除方法 m：

    public void deleteRow(long rowId){
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CONTACTS, KEY_ID + "=" + rowId, null);
  }

1. 我想从列表视图中删除选定的行。这是我的 ListView 代码，它在 logcat 中没有显示任何错误，但没有删除该行。！可能是什么问题？：

   listView.setOnItemClickListener(new OnItemClickListener() {
       public void onItemClick(AdapterView<?> parent, View view,
               final int position, long id) {
           TextView textView = (TextView) view
                   .findViewById(android.R.id.text1);
           String s = textView.getText().toString();
   
   
           AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                   context);
           alertDialogBuilder.setTitle("Delete?");
           alertDialogBuilder
                   .setMessage("Click yes to delete")
                   .setCancelable(false)
   
                   .setNegativeButton("No",
                           new DialogInterface.OnClickListener() {
   
                               public void onClick(DialogInterface dialog,
                                       int which) {
                                   // TODO Auto-generated method stub
                                   dialog.cancel();// close the dialog and
                                                   // do nothing..
                               }
                           })
                   .setPositiveButton("Yes",
                           new DialogInterface.OnClickListener() {
   
                               public void onClick(DialogInterface dialog,
                                       int which) {
   
   
                                   // TODO Auto-generated method stub
   
                                   db = new SQLiteHandler(context);
                                   db.open();
                                   db.deleteRow(position);
                                   db.close();
   
                               }
                           });
   
           // create alert dialog
           AlertDialog alertDialog = alertDialogBuilder.create();
   
           // show it
           alertDialog.show();
       }
   });
   

Answer 1

    Try this:

    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CONTACTS, KEY_ID + "= ?"  , new String[] { ""+rowId });

Answer 2

db.delete(TABLE_CONTACTS, KEY_ID + "=?", new String[] {String.valueOf(rowId)});