为什么我会看到此错误：没有这样的列：number（代码1）：，而在编译时：从Users_Table中删除，其中where number =？

Question

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尝试从ListView和数据库中删除项目时出现此错误，我该如何解决？谢谢这是方法：

public int deleteSelectedItem(String number) {
    SQLiteDatabase db = this.getWritableDatabase();
    int result = db.delete( DB_TABLE, "number = ?", new String[] {number} );
    return result;
    }

这是电话：

 userlist.setOnItemLongClickListener( new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick (AdapterView<?> arg0, View view, final int position, long arg3) {
            AlertDialog.Builder alertDialog = new AlertDialog.Builder( MainActivity.this );
            alertDialog.setTitle( "Elimina" );
            alertDialog.setMessage( listItem.get( position ) );
            alertDialog.setPositiveButton( "Elimina", new DialogInterface.OnClickListener() {
                @Override
                public void onClick (DialogInterface dialog, int which) {
                 db.deleteSelectedItem( listItem.get( position ) );
                  }
            } );
            alertDialog.show();
            return true;
        }
    } );

Logcat：

android.database.sqlite.SQLiteException: no such column: number (code 1): , while compiling: DELETE FROM Users_Table WHERE number = ?
    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
    at android.database.sqlite.SQLiteDatabase.delete(SQLiteDatabase.java:1496)
    at com.example.listviewsqlite.DatabaseHelper.deleteSelectedItem(DatabaseHelper.java:54)
    at com.example.listviewsqlite.MainActivity$2$1.onClick(MainActivity.java:68)
    at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:163)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

谢谢！有了您的帮助，我解决了！ :)