Question

我目前正在Android应用程序上完成我的最后一年项目。我试图创建一个登录模块，但它总是给我一个错误：

android.database.CursorIndexOutOfBoundsException：请求索引-1，大小为1

“size of 1”是我试图获得的用户数据;但是，我无法弄清楚从哪里开始。任何人都可以帮我解决这个问题吗？这是我的代码：

    Cursor c = agentDatabase.rawQuery("SELECT COUNT(username) FROM " + DATABASE_TABLE + " WHERE " + KEY_USERNAME + " = ? AND " +KEY_PASSWORD + " = ?", new String[]{user, pass});

    String result = "";

    if(c != null && c.moveToPosition(0)){
        //if (c.moveToFirst()){

            int r = c.getCount();

            if(r == 1){
                //Cursor d = agentDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_USERNAME + " = '" + user + "'", new String[]{ KEY_ROWID, KEY_NAME, KEY_EMAIL, KEY_USERNAME});

                Cursor d = agentDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_USERNAME + " = ?", new String[]{user});

                int iRow = d.getColumnIndex(KEY_ROWID);
                int iName = d.getColumnIndex(KEY_NAME);
                int iEmail = d.getColumnIndex(KEY_EMAIL);
                int iUser = d.getColumnIndex(KEY_USERNAME);

                result = result + d.getString(iRow) + " " + d.getString(iUser) + " " + d.getString(iName) + " " + d.getString(iEmail) + "\n";

            }
        //}
    }

    return result;
}

Answer 1

您应该在获取数据之前将光标移动到第一行

Cursor d = agentDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_USERNAME + " = ?", new String[]{user});
d.moveToFirst();

如果您只希望结果光标中有一行，这将有效，否则您可以使用d.move。

cursorindexoutofboundsexception

1 个答案: