＆＃34; java.lang.IllegalStateException：尝试重新打开已经关闭的对象＆＃34; SQLite的

Question

我有SQLite命令这个问题。我正在尝试使用字符串进行查询，您可以在代码中看到。但我一直在犯这个错误。

public List<SignUpPOJO> fetchSignUpDetails(int value) {
        this.open();
        Cursor cursor = db.rawQuery(GET_TEACHER_DETAILS + value, null);
        List<SignUpPOJO> list = new ArrayList<SignUpPOJO>();
        while (cursor.moveToFirst()) {
            do {
                SignUpPOJO pojo = new SignUpPOJO();
                pojo.setName(cursor.getString(0));
                pojo.setDepartment(cursor.getString(1));
                pojo.setClass_(cursor.getString(2));
                pojo.setSubject(cursor.getString(3));
                list.add(pojo);
            } while (cursor.moveToNext());
            cursor.close();
            db.close();
        }
        return list;
    }

帮助将不胜感激。

Answer 1

自己解决了！只是评论了几行和瞧！

public List<SignUpPOJO> fetchLoginDetails(String value) {
        this.open();
        db = getReadableDatabase();
        Cursor cursor = db.rawQuery(GET_USER_PASS + "'" + value + "'", null);
        List<SignUpPOJO> list = new ArrayList<SignUpPOJO>();
        // while (cursor.moveToFirst()) {
        // do {
        cursor.moveToNext();
        SignUpPOJO pojo = new SignUpPOJO();
        pojo.setName(cursor.getString(0));
        pojo.setPassword(cursor.getString(1));
        list.add(pojo);
        // } while (cursor.moveToNext());
        cursor.close();
        db.close();
        // }
        return list;
    }

基本上，我正在使用仅返回一个结果的_name查询。