Sqlite에서 마지막 기록을 얻는 방법?

Sqlite에서 마지막 기록을 얻는 방법?

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나는 하나의 테이블 question_table과 하나 ImageButton( 뒤로 )가 있습니다. 뒤로를 클릭 한 후 데이터베이스에서 마지막으로 삽입 된 레코드를 가져와야 합니다.

내 행이 다음과 같은 열이 포함되어 : question, optionA, optionB, optionC, optionD, 나는 내에서 사용하기위한 데이터가 필요 Activity. 데이터베이스에 한 가지 방법을 만들었지 만 작동하지 않습니다.

다음은 참조 용 코드입니다.

MySQLiteHelper.java 추출 :

public List<ObjectiveWiseQuestion> getLastInsertQuestion()
{
    // long index = 0;
    List<ObjectiveWiseQuestion>LocwiseProfileList=new ArrayList<ObjectiveWiseQuestion>();
    db = getReadableDatabase();
    Cursor cursor = db.query(
            "sqlite_sequence",
            new String[]{"seq"},
            "name = ?",
            new String[]{TABLE_QUESTION},
            null,
            null,
            null,
            null );

    if (cursor.moveToFirst())
    {
        do {
            ObjectiveWiseQuestion owq= new ObjectiveWiseQuestion();

            owq.setQuestion(cursor.getString(2));
            owq.setOptionA(cursor.getString(3));
            owq.setOptionB(cursor.getString(4));
            owq.setOptionC(cursor.getString(5));
            owq.setOptionD(cursor.getString(6));
            owq.setCorrectOption(cursor.getString(7));
            LocwiseProfileList.add(owq);
        } while(cursor.moveToNext());

        db.close();
    }

    return LocwiseProfileList;
}

OnClickListner에서 AddQuestionActivity.java

imgBack.setOnClickListener( new View.OnClickListener() 
{                       
    @Override
    public void onClick(View v) 
    {
        msg();
        emptyFormField();

        try {
            final List<ObjectiveWiseQuestion> LocWiseProfile =  db.getLastInsertQuestion();       

            for (final ObjectiveWiseQuestion cn : LocWiseProfile)
            {   
                db=new MySQLiteHelper(getBaseContext());
                db.getWritableDatabase();
                txtQuestion.setText(cn.getQuestion());
                txtOptionA.setText(cn.getOptionA());
                txtOptionB.setText(cn.getOptionB());
                txtOptionC.setText(cn.getOptionC());
                txtOptionD.setText(cn.getOptionD());
                txtCorrectOption.setText(cn.getCorrectOption());
                db.close();
            }
        } catch(Exception e) {
            e.printStackTrace();
        }           
    }
});

힌트를주세요.

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이 시도:

SELECT * 
    FROM    TABLE
    WHERE   ID = (SELECT MAX(ID)  FROM TABLE);

또는

다음 솔루션을 사용할 수도 있습니다.

SELECT * FROM tablename ORDER BY 열 DESC LIMIT 1;

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정답이 약간 장황하다고 생각합니다.

SELECT * FROM table ORDER BY column DESC LIMIT 1;

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테이블에서 마지막 기록을 얻으려면 ..

 String selectQuery = "SELECT  * FROM " + "sqlite_sequence";
 Cursor cursor = db.rawQuery(selectQuery, null);
  cursor.moveToLast();

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I think it would be better if you use the method query from SQLiteDatabase class inseted of the whole SQL string, which would be:

 Cursor cursor = sqLiteDatabase.query(TABLE, allColluns, null, null, null, null, ID +" DESC", "1");

The last two parameters are ORDER BY and LIMIT.

You can see more at: http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html

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If you have already got the cursor, then this is how you may get the last record from cursor:

cursor.moveToPosition(cursor.getCount() - 1);
//then use cursor to read values

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Here's a simple example that simply returns the last line without need to sort anything from any column:

"SELECT * FROM TableName ORDER BY rowid DESC LIMIT 1;"       

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Just simple, you can move with Cursor moveToLast(); method provides to move to the last record

cursor.moveToLast();

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I wanted to maintain my table while pulling in one row that gives me the last value in a particular column in the table. I essentially was looking to replace the LAST() function in excel and this worked.

, (Select column_name FROM report WHERE rowid = (select last_insert_rowid() from report))

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Suppose you are looking for last row of table dbstr.TABNAME, into an INTEGER column named "_ID" (for example BaseColumns._ID), but could be anyother column you want.

public int getLastId() {
    int _id = 0;
    SQLiteDatabase db = dbHelper.getReadableDatabase();
    Cursor cursor = db.query(dbstr.TABNAME, new String[] {BaseColumns._ID}, null, null, null, null, null);

    if (cursor.moveToLast()) {
        _id = cursor.getInt(0);
    }

    cursor.close();
    db.close();
    return _id;
}

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in sqlite, there is a table called sqlite_sequence, this table contains the table name and it's last id number (if the id is auto incremented).

So, to get the last row in a table just put :

Select * from TABLENAME where id=(SELECT * from sqlite_sequence where name ='TABLENAME')

참고URL : https://stackoverflow.com/questions/9902394/how-to-get-last-record-from-sqlite