CODEWITHSUNDEEP
androidsqlite
HB.
HB.

Reputation: 4236

SQlite returns 0

Let me start of by explaining how I insert and return data from SQLite.

First I create the table like this:

private static final String CREATE_TABLE_STUDENT_LESSON = " create table STUDENTSPECIFICLESSON ( _id TEXT , _viewID INTEGER PRIMARY KEY AUTOINCREMENT , _LESSON_TITLE TEXT , _LESSON_DATE TEXT , _LESSON_PROBLEM TEXT );";

public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_TABLE_STUDENT_LESSON);
}

Then I insert into the table like this in SQLite:

public void insertLesson(String _id, String lessonTitle, String lessonDate, String lessonProblem) {
    ContentValues contentValue = new ContentValues();
    contentValue.put(SQLiteHelper._ID, _id);
    contentValue.put(SQLiteHelper.LESSON_TITLE, lessonTitle);
    contentValue.put(SQLiteHelper.LESSON_DATE, lessonDate);
    contentValue.put(SQLiteHelper.LESSON_PROBLEM, lessonProblem);
    this.getWritableDatabase().insert(SQLiteHelper.TABLE_NAME_STUDENTSPECIFICLESSON, null, contentValue);
}

And I insert it from the Activity like this:

sqLiteHelper.insertLesson(id,etLessonTitle.getText().toString(),currentDateandTime,etLessonProbStu.getText().toString());

You will notice that I have created _viewID INTEGER PRIMARY KEY AUTOINCREMENT I'm using this to get the specific ViewHolder in my Adapter.

I get this _viewID by doing this:

public String getLessonViewHolderID(String _path){
    String id = null;

    Cursor cursor = getReadableDatabase().rawQuery("Select "+SQLiteHelper._viewID+" from "+SQLiteHelper.TABLE_NAME_STUDENTSPECIFICLESSON+" Where "
            +SQLiteHelper.LESSON_TITLE +"='"+_path+"'",null);

    if (cursor != null) {
        cursor.moveToFirst();
    }
    if (cursor == null) {
    } else if (cursor.moveToFirst()) {
        do {
            id = String.valueOf(cursor.getInt(cursor.getColumnIndex(SQLiteHelper._viewID)));

        } while (cursor.moveToNext());
        cursor.close();
    } else {

    }
    return id;
}

This works perfectly and returns the _viewId correctly as expected.

I then try to get _LESSON_PROBLEM from SQLite by doing this:

public String getLessonProblem(String _id){


    String id = null;

    Cursor cursor = getReadableDatabase().rawQuery("Select _LESSON_PROBLEM from "+SQLiteHelper.TABLE_NAME_STUDENTSPECIFICLESSON+" Where "
            +SQLiteHelper._viewID +"='"+_id+"'",null);


    if (cursor != null) {
        cursor.moveToFirst();
    }
    if (cursor == null) {
    } else if (cursor.moveToFirst()) {
        do {
            id = String.valueOf(cursor.getInt(cursor.getColumnIndex("_LESSON_PROBLEM")));

        } while (cursor.moveToNext());
        cursor.close();
    } else {

    }
    return id;

}

and from my Adapter I call:

String lessonProblem = helper.getLessonProblem(viewId);

The above String lessonProblem will then return 0.

I have checked my database and all the data is inserted correctly, here is a image of my database:

myDatabase

I can't understand why it is returning 0 when clearly it is not, can someone please help me point out what the issue may be?

Upvotes: 3

Views: 1440

Answers (2)

IntelliJ Amiya
IntelliJ Amiya

Reputation: 75798

Sloppy mistake. You should use getString() instead of getInt().

Returns the value of the requested column as a String. The result and whether this method throws an exception when the column value is null or the column type is not a string type is implementation-defined.

Finally

cursor.getString(cursor.getColumnIndex("_LESSON_PROBLEM"));

Upvotes: 7

laalto
laalto

Reputation: 152927

id = String.valueOf(cursor.getInt(cursor.getColumnIndex("_LESSON_PROBLEM")));

You're getting a string value as an int and then converting that to a string. Change that to something like

id = cursor.getString(cursor.getColumnIndex("_LESSON_PROBLEM"));

Upvotes: 5

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