Question

How do I retrieve the data on all columns from an INNER JOIN result? I use this query:

SELECT course.course_title, 
       course.course_body, 
       course. course_image, 
       instructor.instructor_title, 
       instructor.instructor_body, 
       instructor.instructor_photo
FROM  course
INNER JOIN instructor
ON  course.course_instructor1=instructor.instructor_nid
WHERE course_id=4

and this is the equivalent variable COURSE_OUTLINE that i’ll be using to execute

String COURSE_OUTLINE = 
        "SELECT " + Qualified.COURSE_TITLE + ", " 
                  + Qualified.COURSE_BODY + ", " 
                  + Qualified.COURSE_IMAGE + ", "
                  + Qualified.INSTRUCTOR_TITLE + ", "
                  + Qualified.INSTRUCTOR_BODY + ", "
                  + Qualified.INSTRUCTOR_IMAGE + ", " +
        "FROM "   + Tables.COURSE_JOIN_INSTRUCTOR +
        "WHERE "  + CourseColumns.COURSE_ID + 
        "=?";

In my code,

Cursor cur = mSqliteDb.rawQuery(SubQuery.COURSE_OUTLINE, new String[] {position});

This gives 1 record. I know how to retrieve data from a specific column but I’m not sure how to retrieve it from all columns.

this is the code I use to retrieve data from a specific column

public String getCourseImage(int position) {
    String image = "";
    String pos = Integer.toString(position);

    Cursor cur = mSqliteDb.rawQuery(SelectQuery.ALL_COURSES, new String[] {pos});
    if (cur != null) {
        if (cur.moveToFirst()) {
            do {
                image = cur.getString(cur.getColumnIndex(CourseColumns.COURSE_IMAGE)); 
            } while (cur.moveToNext());
        }
        cur.close();
    }
    return image;
}

My intention is mapping each data in a column to a View

Answer 1

getColumnNames gives you an array with all columns… if that’s what you’re asking. It’s kind of hard to tell.