Question

I’ve written the following DB query.
However, the app crashes when I access the list activity that displays the results.

I’ve traced the error to the method below (other simpler query methods work just fine):

public Cursor fetchInterface_HSE_Entries(String string) throws SQLException{
    String[] columns = new String[] {KEY_ROW_ID_INTERFACE, KEY_TEXTVIEW_VALUE, KEY_CATEGORY_OPTIONS, KEY_WORKSCREEN};
    String whereClause = KEY_WORKSCREEN+"=" + string;
    Cursor cursor = db.query(TEXTVIEWS_TABLE, columns, whereClause, null, null, null, null);

    if(cursor != null){
        cursor.moveToFirst();
    }
    return cursor;
}

And this is part of my error log:

12-31 16:13:38.851: E/AndroidRuntime(480): Caused by: android.database.sqlite.SQLiteException: no such column: testInterface1: , while compiling: SELECT _id, textviewvalue, categoryoptions, workscreen FROM interfacetable WHERE workscreen=testInterface1

Answer 1

Try with:

String whereClause = KEY_WORKSCREEN+"='" + string + "'";

You need to quote text values in your queries, otherwise they will be interpreted as column names (or functions, or whatever).

Note that this is not safe against SQL Injection attacks, you should be using bind variables.

String whereClause = KEY_WORKSCREEN+" = ?";
Cursor cursor = db.query(TEXTVIEWS_TABLE, columns, whereClause, 
                         new String[]{string}, null, null, null);