Question

I am trying to fetch data from SQLite database(NSArray of strings) and populate the contents in table view cells. I tried to execute the query in command prompt and it works fine. But in code, it returns an empty array.

NSString *temp = [[NSString alloc]initWithFormat:@"select img.image from images img,illness i,illness_images ii where img.img_id=ii.img_id and i.i_id=ii.i_id and i.i_id = '%d'",illid];
        const char *sqlStatement = [temp UTF8String];
        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) 
        {
            // Loop through the results and add them to the array
            while(sqlite3_step(compiledStatement) == SQLITE_ROW) 
            {
                // Read the data from the result row
                NSString *imgname = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];

                [imglist addObject:imgname];
                sqlite3_finalize(compiledStatement);

            }
        }
        else{
            NSAssert1(0,@"Error retrieving image names '%s'",sqlite3_errmsg(database));
        }

I tried to debug and when it reaches while(sqlite3_step(compiledStatement) == SQLITE_ROW) , it does not enter the loop.
Not sure whats the mistake I am doing.

Thanks!

Answer 1

Try NSLog after assigning the string query to temp variable.
and check if the variable illid is giving you the correct value and run that query on the database directly.

NSString *temp = [NSString stringWithFormat:@"select img.image from images img,illness i,illness_images ii where img.img_id=ii.img_id and i.i_id=ii.i_id and i.i_id = %d",illid];

and you better release the allocated object or use class methods setting value, for memory management.

HTH.