Question

While Executing SQLITE with SELECT statement and having COUNT (*) to count the total number of that column, gives me EXC_BAD_ACCESS.
It sends me the error while adding an array from one array to other. No idea why it does that but has anybody come across such issues can help around ?

-(void) title{

self.array = [[[NSMutableArray alloc] init] autorelease];
const char *query_stmt = "SELECT DISTINCT ID, KEY, COUNT (*)  FROM TEST GROUP BY KEY";
if (sqlite3_prepare_v2(database, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
    while(sqlite3_step(statement) == SQLITE_ROW)
    {
        NSString *ID = [NSString stringWithUTF8String:(char *) sqlite3_column_text(exhProduct_statement, 0)];
        NSString *KEY = [NSString stringWithUTF8String:(char *) sqlite3_column_text(exhProduct_statement, 1)];
        NSUInteger taskCount=  sqlite3_column_int(exhProduct_statement, 2);
        NSMutableArray *taskArray=[[NSMutableArray alloc]initWithObjects:ID, KEY, taskCount,nil] ; <--- Error

        [self.array addObject:taskArray];
    }
    sqlite3_finalize(statement);        
}       
}

Answer 1

You need to change the NSUInteger into an NSNumber:

    NSMutableArray *taskArray=[[NSMutableArray alloc]initWithObjects:ID, KEY, [NSNumber numberWithUnsignedInteger:taskCount],nil] ;

You can later retrieve the value using

    NSUInteger *retrievedTaskCount = [[taskArray objectAtIndex:2] unsignedIntegerValue];

The reason for this is that an NSArray stores NSObjects, so any time that you have an int, float, NSInteger, NSUInteger, etc, that you wish to store in an NSArray or NSMutableArray, you will need to convert it into an object. NSNumber is a class build just for this.