Instruments表示此方法存在内存泄漏，但我不知道在哪里

    cat.catName = (catName)?[NSString stringWithUTF8String:catName]:@\"\";
    NSData *dataForCachedImage = [[NSData alloc] initWithBytes:sqlite3_column_blob(statement, 2) length: sqlite3_column_bytes(statement, 2)];           
    cat.catThumb = [UIImage imageWithData:dataForCachedImage];
    [dataForCachedImage release];

-(NSMutableArray *)getAllItems{
NSMutableArray *items = [[[NSMutableArray alloc] init] autorelease];

const char *sql = \"SELECT * FROM category ORDER by sort\";

sqlite3_stmt *statement;

int sqlresult = sqlite3_prepare(database, sql, -1, &statement, nil);

if (sqlresult == SQLITE_OK) {
    while (sqlite3_step(statement) == SQLITE_ROW) {
        Category *cat = [[Category alloc] init];

        char *catName = (char *)sqlite3_column_text(statement, 1);

        cat.catID = sqlite3_column_int(statement, 0);
        cat.catName = (catName)?[NSString stringWithUTF8String:catName]:@\"\";
        NSData *dataForCachedImage = [[NSData alloc] initWithBytes:sqlite3_column_blob(statement, 2) length: sqlite3_column_bytes(statement, 2)];           
        cat.catThumb = [UIImage imageWithData:dataForCachedImage];
        [dataForCachedImage release];
        cat.catLock = sqlite3_column_int(statement, 3);
        cat.sort = sqlite3_column_int(statement, 4);
        cat.total = [self totalSMS:cat.catID];

        [items addObject:cat];

        [cat release];
    }
    sqlite3_finalize(statement);
}

else
{
    NSLog(@\"problem with the database\");
    NSLog(@\"%d\",sqlresult);
}
return items;}