问无法更新数据库列-目标C

EN

-(void)updateID:(NSString*)ID{
    NSString *queryInsertAndUpdate =
    [NSString stringWithFormat:
     @"UPDATE mytable set ID = '%@' limit 1",ID];

    const char* query=[queryInsertAndUpdate UTF8String];
    sqlite3_stmt *stmt = nil;

    sqlite3_exec(_database, "BEGIN EXCLUSIVE TRANSACTION", 0, 0, 0);

    if (sqlite3_prepare_v2(_database, query, -1, &stmt, NULL) == SQLITE_OK) {
        if(sqlite3_step(stmt) == SQLITE_DONE) {
            NSLog(@"Query Executed");
        } else {
            NSLog(@"Query NOT Executed: %s", sqlite3_errmsg(_database));
        }
        sqlite3_finalize(stmt);

    }else{
        NSLog(@"Statement NOT Prepared: %s", sqlite3_errmsg(_database));
    }
}

AppDelegate* appDelegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
[appDelegate initViewController];