มีปัญหากับ sqlite database ครับ ถ้า จำลองลง iOS Device มันจะใช้ database ไม่ได้

NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSString* dbPath = [[NSBundle mainBundle] pathForResource:@"Mydatabase" ofType:@"sqlite"];
    BOOL success = [fileManager fileExistsAtPath:dbPath];
    sqlite3_stmt *selectstmt;
    if(!success)
    {
        NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Mydatabase.sqlite"];
        success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error];
        
        if (!success)
            NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
    
    if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
        //*************** insert value in database******************************\\
        
        const char *sql = [[NSString stringWithFormat:@"insert into description(id_trip,description) values('%d','%@')",_carryTrip,self.deScripTionName.text]UTF8String];
        sqlite3_prepare_v2(database,sql, -1, &selectstmt, NULL);
        if(sqlite3_step(selectstmt)==SQLITE_DONE)
        {
            NSLog(@"insert successfully");
        }
        else
        {
            NSLog(@"insert not successfully");
            
        }
        sqlite3_finalize(selectstmt);
        sqlite3_close(database);
    }