AFHTTPRequestOperationManager中的调用方法

Question

我在我的网络服务中获取数据后尝试更新我的数据库，但它不起作用，我不知道为什么......这里我的代码..

 - (void) getCurrentVersion {
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    [manager GET:@"http://www.sample.com/api/getdata"
      parameters:nil
         success:^(AFHTTPRequestOperation *operation, id responseObject){
             NSDictionary *versionJson = (NSDictionary *)responseObject;
             networkBase = [versionJson objectForKey:@"NetworkBase"];
             baseVersion = [versionJson objectForKey:@"Version"];
             [db insertData:networkBase withVersion:baseVersion];
             NSLog(@"getCurrentVersion %@ %@",networkBase,baseVersion);
         }
         failure:^(AFHTTPRequestOperation *operation, NSError *error){
             NSString *errorMessage = [error localizedDescription];
             NSLog(@"%@",errorMessage);

         }];


}

这里是db

的代码

 - (void)insertData:(NSString *)networkBase withVersion:(NSString *)version{
    const char *dbpath = [self.databasePath UTF8String];
    sqlite3_stmt    *statement2;

    if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK) {
        NSString *insertSQL = [NSString stringWithFormat:@"UPDATE version SET message = '%@', storeversion = '%@' WHERE id = 1",networkBase,version];
        const char *insert_stmt = [insertSQL UTF8String];

        if (sqlite3_prepare_v2(_contactDB, insert_stmt, -1, &statement2, NULL) == SQLITE_OK) {

            if (sqlite3_step(statement2) == SQLITE_DONE ) {
                NSLog(@"Inserting Success!");
            }
            else{
                NSLog(@"%s",sqlite3_errmsg(_contactDB));
            }

        }
            }
    sqlite3_finalize(statement2);
    sqlite3_close(_contactDB);

}

所以我的问题在于这一行

[db insertData:networkBase withVersion:baseVersion];
NSLog(@"getCurrentVersion %@ %@",networkBase,baseVersion);

它执行NSLog但不执行[db insertdata]