FMDB executeupdate在调用时挂起

Question

我使用FMDB在obj-c中继续执行sqlite db，但每次调用executeupdate时都会挂起

BOOL isSuccess = YES;

[self openFMDB];
NSString* currentDatetime = [self getCurrentDatetime];

isSuccess = [fmDB executeUpdate:@"UPDATE liquors_list SET l_last_open = ? WHERE l_id = ?",[NSString stringWithFormat:@"%@",currentDatetime],[NSString stringWithFormat:@"%@",liquorID],Nil];

return isSuccess;