[SOLVED] mysql_use_result returns NULL but no error set?
Posted by: Daniel Chiaramello
Date: October 16, 2012 01:08AM

Hello.

I apologize, I was fooled by a C++ embedding around my requests...

  template <MYSQL_RES* (*MySQLCall)(MYSQL*)>
  class ScopedCall
  {
    public:
      ScopedCall(MYSQL* mysql, MYSQL_RES*& res) : res_(res)
      {
        res = MySQLCall(mysql);
      }

      ~ScopedCall() { release(); }

      void release() throw() { mysql_free_result(res_); res_ = 0; }

    private:
      ScopedCall(const ScopedCall&);
      ScopedCall& operator=(const ScopedCall&);

      MYSQL_RES*& res_;
  };

  ScopedCall<mysql_use_result>(mysql,res);
  if (res == NULL)
  {
    MM_REPORT("ERROR: '%s'\n", mysql_error(mysql));
    return;
  }

Unfortunately, the usage of ScopedCall was incorrect, it should have been written as:
ScopedCall<mysql_use_result> queryResult(mysql,res);

So, nothing to do with MySQL there...

Sorry for noise,
Daniel

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[SOLVED] mysql_use_result returns NULL but no error set?
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October 16, 2012 01:08AM


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