Question

               echo'
               <ul class="nav navbar-nav navbar-right">
               <li><a href="index.html">HOME</a></li>
               <li><a href="itsupport.html">TEAM</a></li>
               <li class="dropdown">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">SERVICES <span class="caret"></span></a>
               <ul class="dropdown-menu" role="menu">
                 <li><a href="itservices.html">IT SERVICES</a></li>
                 <li><a href="voiceservices.html">VOICE SERVICES</a></li>
                 </li>
                 </ul>
                </li>
                      <li><a href="careers.html">CAREERS</a></li>
                      <li><a href="careers.html">INTERESTING INFORMATION</a></li>
                      <li><a href="contact.html">CONTACT</a></li>
                      </ul>';

我在mysql DB中有表作者和发布者。他们都有ISBN 专栏。然后我发出一个调用（通过php）到存储过程它包含以下代码：

if(!$this->MakeProcedure("StupidProcedure", "OUT msg VARCHAR(25)" )){
            echo "could not create procedure";
  }

if(!$this->db->query("SET @msg = ''") || !$this->db->query("CALL StupidProcedure(@msg)")){
          echo "CALL to StupidProcedure  failed:";
}  else   {
    $res= $this->db->query("SELECT @msg as _p_out");
     $row = $res->fetch();
                echo $row['_p_out']." counted columns ";
}

基本上，我希望上面的代码段返回2作为计数表的数量有共同的ISBN列（反映在计数变量中）。不幸，尽管多次检查，但是计数总是返回0 - 检查ISBN列是什么那里（用phpmyadmin）。为什么count（*）表现得很奇怪？或者在那里我必须设置一个特殊的.ini配置吗？

这是我的测试驱动程序：

非常感谢任何帮助。

Answer 1

哇！终于我明白了。这是执行脏修复的sql代码片段：

＆＃13;

BEGIN   
DECLARE count int; 
                    SELECT count(1)
                    FROM information_schema.columns
                    WHERE table_name IN ('authors', 'publishers')
                    AND column_name = 'ISBN'
                    AND table_schema = 'test'   
                    INTO count;
                    SELECT count INTO msg;      /*just to debug counter*/
END
//PRINT ‘Thank you guys !’

＆＃13;

Mysql count（*）让我失望

1 个答案: