MySql variables and php

Question

I am getting an error with this in php. What is the correct way to format this string to pass to mysql_query() in php?

SELECT count(*) FROM agents INTO @AgentCo         


        

Answer 1

If you are using mysql_query, then yes, you need to send each query separately. From the description at the top of mysql_query's entry in the PHP manual: "mysql_query() sends a unique query (multiple queries are not supported) to the currently active database..."

As for subqueries, you'd be surprised; the query optimizer generally handles them very well.

Answer 2

You can only have one query at a time in PHP.

 $query1 = "SELECT count(*) FROM agents INTO @AgentCount"
 $query2="  
  SELECT user_agent_parsed, user_agent_original, COUNT( user_agent_parsed ) AS thecount, 
  COUNT( * ) / ( @AgentCount) AS percentage
  FROM agents
  GROUP BY user_agent_parsed
  ORDER BY thecount DESC LIMIT 50";

UPDATE

I have a DAL that contains all my queries. A typical function in my DAL looks like this:

// These functions are reusable 
  public function getAllRows($table)
  {
    $sql =" SELECT * FROM $table";
    $this->query($sql);
    return $this->query_result;       
  }

Then in my BLL (Business Layer) I have the following:

  public function getUserAgents()
  {
      $result = parent::getAllRows();
      $row = mysql_fetch_array($result);
      return $row[0]; // Retrieves the first row

      // Then you take this value and to a second request. Then return the answer / rows.
  }