php - mysql中的链接资源不稳定

Question

同一个mysql资源可以用于多个查询吗？

 $queries=array($q1, $q2);
 $link=mysql_connect(...);
 mysql_select_db(...);

 for($i = 0; $i < count($queries); $i++) {

      echo "Link is of type " . gettype($link) . "<br />";

      if(is_resource($link)) {
           mysql_query($queries[$i], $link);
      } else {
           echo "Did not execute query. <br/>";
      }
 }

 disconnect($link);

输出:

link is of type resource
Successfully executed query
link is of type resource
Did not execute query.

编辑:我想从输出中指出第一个查询执行但第二个查询不执行。在这两者之间，链接没有变化。查询的执行方式也无关紧要(恕我直言)。

编辑 2:我的确切代码如下:

$link = mysql_connect("localhost", ........);
mysql_select_db(....);

for ($row = 0; $row < $numRows; $row++) {
    if (($query = buildQuery($mainArr, $rowArr, $row)) === null) {
        echo "Error - could not build query. <br />";
        return;
    }

    echo "Link is of type " . gettype($link) . "<br />"; 

    if (is_resource($link)) {
        if ((mysql_query($query, $link))) {
            if($debug) {
                echo "Successfully executed query <br />";
            }
        } else {
            if ($debug) {
                echo "This comes up when row is " . $row . "<br />";
                echo "Link is of type " . gettype($link) . "<br />";
                echo "Datawrite failed - " . $query . "<br />";
                echo "the official line is " . mysql_error($link) . "<br />";
            }
        }
    } else {
        echo "Did not execute query <br />";
    }
}

disconnect($link);

Answer 1

for 循环的每次迭代都包含对 buildQuery() 的调用(此处未显示)。它会以某种方式影响 $link，还是会改变 $debug 的值？

此外，您的循环引用了此处未定义的 $numRows。循环执行了多少次？