Question

我在php上有一个数组，其中包含我想要检索的记录的一些ID，我用循环执行该操作，多次执行查询以获取所有这些ID。

foreach ($receivers as $id) {

            $sth = $this->db->prepare("SELECT phone FROM contact WHERE idcontact = ?");

            $sth->execute(array($id));

            $res= $sth->fetch();
            echo $res['phone'] ;
            }

如何在单个查询中执行此操作，以便我不会在数百个查询中打扰数据库？

Answer 1

$sth = $this->db->prepare("SELECT phone FROM contact WHERE idcontact IN (" . implode(",",$receivers) . ")");

来源：http://www.w3resource.com/mysql/comparision-functions-and-operators/in-function.php

更好的来源：http://dev.mysql.com/doc/refman/5.0/en/any-in-some-subqueries.html

Answer 2

您可以将IN()谓词与查询参数一起使用：

$placeholders = implode(",", array_fill(1, count($receivers), "?"));

$sth = $this->db->prepare("SELECT phone FROM contact WHERE idcontact IN ($placeholders)");

$sth->execute($receivers);

PHP MySQL如何检索在单个查询中匹配多个不同值的记录

2 个答案: