PHP `mysqli_multi_query` 不能返回值

问题描述

一个简单的例子

$connection = MysqLi_connect("domain","user","psw","db");
$response = MysqLi_multi_query($connection,"
    SET @a = 'foo';
    SET @b = 'bar';
    SELECT @a AS A,@b AS B
");

var_dump(MysqLi_field_count(connection));
var_dump(MysqLi_use_result($connection));
var_dump(MysqLi_store_result($connection));
var_dump(MysqLi_more_results($connection));
var_dump(MysqLi_next_result($connection));

退货（美化）

int(0)
bool(false)
bool(false)
bool(true)
bool(true)

怎么了？我只是误解了如何从 MysqLi_multi_query 获取值吗？ 为什么它在 0 中返回 MysqLi_field_count？ 如果出现语法错误，如何获取其编号或描述？

提前致谢！

解决方法

不要使用mysqli_multi_query()。每个查询都应该单独发送到服务器。

这样做：

$response1 = mysqli_query($connection,"SET @a = 'foo'");
$response2 = mysqli_query($connection,"SET @b = 'bar'");
$response3 = mysqli_query($connection,"SELECT @a AS A,@b AS B");
$row = mysqli_fetch_assoc($response3);