PHP `mysqli_multi_query` 不能 return 值

Question

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));

Returns（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？为什么在 mysqli_field_count 中 return 0？如果有语法错误，我怎样才能得到它的编号或描述？

提前致谢！

Answer 1

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);

PHP `mysqli_multi_query` 不能 return 值

PHP `mysqli_multi_query` cannot return a value

php

mysql

mysqli

mysqli-multi-query