PHP:使用 INPUT 和 OUTPUT 参数(非“INOUT")调用 MySQL 存储过程

问题描述

我想从 PHP 调用 MySQL 中的存储过程.该过程采用输入和输出参数——不是INOUT"参数.

From PHP I would like to call a stored procedure in MySQL. The procedure takes input and output parameters -- not "INOUT" parameters.

举个简单的例子，假设我在 MySQL 中有以下存储过程:

For a simple example, say I have the following stored procedure in MySQL:

DELIMITER $$

DROP PROCEDURE IF EXISTS `test_proc`$$
CREATE PROCEDURE `test_proc`(
    in input_param_1 int,
    in input_param_2 int,
    in input_param_3 int,
    out output_sum int,
    out output_product int,
    out output_average int
)
BEGIN
    set output_sum = input_param_1 + input_param_2 + input_param_3;
    set output_product = input_param_1 * input_param_2 * input_param_3;
    set output_average = (input_param_1 + input_param_2 + input_param_3) / 3;
END$$

DELIMITER ;

现在，从 PHP 脚本/页面方面，假设我有以下变量(我们将它们称为proc 输入变量")，我想将它们作为 输入 参数提供给存储过程当我调用它时:

Now, from the PHP script/page side, say I have the following variables (we'll call them "proc input variables") that I want to feed to the stored procedure as input parameters when I call it:

$procInput1 = "123";
$procInput2 = "456";
$procInput3 = "789";

假设在 PHP 脚本/页面方面，我还有以下变量(我们将它们称为proc 输出变量")，我想将它们作为 输出 参数提供给存储过程在我调用它时由存储过程设置:

Let's say that on the PHP script/page side I also have the following variables (we'll call them "proc output variables") that I want to feed to the stored procedure as output parameters to be set by the stored procedure when I call it:

$procOutput_sum;
$procOutput_product;
$procOutput_average;

所以，本质上，在 PHP 脚本/页面方面，我想要做的本质上是(我意识到以下代码无效)，是...

So, in essence, on the PHP script/page side, what I want to be able to do, in essence (I realize the following code is not valid), is...

call test_proc($procInput1, $procInput2, $procInput3, $procOutput_sum, $procOutput_product, $procOutput_average);

...并且，一旦调用，以下 PHP 代码...

...and, once called, the following PHP code...

echo "Sum: ".$procOutput_sum;
echo "Product: ".$procOutput_product;
echo "Average: ".$procOutput_average;

...应该产生以下输出:

...should produce the following output:

Sum: 1368
Product: 44253432
Average: 456

一个警告是，如果可能的话，我希望能够使用 MySQLi 过程 函数/接口来做到这一点.如果不可能，那么我可以使用它.

One caveat is that, if at all possible, I would like to be able to do this using the MySQLi procedural functions/interface. If not possible, then however I can get it to work is what I'll use.

我已经有一段时间编程了，但 PHP 语言对我来说是一个相对较新的尝试.我找到了大量关于从 PHP 调用 MySQL 存储过程的教程.有些是使用输入参数调用存储过程的教程，有些是使用输出参数调用存储过程的教程，还有一些是使用inout<调用存储过程的教程/strong> 参数.我还没有找到任何关于调用存储过程的教程或示例，这些存储过程同时输入和输出参数，而特别不使用"inout"参数.我无法弄清楚如何对参数绑定(例如:mysqli_stmt_bind_param 和 mysqli_stmt_bind_result)进行编码并使其全部正常工作.

$procInput1 = 123;
$procInput2 = 456;
$procInput3 = 789;

$mysqli = mysqli_connect();

$call = mysqli_prepare($mysqli, 'CALL test_proc(?, ?, ?, @sum, @product, @average)');
mysqli_stmt_bind_param($call, 'iii', $procInput1, $procInput2, $procInput3);
mysqli_stmt_execute($call);

$select = mysqli_query($mysqli, 'SELECT @sum, @product, @average');
$result = mysqli_fetch_assoc($select);
$procOutput_sum     = $result['@sum'];
$procOutput_product = $result['@product'];
$procOutput_average = $result['@average'];

$procInput1 = 123;
$procInput2 = 456;
$procInput3 = 789;

$mysqli = new mysqli();

$call = $mysqli->prepare('CALL test_proc(?, ?, ?, @sum, @product, @average)');
$call->bind_param('iii', $procInput1, $procInput2, $procInput3);
$call->execute();

$select = $mysqli->query('SELECT @sum, @product, @average');
$result = $select->fetch_assoc();
$procOutput_sum     = $result['@sum'];
$procOutput_product = $result['@product'];
$procOutput_average = $result['@average'];