问题描述

我有一个包含多个结果集的存储过程.我如何前进到 mysqli 中的第二个结果集以获得这些结果?

I have a stored procedure that has multiple result sets. How do I advance to the 2nd result set in mysqli to get those results?

假设它是一个存储过程，例如:

Let's say it's a stored proc like:

create procedure multiples( param1 INT, param2 INT )
BEGIN

SELECT * FROM table1 WHERE id = param1;

SELECT * FROM table2 WHERE id = param2;

END $$

PHP 是这样的:

$stmt = mysqli_prepare($db, 'CALL multiples(?, ?)');

mysqli_stmt_bind_param( $stmt, 'ii', $param1, $param2 );

mysqli_stmt_execute( $stmt );

mysqli_stmt_bind_result( $stmt, $id );

然后这是我无法开始工作的部分.我已经尝试使用 mysqli_next_result 移动到下一个结果集，但无法让它工作.我们确实让它与 mysqli_store_result 和 mysqli_fetch_assoc/array/row 一起工作，但由于某种原因，所有整数都作为空字符串返回.

Then this is the part I can't get to work. I've tried using mysqli_next_result to move to the next result set, but can't get it to work. We did get it to work with mysqli_store_result and mysqli_fetch_assoc/array/row, but for some reason all the ints get returned as blank strings.

有其他人遇到过这个问题并有解决方案吗?

Any one else come across this and have a solution?

推荐答案

我认为您在这里遗漏了一些东西.这是使用 mysqli 准备好的语句从存储过程中获取多个结果的方法:

I think you're missing something here. This is how you can get multiple results from stored procedure using mysqli prepared statements:

$stmt = mysqli_prepare($db, 'CALL multiples(?, ?)');
mysqli_stmt_bind_param($stmt, 'ii', $param1, $param2);
mysqli_stmt_execute($stmt);
// fetch the first result set
$result1 = mysqli_stmt_get_result($stmt);
// you have to read the result set here 
while ($row = $result1->fetch_assoc()) {
    printf("%d
", $row['id']);
}
// now we're at the end of our first result set.

//move to next result set
mysqli_stmt_next_result($stmt);
$result2 = mysqli_stmt_get_result($stmt);
// you have to read the result set here 
while ($row = $result2->fetch_assoc()) {
    printf("%d
", $row['id']);
}
// now we're at the end of our second result set.

// close statement
mysqli_stmt_close($stmt);

使用 PDO 你的代码看起来像:

Using PDO your code would look like:

$stmt = $db->prepare('CALL multiples(:param1, :param2)');
$stmt->execute(array(':param1' => $param1, ':param2' => $param2));
// read first result set
while ($row = $stmt->fetch()) {
    printf("%d
", $row['id']);
}
$stmt->nextRowset();
// read second result set
while ($row = $stmt->fetch()) {
    printf("%d
", $row['id']);
}

顺便说一句:你是故意使用程序风格的吗?在 mysqli 中使用面向对象的风格会让你的代码看起来更有吸引力(我的个人观点).

By the way: do you use the procedural style deliberately? Using object oriented style with mysqli would make your code look a little bit more appealing (my personal opinion).

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