在php/mysqli中使用存储过程检索多个结果集 [英] Retrieving Multiple Result sets with stored procedure in php/mysqli

问题描述

我有一个具有多个结果集的存储过程.如何前进到mysqli中的第二个结果集以获取那些结果?

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?

让我们说它是一个存储过程，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 );

然后这是我无法工作的部分.我尝试使用mysqli_next_result移至下一个结果集，但无法使其正常工作.我们确实使它可以与mysqli_store_result和mysqli_fetch_assoc/array/row一起使用，但是由于某种原因，所有int均以空字符串形式返回.

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.

还有其他人遇到这个问题并找到解决方案吗?

Any one else come across this and have a solution?

推荐答案

我认为您在这里缺少了一些东西(以下内容未经测试):

I think you're missing something here (the following has not been tested):

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

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

// close statement
mysqli_stmt_close($stmt);

使用 PDO ，您的代码应如下所示:

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

但是我听说 PDOStatement::nextRowset() 未实现与 MySQL PDO驱动程序使其无法检索多个结果集:

But I have heard that the PDOStatement::nextRowset() is not implemented with the MySQL PDO driver making it impossible to retrieve multiple result sets:

• PDO nextRowset无法在MySQL上运行
• pdo_mysql:存储过程调用返回单个行集会阻止将来的查询
• 无法在Windows上使用PDO中的存储过程

• PDO nextRowset not working on MySQL
• pdo_mysql: stored procedure call returning single rowset blocks future queries
• Can't use stored procedures from PDO on Windows

因此，根据您的PHP版本，您必须坚持使用 mysqli -解决方案.顺便说一句:您是否故意使用程序样式?将面向对象的样式与mysqli结合使用会使您的代码更具吸引力(我个人认为).

So, depending on your PHP version, you'd have to stick with your mysqli-solution. 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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