PHP-MySQL从存储过程获取out参数的值 [英] PHP - MySQL gets value of out parameter from a stored procedure

问题描述

我已经使用mysqli从PHP调用了MySQL存储过程.它有一个out参数.

I have called a MySQL stored procedure from PHP using mysqli. This has one out parameter.

$rs = $mysqli->query("CALL addNewUser($name,$age,@id)");

在这里，@id是out参数.接下来，我触发以下查询以获取out参数的值:

Here, @id is the out parameter. Next, I fire the following query to get the value of the out parameter:

$rs2 = $mysqli->query("SELECT @id");
while($row = $rs->fetch_object()){
    echo var_dump($row);
}

var_dump的输出如下.

object(stdClass)#5 (1) { ["@id"]=> string(6) "100026" }

因此，现在我想检索@id的值，但我无法获取.我尝试了$row[0]->{@id}，但这给出了以下错误:

So, now I want to retrieve the value of @id, which I am unable to. I tried $row[0]->{@id} but this gave following error:

PHP致命错误:不能将stdClass类型的对象用作数组

PHP Fatal error: Cannot use object of type stdClass as array

推荐答案

或者甚至只是执行"SELECT @id AS id"，那么$row->id都可以正常工作.我总是重命名选择列以使名称在必要时有意义:-)

Or even just do a "SELECT @id AS id" then $row->id will work fine. I always rename select columns to keep the name meaningful when necessary :-)

顺便说一句，您可以简单地将调用连接起来，然后选择@ ...(带有;语句定界符)，RS将作为返回值.不幸的是，这将返回一个mutli-resultset，您需要刷新整个集合，否则后续查询将停止.请参阅以下示例:

BTW, you can simply concatenate the call and select @... (with a ; statement delimiter) and the RS will be the returned value. Unfortunately this returns a mutli-resultset and you need to flush the full set otherwise the subsequent queries will stall. See following examples:

$db->multi_query( "CALL addNewUser($name,$age,@id);SELECT @id as id" );
$db->next_result();            // flush the null RS from the call
$rs=$db->store_result();       // get the RS containing the id
echo $rs->fetch_object()->id, "\n";
$rs->free();

或者将选择添加到addNewUser中，然后返回一个RS而不是out参数

Alternatively add the select into the addNewUser and return a RS instead of out param

$rs = $db->query( "CALL addNewUser($name,$age)" );
echo $rs->fetch_object()->id, "\n";
$rs->close();
$db->next_result();            // flush the null RS from the call

第一个返回一个多查询(NULL，RS)集，第二个返回一个(RS，NULL)集，因此您可以使用一个简单的query()调用来嵌入第一个fetch_object()，但是您仍然需要刷新RS堆栈.

The first returns a multiquery (NULL, RS) set and the second a (RS, NULL) set, hence you can use a simple query() call which embeds the first fetch_object(), but you still need to flush the RS stack.

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