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PHP得到mssql的存储过程的输出参数功能实现

Jun 13, 2016 am 11:56 AM
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在开发过程中可能会遇到无法取得MSSQL存储过程的输出参数,很多朋友都不知道该怎么办,本文将详细介绍PHP得到mssql的存储过程的输出参数功能实现,需要了解的朋友可以参考下

复制代码 代码如下:



$conn=mssql_connect("127.0.0.1","user","passwd");
mssql_select_db("mydb");
$stmt=mssql_init("pr_name",$conn);//
$a=50001;
mssql_bind($stmt,"RETVAL",$val,SQLVARCHAR); //用于直接返回return -103此类的值。
mssql_bind($stmt,"@outvar",$b,SQLVARCHAR,true);//用于返回在存储过程中定义的输出参数
mssql_bind($stmt,"@invar",$a,SQLINT4);
$result = mssql_execute($stmt,true);//不能返回结果集,只能得到输出参数
//$result = mssql_execute($stmt,false); //返回结果集
//$records=mssql_fetch_array($result);
//print_r($records);
//mssql_next_result($result);下一个结果集,当等于FALSE的时候下一个就是输出参数
echo $b;
echo $val;
?>


下面这些是从别的地方看到的。
小麻烦
我们按照惯例使用了一个MS Sql Server的存储过程procA,它给出了一个输出参数nReturn,
而且返回了一个结果集。
在如何让PHP调用这个procA的时候,我们遭遇了一点小麻烦。
鱼肉和熊掌不可兼得:
我们本来希望这样的代码能够既得到输出参数,又得到返回的结果集:

复制代码 代码如下:


// 初始化要传进存储过程的参数们:
$nYear = 2004;
$nPageSize = 20;
$nPageNo = 1;
// Initializes a stored procedure:
$stmt = mssql_init("proc_stat_page", $db_mssql->Link_ID);
// 绑定输入参数:
mssql_bind($stmt, "@nReturn", $nReturn, SQLINT4, TRUE);
mssql_bind($stmt, "@nYear", $nYear, SQLINT4);
mssql_bind($stmt, "@nPageSize", $nPageSize, SQLINT4);
mssql_bind($stmt, "@nPageNo", $nPageNo, SQLINT4);
// 执行存储过程,得到QueryID:
$db_mssql->Query_ID = mssql_execute($stmt,false);


虽然得到了结果集,但是,这样$nReturn参数是拿不到输出参数的。
如果把最后一句话改为:
$db_mssql->Query_ID = mssql_execute($stmt,true);
输出参数倒是拿到了,结果集又没有了。
好像是一个鱼肉和熊掌不可兼得的样子。
难道PHP连这个都做不到?PHP手册中也没有讲这个问题。
来自于PHP维护者的解释:
原本我们这种调用办法是PHP 4.3版本之前肯定是支持的。
“但是,自从PHP 4.3版本之后,”他们说,“为了能够兼容存储过程返回多个结果集,PHP改变这个特性。”

“如果你不需要结果集,你应该设置mssql_execute的第二个可选参数为TRUE,这样mssql_execute方法之后你就可以得到输出参数了。”

“如果你需要返回的结果集们,你应该为每一个结果集调用一次mssql_next_result。在最后一个结果集返回之后,你再调用mssql_next_result就会得到返回值FALSE,这时候,你就可以访问输出参数了。”
解决:
在最后我们补上一句话
// After the last result has been returned the return value will have the value returned by the stored procedure.
mssql_next_result($db_mssql->Query_ID);
立刻,魔法生效了:
PHP填充了正确的输出参数到$nRetVal里。
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