学习LoadRunner之关联（一）

以下是一个很典型的关联的例子：

我们先录制系统自带的订票系统的登陆和退出的代码：

Action()
{

	web_url("WebTours", 
		"URL=http://127.0.0.1:1080/WebTours/", 
		"Resource=0", 
		"RecContentType=text/html", 
		"Referer=", 
		"Snapshot=t1.inf", 
		"Mode=HTML", 
		LAST);

	lr_think_time(4);

	web_submit_data("login.pl", 
		"Action=http://127.0.0.1:1080/WebTours/login.pl", 
		"Method=POST", 
		"RecContentType=text/html", 
		"Referer=http://127.0.0.1:1080/WebTours/nav.pl?in=home", 
		"Snapshot=t2.inf", 
		"Mode=HTML", 
		ITEMDATA, 
		"Name=userSession", "Value=104241.004374241fDzViQzpzzcfDcVHVpDHQQHf", ENDITEM, /*session号（随机的）*/
		"Name=username", "Value=test1", ENDITEM, 
		"Name=password", "Value=test1", ENDITEM, 
		"Name=JSFormSubmit", "Value=on", ENDITEM, 
		"Name=login.x", "Value=48", ENDITEM, 
		"Name=login.y", "Value=10", ENDITEM, 
		LAST);

	web_image("Search Flights Button", 
		"Alt=Search Flights Button", 
		"Snapshot=t3.inf", 
		LAST);

	web_image("SignOff Button", 
		"Alt=SignOff Button", 
		"Ordinal=1", 
		"Snapshot=t4.inf", 
		LAST);

	return 0;
}

录制完后，我们再次运行代码，报错：

Action.c(31): Error -27987: Requested image not found    [MsgId: MERR-27987]

Action.c(31): web_image("Search Flights Button") highest severity level was "ERROR", 0 body bytes, 0 header bytes  [MsgId: MMSG-26388]

这里报错是因为每次登陆时系统为其分配一个session号（随机的）（红色标注的代码），所以要对seesion做关联。

我们可以验证下：

将刚刚录制的代码保存，再录制一遍刚才的步骤，点击工具——》对比代码：

可以看到有三处不一样，第一处是userSession，后面是点击按钮时的x,y坐标。
1：自动关联：
a.点击Vuser->Scan Script for Correlations点击对比后的Correlate即可。
b.将Vuser->Run-Time Setting的日志设置设置成扩展日志，在回放日志里面找到<input type=hidden name=userSession value=104241.774564601fDzVQDzpcHQVzzzHDcVHVpzVHzHf>其实就是每次红色部分的内容不同，所以我们要关联它。
将代码前加上红色的函数，第一个参数是自己起的名字，LB是要关联部分的左边，RB是要关联部分的右边。将原来的value值用函数里面的第一个参数代替。

Action()
{
	web_reg_save_param("sessionID","LB=userSession value=","RB=>",LAST);
	web_url("WebTours", 
		"URL=http://127.0.0.1:1080/WebTours/", 
		"Resource=0", 
		"RecContentType=text/html", 
		"Referer=", 
		"Snapshot=t1.inf", 
		"Mode=HTML", 
		LAST);

	lr_think_time(4);

	

	web_submit_data("login.pl", 
		"Action=http://127.0.0.1:1080/WebTours/login.pl", 
		"Method=POST", 
		"RecContentType=text/html", 
		"Referer=http://127.0.0.1:1080/WebTours/nav.pl?in=home", 
		"Snapshot=t2.inf", 
		"Mode=HTML", 
		ITEMDATA, 
		"Name=userSession", "Value={sessionID}", ENDITEM, 
		"Name=username", "Value=test1", ENDITEM, 
		"Name=password", "Value=test1", ENDITEM, 
		"Name=JSFormSubmit", "Value=on", ENDITEM, 
		"Name=login.x", "Value=48", ENDITEM, 
		"Name=login.y", "Value=10", ENDITEM, 
		LAST);

	web_image("Search Flights Button", 
		"Alt=Search Flights Button", 
		"Snapshot=t3.inf", 
		LAST);

	web_image("SignOff Button", 
		"Alt=SignOff Button", 
		"Ordinal=1", 
		"Snapshot=t4.inf", 
		LAST);

	return 0;
}

若有疑问或不正之处，欢迎提出指正和讨论。