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。