loadrunner 关联有三个函数：
web_reg_save_param、web_create_html_param、web_create_html_param_ex
web_reg_save_param：这是最新版，也是最常用来做关联（correlation）的函数。
语法：
web_reg_save_param ( “Parameter Name” , < list of Attributes >, LAST );
web_create_html_param、web_create_html_param_ex：这二个函数主要是保留作为向前兼容的目的的。建议使用web_reg_save_param函数。
手动关联的执行过程大致如下：
1、使用相同的业务流程与数据，录制二份脚本
2、使用loadrunner：Tools-->Compare with Script可找出需要关联的数据。
脚本如下：
Action()
{
web_set_max_html_param_len("1024");
web_reg_save_param("JSESSIONID4",
"LB/IC=jsessionid=",
"RB/IC="",
"Ord=1",
"RelFrameId=1",
"Search=body",
LAST);
web_create_html_param("lt",
"name="lt" value="",
""");
web_url("login",
"URL=https://cas:8338/cas/login",
"Resource=0",
"RecContentType=text/html",
"Referer=",
"Snapshot=t10.inf",
"Mode=HTML",
EXTRARES,
"URL=theme/red/css/cssreset/reset-min.css", ENDITEM,
"URL=theme/red/jq/accordion/gh.accordion.css", ENDITEM,
"URL=theme/red/css/cssfonts/fonts-min.css", ENDITEM,
"URL=theme/red/css/cssbase/base-min.css", ENDITEM,
"URL=theme/red/jq/keypad.1.2.2/jquery.keypad.css", ENDITEM,
"URL=theme/red/img/sprite_bd_btn.png", ENDITEM,
"URL=theme/red/img/sprite_pay_icon.png", ENDITEM,
"URL=https://ssl.google-analytics.com/ga.js", ENDITEM,
"URL=theme/red/jq/tabs/tab.png", ENDITEM,
"URL=theme/red/jq/keypad.1.2.2/keypad.png", ENDITEM,
LAST);
web_custom_request("urs.asmx",
"URL=https://urs.microsoft.com/urs.asmx?MSPRU-Client-Key=q92TLcWWCOrCs2KtbnLAVg==&MSPRU-Patented-Lock=US5/Mh+o8nQ=",
"Method=POST",
"Resource=0",
"RecContentType=text/xml",
"Referer=",
"Snapshot=t11.inf",
"Mode=HTML",
"EncType=text/xml; charset=utf-8",
"Body=<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"><soap:Body><Lookup xmlns="http://Microsoft.STS.STSWeb/"><r soapenc:arrayType="xsd:string[1]"><string>https://cas/cas/login;jsessionid=ac6396fd77ea9b2074281d3072bb659a</string></r><ID>{A0AB7674-8D67-4F4D-B5E1-96FAEADFB79D}</ID><v soapenc:arrayType="xsd:string[5]"><string>7.0.6004.6</string><string>7.00.6000.16730</string><string>7.0.5730.13</string><string>5.1.2600.3.0</string><string>zh-cn</string></v></Lookup></soap:Body></soap:Envelope>",
LAST);
web_submit_data("login;jsessionid=D0C07C450E041F4EB71C9290570E05B3",
"Action=https://cas:8338/cas/login;jsessionid={JSESSIONID4}",
"Method=POST",
"RecContentType=text/html",
"Referer=https://cas:8338/cas/login",
"Snapshot=t12.inf",
"Mode=HTML",
ITEMDATA,
"Name=username", "Value=a@a.com", ENDITEM,
"Name=password", "Value=a", ENDITEM,
"Name=imageCode", "Value=", ENDITEM,
"Name=submit", "Value=", ENDITEM,
"Name=warn", "Value=false", ENDITEM,
"Name=lt", "Value={lt}", ENDITEM,
"Name=_eventId", "Value=submit", ENDITEM,
LAST);
web_find("web_find",
"What=您已经成功登录了！",
LAST);
web_url("LogAccessInfo.html",
"URL=http://ad.haowangjiao.com/LogAccessInfo.html?fromUrl=https://cas:8338/cas/login&keyword=&sourceUrl=https://cas:8338/cas/login&uuid=E561D54B-4FBF-4915-A2A0-9E8A5DA2A8B6&linkId=-1",
"Resource=0",
"RecContentType=text/html",
"Referer=",
"Snapshot=t13.inf",
"Mode=HTML",
LAST);
return 0;
}
这里要注意关联函数存放的位置，它不是直接放在web_submit_data的前面，而是放在了整个文件的最前面，如果直接放到web_submit_data前面的话，会报500的错误，还有 web_submit_data("login;jsessionid=D0C07C450E041F4EB71C9290570E05B3","Action=https://cas:8338/cas/login;jsessionid={JSESSIONID4}",第一个jsessionid和第二个jsessionid的处理方法不一样：（也不太清楚为什么，可能是第一个的位置无法从关联中取得值吧，因为如果第一个jsessionid也用关联的话，从log中看，它还是jsessionid=JSESSIONID4｝的形式）
从log中可以看到关联的值为多少，下面是Replay log：
Virtual User Script started
Starting action vuser_init.
Web Turbo Replay of LoadRunner 9.0.0 for WINXP; WebReplay82 build 5727 [MsgId: MMSG-27143]
Run-Time Settings file: "C:\Documents and Settings\Administrator\×ÀÃæ\c\\default.cfg" [MsgId: MMSG-27141]
Ending action vuser_init.
Running Vuser...
Starting iteration 1.
Starting action Action.
Action.c(4): web_set_max_html_param_len was successful [MsgId: MMSG-26392]
Action.c(10): Registering web_reg_save_param was successful [MsgId: MMSG-26390]
Action.c(18): Registering web_create_html_param was successful [MsgId: MMSG-26390]
Action.c(22): Notify: Saving Parameter "JSESSIONID4 = 93116597F9263946ADCFD7AA3BA34555"
Action.c(22): Notify: Saving Parameter "lt = _c68864BC7-FF33-9B55-CEC2-180473614BB9_k6BAF7C2C-AAE9-649E-1A1B-014BD23D3D94"
Action.c(22): Found resource "https://cas:8338/cas/theme/red/css/userpage_import.css" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/jq/jquery-1.3.2.min.js" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/jq/tabs/ui.tabs.css" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/jq/tabs/ui.tabs.pack.js" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/jq/keypad.1.2.2/jquery.keypad.js" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/css/userpage_spec.css" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/css/layout.css" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/theme/red/img/logo.gif" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/imageCode" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Detected non-resource "https://dev.pt.sdo.com/LoginFrame.asp?returnURL=https://cas:8338/cas/sdoUserCheck.html?service=null&appDomain=cas&curURL=https://cas:8338/?service=null&CSSURL=https://cas:8338/cas/theme/red/css/login_iframe_cas.css" in "https://cas:8338/cas/login" [MsgId: MMSG-26574]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/css/cssreset/reset-min.css" (specified by argument number 9) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/jq/accordion/gh.accordion.css" (specified by argument number 11) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/css/cssfonts/fonts-min.css" (specified by argument number 13) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/css/cssbase/base-min.css" (specified by argument number 15) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/jq/keypad.1.2.2/jquery.keypad.css" (specified by argument number 17) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/img/sprite_bd_btn.png" (specified by argument number 19) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/img/sprite_pay_icon.png" (specified by argument number 21) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://ssl.google-analytics.com/ga.js" (specified by argument number 23) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/jq/tabs/tab.png" (specified by argument number 25) [MsgId: MMSG-26577]
Action.c(22): Downloading resource "https://cas:8338/cas/theme/red/jq/keypad.1.2.2/keypad.png" (specified by argument number 27) [MsgId: MMSG-26577]
Action.c(22): Found resource "https://cas:8338/cas/js/adaliance.js" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Found resource "https://cas:8338/cas/js/googleNewGaJsHost.js" in HTML "https://cas:8338/cas/login" [MsgId: MMSG-26659]
Action.c(22): Continuing after Error -27796: Failed to connect to server "dev.pt.sdo.com:443": [10061] Connection refused [MsgId: MERR-27796]
Action.c(22): Warning -26000: Empty or no response for URL="https://dev.pt.sdo.com/LoginFrame.asp?returnURL=https://cas:8338/cas/sdoUserCheck.html?service=null&appDomain=cas&curURL=https://cas:8338/?service=null&CSSURL=https://cas:8338/cas/theme/red/css/login_iframe_cas.css" [MsgId: MWAR-26000]
Action.c(22): web_url("login") highest severity level was "continue on error", 358981 body bytes, 4868 header bytes, 32 chunking overhead bytes [MsgId: MMSG-26387]
Action.c(22): Continuing after error in Vuser script.
Action.c(42): Warning: The string 'A0AB7674-8D67-4F4D-B5E1-96FAEADFB79D' with parameter delimiters is not a parameter.
Action.c(42): web_custom_request("urs.asmx") was successful, 1128 body bytes, 279 header bytes [MsgId: MMSG-26386]
Action.c(55): Notify: Parameter Substitution: parameter "JSESSIONID4" = "93116597F9263946ADCFD7AA3BA34555"
Action.c(55): Notify: Parameter Substitution: parameter "lt" = "_c68864BC7-FF33-9B55-CEC2-180473614BB9_k6BAF7C2C-AAE9-649E-1A1B-014BD23D3D94"
Action.c(55): Found resource "https://cas:8338/cas/css/main.css" in HTML "https://cas:8338/cas/login;jsessionid=93116597F9263946ADCFD7AA3BA34555" [MsgId: MMSG-26659]
Action.c(55): Resource "https://cas:8338/cas/theme/red/css/userpage_spec.css" is in the cache already and will not be downloaded again [MsgId: MMSG-26655]
Action.c(55): Resource "https://cas:8338/cas/theme/red/css/layout.css" is in the cache already and will not be downloaded again [MsgId: MMSG-26655]
Action.c(55): Resource "https://cas:8338/cas/theme/red/img/logo.gif" is in the cache already and will not be downloaded again [MsgId: MMSG-26655]
Action.c(55): Resource "https://cas:8338/cas/js/adaliance.js" is in the cache already and will not be downloaded again [MsgId: MMSG-26655]
Action.c(55): Resource "https://cas:8338/cas/js/googleNewGaJsHost.js" is in the cache already and will not be downloaded again [MsgId: MMSG-26655]
Action.c(55): web_submit_data("login;jsessionid=D0C07C450E041F4EB71C9290570E05B3") was successful, 8205 body bytes, 627 header bytes [MsgId: MMSG-26386]
Action.c(71): "web_find" successful. 1 occurrence(s) of "ÄúÒѾ³É¹¦µÇ¼ÁË£¡" found (RightOf="", LeftOf="") [MsgId: MMSG-27196]
Action.c(71): web_find was successful [MsgId: MMSG-26392]
Action.c(75): Found resource "http://ad.haowangjiao.com/css/style.css" in HTML "http://ad.haowangjiao.com/LogAccessInfo.html?fromUrl=https://cas:8338/cas/login&keyword=&sourceUrl=https://cas:8338/cas/login&uuid=E561D54B-4FBF-4915-A2A0-9E8A5DA2A8B6&linkId=-1" [MsgId: MMSG-26659]
Action.c(75): web_url("LogAccessInfo.html") was successful, 9435 body bytes, 414 header bytes [MsgId: MMSG-26386]
Ending action Action.
Ending iteration 1.
Ending Vuser...
Starting action vuser_end.
Ending action vuser_end.
Vuser Terminated.
另外一种关联函数的用法：web_create_html_param_ex (“ItemValue”, “value=”, “>Ski Jacket”, “3”);
用这个函数是因为：
Find Unpredictable Data When Boundaries Are NOT Unique（值可能是没有边界）
这里的3表示第三个，就是左右边界条件的第三个参数（也就是满足左右条件的参数不只一个，就可以用空上函数来取值）。
建立关联的位置如：web_create_html_param("lt","name="lt" value="",""");
要放在这个参数页面之前，如之前我录制了首页然后跳转到cas，如果把这个关联放到首页之前的话就会出错，要把它放到登录页面之前（首页之后）