loadrunner 参数化取值方式详解

参数化对话框中与参数取值方式有关的区域如下：

改变参数化的取值方式，关键在于Select next row和Update value on这两个选项。

　　Select next row包括以下选项：

• Sequential：顺序方式
• Random：随机方式
• Unique：唯一方式

　　Update value on包括如下选项：

• Each iteration：每次迭代更新取值
• Each occurrence：每次取值更新
• Once：只更新一次

以下代码以登录接口和参数化进行演示，参数化文件中有2个值

lr_output_message("login_username:%s",lr_eval_string("{login_username}"));

web_custom_request("login",
		"URL=http://192.168.44.130:8080/mobile/api/user/login",
		"Method=POST",
		"TargetFrame=",
		"Resource=0",
		"Referer=",
		"Mode=HTTP",
		"EncType=application/json;charset=utf-8",
		"Body={"mobile":"{login_username}","password":"123456"}",
		LAST);

　参数化文件中的数据为：

13141140050
13141140058

第一种取值方式：Sequential+Each iteration，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6 [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" = "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" = "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Notify: Next row for parameter login_username = 2 [table = login_username].
Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" = "13141140058"
Action.c(18): login_username:13141140058
Action.c(20): web_custom_request("login") started [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" = "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Notify: Next row for parameter login_username = 1 [table = login_username].
Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" = "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" = "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

 第二种取值方式：Sequential+Each occurrence，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Notify: Next row for parameter login_username = 1 [table  = login_username].
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Starting action Action.
Action.c(18): Notify: Next row for parameter login_username = 1 [table  = login_username].
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

第三种取值方式：Sequential+Once，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

第四种取值方式：Random+Each iteration，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(18): login_username:13141140058
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Notify: Next row for parameter login_username = 1 [table  = login_username].
Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Notify: Next row for parameter login_username = 2 [table  = login_username].
Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(18): login_username:13141140058
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

第五种取值方式：Random+Each occurrence，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Notify: Next row for parameter login_username = 1 [table  = login_username].
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Starting action Action.
Action.c(18): Notify: Next row for parameter login_username = 1 [table  = login_username].
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

第六种取值方式：Random+Once，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

第七种取值方式：Unique+Each iteration

这种取值方式，又可以有以下几种设置：

当值不足时，可以选择以下3种方式：

1)、中断虚拟用户 

2)、循环取参数中的值，返回到第一行取值

3)、取最后一行值

以下运行结果以Abort Vuser为例执行，其它情况可自行设置运行，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Notify: Next row for parameter login_username = 2 [table  = login_username].
Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(18): login_username:13141140058
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Error: Parameter 'login_username': No more unique values for this parameter in table 'login_username.dat' [unique range is 1-2]. The Vuser is aborted according to "When Out Of Values" policy.
Action was aborted.
Ending Vuser...

第八种取值方式：Unique+Each occurrence，参数不够用时，也会报错，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '1'.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Next row for parameter login_username = 2 [table  = login_username].
Action.c(20): Notify: Getting new value for parameter 'login_username': table = 'login_username.dat' column = '0' row = '2'.
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140058"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Error: Parameter 'login_username': No more unique values for this parameter in table 'login_username.dat' [unique range is 1-2]. The Vuser is aborted according to "When Out Of Values" policy.
Abort was called from an action.
Ending Vuser...

第九种取值方式：Unique+Once，参数不够用时，也会报错，设置迭代次数为3次，参数取值结果为：

Starting iteration 1.
Maximum number of concurrent connections per server: 6      [MsgId: MMSG-26989]
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 1.
Starting iteration 2.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 2.
Starting iteration 3.
Starting action Action.
Action.c(18): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(18): login_username:13141140050
Action.c(20): web_custom_request("login") started      [MsgId: MMSG-26355]
Action.c(20): Notify: Parameter Substitution: parameter "login_username" =  "13141140050"
Action.c(20): web_custom_request("login") was successful, 361 body bytes, 157 header bytes, 12 chunking overhead bytes      [MsgId: MMSG-26385]
Ending action Action.
Ending iteration 3.

总结：