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：
