Creating LoadRunner Dynamic Transaction Names

Today I wanted to use parameterized transaction names within a LoadRunner script. 

1) As I thought that a particular transaction was failing after a particular number of iterations. 

2) For Capturing the response time of  request having different keyword searches for each keyword 

Luckily this was pretty simple in LoadRunner. It was just a case of using lr_eval_string in the call to the transaction wrapper.

lr_start_transaction(lr_eval_string("Do Something {IterationNo}"));

…

lr_end_transaction(lr_eval_string("Do Something {IterationNo}"), LR_AUTO);

Example

lr_start_transaction(lr_eval_string("Response Time for search of {Keyword_Param}"));

web_url("autoSuggestion", 

"URL=http://lalitgarg.com/json/search/autoSuggestion?q={Keyword_Param}&catId=0&v=", 

"TargetFrame=", 

"Resource=1", 

"RecContentType=application/json", 

"Referer=", 

"Snapshot=t1.inf", 

LAST);

 lr_end_transaction(lr_eval_string(" Response Time for search of {Keyword_Param}"), LR_AUTO);

You have to be careful above to make sure that start and end transaction names are the same. To overcome that problem I created a string variable to hold the LoadRunner transaction name.

char sTranName[20];

…

sprintf(sTranName,lr_eval_string("TransactionA_{pIteration}"));

lr_start_transaction(sTranName);

…

lr_end_transaction(sTranName,LR_AUTO);