title: How to use multiple columns in Load runner?
body: <p>In HP Load Runner VU Gen, I'd like to white a script that reads data from a table, with multiple columns and use data to call some url, based on env. </p>
  
  <p>I do have 2 tables with the same structure : mytable_dev and mytable_prod. Those are File paramaters tables. For example, in mytable_dev.dat:
      firstname | lastname | age
      john      | Smith    | 12
      Lara      | Croft    | 24
      ...</p>
  
  <p>I can do something like this to get "dev" or "prod":</p>
  
  <pre><code>env = lr_get_attrib_string("env");
  </code></pre>
  
  <p>Then I can select the table (dev or prod) with:</p>
  
  <pre><code>sprintf (data_temp,"{url_imd_%s}", env);
  lr_save_string (lr_eval_string(data_temp), "data_env");
  </code></pre>
  
  <p>Then I'd like to call some url, based on table values:</p>
  
  <pre><code>web_rest("Foo",
    "URL=http://somesite.com/foo/{data_env['firstname']}/{data_env['lastname']}",
    ...
  </code></pre>
  
  <p>How can I do that ?</p>
  
  <p>Th.</p>