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# C Vuser scripts correlation functions

To correlate statements for protocols that do not have specific functions, you can use the C Vuser correlation functions. These functions can be used for all C-type Vusers, to save a string to a parameter and retrieve it when required.

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## lr_eval_string

Replaces all occurrences of a parameter with its current value.

In the following example, lr_eval_string replaces the parameter row_cnt with its current value. This value is sent to the Output window using lr_output_message.

    lrd_stmt(Csr1, "select count(*) from employee", -1, 1 /*Deferred*/, ...);
    lrd_bind_col(Csr1, 1, =;COUNT_D1, 0, 0);
    lrd_exec(Csr1, 0, 0, 0, 0, 0);
    lrd_save_col(Csr1, 1, 1, 0, "row_cnt");
    lrd_fetch(Csr1, 1, 1, 0, PrintRow2, 0);
    lr_output_message("value: %s" , lr_eval_string("The row count is: <row_cnt>"));

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## lr_save_string

Saves a null-terminated string to a parameter.

To save a NULL terminated string to a parameter, use lr_save_string. To save a variable length string, use lr_save_var and specify the length of the string to save.

In the following example, lr_save_string assigns 777 to a parameter emp_id. This parameter is then used in another query or for further processing.

    lrd_stmt(Csr1, "select id from employees where name='John'",...);
    lrd_bind_col(Csr1,1,=;ID_D1,...);
    lrd_exec(Csr1, ...);
    lrd_fetch(Csr1, 1, ...);
    /* GRID showing returned value "777" */
    lr_save_string("777", "emp_id");

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## lr_save_var

Saves a variable length string to a parameter.

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See also:

- Function Reference.

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