Creating the user-defined routines

About this task

The Mercury module uses two user-defined routines to prevent users from entering values below absolute zero in the data types CTemp and FTemp. In this module, you implement Assign() functions for the FTemp and CTemp data types. The C functions that implement the Assign() functions are named FTempAssign() and CTempAssign(). The server calls the appropriate routine before it stores a value for either of the two temperature types.

To create the Assign() functions:

Procedure

  1. Choose Edit > Insert > Routine and type the following information, once for each routine, in the New Routine wizard.
    Routine property FTempAssign value CTempAssign value
    Routine Name (SQL) assign assign
    Language C C
    Return type FTemp CTemp
    Statement Local Variables No No
    Arguments Name: temperature, Type: FTemp Default: leave blank Name: temperature, Type: CTemp, Default: leave blank
    Routine Calling Options Only the Routine does not accept NULL arguments check box must be checked; clear the Routine may return inconsistent check box. Only the Routine does not accept NULL arguments check box must be checked; clear the Routine may return inconsistent check box.
    Routine Name (C) FTempAssign CTempAssign
    Shared object path Default Default
    Behavior of Routines Routine is well-behaved Routine is well-behaved
    Special Stack Requirements None None
    Cost of a Routine 0 0
    Related Routines None None
    Object grant privileges Grant execute privileges Grant execute privileges
  2. Click Finish and then choose Project > Save to save your project.