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Another powerful feature associated with object-relational stored procedures is the overloading of procedure definitions to allow them to process different types of data. In an object class hierarchy, it s frequently necessary to define a method that carries out the same or very similar operations on different classes of objects. For example, you may want to define a GET_TGT_WAGES method (function) that can obtain the target total annual wages for any of the subclasses of the PERSONNEL class in our example database. The method (which will be implemented as a stored function) should return the target total wages for the employee to which it is applied. The particulars of the calculation differ, depending on the type (class) of employee: I For technicians, total wages are the hourly rate times a normal 40-hour week 52 weeks per year. I For managers, total wages are equal to their annual salary plus bonus. I For all other engineers, total wages are equal to their annual salary. To solve this problem, a different GET_TGT_WAGES routine is defined for each class. The routine takes an object (a row of the TECHNICIANS, ENGINEERS, or MANAGERS table) as its parameter and returns the calculated amount. The three routines are identically named, which is the reason why the procedure name is said to be overloaded a single name is associated with more than one actual stored procedure. When the routine is called, the DBMS looks at the particular data type of the argument (that is, the particular class of the object) and determines which of the routines is the appropriate one to call. Informix Universal Server implements this stored procedure overloading capability without any additional object-oriented extensions. It allows you to define many different stored procedures with identical names, provided that no two of them have the identical number of arguments with identical data types. In the previous example, there would be three CREATE FUNCTION definitions like this:
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/* Calculates target wages for a technician */ CREATE FUNCTION GET_TGT_WAGES(PERSON TECH_TYPE) RETURNS MONEY(9,2) AS RETURN (PERSON.WAGE_RATE * 40 * 52) END FUNCTION; /* Calculates target wages for a manager */ CREATE FUNCTION GET_TGT_WAGES(PERSON MGR_TYPE) RETURNS MONEY(9,2) AS RETURN (PERSON.SALARY + PERSON.BONUS) END FUNCTION; /* Calculates target wages for an engineer */ CREATE FUNCTION GET_TGT_WAGES(PERSON ENGR_TYPE) RETURNS MONEY(9,2) AS RETURN (PERSON.SALARY) END FUNCTION;
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With these definitions in place, you can invoke the GET_TGT_WAGES() function and pass it a row from the ENGINEERS, MANAGERS, or TECHNICIANS table. The DBMS automatically figures out which of the functions to use and returns the appropriate calculated value. Stored procedures are made even more valuable for typed tables through Informix Universal Server s substitutability feature. If you call a stored procedure whose argument is a row type and pass it one of the rows from a typed table, Informix will first search for a stored procedure with the appropriate name whose argument data type is an exact match. For example, if you call a GET_LNAME() stored procedure to extract the last name from a TECH_TYPE row (probably from the TECHNICIANS table), Informix searches for a procedure written to process TECH_TYPE data. But if Informix doesn t find such a stored procedure, it does not immediately return with an error. Instead, it searches upwards in the type hierarchy, trying to find a procedure with the same name that is defined for a supertype of TECH_TYPE. If there is a GET_LNAME() stored procedure defined for the ENGR_TYPE type, Informix will execute that stored procedure to obtain the required information. If not, it will continue up the hierarchy, looking for a GET_LNAME() stored procedure defined for the PERS_TYPE type. Thus, substitutability means that you can define stored procedures (methods) for the highest-level type in the hierarchy to which they apply. The stored procedures are automatically available to process all subtypes of that type. (That is, all subclasses inherit the method from the class.)
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