Overloaded programs in a package

PL allows overloaded programs in a package. Overloaded programs are two or more programs that have the same name but have different parameters and variables, parameter sequences, or data types, you can select a program to call based on the type of input parameters.

The following example shows a package specification. Methods of the query_obdept function are selected based on whether the input parameter is of a numeric or string type. Then, features are implemented in the package body definition.

CREATE OR REPLACE PACKAGE obdemo_pack1
IS
    DeptRec obdept%ROWTYPE;
    v_sqlcode NUMBER;
    v_sqlerr    VARCHAR2(2048);
    FUNCTION query_obdept(dept_no IN NUMBER)
        RETURN INTEGER;
    FUNCTION query_obdept(dept_no IN VARCHAR2)
        RETURN INTEGER;
END obdemo_pack1;
/