The package specification contains the definitions of all the elements in the package that can be referenced from outside of the package. These definitions are called the public elements of the package, and they act as the package interface.
The following example shows how to create package specification.
-- -- The [ackage specification for the 'emp_admin' package. -- CREATE OR REPLACE PACKAGE emp_admin IS FUNCTION get_dept_name ( p_deptno NUMBER DEFAULT 10 ) RETURN VARCHAR2; FUNCTION update_emp_sal ( p_empno NUMBER, p_raise NUMBER ) RETURN NUMBER; PROCEDURE hire_emp ( p_empno NUMBER, p_ename VARCHAR2, p_job VARCHAR2, p_sal NUMBER, p_hiredate DATE DEFAULT sysdate, p_comm NUMBER DEFAULT 0, p_mgr NUMBER, p_deptno NUMBER DEFAULT 10 ); PROCEDURE fire_emp ( p_empno NUMBER ); END emp_admin;
This example shows how to create the emp_admin package specification. This package specification consists of two functions and two stored procedures. You can also add the OR REPLACE clause to the CREATE PACKAGE statement for convenience.