Overloading Packaged Subprograms : Packages « Function Procedure Packages « Oracle PL/SQL Tutorial






SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto',  'Programmer')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York',  'Tester')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York',  'Manager')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
  3  /

1 row created.

SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison               Mathews              21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester

8 rows selected.

SQL>
SQL>
SQL>
SQL> CREATE OR REPLACE PACKAGE EmployeePackage AS
  2    PROCEDURE AddEmployee(p_EmployeeID  IN Employee.id%TYPE,
  3                          p_first_name IN Employee.first_name%TYPE,
  4                          p_last_name     IN Employee.last_name%TYPE);
  5
  6    PROCEDURE AddEmployee(p_FirstName IN Employee.first_name%TYPE,
  7                         p_LastName  IN Employee.last_name%TYPE,
  8                         p_city IN Employee.city%TYPE);
  9
 10  END EmployeePackage;
 11  /

Package created.

SQL>
SQL> CREATE OR REPLACE PACKAGE BODY EmployeePackage AS
  2
  3    PROCEDURE AddEmployee(p_EmployeeID  IN Employee.id%TYPE,
  4                          p_first_name IN Employee.first_name%TYPE,
  5                          p_last_name     IN Employee.last_name%TYPE) IS
  6    BEGIN
  7      INSERT INTO Employee (id, first_name, last_name)
  8        VALUES (p_EmployeeID, p_first_name, p_last_name);
  9      COMMIT;
 10    END AddEmployee;
 11
 12    -- Add a new student by name, rather than ID.
 13    PROCEDURE AddEmployee(p_FirstName IN Employee.first_name%TYPE,
 14                         p_LastName  IN Employee.last_name%TYPE,
 15                         p_city IN Employee.city%TYPE) IS
 16      v_EmployeeID Employee.ID%TYPE;
 17    BEGIN
 18      SELECT ID
 19        INTO v_EmployeeID
 20        FROM Employee
 21        WHERE first_name = p_FirstName
 22        AND last_name = p_LastName;
 23
 24      -- Now we can add the student by ID.
 25      INSERT INTO Employee (id, first_name, city)
 26        VALUES (v_EmployeeID, p_firstname, p_city);
 27      COMMIT;
 28    END AddEmployee;
 29
 30  END EmployeePackage;
 31  /

Package body created.

SQL>
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.

SQL>








27.10.Packages
27.10.1.Packages
27.10.2.Private Versus Public Package Objects
27.10.3.Package State
27.10.4.Recompiling Packages
27.10.5.All packages can be recompiled by using the Oracle utility dbms_utility:
27.10.6.Creating a Package Specification
27.10.7.Creating a Package Body
27.10.8.Creating Packages and call its functions
27.10.9.Calling Functions and Procedures in a Package
27.10.10.A Package Specification and its body
27.10.11.Overloading Packaged Subprograms
27.10.12.Calls procedure in a package
27.10.13.Dropping a Package
27.10.14.Calling a Cursor Declared in a Different Package
27.10.15.Reference fields and methods in package
27.10.16.Controlling access to packages
27.10.17.Globals Stored in a Package
27.10.18.A Subtypes Example
27.10.19.Generate Random number
27.10.20.Crosss reference between two packages
27.10.21.package RECURSION
27.10.22.Using RESTRICT_REFERENCES in a Package
27.10.23.PLS-00452: Subprogram 'GETNAME' violates its associated pragma
27.10.24.Dynamically create packages