Use Object PL/SQL : Object Type « Object Oriented « Oracle PL/SQL Tutorial





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> create or replace type emp2_oty is object (empNo NUMBER,eName VARCHAR2(10))
  2  /

Type created.

SQL>
SQL> create or replace type emp2_nt is table of emp2_oty
  2  /

Type created.

SQL>
SQL>
SQL>
SQL> create or replace function f_getEmpDept_nt (i_deptNo varchar)
  2  return emp2_nt
  3  is
  4      v_emp2_nt emp2_nt:=emp2_nt();
  5      cursor c_emp is select * from employee where id=i_deptNo;
  6  begin
  7      for r_emp in c_emp loop
  8         v_emp2_nt.extend;
  9         v_emp2_nt(v_emp2_nt.last):= emp2_oty(r_emp.id, r_emp.first_Name);
 10      end loop;
 11      return v_emp2_nt;
 12  end;
 13  /

Function created.

SQL>
SQL> drop type emp2_nt;

Type dropped.

SQL>
SQL> drop type emp2_oty;

Type dropped.

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

Table dropped.

SQL>
SQL>










32.1.Object Type
32.1.1.Creating Object Types
32.1.2.Object instances and initialization
32.1.3.Nested object
32.1.4.Declare a function.
32.1.5.The MEMBER FUNCTION clause declares the getByDate() function.
32.1.6.The body defines the code for the method, and a body is created using the CREATE TYPE BODY statement.
32.1.7.Create a synonym and a public synonym for a type
32.1.8.Using DESCRIBE to Get Information on Object Types
32.1.9.Object types with member functions
32.1.10.add attribute
32.1.11.drop attribute
32.1.12.Object elements are referenced by using variable.attribute and variable.method notation.
32.1.13.Call data type member function in PL/SQL
32.1.14.Call data type constructor to initialize it
32.1.15.You must create an instance of the object first. With object types, you cannot just start assigning values to attributes.
32.1.16.You can set the depth to which DESCRIBE will show information using SET DESCRIBE DEPTH.
32.1.17.Use objects in SQL, First, you can use object types as attributes in a traditional relational way)
32.1.18.Alternatively, you can create an object table.
32.1.19.Use Object PL/SQL
32.1.20.Retrieve object as a whole
32.1.21.Using Objects
32.1.22.Combine user-defined type to create new type
32.1.23.Use self to reference member variable
32.1.24.Overloading based on user defined object types.