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Oracle DBA FAQ - Working with Database Objects in PL/SQL

By: FYIcenter.com

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(Continued from previous part...)

How To Retrieve Values from Data Fields in RECORD Variables?

If a variable is a RECORD variable with data fields assigned values, you can retrieve those values out of its data fields by using fields names prefixed with variable name as "variable.field_name". Here is a sample script showing you how to retrieve field values from RECORD variables:

CREATE OR REPLACE PROCEDURE HELLO AS
  TYPE student IS RECORD (
    id NUMBER(5),
    first_name VARCHAR(80),
    last_name VARCHAR(80)
  );
  best_student student;
  another_student student;
  class_name VARCHAR2(80);
BEGIN
  class_name := 'FYI Center 2006';
  best_student.first_name := 'The';
  best_student.last_name := 'Best';
  DBMS_OUTPUT.PUT_LINE('Best student = ' || 
    best_student.first_name || ' ' 
    || best_student.last_name);
END;
/
Best student = The Best

How To Define a Data Field as NOT NULL?

When defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a default value. Here is a tutorial script showing you how to define a data field as NOT NULL:

CREATE OR REPLACE PROCEDURE HELLO AS
  TYPE student IS RECORD (
    id NUMBER(5) NOT NULL DEFAULT 0,
    first_name VARCHAR(80),
    last_name VARCHAR(80)
  );
  best_student student;
  another_student student;
  class_name VARCHAR2(80);
BEGIN
  class_name := 'FYI Center 2006';
  best_student.first_name := 'The';
  best_student.last_name := 'Best';
  DBMS_OUTPUT.PUT_LINE('Best student ID = ' 
    || best_student.id);
  DBMS_OUTPUT.PUT_LINE('Best student = ' || 
    best_student.first_name || ' ' 
    || best_student.last_name);
END;
/
Best student ID = 0
Best student = The Best

How To Define a RECORD Variable to Store a Table Row?

If you have a table, and want to define a RECORD variable to store all the data elements of a row from that table, you can use table_name%ROWTYPE to define the RECORD variable as shown in the following sample script:

CREATE TABLE student (id NUMBER(5) PRIMARY KEY,
  first_name VARCHAR(80) NOT NULL,
  last_name VARCHAR(80) NOT NULL);
Table created.

CREATE OR REPLACE PROCEDURE FYI_CENTER AS
  best_student student%ROWTYPE;
  another_student student%ROWTYPE;
  class_name VARCHAR2(80);
BEGIN
  class_name := 'FYI Center 2006';
  best_student.first_name := 'The';
  best_student.last_name := 'Best';
  DBMS_OUTPUT.PUT_LINE('Best student ID = ' 
    || best_student.id); 
  DBMS_OUTPUT.PUT_LINE('Best student = ' || 
    best_student.first_name || ' ' 
    || best_student.last_name);
END;
/
Best student ID = 
Best student = The Best

(Continued on next part...)

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