introduction to pl sql online training classes part 1
DESCRIPTION
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PL/SQL (Embedded SQL)
Introduction
Benefits
Basic Constructs
Anonymous blocks
Procedures
Functions
Packages
Triggers
Cursors
Dynamic SQL
Introduction
• Embedded SQL (PL/SQL, JAVA/ VB & DB)
• Database Server Level Programming • (PL/SQL, Transact-SQL, IBM DB2-Cobol, ProC, ProCobol)
• Database Client Programming
Developer 9i, JDeveloper 9i, Java (J2EE), VB, .Net
Benefits
• More powerful than pure SQL because
it co.ukbines the power of SQL and
– Iteration (loops)
– Selection (Ifs)
– Cursors
– Block Structures
– Stored Procedures
– etc.
Basic Constructs
• Basic Structure
• Running a program
• Variables
• SELECT INTO
• co.ukments
• IFs
• LOOPs
• Output
Basic Structure
DECLARE
BEGIN
EXCEPTION
END;
OUTPUT
SET SERVEROUTPUT ON;
BEGIN
DBMS_OUTPUT.PUT_LINE('This is my fist program');
END;
/
Before executing code that contains DBMS_OUTPUT.PUT_LINE,
must run (in a current session) at SQL prompt: set serveroutput on
Basic Structure: Example
DECLARE
v_id INTEGER;
v_empno NUMBER;
BEGIN
v_id := 1234567;
SELECT EMPNO
INTO V_EMPNO
FROM EMP
WHERE empno = v_id;
DBMS_OUTPUT.PUT_LINE('Value is '||v_empno);
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('No record exists');
END;
/
Basic Structure: Example
DECLAREv_id INTEGER;
BEGINv_id := 1234567;
DELETE FROM EMPWHERE id = v_id;
END;/
Running a Program
DECLARE
BEGIN
EXCEPTION
END;
/
Variables
• co.ukmon Data Types– NUMBER
– DATE
– INTEGER
– VARCHAR2
– CHAR
– BOOLEAN
• Declaration– V_salary NUMBER(9,2);
– V_id INTEGER;
– V_dob DATE;
– V_name VARCHAR2(35);
– V_gender CHAR;
– V_salary emp.salary%TYPE;
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