Oracle_PLSQL_basic_tutorial_with_workon_Exercises.ppt

INTRODUCTION TO
PL/SQL
By:
Dheeraj Kashnyal
1

INTRODUCTION TO PL/SQL
• PROCEDURAL LANGUAGE EXTENSION FOR SQL
• ORACLE PROPRIETARY
• 3GL CAPABILITIES
• INTEGRATION OF SQL
• PORTABLE WITHIN ORACLE DATABASES
• CALLABLE FROM ANY CLIENT
2

STRUCTURE OF PL/SQL
3
PL/SQL is Block Structured –
A block is the basic unit from which all
PL/SQL programs are built. A block can be
named (functions and procedures) or
anonymous
Sections of block
1- Header Section
2- Declaration Section
3- Executable Section
4- Exception Section

STRUCTURE OF PL/SQL
HEADER
TYPE AND NAME OF BLOCK
DECLARE
VARIABLES; CONSTANTS; CURSORS;
BEGIN
PL/SQL AND SQL STATEMENTS
EXCEPTION
EXCEPTION HANDLERS
END;
4

EXERCISE 1 :
5
Let us test our basic SQL knowledge before we
move to actual PL/SQL insights:
1. Create a SQL query to show the current date in
the database.
2. Create a SQL query to show only “UN” from the
word “UNITED” as o/p.

STRUCTURE OF PL/SQL
DECLARE
A NUMBER;
TEXT1 VARCHAR2(20) := ‘HELLO';
TEXT2 VARCHAR2(20);
BEGIN
TEXT2 := ‘WORLD';
DBMS_OUTPUT.PUT_LINE('TEXT1 :'|| TEXT1);
DBMS_OUTPUT.PUT_LINE('TEXT2 :' || TEXT2);
DBMS_OUTPUT.PUT_LINE(TEXT1 ||' ' || TEXT2);
END;
“ Important Data Types in PL/SQL include NUMBER,
INTEGER, CHAR, VARCHAR2, DATE etc
to_date(‘02-05-2007','dd-mm-yyyy') { Converts
String to Date} “
6

DEBUGING
• SHOW ERROR;
• DBMS_OUTPUT.PUT_LINE(‘ .. ‘);
• SET SERVEROUTPUT ON;
• EXCEPTION BLOCKS;
7

EXERCISE 2:
• CREATE A PL/SQL BLOCK TO SHOW YOUR NAME ,DOJ &
EMP_ID IN THE O/P .
• CREATE A PL/SQL BLOCK TO CALCULATE YOUR EXPERIENCE
IN MONTHS.
8

STRUCTURE OF PL/SQL
• DATA TYPES FOR SPECIFIC COLUMNS
VARIABLE_NAME
TABLE_NAME.COLUMN_NAME%TYPE;
THIS SYNTAX DEFINES A VARIABLE OF THE TYPE
OF THE REFERENCED COLUMN ON THE
REFERENCED TABLE 9

PL/SQL CONTROL STRUCTURE
10
PL/SQL has several control structures
which include:
• Conditional controls
• Iterative or loop controls.
• Exception or error controls
It is these controls, used singly or
together, that allow the PL/SQL developer
to direct the flow of execution through
the program.

• CONDITIONAL CONTROLS
IF....THEN....END IF;
IF....THEN...ELSE....END IF;
IF....THEN...ELSIF....THEN....ELSE....END IF;
11

• LOOP
...SQL STATEMENTS...
EXIT;
END LOOP;
• WHILE LOOPS-
• WHILE CONDITION LOOP
...SQL STATEMENTS...
END LOOP;
• FOR LOOPS-
• FOR <VARIABLE(NUMERIC)> IN [REVERSE]
<LOWERBOUND>..<UPPERBOUND> LOOP .... ..... END
LOOP;
12

PL/SQL CONTROL STRUCTURE –
UPCOMING SESSIONS
• CURSOR
DECLARE
NAME VARCHAR2(20);
CURSOR C1 IS
SELECT T.NAME
FROM TABLE T
WHERE DATE IS NOT NULL;
BEGIN
OPEN C1;
LOOP
FETCH C1 INTO NAME;
EXIT WHEN C1%NOTFOUND;
END LOOP;
CLOSE C1;
END;
13

THANK YOU
14
Stay tuned for more
interactive learning
sessions...

Oracle_PLSQL_basic_tutorial_with_workon_Exercises.ppt

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