About PL/SQL/
•• PL/SQL/ isis an extensiont i toto SQL withith designi featuresf t r off programmingr r i languagesl ..
•• Datata manipulationi l ti and queryry statementst t ts off SQL arere includedi l withinit in proceduralr r l unitsits off code..
I-23
PL/SQL/ Environmenti
PL/SQL block
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PL/SQL engine |
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PL/SQL |
PL/SQL |
Procedural |
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SQL |
Statement |
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block |
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Executor |
SQL Statement Executor |
Oracle Server |
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Benefitsi of PL/SQL/
Integration
Application
Shared |
Oracle Server |
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library |
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Benefitsi of PL/SQL/
Improve Performance
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SQL |
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Application |
SQL |
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SQL |
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SQL |
SQL
IF...THEN
SQL
Application ELSE SQL
END IF; SQL
OtherDBMSs
Oraclewith
PL/SQL
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Benefitsi of PL/SQL/
Modularize program development
Anonymous |
Anony ous |
block |
block |
Application |
Application |
trigger |
trigger |
Database |
Database |
trigger |
trigger |
DECLARE
BEGIN
EXCEPTION
END;
Stored |
Stored |
procedure/ |
procedure/ |
function |
function |
Application |
Application |
procedure/ |
procedure/ |
function |
function |
Packaged |
Packaged |
procedure |
procedure |
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Benefitsi of PL/SQL/
•• ItIt isis portablert le..
•• You can declarel re identifiersi tifi rs..
•• You can programr r withith proceduralr r l languagel controltr l structurestr t r ..
•• ItIt can handlele errorsrr rs..
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Benefitsi of PL/SQL/
•• ItIt isis portablert le..
•• You can declarel re identifiersi tifi rs..
•• You can programr r withith proceduralr r l languagel controltr l structurestr t r ..
•• ItIt can handlele errorsrr rs..
I-29
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Tablesl |
Used inin the Course |
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EMP |
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EMPNO |
ENAME |
JOB |
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MGR HIREDATE |
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SAL |
COMM |
DEPTNO |
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--------- |
---------- --------- --------- --------- --------- --------- --------- |
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7839 |
KING |
PRESIDENT |
17-NOV-81 |
5000 |
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10 |
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7698 |
BLAKE |
MANAGER |
7839 01-MAY-81 |
2850 |
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30 |
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7782 |
CLARK |
MANAGER |
7839 09-JUN-81 |
1500 |
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10 |
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7566 |
JONES |
MANAGER |
7839 02-APR-81 |
2975 |
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20 |
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7654 |
MARTIN |
SALESMAN |
7698 28-SEP-81 |
1250 |
1400 |
30 |
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7499 |
ALLEN |
SALESMAN |
7698 20-FEB-81 |
1600 |
300 |
30 |
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DEPT |
7844 |
TURNER |
SALESMAN |
7698 08-SEP-81 |
1500 |
0 |
30 |
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7900 |
JAMES |
CLERK |
7698 03-DEC-81 |
950 |
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30 |
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7698 22-FEB-81 |
1250 |
500 |
30 |
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DEPTNO DNAME |
LOC |
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7566 03-DEC-81 |
3000 |
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20 |
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--------- -------------- ---------- |
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7902 17-DEC-80 |
SALGRADE |
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10 ACCOUNTING |
NEW |
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GRADE |
LOSAL |
HISAL |
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7566 09-DEC-82 |
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YORK |
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--------- --------- --------- |
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7788 12-JAN-83 |
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20 RESEARCH |
DALLAS |
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1 |
700 |
1200 |
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7782 23-JAN-82 |
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30 SALES |
CHICAGO |
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2 |
1201 |
1400 |
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40 OPERATIONS |
BOSTON |
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3 |
1401 |
2000 |
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4 |
2001 |
3000 |
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5 |
3001 |
9999 |
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I-30
Summary
•• Relationall ti l databasest arere composed off relations,r l ti , managed by relationalr l ti l operations,r ti , and governedr by datata integrityi t rity constraintstr i ts..
•• Oracler le Serverr r allowsll you toto storet re and manage informationi f r ti by usingi thet SQL languagel and PL/SQL/ enginei ..
•• PL/SQL/ isis an extensiont i toto SQL withith designi featuresf t r off programmingr r i languagesl ..
I-31