The document discusses functions and stored procedures in SQL. Functions are logical grouped SQL/PL statements that perform a specific task and return a value, while stored procedures perform a specific task without returning a value. The document provides examples of creating simple SQL functions that return values and a stored procedure that updates employee salaries and bonuses.

2.  Cursors : OPEN CLOSE and FETCH
 Creation of User Defined Function
 Creation of Stored Procedure

3.  Types of cursor
 Cursor Predicates
 Referencing cursor variable
 Code

4.  Function : A function is a logical grouped set of
SQL/PL statement that perform a specific task.
 PL/SQL functions are created by executing the
CREATE FUNCTION statement.
 Such functions can be dropped from the database by
using the DB2 SQL DROP statement.
 Drop function Func_name;

5. Create or replace function function_name (var1
datatype,var2 datatype) returns datatype
language SQL contains|reads|modifies sql data
Begin
………SQL PL code………..
return <value>;
End;

6. create or replace function simple_function()
returns varchar(10)
begin
return 'hello';
end;
;

7.  Create or replace function bonus(salary
int, bonus int)
returns int
return salary*bonus/100
Example

8. create or replace function create_table() returns int
language sql modifies sql data
begin
create table st(id int, name varchar(10), salary
numeric(10));
return 0;
end;

9.  Function also used to return table.
 Code
 Function_get.txt

10.  Stored Procedure is a logical grouped set
of SQL/PL statement that perform a
specific task.
 It can help to improve application
performance and reduce database access
traffic.

11.  Support procedural construct in high level PL
like C, c++ and java etc.
 Are stored in databases and run on DB2
server.
 Easily call whenever required(call statement)

12.  Reduce network usage between client and server.
 Enhance capabilities
 Increase memory disk space on the server
 Improve security
 User can call stored procedure but do not required.
 Reduced development cost.
 Centralized security and maintenance.

13. Create or replace procedure procedure_name
(in | out | inout arg1 type1,
in | out | inout arg2 type2,………)
Language SQL contains SQL
Begin
……statement…..
End

14.  Create procedure name:
 It define name of store procedure.
 What the name and data types of argument.
 In – input variable.
 Out – output variable.
 inout – both input and output.

15.  Language SQL contains sql
 Option can be
 Reads SQL data
 Contains SQL data
 Modifies SQL data
 Begin ….End statement
 Logic of store procedure
 Code

16.  Create Procedure p()
 BEGIN DECLARE C1 cursor;
 DECLARE varInt INT;
 SET count = -1;
 SET c1 = CURSOR FOR SELECT c1 FROM t1;
 IF (c1 IS NOT OPEN) THEN OPEN c1;
 ELSE set count = -2; END IF;
 set count = 0;
 IF (c1 IS OPEN) THEN
 FETCH c1 into varInt;
 WHILE (c1 IS FOUND) DO
 SET count = count + 1;
 FETCH c1 INTO varInt;
 END WHILE;
 ELSE SET count = 0;
 END IF;
 END@

17.  CREATE PROCEDURE
ADMINISTRATOR.UPDATE_SAL (IN empNum
CHAR(6), IN rating SMALLINT)
 LANGUAGE SQL
 BEGIN
 IFrating = 1 THEN
 UPDATE employee
 SET salary = salary * 1.10,
 bonus = 1500 WHERE empno = empNum;
ELSE UPDATE employee
 SET salary = salary * 1.05, bonus = 1000
WHERE empno = empNum;
 END IF;
 END