Reg: Normal and a set slider

Dear all,

Could you please explain on the underside of those who, what and all of the differences between a Normal and a slider set.

CREATE OR REPLACE

FUNCTION (CFN)

NUMBER OF VEMPNUM)

RETURN VARCHAR2

IS

CURSOR C1

IS

SELECT ENAME FROM EMP WHERE EMPNO = VEMPNUM;

vename VARCHAR2 (10);

BEGIN

OPEN C1;

LOOP

FETCH C1 IN VENAME;

OUTPUT

WHEN C1% NOTFOUND;

END LOOP;

RETURN VENAME;

CLOSE c1;

END;

SELECT cfn (7788) FROM dual;


SQL > set serverout on
SQL > CREATE OR REPLACE
FUNCTION (CFN) 2
VEMPNUM NUMBER 3)
4 RETURN VARCHAR2
5 EAST
6 CURSOR C1 (vempnum NUMBER)
7 EAST
8. SELECT ENAME FROM EMP WHERE EMPNO = VEMPNUM;
9 vename VARCHAR2 (10);
BEGIN 10
11 C1 (vempnum) OPEN;
12 LOOP
13 FETCH C1 IN VENAME;
EXIT 14
15. WHAT C1% NOTFOUND;
16 END LOOP;
17 RETURN VENAME;
18 CLOSE c1;
END 19;
20.

The function is created.

SQL > select cfn (7788) twice;

CFN (7788)
--------------------------------------------------------------------------------
SCOTT

SQL >

Thank you

They are exactly the same on the side slider (engine/SQL server). Same execution plan.

The difference is on the side of the appellant (PL/SQL).

Why the difference? Modularization.

Usually, you set a cursor variable in PL/SQL as local. That means it can use local variables of PL/SQL for binding. No need to do so via the slider settings.

However, there may be situations where the same cursor is used per unit of different code (procedures and functions). In this case, you won't have to duplicate the code in each unit of code and a cursor variable. You want modularize by creating a unique cursor variable that can be used by several units of code. In this case, the slider should be set to variable bind definable/usable by any unit of code, using the slider. Thus, you will set this slider with parameters. Code units can now call this reusable cursor using local variables and global variable to assign values to bind variables in the cursor.

Tags: Database

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