Question

Generate where clause of the SQL stmt dynamically in PL/SQL stored proc

Asked by: viani

Hi I am having stored proc with 5 input parameters.

I will generating the SQL based on the input parameters. All the 5 input parameters may or may not be avialble. I will have to write the 'where' clause only if the input value is avialble.

Eg.
 Sp1 (in1 varchar2, in2 varchar2, in3 varchar2, in4 varchar2, in5 varchar2)
 Select * from table1
 where col1 = in1
 and col2 = in2 //I'll have to give this statement only if the value for in2 is  sent by the user and so on.
 and col3 = in3
 and col4 = in4
 and col5 = in5

How do I generate the 'where' criteria statements dynamically.


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Asked On
2005-11-02 at 07:51:24ID21616658
Tags

where

,

clause

,

dynamically

,

generating

Topic

Oracle Database

Participating Experts
5
Points
50
Comments
12

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Answers

 

by: kotisivaPosted on 2005-11-02 at 08:42:33ID: 15209486

Write query as 'where (col1=' & c & '  OR col1=' n1) And ' ......
where c may be having 1 or 0 depending on the value passed or not.

 

by: ploubierPosted on 2005-11-02 at 08:43:33ID: 15209498

CREATE OR REPLACE PROCEDURE sp1 (in1 IN VARCHAR2, in2 IN VARCHAR2, in3 IN VARCHAR2, in4 IN VARCHAR2, in5 IN VARCHAR2)
IS
         v_sql VARCHAR2(2000);
BEGIN
       v_sql := 'SELECT * FROM table1';
       IF in1 IS NOT NULL THEN
             v_sql := v_sql || ' WHERE col1=''' || in1 || '''';
       END IF;
       IF in2 IS NOT NULL THEN
             IF INSTR(v_sql, 'WHERE', 1, 1)>0 THEN
               v_sql := v_sql || ' AND col2=''' || in2 || '''';
            ELSE
               v_sql := v_sql || ' WHERE col2=''' || in2 || '''';
            END IF;
       END IF;
       IF in3 IS NOT NULL THEN
             IF INSTR(v_sql, 'WHERE', 1, 1)>0 THEN
               v_sql := v_sql || ' AND col3=''' || in3 || '''';
            ELSE
               v_sql := v_sql || ' WHERE col3=''' || in3 || '''';
            END IF;
       END IF;
       IF in4 IS NOT NULL THEN
             IF INSTR(v_sql, 'WHERE', 1, 1)>0 THEN
               v_sql := v_sql || ' AND col4=''' || in4 || '''';
            ELSE
               v_sql := v_sql || ' WHERE col4=''' || in4 || '''';
            END IF;
       END IF;
       IF in5 IS NOT NULL THEN
             IF INSTR(v_sql, 'WHERE', 1, 1)>0 THEN
               v_sql := v_sql || ' AND col5=''' || in5 || '''';
            ELSE
               v_sql := v_sql || ' WHERE col5=''' || in5 || '''';
            END IF;
       END IF;
       v_sql := v_sql || ';';
       DBMS_OUTPUT.PUT_LINE (v_sql);
END;
/

 

by: ram_0218Posted on 2005-11-02 at 08:44:05ID: 15209506

where (in1 is null or col1=in1) and (in2 is null or col2=in2)..

 

by: ram_0218Posted on 2005-11-02 at 08:44:49ID: 15209514

need not be a dynamic sql as stated in the previous posts., it can be a simple query as I mentioned above!!

 

by: vianiPosted on 2005-11-02 at 08:51:12ID: 15209578

I thought of the way what ram_0218 suggested, but was expecting something like what ploubier told.
Also, I will concatenate 'where' when any one of the parameter is not null, so that I coudl avoid 'instr' for checking where.
Thanks for the answer.

 

by: paquicubaPosted on 2005-11-02 at 09:47:09ID: 15210091

You can also try something like this:

CREATE OR REPLACE PROCEDURE GENERATE_WHERE_CLAUSE( P_1 IN VARCHAR2, P_2 VARCHAR2, P_3 VARCHAR2, P_4 VARCHAR2 )
IS
V_SELECT VARCHAR2(200) := 'SELECT * FROM TAB1'||CHR(10);
V_WHERE VARCHAR2(200) := 'WHERE ';
V_DEC VARCHAR2(200);
BEGIN
SELECT DECODE(P_1,NULL,NULL,'COL1='||P_1||CHR(10))||
DECODE(P_2,NULL,NULL,'AND COL2='||P_2||CHR(10))||
DECODE(P_3,NULL,NULL,'AND COL3='||P_3||CHR(10))||
DECODE(P_4,NULL,NULL,'AND COL4='||P_4) INTO V_DEC FROM DUAL;
V_WHERE := REPLACE(V_WHERE||V_DEC,'WHERE AND','WHERE');
IF V_DEC IS NULL THEN
V_WHERE := NULL;
END IF;
V_SELECT := V_SELECT||V_WHERE;
DBMS_OUTPUT.PUT_LINE( V_SELECT );
END;
/

Procedure created.

Elapsed: 00:00:00.04
TEST@PROD > EXEC GENERATE_WHERE_CLAUSE( NULL,NULL,NULL,NULL);

SELECT * FROM TAB1


PL/SQL procedure successfully completed.


TEST@PROD > EXEC GENERATE_WHERE_CLAUSE( NULL,NULL,NULL,4);

SELECT * FROM TAB1
WHERE COL4=4

PL/SQL procedure successfully completed.




TEST@PROD > EXEC GENERATE_WHERE_CLAUSE( NULL,NULL,3,4);

SELECT * FROM TAB1
WHERE COL3=3
AND COL4=4

PL/SQL procedure successfully completed.




TEST@PROD > EXEC GENERATE_WHERE_CLAUSE( NULL,2,3,4);

SELECT * FROM TAB1
WHERE COL2=2
AND COL3=3
AND COL4=4

PL/SQL procedure successfully completed.



TEST@PROD > EXEC GENERATE_WHERE_CLAUSE( 1,2,3,4);

SELECT * FROM TAB1
WHERE COL1=1
AND COL2=2
AND COL3=3
AND COL4=4

PL/SQL procedure successfully completed.


 

by: vianiPosted on 2005-11-02 at 12:31:58ID: 15211667

However your suggestion seems to be OK too. I've already coded as suggested by 'ploubier ' as it has got more readability. Thanks for your responses.

 

by: ploubierPosted on 2006-03-13 at 00:44:59ID: 16172214

My solution is not the most elegant but seems to satisfy the author...

 

by: RCorfmanPosted on 2006-03-13 at 00:49:58ID: 16172233

I try to read carefully, but I did miss the comment that they used your solution. Good enough, I'll leave it to the Mod.  I would note that you aren't using bind variables with dynamic sql, this is not a good practice, it is very hard on the shared pool. This was the primary reason that I thought ram_0218 should have been awarded - but I did miss the comment that they used your solution.

20120131-EE-VQP-002

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