how to write a dynamic query in sql

Question

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SQL-Server-2005

SQL

BEGIN
    DECLARE @CAMP VARCHAR(2)
    DECLARE @TYPE VARCHAR(10)
    SET @TYPE=''
    SET @CAMP=''
    DECLARE @QRY NVARCHAR(300)
    SET @QRY='SELECT * FROM [dbo].[LIBMAST ] WHERE '
    IF(@CAMP<>'')
    BEGIN
        SET @QRY=@QRY+'CAMPUS='+@CAMP+'AND '
    END
    IF(@TYPE<>'')
    BEGIN
        SET @QRY=@QRY+'TYPE= '+@TYPE
    END
    EXEC(@QRY)
END

in this case when both parameter is empty then error showing "Incorrect syntax near 'WHERE'".
when @TYPE parameter is empty and @CAMP have values hsowing error "
Incorrect syntax near 'AND'".
please help me.

Posted 21-Feb-13 18:16pm

josh-jw

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4 solutions

Solution 2

Please replace as below

SQL

DECLARE @CAMP VARCHAR(2)
    DECLARE @TYPE VARCHAR(10)
    SET @TYPE=''
    SET @CAMP='g'
    DECLARE @QRY NVARCHAR(300)

SET @QRY='SELECT * FROM [dbo].[LIBMAST ]'
IF(@CAMP <> '')
BEGIN
SET @QRY=@QRY+ ' WHERE CAMPUS='''+@CAMP+'''' 
IF (@TYPE <> '')
BEGIN
SET @QRY=@QRY+ ' AND TYPE= '''+@TYPE + ''''
END
END
ELSE IF  (@TYPE <> '')
BEGIN
SET @QRY=@QRY+ ' WHERE TYPE= '''+@TYPE + ''''
END
    exec(@QRY)

Posted 21-Feb-13 18:26pm

maxrockM

Updated 21-Feb-13 23:05pm

v2

Comments

josh-jw 22-Feb-13 0:30am

in my query if @CAMP is '' ,no need where condition,means have to select all records.same in the case of @TYPE.

maxrockM 22-Feb-13 5:06am

Check My Update

Solution 1

Change the below code

SQL

SET @QRY=@QRY+'CAMPUS='+@CAMP+'AND '

to

SQL

SET @QRY=@QRY+'CAMPUS='+@CAMP+' AND '

Space before "AND"

Thanks
--RA

Posted 21-Feb-13 18:18pm

Rajesh Anuhya

Updated 21-Feb-13 18:49pm

v3

Comments

josh-jw 22-Feb-13 0:22am

yes did.but same error showing like "Incorrect syntax near 'AND'".
here in this case when @camp have value and @type is empty query is like select * from libmast where campus='05' and .

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gvprabu · Accepted Answer · 2013-02-21T18:50:00

Solution 4

hi,

For Dynamic Query... Check the link
Execute Dynamic SQL commands in SQL Server[^]

Regards,
GVPrabu

Posted 21-Feb-13 18:50pm

gvprabu

S. M. Ahasan Habib · Accepted Answer · 2013-02-21T18:34:00

Solution 3

you can write it as follows

SQL

BEGIN
    DECLARE @CAMP VARCHAR(2)
    DECLARE @TYPE VARCHAR(10)
    SET @TYPE='';
    SET @CAMP=''
    DECLARE @QRY NVARCHAR(300)
    SET @QRY='SELECT * FROM [dbo].[LIBMAST ] WHERE (1=1)';
    IF(@CAMP<>'')
    BEGIN
        SET @QRY=@QRY+' AND CAMPUS='''+@CAMP + '''';
    END
    IF(@TYPE<>'')
    BEGIN
        SET @QRY=@QRY + ' AND TYPE= '''+@TYPE + '''';
    END
    EXEC SP_ExecuteSql @QRY;
END

Just use (1=1) always true trick.

Posted 21-Feb-13 18:34pm

S. M. Ahasan Habib

Updated 21-Feb-13 18:51pm

v8

Comments

josh-jw 22-Feb-13 0:44am

in this query if i give any value to @TYPE like
set @TYEP='ABC' .then error showing invalid column name 'ABC'

S. M. Ahasan Habib 22-Feb-13 0:52am

Pls check it again, I update the code and test it and found it is working.
BEGIN
DECLARE @CAMP VARCHAR(2)
DECLARE @TYPE VARCHAR(10)
SET @TYPE='sdfas';
SET @CAMP='asdfasd'
DECLARE @QRY NVARCHAR(300)
SET @QRY='SELECT * FROM [dbo].[Target] WHERE (1=1)';
IF(@CAMP<>'')
BEGIN
SET @QRY=@QRY+' AND FirstName='''+@CAMP + '''';
END
IF(@TYPE<>'')
BEGIN
SET @QRY=@QRY + ' AND LastName= '''+@TYPE + '''';
END
EXEC SP_ExecuteSql @QRY;
END

josh-jw 22-Feb-13 1:05am

THANKS

maxrockM 22-Feb-13 5:08am

(1=1) is a hack and you can avoid it in your case by using method in my updated solution