Question

How to pass parameter values in MS SQL 2008 SP to conduct search query on only passed parameter values

Asked by: Glen_D

Having a hard time and I think this is easy....

I have parameters

@Test varchar
@Test1 varchar
@Test2 varchar

I have a select statment

Select test, test1, test2 from tbl_test  
where -- I match the data from the parameters
@Test = Test and
@Test1 = Test1 and
@Test2 = Test2

If the user does not pass any values for the test1 parameter, then the result set should be:

All data from the Test field and the Test2 fields only.  

What am I missing here...thx

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Asked On
2009-02-05 at 11:57:01ID24117049
Tags

MS SQL 2005/2008

Topics

SQL Server 2008

,

SQL Server 2005

Participating Experts
2
Points
500
Comments
10

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Answers

 

by: maradamPosted on 2009-02-05 at 12:03:22ID: 23563499

you need to assign default values for parameters and rewrite your query like this

create procedure test @Test1 int = NULL, @Test2 int = NULL, @Test3 int = NULL
as
select * from tblTest where (test1 = @Test1 or @Test1 is null)
and (test2 = @Test2 or test2 is null)
and (test3 = @Test3 or test3 is null)

This would be rather slow - in most cases optimizer will produce a scan but it should work as you expect. you can also make if else logic and omit clauses with nulls. It should work fast if you pass not nulls in params but it needs soma copy-paste'ing.

 

by: Glen_DPosted on 2009-02-05 at 12:05:45ID: 23563533

THx...could you give me an ex of the if else logic.. Glen

 

by: maradamPosted on 2009-02-05 at 12:09:31ID: 23563560

Sure

create procedure test @Test1 int = null, @Test2 int = null
as
if @Test1 is not null and @Test2 is not null
select * from tblTest where Test1 = @Test1 and Test2 = @Test2
else
if @Test1 is not null and @Test2 is null
select * from tblTest where test1 = @Test1
else
if @Test1 is null and @Test2 is not null
select * from tblTest where test2 = @Test2
else
if @Test2 is null and @Test1 is null
select * from tblTest

More params -> more copy-pasting :). Use with care then.

 

by: maradamPosted on 2009-02-05 at 12:18:36ID: 23563669

Well. You can also use dynamic SQL to build the query and add only where conditions for params with not null values. But you should be aware on sql injection and query recompilation on every use. As an ultimate solution you can generate the procedure code to apply if else logic automatically.

 

by: Glen_DPosted on 2009-02-05 at 12:21:17ID: 23563703

Thx...working on this now...I'll let you know; I have quite a few fields so this may take some time.

 

by: BrandonGalderisiPosted on 2009-02-05 at 12:35:36ID: 23563876

You want to test the NULL of the variable before evaluating the table.  Here's how to do it.

create procedure test @Test1 int = NULL, @Test2 int = NULL, @Test3 int = NULL
as
select * from tblTest 
where (@test1 is null or test1 = @Test1)
and (@test2 is null or test2 = @Test2)
and (@test3 is null or test3 = @Test3)

                                              
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Select allOpen in new window

 

by: Glen_DPosted on 2009-02-05 at 12:41:11ID: 23563945

wait  .. I have 25 parameters in the search;

Pls look at this small amount of code:

ALTER PROCEDURE [dbo].[usp_Search1]

@Program varchar (50) = Test,
@Project varchar (255) = tt,
@Center varchar (50) = ttt,
@Facility_Name varchar (255) = NULL

AS
BEGIN

      SET NOCOUNT ON;

Select p.Program, p.Project, p.Center, f.Facility_Name from tbl_Program p join tbl_Facility f on p.MainId = f.MainId
where
@Program = p.Program and
@Project = p.Project and
@Center = p.Center and
@Facility_Name is not null or @Facility_Name = f.Facility_Name

end

I defaulted the Facility_Name para to NULL and then the code bombs and I receive no results; is there another way..I should be receiving all data in the Facility_Name field

 

by: Glen_DPosted on 2009-02-05 at 12:43:25ID: 23563981

whooops hold on Brian...saw your input after I submitted last statement

thx

 

by: Glen_DPosted on 2009-02-05 at 12:49:15ID: 23564060

OK...please look at this code:  I have values for the first 3 para; none for the last 2.  I should be receiving all data for the first 3.  What am I missing?  Thx


ALTER PROCEDURE [dbo].[usp_Search1]

@Program varchar (50) = TTT,
@Project varchar (255) = TT,
@Center varchar (50) = T,
@Facility_Name varchar (255)= NULL,
@BuildNos varchar (255) = NULL

AS
BEGIN

      SET NOCOUNT ON;

Select p.Program, p.Project, p.Center, f.Facility_Name, f.Building_Nos as 'Building Numbers'
from tbl_Program p join tbl_Facility f on p.MainId = f.MainId
where
(@Program is null or p.Program = @Program)
and (@Project is null or p.Project = @Program)
and (@Center is null or p.Center = @Center)
and (@Facility_Name is null or f.Facility_Name = @Facility_Name)
and (@BuildNos is null or f.Building_Nos = @BuildNos)



end

 

by: Glen_DPosted on 2009-02-05 at 12:50:14ID: 23564073

Disregard...I found my error...thx

20120131-EE-VQP-002

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