Learn more about SQL Server tools



solving sql server problems for millions of dbas and developers since 2006 join MSSQLTips for free SQL Server tips



















   Got a SQL tip?
            We want to know!


How to create a SQL Server stored procedure with parameters  

Overview
The real power of stored procedures is the ability to pass parameters and have the stored procedure handle the differing requests that are made.  In this topic we will look at passing parameter values to a stored procedure.

Explanation
Just like you have the ability to use parameters with your SQL code you can also setup your stored procedures to accept one or more parameter values.

One Parameter

In this example we will query the Person.Address table from the AdventureWorks database, but instead of getting back all records we will limit it to just a particular city.  This example assumes there will be an exact match on the City value that is passed.

CREATE PROCEDURE uspGetAddress @City nvarchar(30)
AS
SELECT * 
FROM AdventureWorks.Person.Address
WHERE City = @City
GO

To call this stored procedure we would execute it as follows:

EXEC uspGetAddress @City = 'New York'

We can also do the same thing, but allow the users to give us a starting point to search the data.  Here we can change the "=" to a LIKE and use the "%" wildcard.

CREATE PROCEDURE uspGetAddress @City nvarchar(30) 
AS 
SELECT * 
FROM AdventureWorks.Person.Address 
WHERE City LIKE @City + '%' 
GO

In both of the proceeding examples it assumes that a parameter value will always be passed. If you try to execute the procedure without passing a parameter value you will get an error message such as the following:

Msg 201, Level 16, State 4, Procedure uspGetAddress, Line 0

Procedure or function 'uspGetAddress' expects parameter '@City', which was not supplied.

Default Parameter Values

In most cases it is always a good practice to pass in all parameter values, but sometimes it is not possible.  So in this example we use the NULL option to allow you to not pass in a parameter value.  If we create and run this stored procedure as is it will not return any data, because it is looking for any City values that equal NULL.

CREATE PROCEDURE uspGetAddress @City nvarchar(30) = NULL
AS
SELECT *
FROM AdventureWorks.Person.Address
WHERE City = @City
GO

We could change this stored procedure and use the ISNULL function to get around this.  So if a value is passed it will use the value to narrow the result set and if a value is not passed it will return all records. (Note: if the City column has NULL values this will not include these values. You will have to add additional logic for City IS NULL)

CREATE PROCEDURE uspGetAddress @City nvarchar(30) = NULL
AS
SELECT *
FROM AdventureWorks.Person.Address
WHERE City = ISNULL(@City,City)
GO

Multiple Parameters

Setting up multiple parameters is very easy to do.  You just need to list each parameter and the data type separated by a comma as shown below.

CREATE PROCEDURE uspGetAddress @City nvarchar(30) = NULL, @AddressLine1 nvarchar(60) = NULL
AS
SELECT *
FROM AdventureWorks.Person.Address
WHERE City = ISNULL(@City,City)
AND AddressLine1 LIKE '%' + ISNULL(@AddressLine1 ,AddressLine1) + '%'
GO

To execute this you could do any of the following:

EXEC uspGetAddress @City = 'Calgary'
--or
EXEC uspGetAddress @City = 'Calgary', @AddressLine1 = 'A'
--or
EXEC uspGetAddress @AddressLine1 = 'Acardia'
-- etc...



 
Sponsor Information







Copyright (c) 2006-2014 Edgewood Solutions, LLC All rights reserved
privacy | disclaimer | copyright | advertise | about
authors | contribute | feedback | giveaways | free t-shirt | user groups | community | events | first timer?
Some names and products listed are the registered trademarks of their respective owners.