How do I create a stored procedure that will optionally search columns?

Question

I\'m working on an application for work that is going to query our employee database. The end users want the ability to search based on the standard name/department criteria

Answer 1

Copying this from my blog post:

USE [AdventureWorks]
GO

CREATE PROCEDURE USP_GET_Contacts_DynSearch
(
    -- Optional Filters for Dynamic Search
    @ContactID          INT = NULL, 
    @FirstName          NVARCHAR(50) = NULL, 
    @LastName           NVARCHAR(50) = NULL, 
    @EmailAddress       NVARCHAR(50) = NULL, 
    @EmailPromotion     INT = NULL, 
    @Phone              NVARCHAR(25) = NULL
)
AS
BEGIN
    SET NOCOUNT ON

    DECLARE
        @lContactID         INT, 
        @lFirstName         NVARCHAR(50), 
        @lLastName          NVARCHAR(50), 
        @lEmailAddress      NVARCHAR(50), 
        @lEmailPromotion    INT, 
        @lPhone             NVARCHAR(25)

    SET @lContactID         = @ContactID
    SET @lFirstName         = LTRIM(RTRIM(@FirstName))
    SET @lLastName          = LTRIM(RTRIM(@LastName))
    SET @lEmailAddress      = LTRIM(RTRIM(@EmailAddress))
    SET @lEmailPromotion    = @EmailPromotion
    SET @lPhone             = LTRIM(RTRIM(@Phone))

    SELECT
        ContactID, 
        Title, 
        FirstName, 
        MiddleName, 
        LastName, 
        Suffix, 
        EmailAddress, 
        EmailPromotion, 
        Phone
    FROM [Person].[Contact]
    WHERE
        (@lContactID IS NULL OR ContactID = @lContactID)
    AND (@lFirstName IS NULL OR FirstName LIKE '%' + @lFirstName + '%')
    AND (@lLastName IS NULL OR LastName LIKE '%' + @lLastName + '%')
    AND (@lEmailAddress IS NULL OR EmailAddress LIKE '%' + @lEmailAddress + '%')
    AND (@lEmailPromotion IS NULL OR EmailPromotion = @lEmailPromotion)
    AND (@lPhone IS NULL OR Phone = @lPhone)
    ORDER BY ContactID

END
GO