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Old September 30th, 2007, 02:25 AM
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I have a table


 CREATE TABLE [dbo].[Speech]
  [SpeechId] [int] IDENTITY(1,1) NOT NULL CONSTRAINT PkSpeech_SpeechId PRIMARY KEY,
  [UniqueName] [varchar](52) NOT NULL,
  [NativeName] [nvarchar](52) NOT NULL,
  [Place] [nvarchar](52) NOT NULL,
  [Type] [smallint] NOT NULL,
  [LanguageId] [char](2) NOT NULL CONSTRAINT FkSpeech_LanguageId FOREIGN KEY (LanguageId) REFERENCES Language(LanguageId) ON UPDATE CASCADE ON DELETE CASCADE,
  [SpeakerId] [int] NOT NULL CONSTRAINT FkSpeech_SpeakerId FOREIGN KEY (SpeakerId) REFERENCES Speaker(SpeakerId) ON DELETE CASCADE,
  [IsFavorite] [bit] NOT NULL,
  [IsVisible] [bit] NOT NULL,
  [CreatedDate] [datetime] NOT NULL DEFAULT GETDATE(),
  [ModifiedDate] [datetime] NULL

Now I want to search the Table Speech

Sometimes by : SpeechId
Sometimes by : SpeakerId
Sometimes by : LanguageId
Sometimes by : SpeechId And LanguageId
Sometimes by : SpeakerId And LanguageId

All can have conditions with IsVisible, IsFavorite and Type columns.

for example

I need all Speeches with
any particular SpeakerId and LanguageId
with IsVisible equals to true
and IsFvaorite No Matter
and Type equals to Audio

For these type of queries I think the solution is


 CREATE PROCEDURE [dbo].[sprocGetSpeech]

  @speechId int = NULL,
  @uniqueName varchar(52) = NULL,
  @nativeName nvarchar(52) = NULL,
  @place nvarchar(52) = NULL,
  @type smallint = NULL,
  @languageId char(2) = NULL,
  @speakerId int = NULL,
  @isFavorite bit = NULL,
  @isVisible bit = NULL


   SpeechId = @speechId
   AND UniqueName = CASE WHEN @uniqueName IS NULL THEN [UniqueName] ELSE @uniqueName END
   AND NativeName = CASE WHEN @nativeName IS NULL THEN [NativeName] ELSE @NativeName END
   AND Place = CASE WHEN @place IS NULL THEN [Place] ELSE @place END
   AND Type = CASE WHEN @type IS NULL THEN [Type] ELSE @type END
   AND LanguageId = CASE WHEN @languageId IS NULL THEN [LanguageId] ELSE @languageId END
   AND SpeakerId = CASE WHEN @speakerId IS NULL THEN [SpeakerId] ELSE @speakerId END
   AND IsFavorite = CASE WHEN @isFavorite IS NULL THEN [IsFavorite] ELSE @isFavorite END
   AND IsVisible = CASE WHEN @isVisible IS NULL THEN [IsVisible] ELSE @isVisible END

Can anyone tell me?

Is it right way to do?
Do you have any better solution?
If my solution is better then Is there any performance loss with that query?

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Old September 30th, 2007, 07:14 AM
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It looks about right but you can simplify the WHERE clause to get rid of the CASE statements:
(UniqueName = @UniqueName OR @UniqueName IS NULL)
So this part will be true if the UniqueName field matches the @UniqueName parameter or if the @UniqueName parameter is null.


Joe (Microsoft MVP - XML)
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