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How to architect a function for Title Case?

Execute the following Microsoft SQL Server T-SQL script in SSMS Query Editor to create and populate a sequence table, to create a user-defined function for title casing a sentence and test it:

USE AdventureWorks

GO

 

CREATE TABLE dbo.Sequence11 (

  SeqNo INT    PRIMARY KEY)

GO

INSERT Sequence11

SELECT TOP 1000 ROW_NUMBER()

                   OVER(ORDER BY c1.name)

FROM   sys.columns c1

       CROSS JOIN sys.columns c2

GO

-- SQL Server user-defined function - UDF - SQL scalar function

-- SQL title case formatting function

CREATE FUNCTION fnTitleCase

               (@TextIn NVARCHAR(512))

RETURNS NVARCHAR(512)

AS

  BEGIN

    DECLARE  @TitleCase NVARCHAR(256)

    

    DECLARE  @TextInGrid  TABLE(

                                TextInput VARCHAR(256)    NOT NULL

                                )

    

    DECLARE  @Delimiters  TABLE(

                                Delimiter CHAR(1)    NOT NULL

                                )

    

    DECLARE  @WordExclusion  TABLE(

                                   Modifiers VARCHAR(20)    NOT NULL

                                   )

    

    INSERT @TextInGrid

    VALUES(@TextIn)

    

    INSERT @WordExclusion

          (Modifiers)

    SELECT ' the '

    UNION

    SELECT ' a '

    UNION

    SELECT ' an '

    UNION

    SELECT ' and '

    UNION

    SELECT ' with '

    UNION

    SELECT ' from '

    UNION

    SELECT ' off '

    UNION

    SELECT ' in '

    UNION

    SELECT ' on '

    UNION

    SELECT ' as '

    UNION

    SELECT ' into '

    UNION

    SELECT ' of '

    UNION

    SELECT ' to '

    

    INSERT @Delimiters

          (Delimiter)

    SELECT ' '

    UNION

    SELECT '-'

    UNION

    SELECT ''''

    

    SELECT @TitleCase = REPLACE((SELECT   CASE

                                            WHEN SeqNo = 1

                                                  OR (SUBSTRING(n.TextInput,SeqNo - 1,1) IN (SELECT Delimiter

                                                                                             FROM   @Delimiters)

                                                      AND NOT EXISTS (SELECT *

                                                                      FROM   @WordExclusion e

                                                                      WHERE  Modifiers = SUBSTRING(n.TextInput,SeqNo - 1,LEN(Modifiers) + 1))) THEN UPPER(SUBSTRING(n.TextInput,SeqNo,1))

                                            ELSE LOWER(SUBSTRING(n.TextInput,SeqNo,1))

                                          END AS [text()]

                                 FROM     Sequence11

                                 WHERE    SeqNo <= LEN(n.TextInput)

                                 ORDER BY SeqNo

                                 FOR XML PATH( '' )),'&#x20;',' ')

    FROM   @TextInGrid n

    

    RETURN @TitleCase

  END

 

GO

 

SELECT TextInTitleCase = dbo.TitleCase('Latest Microsoft products driving hardware innovation and platform opportunity')

 

GO

/* Result

 

TextInTitleCase

Latest Microsoft Products Driving Hardware Innovation and Platform Opportunity

 

*/

-- Cleanup

DROP TABLE dbo.Sequence11

Related article:

SQL Server User-defined Functions

 

Exam Prep 70-461
Exam 70-461