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An Easy Way to Get a File Name or a File Extension from a User Defined File Path using Transact-SQL

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9 Aug 2009CPOL1 min read 52.4K   120   28   4
This article will demonstrate how to get a file name or a file extension as well using Transact-SQL.

Introduction

This article will demonstrate how to get a file name or a file extension as well using Transact-SQL.

Background

Several times, developers need to get only the file name or file extension from a file path when they are working on storing the file in binary format into SQL server database, considering the file name and the file extension as a record for further references. Now a days, Microsoft .NET Framework provides some excellent methods for getting the file name or its extension as well. We can consider the scenario where I have an application, it may be windows or web, where I use Visual Basic 6.0 / vbScript and one of the new features will be to store a user defined file in binary format into SQL Server database. So we need to develop a function which will return the file name / extension. In this context, my concern is that it is also possible by using Transact–SQL.

Using the Code

Working with the code is very simple; if you look at the scripts you will see that I used a very common technique which is string reverse logic for doing this. I wrote two stored procedures:

  • dbo.spGetDocumentName
  • dbo.spGetDocumentNature

A sample code example is given below:

Example - 1

SQL
-- =============================================
-- Author: Md. Marufuzzaman>
-- Create date:
-- Description: Return the file name from a given location.
-- =============================================
/*
DECLARE @VAL VARCHAR(MAX) 
EXEC dbo.spGetDocumentName 'E:\Guideline & Programming Tools & _
    Resources\Resource - 2\Microsoft Visual Basic 6.0 Source\myFile.pdf', @VAL OUTPUT
PRINT @VAL
*/
CREATE PROCEDURE [dbo].[spGetDocumentName]
 -- Add the parameters for the stored procedure here
  @FILE_PATH   VARCHAR(MAX) 
 ,@NAME        VARCHAR(MAX) OUTPUT
AS
BEGIN
 -- SET NOCOUNT ON added to prevent extra result sets from
 -- interfering with SELECT statements.
 SET NOCOUNT ON;
--DECLARE @FILE_PATH VARCHAR(MAX)
DECLARE @FILE_LENGTH INT
DECLARE @FILE_NAME VARCHAR(MAX)
 
 SET @FILE_LENGTH = LEN(@FILE_PATH)
 WHILE (@FILE_LENGTH <> 0)
 BEGIN
  IF SUBSTRING(@FILE_PATH, @FILE_LENGTH, 1) = '\' 
   BEGIN
    SET @FILE_NAME = RIGHT(@FILE_PATH, LEN(@FILE_PATH) - @FILE_LENGTH)
    BREAK
   END
 SET @FILE_LENGTH = @FILE_LENGTH - 1
 END
   
 SET @NAME = @FILE_NAME
 RETURN 
END
GO

Example - 2

SQL
-- =============================================
-- Author: Md. Marufuzzaman>
-- Create date: 
-- Description: Return the nature of the file from a given location.
-- =============================================
/*
DECLARE @VAL VARCHAR(MAX) 
EXEC dbo.spGetDocumentNature'E:\Guideline & Programming Tools & _
    Resources\Resource - 2\Microsoft Visual Basic 6.0 Source\myFile.pdf', @VAL OUTPUT
PRINT @VAL
*/
CREATE PROCEDURE [dbo].[spGetDocumentNature]
 -- Add the parameters for the stored procedure here
  @FILE_PATH   VARCHAR(MAX) 
 ,@EXTN       VARCHAR(10) OUTPUT
AS
BEGIN
 -- SET NOCOUNT ON added to prevent extra result sets from
 -- interfering with SELECT statements.
 SET NOCOUNT ON;
--DECLARE @FILE_PATH VARCHAR(MAX)
DECLARE @FILE_LENGTH INT
DECLARE @FILE_NATURE VARCHAR(10)
 
 SET @FILE_LENGTH = LEN(@FILE_PATH)
 WHILE (@FILE_LENGTH <> 0)
 BEGIN
  IF SUBSTRING(@FILE_PATH, @FILE_LENGTH, 1) = '.' 
   BEGIN
    SET @FILE_NATURE = RIGHT(@FILE_PATH, LEN(@FILE_PATH) - @FILE_LENGTH)
    BREAK
   END
 SET @FILE_LENGTH = @FILE_LENGTH - 1
 END
    
 SET @EXTN = @FILE_NATURE
 RETURN 
END

Conclusion

I hope that you like it. Enjoy!

History

  • 9th August 2009: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)



Comments and Discussions

 
Generalget filename and filetype Pin
Member 51937911-Aug-09 1:53
Member 51937911-Aug-09 1:53 
GeneralRe: get filename and filetype Pin
Md. Marufuzzaman11-Aug-09 3:35
professionalMd. Marufuzzaman11-Aug-09 3:35 
GeneralInteresting Pin
spoodygoon9-Aug-09 6:50
spoodygoon9-Aug-09 6:50 
GeneralRe: Interesting Pin
Md. Marufuzzaman9-Aug-09 7:41
professionalMd. Marufuzzaman9-Aug-09 7:41 

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