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How Can I Check for File Existence in SQL Server Using a Function?

Linda Hamilton
Linda HamiltonOriginal
2024-12-24 08:00:23125browse

How Can I Check for File Existence in SQL Server Using a Function?

Check for File Existence in SQL Server Using a Function

To determine if a file exists on your local machine using SQL Server, you can employ the following approach:

  1. Create a Function: Define a function that takes a file path as input and returns a bit value indicating its existence.
CREATE FUNCTION dbo.fn_FileExists(@path varchar(512))
RETURNS BIT
AS
BEGIN
     DECLARE @result INT
     EXEC master.dbo.xp_fileexist @path, @result OUTPUT
     RETURN cast(@result as bit)
END;
GO
  1. Add a Computed Column: Add a computed column named IsExists of type BIT to your table with the following expression:
dbo.fn_FileExists(filepath)
  1. Query the Table: To check for file existence, simply query the table:
SELECT * FROM dbo.MyTable WHERE IsExists = 1;
  1. Use the Function Outside Computed Column: You can also use the function outside a computed column by calling it directly in your query:
SELECT id, filename, dbo.fn_FileExists(filename) AS IsExists
FROM dbo.MyTable;

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