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

2. Add a Computed Column: Add a computed column named IsExists of type BIT to your table with the following expression:

dbo.fn_FileExists(filepath)

3. Query the Table: To check for file existence, simply query the table:

SELECT * FROM dbo.MyTable WHERE IsExists = 1;

4. 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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