SQL Server

File Existence Check

See more FTP Examples

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @ftp int
    EXEC @hr = sp_OACreate 'Chilkat.Ftp2', @ftp OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @ftp, 'Hostname', 'ftp.example.com'
    EXEC sp_OASetProperty @ftp, 'Username', 'username'
    EXEC sp_OASetProperty @ftp, 'Password', 'password'

    -- Connect and login to the FTP server.
    EXEC sp_OAMethod @ftp, 'Connect', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ftp
        RETURN
      END

    -- Set the current remote directory to where the file is located:
    EXEC sp_OAMethod @ftp, 'ChangeRemoteDir', @success OUT, 'something'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ftp
        RETURN
      END

    -- Test to see if the file exists by getting the file size by name. 
    -- If a -1 is returned, the file does not exist.
    DECLARE @fileSize int
    EXEC sp_OAMethod @ftp, 'GetSizeByName', @fileSize OUT, 'test123.txt'
    IF @fileSize < 0
      BEGIN

        PRINT 'file does not exist'
      END
    ELSE
      BEGIN


        PRINT 'file exists and is ' + @fileSize + ' bytes in size'
      END

    EXEC sp_OAMethod @ftp, 'Disconnect', @success OUT

    EXEC @hr = sp_OADestroy @ftp


END
GO