SQL Server

Check if File Exists

See more SFTP Examples

Demonstrates how to check to see if a file exists. 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 assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    -- Connect to the SSH server.  
    DECLARE @hostname nvarchar(4000)
    SELECT @hostname = 'sftp.example.com'
    DECLARE @port int
    SELECT @port = 22
    EXEC sp_OAMethod @sftp, 'Connect', @success OUT, @hostname, @port
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- Authenticate with the SSH server.  Chilkat SFTP supports
    -- both password-based authenication as well as public-key
    -- authentication.  This example uses password authenication.
    EXEC sp_OAMethod @sftp, 'AuthenticatePw', @success OUT, 'myLogin', 'myPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- After authenticating, the SFTP subsystem must be initialized:
    EXEC sp_OAMethod @sftp, 'InitializeSftp', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- Check to see if a file exists

    -- The return value is one of the following values:
    -- -1: Unable to check. Examine the LastErrorText to determine the reason for failure.
    -- 0: File does not exist.
    -- 1: The regular file exists.
    -- 2: It exists, but it is a directory.
    -- 3: It exists, but it is a symlink (only possible if followLinks is false)
    -- 4: It exists, but it is a special filesystem entry type.
    -- 5: It exists, but it is an unkown filesystem entry type.
    -- 6: It exists, but it is an socket filesystem entry type.
    -- 7: It exists, but it is an char device entry type.
    -- 8: It exists, but it is an block device entry type.
    -- 9: It exists, but it is an FIFO entry type.

    DECLARE @followLinks int
    SELECT @followLinks = 1
    DECLARE @status int
    EXEC sp_OAMethod @sftp, 'FileExists', @status OUT, 'someDir/someFile.txt', @followLinks
    IF @status < 0
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END


    PRINT 'status = ' + @status


    PRINT 'Success'

    EXEC @hr = sp_OADestroy @sftp


END
GO