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-- OBJECT NAME	        : isp_Backup
--
-- AUTHOR               : Tara Duggan
-- DATE			: December 18, 2003
--
-- INPUTS		: @Path - location of the backups
--			  @dbType - which databases to backup - All, System, or User
-- OUTPUTS		: None
-- DEPENDENCIES	        : None
--
-- DESCRIPTION	        : This stored procedure performs a full backup on all of the user databases
--
-- EXAMPLES (optional)  : EXEC isp_Backup @Path = 'C:\MSSQL\Backup\', @dbType = 'All'
--
-- MODIFICATION HISTORY :
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-- 
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CREATE          PROC isp_Backup
(@Path VARCHAR(100), @dbType VARCHAR(6))
AS

SET NOCOUNT ON

DECLARE @Now CHAR(14) -- current date in the form of yyyymmddhhmmss
DECLARE @DBName SYSNAME -- stores the database name that is currently being processed
DECLARE @cmd SYSNAME -- stores the dynamically created DOS command
DECLARE @Result INT -- stores the result of the dir DOS command
DECLARE @RowCnt INT -- stores @@ROWCOUNT
DECLARE @filename VARCHAR(200) -- stores the path and file name of the BAK file

CREATE TABLE #WhichDatabase
(
	dbName SYSNAME NOT NULL
)

-- Get the list of the databases to be backed up
IF @dbType = 'All'

	INSERT INTO #WhichDatabase (dbName)
	SELECT [name]
	FROM master.dbo.sysdatabases
	WHERE [name] <> 'tempdb'
	ORDER BY [name]

ELSE
BEGIN

	IF @dbType = 'System'

		INSERT INTO #WhichDatabase (dbName)
		SELECT [name]
		FROM master.dbo.sysdatabases
		WHERE [name] IN ('master', 'model', 'msdb')
		ORDER BY [name]

	ELSE
	BEGIN

		IF @dbType = 'User'

			INSERT INTO #WhichDatabase (dbName)
			SELECT [name]
			FROM master.dbo.sysdatabases
			WHERE [name] NOT IN ('master', 'model', 'msdb', 'tempdb')
			ORDER BY [name]

		ELSE
		BEGIN

			DROP TABLE #WhichDatabase

			RETURN -1

		END

	END

END

-- Get the database to be backed up
SELECT TOP 1 @DBName = dbName
FROM #WhichDatabase

SET @RowCnt = @@ROWCOUNT

-- Iterate throught the temp table until no more databases need to be backed up
WHILE @RowCnt <> 0
BEGIN 

	-- Get the current date using style 120, remove all dashes, spaces, and colons
	SELECT @Now = REPLACE(REPLACE(REPLACE(CONVERT(VARCHAR(50), GETDATE(), 120), '-', ''), ' ', ''), ':', '')

	-- Build the .BAK path and file name
	SELECT @filename = @Path + @DBName + '\' + @DBName + '_' + @Now + '.BAK'
	
	-- Build the dir command that will check to see if the directory exists
	SELECT @cmd = 'dir ' + @Path + @DBName

	-- Run the dir command, put output of xp_cmdshell into @result
	EXEC @result = master.dbo.xp_cmdshell @cmd

	-- If the directory does not exist, we must create it
	IF @result <> 0
	BEGIN
		
		-- Build the mkdir command		
		SELECT @cmd = 'mkdir ' + @Path + @DBName

		-- Create the directory
		EXEC master.dbo.xp_cmdshell @cmd, NO_OUTPUT

	END
	-- The directory exists, so let's delete files older than two days
	ELSE
	BEGIN

		-- Stores the name of the file to be deleted
		DECLARE @WhichFile VARCHAR(1000)

		CREATE TABLE #DeleteOldFiles
		(
			DirInfo VARCHAR(7000)
		)

		-- Build the command that will list out all of the files in a directory
		SELECT @cmd = 'dir ' + @Path + @DBName + ' /OD'

		-- Run the dir command and put the results into a temp table
		INSERT INTO #DeleteOldFiles
		EXEC master.dbo.xp_cmdshell @cmd

		-- Delete all rows from the temp table except the ones that correspond to the files to be deleted
		DELETE 
		FROM #DeleteOldFiles
		WHERE ISDATE(SUBSTRING(DirInfo, 1, 10)) = 0 OR DirInfo LIKE '%<DIR>%' OR SUBSTRING(DirInfo, 1, 10) >= GETDATE() - 2

		-- Get the file name portion of the row that corresponds to the file to be deleted
		SELECT TOP 1 @WhichFile = SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo)) 
		FROM #DeleteOldFiles

		
		SET @RowCnt = @@ROWCOUNT
		
		-- Interate through the temp table until there are no more files to delete
		WHILE @RowCnt <> 0
		BEGIN
		
			-- Build the del command
			SELECT @cmd = 'del ' + @Path + + @DBName + '\' + @WhichFile + ' /Q /F'
			
			-- Delete the file
			EXEC master.dbo.xp_cmdshell @cmd, NO_OUTPUT
			
			-- To move to the next file, the current file name needs to be deleted from the temp table
			DELETE
			FROM #DeleteOldFiles
			WHERE SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo))  = @WhichFile

			-- Get the file name portion of the row that corresponds to the file to be deleted
			SELECT TOP 1 @WhichFile = SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo)) 
			FROM #DeleteOldFiles
		
			SET @RowCnt = @@ROWCOUNT
		
		END
		
		DROP TABLE #DeleteOldFiles

	END

	-- Backup the database
	BACKUP DATABASE @DBName
	TO DISK = @filename
	WITH INIT

	-- To move onto the next database, the current database name needs to be deleted from the temp table
	DELETE
	FROM #WhichDatabase
	WHERE dbName = @DBName

	-- Get the database to be backed up
	SELECT TOP 1 @DBName = dbName
	FROM #WhichDatabase

	SET @RowCnt = @@ROWCOUNT
	
	-- Let the system rest for 5 seconds before starting on the next backup
	WAITFOR DELAY '00:00:05'

END

DROP TABLE #WhichDatabase

SET NOCOUNT OFF

RETURN 0