May 16, 2014 at 3:33 pm
I am trying to modify a script that to back databsae in t-sql.
I put it in a stored procedure with one paramenter dbname.
I would like if a dbname is passed when calling the sproc, it will only backup this database, if no paramenter is entered, the dbname is null, then backup all user databases- no system databases.
But I have difficulty to define this two situations in code.
Below is the sproc:
CREATE PROCEDURE [dbo].[BackupDB]
@dbname varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @name VARCHAR(50) -- database name
DECLARE @path VARCHAR(256) -- path for backup files
DECLARE @fileName VARCHAR(256) -- filename for backup
DECLARE @fileDate VARCHAR(20) -- used for file name
-- specify database backup directory
SET @path = 'G:\Backup\'
-- specify filename format
--SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) only date if also time use below
-- specify filename format
SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) + REPLACE(CONVERT(VARCHAR(20),GETDATE(),108),':','')
DECLARE db_cursor CURSOR FOR
SELECT name
FROM master.dbo.sysdatabases
WHERE name NOT IN ('master','model','msdb','tempdb') -- exclude these databases
AND name = @dbname
OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @name
WHILE @@FETCH_STATUS = 0
BEGIN
SET @fileName = @path + @name +'\'+@name + '_' + @fileDate + '.BAK'
BACKUP DATABASE @name TO DISK = @fileName
FETCH NEXT FROM db_cursor INTO @name
END
CLOSE db_cursor
DEALLOCATE db_cursor
END
May 16, 2014 at 3:47 pm
I found a solution using
AND name =ISNULL(@dbname, name)
that seems working fine.
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