/**
  批量循环备份用户数据库，做为数据库迁移临时用
*/

SET NOCOUNT ON

DECLARE @d varchar(8) 
DECLARE @Backup_Flag NVARCHAR(10)
 
SET @d=convert(varchar(8),getdate(),112) 

/***自定义选择备份哪些数据库****/
--SET @Backup_Flag='UserDB'      -- 所用的用户数据库
SET @Backup_Flag='AlwaysOnDB'    -- AlwaysOn 用户数据库

CREATE TABLE #T (ID INT NOT NULL IDENTITY(1,1),SQLBak NVARCHAR(MAX) NOT NULL)

IF @Backup_Flag='UserDB'
BEGIN 

  INSERT INTO #T (SQLBak)
  SELECT 
      'BACKUP DATABASE [' + name + '] TO DISK=''E:\Backup\' + NAME + '_Full_'+@d+'.bak'' WITH CHECKSUM,NOFORMAT,INIT,SKIP,COMPRESSION' AS 'SQLBak'
  FROM  sys.databases
  WHERE  database_id>4

END



IF @Backup_Flag='AlwaysOnDB' 
BEGIN 

  INSERT INTO #T (SQLBak)
  SELECT 
      'BACKUP DATABASE [' + database_name + '] TO DISK=''E:\Backup' + database_name + '_Full_'+@d+'.bak'' WITH CHECKSUM,NOFORMAT,INIT,SKIP,COMPRESSION' AS 'SQLBak'
  FROM  sys.availability_databases_cluster
END



DECLARE 
  @Minid INT ,
  @Maxid INT ,
  @sql VARCHAR(max)
SELECT @Minid = MIN(id) ,
    @Maxid = MAX(id)
FROM  #T

PRINT N'--打印备份脚本..........'


WHILE @Minid = @Maxid
  BEGIN
    SELECT @sql = SQLBak
    FROM  #T
    WHERE  id = @Minid
 ----exec (@sql)
    PRINT ( @sql )
    SET @Minid = @Minid + 1
  END

DROP TABLE #T