/**
    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