/*--备份指定表到另一数据库

    备份指定数据库中的指定表列表到一个新的数据库

--邹建 2003.12--*/

/*--调用示例
    --备份数据当前数据库的所有内容
    exec p_backupdatabase
    
    --备份当前数据库的指定表
    exec p_backupdatabase @tblist='tb,tb1,tb2'
--*/

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_BackupDataBase]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_BackupDataBase]
GO

CREATE PROCEDURE p_BackupDataBase
@s_dbname sysname='',            --要备份的数据库名,如果不指定,则备份当前数据库
@d_dbname sysname='',            --备份生成的数据库名,如果不指定,则为:@s_dbname+'_bak'
@tblist varchar(8000)=''        --要备份的表名列表,如果不指定,则表示所有用户表
AS
declare @sql varchar(8000),@err_msg varchar(1000)

--参数检测
if isnull(@s_dbname,'')='' set @s_dbname=db_name()
if isnull(@d_dbname,'')='' set @d_dbname=@s_dbname+'_bak'
if exists(select 1 from master..sysdatabases where name=@d_dbname)
begin
    set @err_msg='备份的数据库 ['+@d_dbname+'] 已经存在!'
    goto lb_exit
end
if not exists(select 1 from master..sysdatabases where name=@s_dbname)
begin
    set @err_msg='要备份的数据库 ['+@d_dbname+'] 不存在!'
    goto lb_exit
end

--创建备份的数据库
set @sql='create database ['+@d_dbname+']'
exec(@sql)

--备份表
declare @tbname sysname
set @sql='declare tb cursor for
select name from ['+@s_dbname+']..sysobjects 
where status>0 and xtype=''U'''
+case isnull(@tblist,'') when '' then '' 
    else ' and name in('''+replace(@tblist,',',''',''')+''')' end
exec(@sql)
open tb
fetch next from tb into @tbname
while @@fetch_status=0
begin
    set @sql='select * into ['+@d_dbname+']..['+@tbname
        +'] from ['+@s_dbname+']..['+@tbname+']'
    exec(@sql)
    fetch next from tb into @tbname
end
close tb
deallocate tb

lb_exit:
    if @err_msg<>'' raiserror(@err_msg,1,16)
go