SQLServer数据库从高版本降级到低版本实例详解

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SQLServer数据库从高版本降级到低版本实例详解由于目前还广泛使用着SQLServer2000，很多公司又想使用新的SQLServer，从而直接【分离/附加】或者【备份/还原】数据库，在不同版本之间存放。往往就会遇到版本不兼容的问题

SQLServer 数据库从高版本降级到低版本实例详解

由于目前还广泛使用着SQLServer2000，很多公司又想使用新的SQLServer，从而直接【分离/附加】或者【备份/还原】数据库，在不同版本之间存放。往往就会遇到版本不兼容的问题。前几天遇到了从我本机2008R2上备份的一个数据库还原到2008上面时报错：

从运行版本10.50.2500（2008R2是10.50）和10.00.1600（2008是10.00）中可以看出这个版本不兼容问题，大部分情况下，从低版本升级到高版本，只要不是跨度太大，如2000升级到2012，都不会怎么报错。除非使用了一些新版本不兼容的特性如*=来实现left join的语句。但是就像上图那样，从高版本还原到低版本的时候，问题就出现了，而且几乎一定会报错。

下面给出几个小建议，例子是从2008 降级到2005：

方法一：使用图形化操作（GUI），打开SSMS(SQL Server Management Studio)

步骤1：右键你要降级的数据库，按下图选择：

步骤2：在对话框中选择：

步骤3：在【高级】中选择下图：

步骤4：把脚本保存起来，然后在SQLServer2005中运行脚本。

详细步骤可以看：http://bbs.csdn.net/topics/390438560?page=1#post-394316973 中的13楼的回复，有截图

步骤5：通过【任务】→【导入数据】，把数据从2008导入到使用脚本创建的库上如下图，就完成了：

方法二：使用系统自带的存储过程实现：sp_dbcmptlevel ——将某些数据库行为设置为与指定的 SQL Server 版本兼容

下面是其内部实现代码：

SET QUOTED_IDENTIFIER ON  SET ANSI_NULLS ON  GO  create procedure sys.sp_dbcmptlevel      -- 1997/04/15   @dbname sysname = NULL,         -- database name to change   @new_cmptlevel tinyint = NULL OUTPUT  -- the new compatibility level to change to  as   set nocount  on     declare @exec_stmt nvarchar(max)   declare @returncode int   declare @comptlevel float(8)   declare @dbid int          -- dbid of the database   declare @dbsid varbinary(85)    -- id of the owner of the database   declare @orig_cmptlevel tinyint   -- original compatibility level   declare @input_cmptlevel tinyint  -- compatibility level passed in by user     ,@cmptlvl80 tinyint       -- compatibility to SQL Server Version 8.0     ,@cmptlvl90 tinyint       -- compatibility to SQL Server Version 9.0     ,@cmptlvl100 tinyint        -- compatibility to SQL Server Version 10.0   select @cmptlvl80 = 80,       @cmptlvl90 = 90,       @cmptlvl100 = 100     -- SP MUST BE CALLED AT ADHOC LEVEL --   if (@@nestlevel > 1)   begin     raiserror(15432,-1,-1,'sys.sp_dbcmptlevel')     return (1)   end     -- If no @dbname given, just list the valid compatibility level values.   if @dbname is null   begin     raiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)     return (0)   end     -- Verify the database name and get info   select @dbid = dbid, @dbsid = sid ,@orig_cmptlevel = cmptlevel     from master.dbo.sysdatabases     where name = @dbname     -- If @dbname not found, say so and list the databases.   if @dbid is null   begin     raiserror(15010,-1,-1,@dbname)     print ' '     select name as 'Available databases:'       from master.dbo.sysdatabases     return (1)   end     -- Now save the input compatibility level and initialize the return clevel   -- to be the current clevel   select @input_cmptlevel = @new_cmptlevel   select @new_cmptlevel = @orig_cmptlevel     -- If no clevel was supplied, display and output current level.   if @input_cmptlevel is null   begin     raiserror(15054, -1, -1, @orig_cmptlevel)     return(0)   end     -- If invalid clevel given, print usage and return error code   -- 'usage: sp_dbcmptlevel [dbname [, compatibilitylevel]]'   if @input_cmptlevel not in (@cmptlvl80, @cmptlvl90, @cmptlvl100)   begin     raiserror(15416, -1, -1)     print ' '     raiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)     return (1)   end     -- Only the SA or the dbo of @dbname can execute the update part   -- of this procedure sys.so check.   if (not (is_srvrolemember('sysadmin') = 1)) and suser_sid() <> @dbsid     -- ALSO ALLOW db_owner ONLY IF DB REQUESTED IS CURRENT DB     and (@dbid <> db_id() or is_member('db_owner') <> 1)   begin     raiserror(15418,-1,-1)     return (1)   end     -- If we're in a transaction, disallow this since it might make recovery impossible.   set implicit_transactions off   if @@trancount > 0   begin     raiserror(15002,-1,-1,'sys.sp_dbcmptlevel')     return (1)   end     set @exec_stmt = 'ALTER DATABASE ' + quotename(@dbname, '[') + ' SET COMPATIBILITY_LEVEL = ' + cast(@input_cmptlevel as nvarchar(128))     -- Note: database @dbname may not exist anymore   exec(@exec_stmt)     select @new_cmptlevel = @input_cmptlevel     return (0) -- sp_dbcmptlevel  GO

语法

sp_dbcmptlevel [ [ @dbname = ] name ] [ , [ @new_cmptlevel = ] version ]

参数

[ @dbname = ] name

要为其更改兼容级别的数据库的名称。数据库名称必须符合标识符的规则。name 的数据类型为 sysname，默认值为 NULL。

[ @new_cmptlevel = ] version

数据库要与之兼容的 SQL Server 的版本。version 的数据类型为 tinyint，默认值为 NULL。该值必须为下列值之一：

80 = SQL Server 2000

90 = SQL Server 2005

100 = SQL Server 200

返回代码值

0（成功）或 1（失败）

注意事项：

后续版本的 Microsoft SQL Server 将删除该功能。请不要在新的开发工作中使用该功能，并尽快修改当前还在使用该功能的应用程序。改为使用 ALTER DATABASE 兼容级别。

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标签: 版本 SQLServer 数据库从高降级实例详解

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