新旧数据库对比，自动生成更新语句

表结构比较：-------------------------------------------------------if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_comparestructure]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)drop procedure [dbo].[p_comparestructure]GO/*--比较两个数据库的表结构差异可以比较两个数据库的结构差异--邹建 2003.9(引用请保留此信息)--*//*--调用示例exec p_comparestructure '库1','库2'--*/create proc p_comparestructure@dbname1 varchar(250),--要比较的数据库名1@dbname2 varchar(250)--要比较的数据库名2ascreate table #tb1(表名1 varchar(250),字段名 varchar(250),序号 int,标识 bit,主键 bit,类型 varchar(250),占用字节数 int,长度 int,小数位数 int,允许空 bit,默认值 sql_variant,字段说明 sql_variant)create table #tb2(表名2 varchar(250),字段名 varchar(250),序号 int,标识 bit,主键 bit,类型 varchar(250),占用字节数 int,长度 int,小数位数 int,允许空 bit,默认值 sql_variant,字段说明 sql_variant)--得到数据库1的结构exec('insert into #tb1 SELECT 表名=d.name,字段名=a.name,序号=a.colid,标识=case when a.status=0x80 then 1 else 0 end,主键=case when exists(SELECT 1 FROM [email protected]+'..sysobjects where xtype=''PK'' and parent_obj=a.id and name in (SELECT name FROM [email protected]+'..sysindexes WHERE indid in(SELECT indid FROM [email protected]+'..sysindexkeys WHERE id = a.id AND colid=a.colid))) then 1 else 0 end,类型=b.name,占用字节数=a.length,长度=a.prec,小数位数=a.scale,允许空=a.isnullable,默认值=isnull(e.text,''''),字段说明=isnull(g.[value],'''')FROM [email protected]+'..syscolumns aleft join [email protected]+'..systypes b on a.xtype=b.xusertypeinner join [email protected]+'..sysobjects d on a.id=d.id  and d.xtype=''U'' and  d.name<>''dtproperties''left join [email protected]+'..syscomments e on a.cdefault=e.idleft join [email protected]+'..sysproperties g on a.id=g.id and a.colid=g.smallid  order by a.id,a.colorder')--得到数据库2的结构exec('insert into #tb2 SELECT 表名=d.name,字段名=a.name,序号=a.colid,标识=case when a.status=0x80 then 1 else 0 end,主键=case when exists(SELECT 1 FROM [email protected]+'..sysobjects where xtype=''PK'' and parent_obj=a.id and name in (SELECT name FROM [email protected]+'..sysindexes WHERE indid in(SELECT indid FROM [email protected]+'..sysindexkeys WHERE id = a.id AND colid=a.colid))) then 1 else 0 end,类型=b.name,占用字节数=a.length,长度=a.prec,小数位数=a.scale,允许空=a.isnullable,默认值=isnull(e.text,''''),字段说明=isnull(g.[value],'''')FROM [email protected]+'..syscolumns aleft join [email protected]+'..systypes b on a.xtype=b.xusertypeinner join [email protected]+'..sysobjects d on a.id=d.id  and d.xtype=''U'' and  d.name<>''dtproperties''left join [email protected]+'..syscomments e on a.cdefault=e.idleft join [email protected]+'..sysproperties g on a.id=g.id and a.colid=g.smallid  order by a.id,a.colorder')--and not exists(select 1 from #tb2 where 表名2=a.表名1)select 比较结果=case when a.表名1 is null and b.序号=1 then '库1缺少表：'+b.表名2when b.表名2 is null and a.序号=1 then '库2缺少表:'+a.表名1when a.字段名 is null and exists(select 1 from #tb1 where 表名1=b.表名2) then '库1 ['+b.表名2+'] 缺少字段：'+b.字段名when b.字段名 is null and exists(select 1 from #tb2 where 表名2=a.表名1) then '库2 ['+a.表名1+'] 缺少字段：'+a.字段名when a.标识<>b.标识 then '标识不同'when a.主键<>b.主键 then '主键设置不同'when a.类型<>b.类型 then '字段类型不同'when a.占用字节数<>b.占用字节数 then '占用字节数'when a.长度<>b.长度 then '长度不同'when a.小数位数<>b.小数位数 then '小数位数不同'when a.允许空<>b.允许空 then '是否允许空不同'when a.默认值<>b.默认值 then '默认值不同'when a.字段说明<>b.字段说明 then '字段说明不同'else '' end,*from #tb1 afull join #tb2 b on a.表名1=b.表名2 and a.字段名=b.字段名where a.表名1 is null or a.字段名 is null or b.表名2 is null or b.字段名 is null or a.标识<>b.标识 or a.主键<>b.主键 or a.类型<>b.类型or a.占用字节数<>b.占用字节数 or a.长度<>b.长度 or a.小数位数<>b.小数位数or a.允许空<>b.允许空 or a.默认值<>b.默认值 or a.字段说明<>b.字段说明order by isnull(a.表名1,b.表名2),isnull(a.序号,b.序号)--isnull(a.字段名,b.字段名)go