知识点：
1获取数据库结构
2添加表说明
3添加字段说明
4导出excel
源码：
说明文档：
主要代码：
--1)查询所有表 select * from (select top 100000000 ROW_NUMBER() OVER(ORDER BY m.name) as '序号',m.name as '表名',(SELECT isnull(A.value,'')as value FROM sys.extended_properties ALEFT JOIN sys.columns B ON A.major_id=B.object_id AND A.minor_id=B.column_idLEFT JOIN sys.tables C ON A.major_id=C.object_idWHERE A.class=1 AND C.name=m.name and isnull(B.name,'')='') as '表说明'FROM sysobjects AS mWHERE (m.type = 'u')--and m.name='Fx_Taobao_Fxs'--{ 2}ORDER BY m.name)A--where A.序号>0 and A.序号<=100--2) 查询数据库结构：----查询结构SELECT 表名=case when a.colorder=1 then d.name else '' end, 表说明=case when a.colorder=1 then isnull(f.value,'') else '' end, 字段序号=a.colorder, 字段名=a.name, 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end, 主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in ( SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid ))) then '√' else '' end, 类型=b.name, 占用字节数=a.length, 长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'), 小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0), 允许空=case when a.isnullable=1 then '√'else '' end, 默认值=isnull(e.text,''), 字段说明=isnull(g.[value],'')FROM syscolumns a left join systypes b on a.xusertype=b.xusertype inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' left join syscomments e on a.cdefault=e.id left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id left join sys.extended_properties f on d.id=f.major_id and f.minor_id=0where d.name='MERCHANDISECOMMENT' --如果只查询指定表,加上此条件order by a.id,a.colorder--3) 添加表说明sql语句：--------------------------[Account_Type] 添加表说明：账号类型表--删除旧说明declare @name nvarchar(50)select @name=a.name from sys.extended_properties A left join sys.columns B on A.major_id = B.object_id and A.minor_id = B.column_id left join sys.tables C on A.major_id = C.object_id where A.class = 1 and C.name = 'Account_Type' and isnull(B.name, '') = '' print @name if(@name<>'') begin execute sp_dropextendedproperty @name,'user','dbo','table','Account_Type',null,null;end --添加新说明if exists ( select * from sysobjects where id = object_id(N'[Account_Type]') and objectproperty(id, N'IsUserTable') = 1 ) and not exists ( select isnull(B.name, '') as name , A.value from sys.extended_properties A left join sys.columns B on A.major_id = B.object_id and A.minor_id = B.column_id left join sys.tables C on A.major_id = C.object_id where A.class = 1 and C.name = 'Account_Type' and isnull(B.name, '') = '' ) begin execute sp_addextendedproperty N'MS_Description', N'账号类型表', N'user', N'dbo', N'table', N'Account_Type', null, null; end; go ---4) 添加字段说明sql语句：--------------------------[Account_Type].[Type_Id] 添加字段说明：类别Id--删除旧说明declare @name nvarchar(50)select @name=a.name from sys.extended_properties A left join sys.columns B on A.major_id = B.object_id and A.minor_id = B.column_id left join sys.tables C on A.major_id = C.object_id where A.class = 1 and C.name = 'Account_Type' and isnull(B.name, '') = 'Type_Id' print @name if(@name<>'') begin execute sp_dropextendedproperty @name,'user','dbo','table','Account_Type','column','Type_Id'; end --添加新说明if exists ( select top 1 1 from INFORMATION_SCHEMA.COLUMNS where [TABLE_NAME] = 'Account_Type' and [COLUMN_NAME] = 'Type_Id' ) and not exists ( select isnull(B.name, '') as name , A.value from sys.extended_properties A left join sys.columns B on A.major_id = B.object_id and A.minor_id = B.column_id left join sys.tables C on A.major_id = C.object_id where A.class = 1 and C.name = 'Account_Type' and isnull(B.name, '') = 'Type_Id' ) begin exec sp_addextendedproperty N'MS_Description', N'类别Id', N'user', N'dbo', N'table', N'Account_Type', N'column', N'Type_Id'; end; go