字段注释 表注释

`--为字段添加注释
--Eg. execute sp_addextendedproperty 'MS_Description','字段备注信息','user','dbo','table','字段所属的表名','column','添加注释的字段名';
execute sp_addextendedproperty 'MS_Description','add by liyc. 诊断类别码','user','dbo','table','DiagRecord','column','DiagTypeCode';

--修改字段注释
execute sp_updateextendedproperty 'MS_Description','add by liyc.','user','dbo','table','DiagRecord','column','DiagTypeCode';

--删除字段注释
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','DiagRecord','column','DiagTypeCode';

-- 添加表注释
execute sp_addextendedproperty 'MS_Description','诊断记录文件','user','dbo','table','DiagRecord',null,null;

-- 修改表注释
execute sp_updateextendedproperty 'MS_Description','诊断记录文件1','user','dbo','table','DiagRecord',null,null;

-- 删除表注释
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','DiagRecord',null,null;

--获取字段注释
SELECT objtype, objname, name, value
FROM fn_listextendedproperty ('MS_Description', 'user', 'dbo', 'table', 'base_Car', 'column', default)
--获取表注释
SELECT objtype, objname, name, value
FROM fn_listextendedproperty ('MS_Description', 'user', 'dbo', 'table', 'base_Car', NULL, NULL);
`