请教如何怎么对数据表中字段的说明进行更新或添加?
如:
table1有3列:
id
name
class
现在要对表table1的每一列加上字段说明(不是新加一列,而仅仅是更新字段说明),有什么sql语句可以做?
如:
table1有3列:
id
name
class
现在要对表table1的每一列加上字段说明(不是新加一列,而仅仅是更新字段说明),有什么sql语句可以做?
create table test (id int, name varchar(20))
GO
exec sp_addextendedproperty 'caption','用户ID', 'user',dbo,'table',test,'column',id
create table 表(a1 varchar(10),a2 char(2))--为表添加描述信息
EXECUTE sp_addextendedproperty N'MS_Description', '人员信息表', N'user', N'dbo', N'table', N'表', NULL, NULL--为字段a1添加描述信息
EXECUTE sp_addextendedproperty N'MS_Description', '姓名', N'user', N'dbo', N'table', N'表', N'column', N'a1'--为字段a2添加描述信息
EXECUTE sp_addextendedproperty N'MS_Description', '性别', N'user', N'dbo', N'table', N'表', N'column', N'a2'--更新表中列a1的描述属性:
EXEC sp_updateextendedproperty 'MS_Description','字段1','user',dbo,'table','表','column',a1--删除表中列a1的描述属性:
EXEC sp_dropextendedproperty 'MS_Description','user',dbo,'table','表','column',a1--删除测试
drop table 表
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 parent_obj=a.id 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 sysproperties g on a.id=g.id and a.colid=g.smallid
left join sysproperties f on d.id=f.id and f.smallid=0
--where d.name='要查询的表' --如果只查询指定表,加上此条件
order by a.id,a.colorder