笔记32 SQL2005 查询表结构
1 --SQL2005 查询表结构
2 SELECT
3 (case when a.colorder=1 then d.name else '' end) as 表名,--如果表名相同就返回空 syscolumns(表字段信息表) a sysobjects d
4 a.colorder as 字段序号,
5 a.name as 字段名,
6 (case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity' )=1 then '√' else '' end) as 标识, --返回IsIdentity的值，IsIdentity只有两个值：0、1
7 (case when (SELECT count(*) FROM sysobjects--查询主键
8 WHERE (name in
9 (SELECT name FROM sysindexes
10 WHERE (id = a.id) AND (indid in
11 (SELECT indid FROM sysindexkeys
12 WHERE (id = a.id) AND (colid in
13 (SELECT colid FROM syscolumns
14 WHERE (id = a.id) AND (name = a.name))
15 )))))
16 AND (xtype = 'PK' ))>0 then '√' else '' end) as 主键,--查询主键END
17 b.name as 类型, --systypes b
18 a.length as 占用字节数,
19 COLUMNPROPERTY(a.id,a.name,'PRECISION' ) as 长度,
20 isnull(COLUMNPROPERTY(a.id,a.name,'Scale' ),0) as 小数位数,
21 (case when a.isnullable=1 then '√' else '' end) as 允许空,
22 isnull(e.text,'' ) as 默认值, --syscomments e
23 isnull(g.[value],'' ) AS 字段说明 --sys.extended_properties g (字段信息表)
24 FROM syscolumns a left join systypes b
25 on a.xtype=b.xusertype
26 inner join sysobjects d
27 on a.id=d.id and d.xtype='U' and d.name<> 'dtproperties'
28 left join syscomments e
29 on a.cdefault=e.id
30 left join sys.extended_properties g
31 on a.id=g.major_id AND a.colid = g.minor_id
32 where d.name='systempara' --所要查询的表
33 order by a.id,a.colorder
34
35 /*
36 select * from sys.extended_properties--字段信息表
37 select * from syscolumns--表字段信息表
38 select * from sysobjects where sysobjects.type='u' --数据库所有的用户创建的表的信息
39 select * from sysobjects where sysobjects.type='s' --数据库所有的系统表的信息
40 select * from syscomments --所有的触发器的东西
41 --COLUMNPROPERTY 返回有关列或过程参数的信息
42 */
