查詢數據庫中的表名、屬性值及其數據類型

查詢數據庫結構信息：

 
表名　　=case when a.colorder=1 then d.name else '' end,
表說明   =case when a.colorder=1 then isnull(f.value,'') else '' end,
字段序號=a.colorder,
字段名   =a.name,
標識　　=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
主鍵　　=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,
類型　　=b.name,
佔用字節數=a.length,
長度　　=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
小數位數=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
容許空  =case when a.isnullable=1 then '√'else '' end,
默認值  =isnull(e.text,''),
字段說明=isnull(g.[value],'')

 

example:

 

1 SELECT
2 FROM syscolumns a
3 left join systypes b on a.xusertype=b.xusertype
4 inner join sysobjects d on a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties'
5 left join syscomments e on a.cdefault=e.id
6 left join sysproperties g on a.id=g.id and a.colid=g.smallid 
7 left join sysproperties f on d.id=f.id and f.smallid=0
8 --where d.name='要查詢的表'    --若是隻查詢指定表,加上此條件
9 order by a.id,a.colorder

View Code

 

SQL2000系統表的應用：

1. 獲取當前數據庫的全部表名稱

   select Name from sysobjects where xtype='u' and statu>=0

    

2. 獲取某一個表的全部字段

   select name from syscolumns where id = object_id('表名')

    

3. 查看與某個表相關的視圖、存儲過程、函數

   select a.* from sysobjects a,syscomments b where a.id =b.id and b.text like'%表名'

    

4. 查看當前數據庫中全部存儲過程

   select name as存儲過程名稱 from sysobjects where xtype = 'P'

    

5. 查詢用戶建立的全部數據庫

   select * from master..sysdatabases D where sid not in(select sid from master..syslogins where name='sa')

    

6. 查詢某一個表的字段和數據類型

   select column_name,data_type from information_schema.columns
    where table_name = '表名' 

    

7. 取得表字段的描述

   select name, 
    (select value from sysproperties where id = syscolumns.id and smallid=syscolumns.colid) as 描述
    from syscolumns where id=object_id('表名')

    

8. 全部表的全部字段的類型

   select   c.Name   as   TableName,b.name   as   ColName,a.name   as   Type,a.length  
   from   syscolumns   a,systypes   b,sysobjects  
   c   where   c.type= 'U '   and
   a.xtype=b.xtype   and   a.id=c.id