对于有些数据库我们没有权限或者因为其它原因无法查看其数据库的表结构,那么我们将要自己想办法去做了,如果能够应用程序访问的话,我们就可以使用如下所示的
sql脚本来获取数据库中的所有表结构了,代码如下:
use AdventureWorks2008
go
SELECT
(case when a.colorder=1 then d.name else '' end) 表名,
a.colorder 字段序号,
a.name 字段名,
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
(case when (SELECT count(*)
FROM sysobjects
WHERE (name in (SELECT name
FROM sysindexes
WHERE (id = a.id) AND (indid in (SELECT indid
FROM sysindexkeys
WHERE (id = a.id) AND (colid in (SELECT colid
FROM syscolumns
WHERE (id = a.id) AND (name = a.name)
)
)
)
)
)
) AND (xtype = 'PK')
) > 0 then '√' else '' end) 主键,
b.name 类型,
a.length 占用字节数,
COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
(case when a.isnullable=1 then '√'else '' end) 允许空,
isnull(e.text,'') 默认值,
isnull(g.[value],'') AS 字段说明 FROM syscolumns a
left join systypes b on a.xtype=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
--where d.name in ('Contact','StockBmps','AddressType')---查询具体的表,注释掉后就是查询整个数据库了
order by a.id,a.colorder
如果数据库的版本不是SQL Server2008呢,比如是SQL Server2000 呢?
那么就需要将sys.extended_properties用sysproperties代替了。
因为sysproperties这个系统表,但在2008版本中却提示找不到,在联机文档中也找不到,后来发现这个系统表在2005版本中就已经被系统表sys.extended_properties所代替。
查看表T的扩展信息:
select object_id from sys.sysobjects where name = 'T';
select * from sys.extended_properties where major_id = object_id;
扩展信息中有一name项是MS_Description,这个选项可以查看备注信息
select * from sys.extended_properties where major_id = object_id where name = 'MS_Description';