1、获取所有用户名:

Select name FROM Sysusers where status='2' and islogin='1'

islogin='1'   :表示帐户

islogin='0'   :表示角色

status='2'   :表示用户帐户

status='0'   :表示糸统帐户  

2、获取所有数据库名:

Select Name FROM Master..SysDatabases orDER BY Name  

3、获取所有表名:

Select Name FROM DatabaseName..SysObjects Where XType='U' orDER BY Name

XType='U'    :表示所有用户表;

XType='S'    :表示所有系统表;  

4、获取所有字段名:

Select Name FROM SysColumns Where id=Object_Id('表名'')  

5、获取数据库所有类型:

select name from systypes  

6、获取主键字段:

Select  name FROM SysColumns Where id=Object_Id('表名') and colid=(select top 1 keyno from sysindexkeys where id=Object_Id('表名'))  

7、获取表字段的基本信息:

 程序代码

Select

  字段名=rtrim(b.name),

  主键=CASE WHEN h.id IS NOT NULL  THEN 'PK' ELSE '' END,

  字段类型=type_name(b.xusertype)+CASE WHEN b.colstat&1=1 THEN '[ID(' + CONVERT(varchar, ident_seed(a.name))+','+CONVERT(varchar,ident_incr(a.name))+')]' ELSE '' END,

  长度=b.length,

  允许空=CASE b.isnullable WHEN 0 THEN 'N' ELSE 'Y' END,

  默认值=isnull(e.text, ''),

  字段说明=isnull(c.value, '')

FROM sysobjects a, syscolumns b

LEFT OUTER JOIN sysproperties c ON b.id = c.id AND b.colid = c.smallid

LEFT OUTER JOIN syscomments e ON b.cdefault = e.id

LEFT OUTER JOIN (Select g.id, g.colid FROM sysindexes f, sysindexkeys g Where (f.id=g.id)AND(f.indid=g.indid)AND(f.indid>0)AND(f.indid<255)AND(f.status&2048)<>0) h ON (b.id=h.id)AND(b.colid=h.colid)

Where (a.id=b.id)AND(a.id=object_id('要查询的表'))  --要查询的表改成你要查询表的名称

orDER BY b.colid  

 程序代码

Select

  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 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,

  字段长度=a.length,

  占用字节数=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