1.获取所有数据库名:SELECT Name from Master..SysDatabases ORDER BY Name2.获取所有表名:SELECT Name from DatabaseName..SysObjects Where XType=‘U‘ ORDER BY NameXType=‘U‘:表示所有用户表;XType=‘S‘:表示所有系统表;3.获取所有字段名:SELECT Name from SysColumns WHERE id=Object_Id(‘TableName‘)access :如果表存在，如何得到这个表？SELECT * from MSysObjects where name=‘ExamResultTime ‘ and type=1 and flags=0//得到该数据库中所有的表名SELECT name from MSysObjects where type=1 and flags=0      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