1.获取所有数据库名:

SELECT Name FROM Master..SysDatabases ORDER BY Name

2.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;

3.获取所有字段名:

SELECT Name FROM SysColumns WHERE id=Object_Id('TableName')