查找表名与所有字段名

表名：

   mysql:      

SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='schemaName' and TABLE_NAME = 'tablename';

   oracle:

select TABLE_NAME from tabs where TABLE_NAME = 'tableName'

   SqlServer:

use t3d 
select * from sysobjects where xtype='u' and status>=0

字段名:

  mysql:  

select * from information_schema.columns where table_schema='schema' and table_name='tableName'

  oracle:

select * from user_tab_columns where table_name='tableName'

   SqlServer:

use dbname 
select name from syscolumns where id=object_id(N'tableName') order by colid