//取得数据库表名
select name from sysobjects where xtype='u' order by name
//取得数据库表的字段
select c.* from syscolumns c, sysobjects o
where c.id = o.id and o.type = 'U' and o.name = 'tableName'
//修改数据库字段名
EXEC sp_rename 'tablename.oldcolumnname', 'newcolumnname'
//新增数据库字段
ALTER TABLE tablename ADD newcomlum int NULL
//删除数据库字段
ALTER TABLE tablename DROP COLUMN newcomlum