MySQL修改表结构及其添加删除修改字段功能

CREATE DATABASE database_name

CREATE TABLE `user` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT 'ID', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `user`;

"ALTER TABLE `user` ADD `id` int(11) NOT NULL DEFAULT '0' COMMENT 'ID'" ALTER TABLE `user` ADD `name` VARCHAR( 20 ) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '姓名'

ALTER TABLE `user` DROP column name

ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;

alter table t1 change b b bigint not null; alter table infos change list list tinyint not null default '0';

alter table t1 rename t2; mysql> alter table tablename change depno depno int(5) not null; mysql> alter table tablename add index 索引名 (字段名1[，字段名2 …]); mysql> alter table tablename add index emp_name (name);加主关键字的索引 mysql> alter table tablename add primary key(id);加唯一限制条件的索引 mysql> alter table tablename add unique emp_name2(cardnumber);删除某个索引 mysql>alter table tablename drop index emp_name;修改表：

M('admin')->execute("ALTER TABLE `admin` ADD `id` int(11) NOT NULL DEFAULT '0' COMMENT 'ID'"); M('admin')->execute("ALTER TABLE `admin` ADD `name` varchar(20) DEFAULT NULL COMMENT '姓名'");