Java SSM框架之MyBatis3（八）MyBatis之动态SQL

/*Table structure for table `user` */

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL,
  `username` varchar(20) NOT NULL,
  `age` int(3) NOT NULL,
  `phone` varchar(11) NOT NULL,
  `email` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*Data for the table `user` */

insert  into `user`(`id`,`name`,`username`,`age`,`phone`,`email`) values (1,‘张三‘,‘zs‘,18,‘15010998046‘,‘4567899@qq.com‘),(2,‘李四‘,‘ls‘,19,‘15019087600‘,‘567657642@qq.com‘),(3,‘王五‘,‘ww‘,20,‘15010898065‘,‘2323248@qq.com‘);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

<select id="getUser" resultType="cn.cnki.ref.pojo.User">
        select * from user
        <where>
            <if test="id != null">and id=#{id} </if>
            <if test="age != null">and age=#{age} </if>
            <if test="name != null">and name=#{name}</if>
        </where>
    </select>