Mybatis使用映射配置文件的CRUD操作
1.实体类
public class User implements Serializable {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
2.dao接口
public interface IUserDao {
List<User> findAll();
void saveUser(User user);
void updateUser(User user);
void deleteUser(Integer userId);
3.主配置文件
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--mybatis的主配置文件-->
<configuration>
<!--配置环境-->
<environments default="mysql">
<!--配置mysql的环境-->
<environment id="mysql">
<!--配置事务的类型-->
<transactionManager type="JDBC"></transactionManager>
<!--配置数据源(连接池)-->
<dataSource type="POOLED">
<!--配置数据库的四个基本信息-->
<property name="driver" value="com.mysql.cj.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/eesy?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false" />
<property name="username" value="root" />
<property name="password" value="123456" />
</dataSource>
</environment>
</environments>
<!--指定映射配置文件的位置,映射配置文件指的是每个dao独立的配置文件-->
<mappers>
<mapper resource="com/itheima/dao/IUserDao.xml"/>
</mappers>
</configuration>
4.映射配置文件
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.dao.IUserDao">
<!--配置查询所有-->
<!-- resultType:返回值要封装的全限定类名
parameterType:传递自定义参数时,写入参数的全限定类名
传递基本类型时,写入java.lang.Integer/INT/Integer都可以
-->
<select id="findAll" resultType="com.itheima.domain.User">
select * from user;
</select>
<!--保存用户-->
<insert id="saveUser" parameterType="com.itheima.domain.User">
<!-- 配置插入操作后,获取插入数据的自增id值 -->
<selectKey keyProperty="id" keyColumn="id" resultType="int" order="AFTER">
select last_insert_id();
</selectKey>
insert into user (username,address,sex,birthday) values (#{username},#{address},#{sex},#{birthday});
</insert>
<!--更新用户-->
<update id="updateUser" parameterType="com.itheima.domain.User">
update user set username = #{username},address = #{address},sex = #{sex},birthday = #{birthday} where id = #{id};
</update>
<!--删除用户-->
<delete id="deleteUser" parameterType="java.lang.Integer">
delete from user where id = #{uid}
</delete>
<!--根据id查找一个用户的信息-->
<select id="findById" parameterType="INT" resultType="com.itheima.domain.User">
select * from user where id = #{userid}
</select>
<!--根据名称模糊查询