Spring整合Mybatis

Spring整合Mybatis

概述

本文主要讲解Spring整合Mybatis, 主要思想是把MyabatisUtl类给取代了，全部由Spring创建bean，包括sqlSessionFactroy, sqlSessin，Mybatis配置类也被取代了，由dataSource bean取代，最后创建了一个UserMapperImpl的bean

实践

数据库

create table `user` (
`id` int(20) not null ,
`name` varchar(30) default null,
`pwd` varchar(30) default  null
)engine=innodb default charset=utf8;

insert into `user`(`id`,`name`,`pwd`) values
(1,'狂神','123456'),
(2,'张三','111'),
(3,'李四','222');

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>Spring-study</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>SpringStudy02-mybatisSping</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
        <!--  mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.9</version>
        </dependency>
        <!--  mysql driver-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
    </dependencies>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

</project>

User.java

package com.kuang.pojo;

import lombok.Data;

@Data
public class User {
    private int id;
    private String name;
    private String pwd;
}

UserMapper.java

package com.kuang.dao;

import com.kuang.pojo.User;

import java.util.List;

public interface UserMapper {
    List<User> getUsers();
}

UserMapperImol.java

package com.kuang.dao;

import com.kuang.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper{
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> getUsers() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.getUsers();
    }
}

UserMapper.xml

<?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.kuang.dao.UserMapper">
    <select id="getUsers" resultType="com.kuang.pojo.User">
        select *
        from user
    </select>
</mapper>

application-source.xml

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/public?serverTimezone=UTC&amp;useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF8"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <property name="mapperLocations" value="classpath:com/kuang/dao/UserMapper.xml"></property>
    </bean>

    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>

    <bean id="userMapper" class="com.kuang.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"></property>
    </bean>
</beans>

Mybatis-config.xml

<?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">
<configuration>
</configuration>

Mytest.java

import com.kuang.dao.UserMapper;
import com.kuang.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class MyTest {
    public static void main(String[] args) throws IOException {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("application-source.xml");
        UserMapper mapper = applicationContext.getBean("userMapper", UserMapper.class);
        for (User user : mapper.getUsers()) {
            System.out.println(user);
        }
    }
}

运行结果

User(id=1, name=狂神, pwd=123456)
User(id=2, name=张三, pwd=111)
User(id=3, name=李四, pwd=222)