Spring09_整合MyBatis

整合MyBatis需要用到mybatis-spring.jar包，整合后就不需要MyBatis核心配置文件了，MyBatis-Spring 需要以下版本，一定要注意版本不然会出现一些令人摸不着头脑的异常

MyBatis-Spring	MyBatis	Spring 框架
2.0	3.5+	5.0+
1.3	3.4+	3.2.2+

编写代码顺序

在pom.xml中添加依赖编写实体类User.java，编写对应的接口UserMapper.java，编写映射文件UserMapper.xml，编写Spring配置文件ApplicationContext.xml,编写实现类UserDao并且在Spring配置文件中创建Bena,最后测试

<dependencies>
        <!--Junit4-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!--MyBatis核心包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>

        <!--MySQL驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>

        <!--Spring相关-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.10.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.10.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
        <!--MyBatis整合包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

</dependencies>
    <!--资源过滤-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

实体类

public class User {
    private int id;
    private String name;
    private String pwd;
    //get、set和toString方法
}

接口

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

对应的映射文件

<?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.Mapper.UserMapper">
    <select id="findAll" resultType="com.pojo.User">
        select * from user;
    </select>
</mapper>

SQL映射文件

<?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.Mapper.UserMapper">
    <select id="findAll" resultType="com.pojo.User">
        select * from user;
    </select>
</mapper>

Spring配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">


    <!--配置数据源：数据源有非常多，可以使用第三方的，也可使使用Spring的-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!--创建SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--关联Mybatis-->
        <property name="configLocation" value="classpath:MyBatis_config.xml"/>
        <property name="mapperLocations" value="classpath:UserMapper.xml"/>
    </bean>

   <!--创建sqlSessionTemplate , 关联sqlSessionFactory-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--利用构造器注入-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <!--创建UserDao-->

    <bean id="userDao" class="com.Mapper.UserDao">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

</beans>

 UserDao编写完就可以在Spring配置文件里绑定

public class UserDao  implements UserMapper {
    //sqlSession不用创建了，Spring来管理
    private SqlSessionTemplate sqlSession;

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

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

测试

@Test
    public void  Test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        UserMapper mapper = (UserMapper) context.getBean("userDao");
        List<User> users = mapper.findAll();
        for (User user : users) {
            System.out.println(user);
        }
    }