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  • Spring整合MyBatis

    整合步骤

    一、导入相关jar包

    (1)junit

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>

        

    (2) mybatis

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>

        

    (3)mysql-connector-java

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.19</version>
    </dependency>

        

    (4)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>

    (5)AspectJ AOP 织入器

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>

    (6)mybatis-spring整合包 【重点】

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>

    (7)配置Maven静态资源过滤问题!

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

    二、编写配置文件,代码实现

    回忆MyBatis

    1、创建实体类

    package com.jia.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class User {
        private Integer id;         //编号
        private String username;    //用户名
        private String password;    //密码
    }

    实现mybatis全局配置文件(也是核心配置文件)

    <?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">
    <configuration>
    
        <!--配置别名-->
        <typeAliases>
            <package name="com.jia.pojo"/>
        </typeAliases>
    
        <environments default="development">
            <environment id="development">
                <transactionManager type="JDBC"/>
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.cj.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="123456"/>
                </dataSource>
            </environment>
        </environments>
    
        <!--注册SQL映射文件-->
        <mappers>
            <mapper class="com.jia.mapper.UserMapper"/>
        </mappers>
    </configuration>

    UserMapper接口编写

    package com.jia.mapper;
    
    
    import com.jia.pojo.User;
    
    import java.util.List;
    
    public interface UserMapper {
    
        /**
         * 查询所有用户
         * @return
         */
        public List<User> selectUser();
    
        /**
         * 根据id查询用户
         * @param id
         * @return
         */
        public User selectUserById(Integer id);
        
    }

    接口对应的Mapper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">
    
    <!--绑定接口-->
    <mapper namespace="com.jia.mapper.UserMapper">
    
        <select id="selectUser" resultType="User">
            SELECT * FROM User
        </select>
    
        <select id="selectUserById" resultType="User" parameterType="int">
            SELECT * FROM User WHERE id=#{id}
        </select>
    </mapper>

    测试类

    import com.jia.mapper.UserMapper;
    import com.jia.pojo.User;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    
    public class MyTestMybatis {
    @Test
    //查询所有用户 public void selectUser() throws IOException { String resource = "mybatis-config.xml"; InputStream input = Resources.getResourceAsStream(resource); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(input); SqlSession sqlSession = sessionFactory.openSession(true); //ture:自动提交事务 UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<User> userList = mapper.selectUser(); for (User user : userList) { System.out.println(user); } //释放资源 sqlSession.close(); }
    @Test
    //根据id查询用户 public void selectUserById() throws IOException { String resource = "mybatis-config.xml"; InputStream input = Resources.getResourceAsStream(resource); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(input); SqlSession sqlSession = sessionFactory.openSession(true); UserMapper mapper = sqlSession.getMapper(UserMapper.class); User user = mapper.selectUserById(2); System.out.println(user); sqlSession.close(); } }

    MyBatis-Spring学习

        引入Spring之前需要了解mybatis-spring包中的一些重要类

        官方文档:http://www.mybatis.org/spring/zh/index.html

    什么是 MyBatis-Spring?

        MyBatis-Spring 会帮助你将 MyBatis 代码无缝地整合到 Spring 中

     知识基础

        在开始使用 MyBatis-Spring 之前,你需要先熟悉 Spring 和 MyBatis 这两个框架和有关它们的术语。这很重要

    MyBatis-Spring 需要以下版本:

    QQ截图20191021223404.jpg

        如果使用 Maven 作为构建工具,仅需要在 pom.xml 中加入以下代码即可:

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>

    整合实现

    1、引入Spring配置文件beans.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <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
            http://www.springframework.org/schema/beans/spring-beans.xsd">

    2、配置数据源替换mybaits的数据源

    <!--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.cj.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="123456"/> </bean>

    3、配置SqlSessionFactory,关联MyBatis

    <!--配置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:com/kuang/dao/*.xml"/>
    </bean>

    4.注册sqlSessionTemplate,关联sqlSessionFactory;

    <!--注册sqlSessionTemplate , 关联sqlSessionFactory-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--利用构造器注入,源码里没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    5、增加Dao接口的实现类,私有化sqlSessionTemplate

    package com.jia.mapper;
    
    import com.jia.pojo.User;
    import org.mybatis.spring.SqlSessionTemplate;
    import java.util.List;
    
    public class UserMapperImpl implements UserMapper{
    
        //sqlSession不用我们自己创建了,Spring来管理
        private SqlSessionTemplate sqlSession;
    
        public void setSqlSession(SqlSessionTemplate sqlSession) {
            this.sqlSession = sqlSession;
        }
    
        public List<User> selectUser() {
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            return mapper.selectUser();
        }
    
        public User selectUserById(Integer id) {
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            return mapper.selectUserById(2);
        }
    }

    6、注册bean实现

        <!--注册UserMapperImpl-->
        <bean id="userMapper" class="com.jia.mapper.UserMapperImpl">
            <property name="sqlSession" ref="sqlSession"/>
        </bean>

    7、测试

    import com.jia.mapper.UserMapper;
    import com.jia.pojo.User;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import java.io.IOException;
    
    public class MyTestMybatis {
    
        @Test
        //查询所有用户
        public void selectUser() throws IOException {
            ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
            UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
            for (User user : userMapper.selectUser()) {
                System.out.println(user);
            }
        }
    
        @Test
        //根据id查询用户
        public void selectUserById() throws IOException {
            ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
            UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
            User userById = userMapper.selectUserById(1);
            System.out.println(userById);
        }
    }

    结果成功输出!现在我们的Mybatis配置文件的状态!发现都可以被Spring整合!

    <?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>
    
        <!--配置别名-->
        <typeAliases>
            <package name="com.jia.pojo"/>
        </typeAliases>
    
    </configuration>
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  • 原文地址:https://www.cnblogs.com/luckyjcx/p/12273332.html
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