spring整合mybatis

3、整合Mybatis

1. 数据源配置
2. sqlSessionFactory
3. sqlSessionTemplate
4. mapper接口实现类
5. 实现类注入到spring中

3.1、依赖

<dependencies>

    <!--spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.6</version>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    
    <!-- mybatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.7</version>
    </dependency>
    
    <!--  mybatis-spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
    
    <!--spring-jdbc-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.8</version>
    </dependency>

    <!--单元测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.2</version>
    </dependency>

    <!--aop-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>
</dependencies>

3.2、回顾mybaits

• 实体类

• 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>
    
        <!--使用了Spring的dataSource,就注释掉这里-->
        <!-- 环境, 就是配置数据库访问环境的标签.default - 默认使用什么环境-->
        <environments default="development">
            &lt;!&ndash; 配置具体的某一个环境id - 当前环境的命名&ndash;&gt;
            <environment id="development">
                &lt;!&ndash; 事务管理方式, 当前框架管理数据库事务使用什么技术.type - 使用的具体技术. JDBC, 就是Connection.commit()/rollback()&ndash;&gt;
                <transactionManager type="JDBC"/>
                &lt;!&ndash; 数据源, 访问的数据库参数type - 管理方式, 管理Connection的方式,POOLED , 代表池化管理. 就是连接池.&ndash;&gt;
                <dataSource type="POOLED">
                    &lt;!&ndash; 配置具体参数 &ndash;&gt;
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://localhost:3306/db1?userSSL=true&amp;userUnicode=true&amp;characterEncoding=UTF-8"/>
                    <property name="username" value="root"/>
                    <property name="password" value="root"/>
                </dataSource>
            </environment>
        </environments>
    
        <typeAliases>
            <package name="com.moral.pojo"/>
        </typeAliases>
    
    </configuration>
    

• mapper接口

• *Mapper.xml

• 测试

3.3、配置文件

• applicationContext.xml（注册bean）

  • <?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">
               
        <import resource="classpath:spring-dao.xml"/>
    
        <bean id="userMapper" class="com.moral.mapper.UserMapperImpl">
            <property name="sqlSessionFactory" ref="sqlSession"/>
        </bean>
    </beans>
    

• spring-dao.xml（别名及seting设置）

  • <?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>
    
        <typeAliases>
            <package name="com.moral.pojo"/>
        </typeAliases>
        
        <mappers>
            <mapper class="com.moral.mapper.UserMapper"/>
        </mappers>
    
    </configuration>
    

• mybatis-config.xml（ 数据源）

  • <?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">
    
        <!--DataSource-->
        <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/db1?userSSL=true&amp;userUnicode=true&amp;characterEncoding=UTF-8"/>
            <property name="username" value="root"/>
            <property name="password" value="root"/>
        </bean>
    
        <!--sqlSessionFactory-->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            <!--绑定mybatis配置文件-->
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        </bean>
    
        <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
            <!--只能使用构造器注入sqlSessionFactory-->
            <constructor-arg index="0" ref="sqlSessionFactory"/>
        </bean>
    
    </beans>
    

3.4、整合mybatis

<?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">
    <import resource="classpath:spring-dao.xml"/>

    <!--方式1-->
    <bean id="userMapper" class="com.moral.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

    <!--方式2-->
    <bean id="userMapper2" class="com.moral.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

方式1

public class UserMapperImpl implements UserMapper {

    private SqlSessionTemplate sqlSession;

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

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

3.5、整合mybatis

方式2

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
    public List<User> selectUser() {
        return getSqlSession().getMapper(UserMapper.class).selectUser();
    }
}