Mybatis——Spring整合

Posted 2020-10-18 Wayfo

一、引入依赖

• Spring的相关jar包
• mybatis-3.4.1.jar
• mybatis-spring-1.3.0.jar
• mysql-connector-java-5.1.37-bin.jar
• c3p0-0.9.1.2.jar

二、配置applicationContext.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- Spring希望管理所有的业务逻辑组件，等。。。 -->
    <context:component-scan base-package="com.nchu.mybatis">
        <context:exclude-filter type="annotation"
                                expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 引入数据库的配置文件 -->
    <context:property-placeholder location="classpath:db.properties" />
    <!-- Spring用来控制业务逻辑。数据源、事务控制、aop -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${url}"></property>
        <property name="driverClass" value="${driver}"></property>
        <property name="user" value="${username}"></property>
        <property name="password" value="${password}"></property>
    </bean>
    <!-- spring事务管理 -->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 开启基于注解的事务 -->
    <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>

    <!--
    整合mybatis
        目的：1、spring管理所有组件。mapper的实现类。
                service==>Dao   @Autowired:自动注入mapper；
            2、spring用来管理事务，spring声明式事务
    -->
    <!--创建出SqlSessionFactory对象  -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- configLocation指定全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!--mapperLocations: 指定mapper文件的位置-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>

    <!--配置一个可以进行批量执行的sqlSession  -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactoryBean"></constructor-arg>
        <constructor-arg name="executorType" value="BATCH"></constructor-arg>
    </bean>

    <!-- 扫描所有的mapper接口的实现，让这些mapper能够自动注入；
    base-package：指定mapper接口的包名
     -->
    <mybatis-spring:scan base-package="com.nchu.mybatis.dao"/>
    <!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.atguigu.mybatis.dao"></property>
    </bean> -->

</beans>

三、mybatis-config.xml配置

<?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>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--  开启延时加载-->
        <setting name="lazyLoadingEnabled" value="true"></setting>
        <setting name="aggressiveLazyLoading" value="false"></setting>
    </settings>

</configuration>