【mybatis】【配置文件+集成Spring】

简介

于Hibernate不同,mybatis集成Spring,也保留了自己的配置文件

myBatis的配置文件

1.用设置配置的属性
比如:延迟加载的配置项
2.用给非domain设置别名 (domain类的别名在Spring配置文件中设置)
比如:给第三方二级缓存配置别名

<configuration>
    <settings>
        <setting name="key" value="value"/>
    settings>

    
    <typeAliases>
        <typeAlias type="全名" alias="别名"/>
    typeAliases>



configuration>

Spring的配置文件

1.开头

<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:tx="http://www.springframework.org/schema/tx" 
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">

2.打开注解

    
    <context:annotation-config/>
    
    <aop:aspectj-autoproxy/>
    
    <context:component-scan base-package="com.lwf.mybatis.hallo"/>

3.配置连接池

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    bean>
    <context:property-placeholder location="classpath:db.properies"/>

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql:///jdbc
db.password=admin
db.username=root

4.配置sqlSessionFactory

• 注入连接池bean对象
• domain类的别名设置.(给的值是包名,则包内所有类都有别名)
• 映射文件地址
• 配置文件地址

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource"/>
        
        <property name="typeAliasesPackage" value="com.lwf.mybatis.hallo"/>
        
        <property name="mapperLocations" value="classpath:com/lwf/mybatis/hallo/*Mapper.xml"/>
        
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    bean>

5.事务管理

• 与Hibernate不同,myBatis用的是jdbc的事务管理

    
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>  
    bean>

    
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="list*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        tx:attributes>
    tx:advice>

    
    <aop:config>
        <aop:pointcut expression="execution(* com.lwf.mybatis.hallo..*Service.*(..))" id="pc"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pc"/>  
    aop:config>

6.注入mapper的bean.

• 方式1,直接手动注入.使用MapperFactoryBean,生成代理对象

id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="mapper接口全限名"/>

• 方式2,扫描方式注入

  
  <context:component-scan base-package="mapper接口所在的包"/>
  
  
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
      <property name="basePackage" value="com.lwf.mybatis.hallo"/>
  bean>