Spring 整合Mybatis dao原始方法

╰半夏微凉° 2021-12-15 07:13 254阅读 0赞

先看一下项目图,基本就理解了整合的内容

![1227818-20180706192417068-1834133012.png][]

这次主角不再是Mybats的配置文件SqlMapConfig.xml了,而是Spring的applicationContext.xml

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
        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-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">
    
        <context:property-placeholder location="classpath:db.properties" />
        
        
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
            destroy-method="close">
            <property name="driverClassName" value="${jdbc.driver}" />
            <property name="url" value="${jdbc.url}" />
            <property name="username" value="${jdbc.username}" />
            <property name="password" value="${jdbc.password}" />
        </bean>
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"></property>
            <property name="configLocation" value="classpath:SqlMapConfig.xml"></property>
            <property name="typeAliasesPackage" value="com.itheima.mybatis.pojo"></property>
        </bean>
        
        <bean id="userDao" class="com.itheima.mybatis.dao.UserDaoImpl">
            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
        </bean>
        
        <bean id="transactionManager"    
            class="org.springframework.jdbc.datasource.DataSourceTransactionManager">    
            <property name="dataSource" ref="dataSource" />    
        </bean>  
        <tx:annotation-driven transaction-manager="transactionManager"/>
    </beans>

Spring同样开始整合数据源datasource

IoC控制反转生成sqlSessionFactory对象,注意有一个属性configLocation,用来关联Mybatis的映射文件SqlMapConfig.xml,

也是在该对象中对包进行别名操作

IoC控制反转生成要调用的对象userDao,其实现类继承SqlSessionDaoSupport,还要注入属性sqlSessionFactory

Mybatis配置文件SqlMapConfig.xml代码:

<?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>
        
        <mappers>
            <mapper resource="sqlmap/UserMapper.xml" />
        </mappers>
    </configuration>

映射文件UserMapper.xml

<!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    
    <mapper namespace="test">
        
        <select id="queryUserById" parameterType="Integer" resultType="user">
            
            select * from user where uid=#{uid}
        </select>
    </mapper>

接口

package com.itheima.mybatis.dao;
    
    import com.itheima.mybatis.pojo.User;
    
    public interface UserDao {
        User queryUserById(int id);
    }

实体类

package com.itheima.mybatis.dao;
    
    import org.mybatis.spring.support.SqlSessionDaoSupport;
    
    import com.itheima.mybatis.pojo.User;
    
    public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {
    
        public User queryUserById(int id) {
            // TODO Auto-generated method stub
            // 不需要关闭session，因为父类当中完成拦截关闭动作
            User user = super.getSqlSession().selectOne("test.queryUserById", id);
            return user;
        }
    
    }

测试类

package com.itheima.mybatis.test;
    
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.itheima.mybatis.dao.UserDao;
    import com.itheima.mybatis.pojo.User;
    
    public class TestUserDao {
        private ApplicationContext ctx;
        
        @Test
        @Transactional
        public void testQueryUserById() {
            ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
            UserDao userDao = ctx.getBean(UserDao.class);
            User user = userDao.queryUserById(3);
            System.out.println(user);
        }
    }

转载于:https://www.cnblogs.com/qingyundian/p/9275302.html

[1227818-20180706192417068-1834133012.png]: /images/20211214/e06f6bb0c8a149cfad82955d868c768c.png