整合mybatis-DAO

这次jar包较多

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.huangxin</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!--log记录-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!--MySQL驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <!-- mybatis.jar -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- junit.jar -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--spring框架导入-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.17.RELEASE</version>
        </dependency>
        <!--spring-test-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.17.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <!--AspectJ  AOP环境-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.17.RELEASE</version>
        </dependency>
        <!--druid连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.12</version>
        </dependency>
        <!--spring和mybatis整合包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!--spring-jdbc依赖包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.17.RELEASE</version>
        </dependency>
    </dependencies>
</project>

这时候直接使用druid连接池,并且交给spring管理
配置spring-config.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: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">
    <!--扫描注解-->
    <context:component-scan base-package="com.huangxin.order"></context:component-scan>
    <!--AOP注解生效-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    <!--加载配置文件-->
    <context:property-placeholder location="property/jdbc.properties"></context:property-placeholder>
    <!--druid连接池-->
    <bean id="dateSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!--SqlSessionFactory工厂交给spring-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--将数据源注入SqlSessionFactory-->
        <property name="dataSource" ref="dateSource"></property>
        <!--引入映射-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>
    <!--sqlSession交给spring管理-->
    <!--使用多例,因为有多个会话-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate" scope="prototype">
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>
</beans>

因为在以上配置中已经将对象映射文件引入,所以已经不再使用mybatis-config.xml文件,可以将其删除

使用DAO方式实现映射

package com.huangxin.order.mapper.impl;
import com.huangxin.order.mapper.OrderMapper;
import com.huangxin.order.model.Orders;
import org.apache.ibatis.session.SqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.List;
@Component//将其注册为bean
public class OrderMapperImpl implements OrderMapper {
    @Autowired//为其注入
    private SqlSession sqlSession;
    public Orders getById(Integer id) {
        Orders orders = sqlSession.selectOne("com.huangxin.order.mapper.OrderMapper.getById", id);
        //spring已经管理,不能调用
        //        sqlSession.close();
        return orders;
    }
}

这是对OrderMapper文件的实现,使用注解方式给对象注入

在Junit中直接调用即可

package com.huangxin.order.mapper.impl;
import com.huangxin.order.mapper.OrderMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import static org.junit.Assert.*;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring-config.xml")//读取配置文件
public class OrderMapperImplTest {
    @Autowired
    private OrderMapper orderMapper;
    @Test
    public void getById() {
        System.out.println(orderMapper.getById(1));
    }
}

这是整合以后,以后开发方式改变

特点

spring已经管理整个SqlSession会话,以及工厂,并且自动提交事务,自动关闭会话,以后只需要写逻辑代码