MyBaits和Spring的整合

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MyBaits和Spring的整合

整合环境搭建

准备所需JAR包
编写配置文件
db.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456
jdbc.maxTotal=30
jdbc.maxIdle=10
jdbc.initialSize=5

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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-4.3.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
    <!--读取db.properties -->
    
    <context:property-placeholder location="classpath:db.properties"/>
    
    <!-- 配置数据源 -->
	<bean id="dataSource" 
            class="org.apache.commons.dbcp2.BasicDataSource">
        <!--数据库驱动 -->
        <property name="driverClassName" value="${jdbc.driver}" />
        <!--连接数据库的url -->
        <property name="url" value="${jdbc.url}" />
        <!--连接数据库的用户名 -->
        <property name="username" value="${jdbc.username}" />
        <!--连接数据库的密码 -->
        <property name="password" value="${jdbc.password}" />
        <!--最大连接数 -->
        <property name="maxTotal" value="${jdbc.maxTotal}" />
        <!--最大空闲连接  -->
        <property name="maxIdle" value="${jdbc.maxIdle}" />
        <!--初始化连接数  -->
        <property name="initialSize" value="${jdbc.initialSize}" />
	</bean>
	<!-- 事务管理器，依赖于数据源 --> 
	<bean id="transactionManager" class=
     "org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>	
    <!--开启事务注解 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>
    <!--配置MyBatis工厂 -->
    <bean id="sqlSessionFactory" 
            class="org.mybatis.spring.SqlSessionFactoryBean">
         <!--注入数据源 -->
         <property name="dataSource" ref="dataSource" />
         <!--指定核心配置文件位置 -->
   		<property name="configLocation" value="classpath:mybatis-config.xml"/>
   </bean>
   
   <!--实例化Dao -->
	<bean id="customerDao" class="com.itheima.dao.impl.CustomerDaoImpl">
	<!-- 注入SqlSessionFactory对象实例-->
	     <property name="sqlSessionFactory" ref="sqlSessionFactory" />
	</bean>
	<!-- Mapper代理开发（基于MapperFactoryBean） -->
	<!-- <bean id="customerMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
	    <property name="mapperInterface" value="com.itheima.mapper.CustomerMapper" />
	    <property name="sqlSessionFactory" ref="sqlSessionFactory" />  
	</bean> -->
	<!-- Mapper代理开发（基于MapperScannerConfigurer） -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
	     <property name="basePackage" value="com.itheima.mapper" />
	</bean>
	
	<!-- 开启扫描 --> 
	<context:component-scan base-package="com.itheima.service" />
	
</beans>

mybatis-config.xml

<?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>
    <!--配置别名 -->
    <typeAliases>
        <package name="com.itheima.po" />
    </typeAliases>
    <!--配置Mapper的位置 -->
	<mappers> 
       <mapper resource="com/itheima/po/CustomerMapper.xml" />
       <!-- Mapper接口开发方式 -->
	   <mapper resource="com/itheima/mapper/CustomerMapper.xml" />
       
	</mappers>
</configuration>

log4j.properties

# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.com.itheima=DEBUG
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

传统DAO方式的开发整合

1.实现持久层
Customer.java

package com.itheima.po;

public class Customer {
	private Integer id;       // 主键id
	private String username; // 客户名称
	private String jobs;      // 职业
	private String phone;     // 电话
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getJobs() {
		return jobs;
	}
	public void setJobs(String jobs) {
		this.jobs = jobs;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	@Override
	public String toString() {
		return "Customer [id=" + id + ", username=" + username + 
				       ", jobs=" + jobs + ", phone=" + phone + "]";
	}
}

CustomerMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.po.CustomerMapper">
	<!--根据id查询客户信息 -->
	<select id="findCustomerById" parameterType="Integer"
		     resultType="customer">
		select * from t_customer where id = #{id}
	</select>
</mapper>

2、实现DAO层
Customer.java

package com.itheima.dao;
import com.itheima.po.Customer;
public interface CustomerDao {
	// 通过id查询客户
	public Customer findCustomerById(Integer id);
}

CustomerDaolmpl.java

package com.itheima.dao.impl;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import com.itheima.dao.CustomerDao;
import com.itheima.po.Customer;
public class CustomerDaoImpl 
                      extends SqlSessionDaoSupport implements CustomerDao {
	// 通过id查询客户
	public Customer findCustomerById(Integer id) {
         	return this.getSqlSession().selectOne("com.itheima.po"
				      + ".CustomerMapper.findCustomerById", id);
	}
}

3.整合测试
DaoTest.java

package com.itheima.test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.itheima.dao.CustomerDao;
import com.itheima.mapper.CustomerMapper;
import com.itheima.po.Customer;
/**
 * DAO测试类
 */
public class DaoTest {
	@Test
	public void findCustomerByIdDaoTest(){
		@SuppressWarnings("resource")
		ApplicationContext act = 
		    new ClassPathXmlApplicationContext("applicationContext.xml");
          // 根据容器中Bean的id来获取指定的Bean
	     CustomerDao customerDao = 
                              (CustomerDao) act.getBean("customerDao");
//	     CustomerDao customerDao = act.getBean(CustomerDao.class);
		 Customer customer = customerDao.findCustomerById(1);
		 System.out.println(customer);
	}
	
	@Test
	public void findCustomerByIdMapperTest(){	
	    @SuppressWarnings("resource")
		ApplicationContext act = 
	            new ClassPathXmlApplicationContext("applicationContext.xml");
	    CustomerMapper customerMapper = act.getBean(CustomerMapper.class);   
	    Customer customer = customerMapper.findCustomerById(1);
	    System.out.println(customer);
	}

}

Mapper接口方式的开发整合

1、基于MapperFactoryBean的整合
CustomerMapper.java

package com.itheima.mapper;
import com.itheima.po.Customer;
public interface CustomerMapper {
	// 通过id查询客户
	public Customer findCustomerById(Integer id);
	
	// 添加客户
	public void addCustomer(Customer customer);

}

CustomerMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.CustomerMapper">
	<!--根据id查询客户信息 -->
	<select id="findCustomerById" parameterType="Integer"
		     resultType="customer">
		select * from t_customer where id = #{id}
	</select>
	
	<!--添加客户信息 -->
	<insert id="addCustomer" parameterType="customer">
	    insert into t_customer(username,jobs,phone)
	    values(#{username},#{jobs},#{phone})
	</insert>
	
</mapper>

测试事务

CustomerService.java

package com.itheima.service;
import com.itheima.po.Customer;
public interface CustomerService {
    public void addCustomer(Customer customer);
}

CustomerServicelmpl.java

package com.itheima.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.itheima.mapper.CustomerMapper;
import com.itheima.po.Customer;
import com.itheima.service.CustomerService;
@Service
//@Transactional
public class CustomerServiceImpl implements CustomerService {
	//注解注入CustomerMapper
	@Autowired
	private CustomerMapper customerMapper;
	//添加客户
	public void addCustomer(Customer customer) {
		this.customerMapper.addCustomer(customer);
		@SuppressWarnings("unused")
		int i=1/0; //模拟添加操作后系统突然出现的异常问题
	}
}

TransactionTest.java

package com.itheima.test;
import org.springframework.context.ApplicationContext;
import 
     org.springframework.context.support.ClassPathXmlApplicationContext;
import com.itheima.po.Customer;
import com.itheima.service.CustomerService;
/**
 * 测试事务
 */
public class TransactionTest {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		ApplicationContext act = 
             new ClassPathXmlApplicationContext("applicationContext.xml");
		CustomerService customerService = 
                                            act.getBean(CustomerService.class);
		Customer customer = new Customer();
		customer.setUsername("郭佳峰");
		customer.setJobs("老董");
		customer.setPhone("1388888888");
		customerService.addCustomer(customer);
	}
}

结果截图

MyBaits和Spring的整合