JavaEE Spring與MyBatis的整合之傳統DAO方式整合(教材學習筆記)
阿新 • • 發佈:2018-12-03
在實際開發中MyBatis都是與Spring整合在一起使用的,在之前學習了MyBatis與Spring,現在來學習如何使他們整合
首先建立一個名為chapter10的web專案
一、環境搭建
1.準備好所有的有關jar包,具體如下:
將上面所有jar包新增到專案lib目錄下,併發布到類路徑下
2.編寫配置檔案
在src目錄下建立db.properties檔案,Spring配置檔案以及MyBatis的配置檔案,三個檔案分別如下所示:
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis jdbc.username=root jdbc.password=itcast jdbc.maxTotal=30 jdbc.maxIdle=10 jdbc.initialSize=5
<?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"> <!-- 讀取dp.properties --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置資料來源 --> <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"> <!-- 資料庫驅動 --> <property name="driverClassName" value="${jdbc.driver}" /> <!-- 連線資料庫的url --> <property name="url" value="${jdbc.url}" /> <!-- 連線資料庫的使用者名稱 --> <property name="username" value="${jdbc.username}" /> <!-- 連線資料庫的使用者密碼 --> <property name="password" value="${jdbc.password}" /> <!-- 最大連線數--> <property name="maxTotal" value="${jdbc.maxTotal}" /> <!-- 最大空閒連線數 --> <property name="maxIdle" value="${jdbc.maxIdle}" /> <!-- 初始化連線數 --> <property name="initialSize" value="${jdbc.initialSize}" /> </bean> <!-- 事務管理器,依賴於資料來源 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 開啟事務註解 --> <tx:annotation-driven transaction-manager="transactionManager"/> <!-- 配置MyBatis工廠 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 注入資料來源 --> <property name="dataSource" ref="dataSource"></property> <!-- 指定核心配置檔案位置 --> <property name="configLocation" value="classpath:mybatis-config.xml"></property> </bean> <bean id="CustomerDao" class="com.itheima.dao.impl.CustomerDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> </beans>
<?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> <properties resource="db.properties"/> <typeAliases> <package name="com.itheima.po"/> </typeAliases> <mappers> </mappers> </configuration>
3.此外還需要建立log4j.properties檔案
# 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
二、基於傳統的DAO方式開發整合
1.在src目錄下建立com.itheima.po包,並在包中建立持久化類Customer
package com.itheima.po;
public class Customer {
private Integer id;
private String username;
private String jobs;
private String phone;
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+"]";
}
}
2.在com.itheima.po包中,建立對映檔案CustomerMapper.xml在該檔案下編寫根據id查詢的對映語句
<?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">
<select id="findCustomerById" parameterType="Integer" resultType="Customer">
select * from t_customer where id=#{id}
</select>
</mapper>
3.在mybatis的配置檔案mybatis-config.xml中,配置對映檔案Customer.xml的位置,具體如下:
<mapper resource="com/itheima/po/CustomerMapper.xml"/>
4.在src目錄下建立一個com.itheima.dao包,並在包中建立介面CustomerDao,在介面中編寫一個通過id查詢客戶的方法findCustomerById()
package com.itheima.dao;
import com.itheima.po.Customer;
public interface CustomerDao {
public Customer findCustomerById(Integer id);
}
5.在src目錄下建立一個com.itheima.dao.impl包,並在包中建立介面CustomerDao的實現類
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 {
@Override
public Customer findCustomerById(Integer id) {
return this.getSqlSession().selectOne("com.itheima.po.CustomerMapper.findCustomerById",id);
}
}
6.在spring的配置檔案中,編寫例項化CustomerDaoImpl的配置,並將SqlSessionFactory物件注入之中
<bean id="CustomerDao" class="com.itheima.dao.impl.CustomerDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
7、整合測試,在src目錄下建立com.itheima.test包,並在包中建立測試類DaoTest類,在類中編寫測試方法findCustomerByIdDaoTest()
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.po.Customer;
public class DaoTest {
@Test
public void findCustomerByIdTest() {
ApplicationContext act= new ClassPathXmlApplicationContext("applicationContext.xml");
CustomerDao customerDao = act.getBean(CustomerDao.class);
Customer customer = customerDao.findCustomerById(1);
System.out.println(customer);
}
}
8.測試結果如下:
和資料庫進行對比