SSM——Spring+Mybatis整合（原始dao开发模式）

1. 项目搭建

2. 导入项目整合jar包

mybatis-spring-1.2.4.jar

commons-dbcp2-2.1.1.jar
commons-pool2-2.4.2.jar

3. 在applicationContex.xml配置数据源dataSource、配置SqlSessionFactory、配置SqlSessionTemplate（可省略）

<?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"
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">


<context:property-placeholder location="classpath:db.properties"/>


<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${jdbc.driverclassName}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>


<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
</bean>


<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg ref="sqlSessionFactory"></constructor-arg>
</bean>
</beans>

4.在类路径下配置db.properties数据库配置信息
jdbc.driverclassName = oracle.jdbc.driver.OracleDriver
jdbc.url = jdbc:oracle:thin:@localhost:1521:orcl
jdbc.username = scott
jdbc.password = tiger

5. 创建dao层实现IEmpDao接口、EmpDaoImpl接口实现类、EmpMapper.xml映射文件
//----------------------------------------IEmpDao接口--------------------------------------------------------------

public interface IEmpDao {
public Emp getEmpByEmpno(int empno);
}

//------------------------------EmpDaoImpl接口实现类:继承SqlSessionDaoSupport接口--------------------------------------------------------------

public class EmpDaoImpl extends SqlSessionDaoSupport implements IEmpDao {
@Override
public Emp getEmpByEmpno(int empno) {
SqlSession session = this.getSqlSession();
Emp emp = (Emp)session.selectOne("getEmpByEmpno", empno);
return emp;
}
}
//-------------------------------------EmpMapper.xml映射文件--------------------------------------------------------------

<?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="test">
<select id="getEmpByEmpno" parameterType="int" resultType="com.neuedu.model.Emp">
select * from emp where empno = #{empno}
</select>
</mapper>

6.在applicationContext.xml中管理dao层bean

<bean id="empDao" class="com.neuedu.dao.EmpDaoImpl">

<property name="sqlSessionTemplate" ref="sqlSessionTemplate"></property>
</bean>

7.在sqlMapConfig.xml中配置XXXMapper.xml映射文件
<mappers>
<mapper resource="com/neuedu/dao/EmpMapper.xml"/>
</mappers>

8.测试
public static void main(String[] args) {
BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");

IEmpDao dao = (IEmpDao)factory.getBean("empDao");

Emp emp = dao.getEmpByEmpno(7499);

System.out.println(emp);
}