mybaits和spring整合后pojo扫描怎么配置

Posted 2023-03-18

参考技术A 这篇文章将介绍Spring整合Mybatis如何完成SqlSessionFactory的动态切换的。并且会简单的介绍下MyBatis整合Spring中的官方的相关代码。Spring整合MyBatis切换SqlSessionFactory有两种方法，第一、继承SqlSessionDaoSupport，重写获取SqlSessionFactory的方法。第二、继承SqlSessionTemplate重写getSqlSessionFactory、getConfiguration和SqlSessionInterceptor这个拦截器。其中最为关键还是继承SqlSessionTemplate并重写里面的方法。而Spring整合MyBatis也有两种方式，一种是配置MapperFactoryBean，另一种则是利用MapperScannerConfigurer进行扫描接口或包完成对象的自动创建。相对来说后者更方便些。MapperFactoryBean继承了SqlSessionDaoSupport也就是动态切换SqlSessionFactory的第一种方法，我们需要重写和实现SqlSessionDaoSupport方法，或者是继承MapperFactoryBean来重写覆盖相关方法。如果利用MapperScannerConfigurer的配置整合来切换SqlSessionFactory，那么我们就需要继承SqlSessionTemplate，重写上面提到的方法。在整合的配置中很多地方都是可以注入SqlSessionTemp

spring和mybaits整合

spring + mybatis + mysql/oracle开发

1. 创建一个spring-mybatis-mysql这么一个javaweb或java工程
2. 导入spring-ioc，spring-aop，spring-transaction，mybatis，c3p0，mysql/oracle相关的jar包和spring整合mybatis的jar包
3. 创建students.sql

--mysql
create table students(
   sid  int(5) primary key,
   sname varchar(10),
   ssal double(8,2)
);

4. 创建Student.java

/**
 * 学生
 * @author csx
 */
public class Student 
	private Integer id;//编号
	private String name;//姓名
	private Double sal;//薪水
	public Student()
	public Student(Integer id, String name, Double sal) 
		this.id = id;
		this.name = name;
		this.sal = sal;
	
	public Integer getId() 
		return id;
	
	public void setId(Integer id) 
		this.id = id;
	
	public String getName() 
		return name;
	
	public void setName(String name) 
		this.name = name;
	
	public Double getSal() 
		return sal;
	
	public void setSal(Double sal) 
		this.sal = sal;
	

5. 创建StudentMapper.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="studentNamespace">
	<resultMap type="cn.csx.javaee.mybatis.entity.Student" id="studentMap">
		<id property="id" column="sid" />
		<result property="name" column="sname"/>
		<result property="sal" column="ssal"/>
	</resultMap>
	<insert id="insert" parameterType="cn.csx.javaee.mybatis.entity.Student">
		insert into students(sid,sname,ssal) values(#id,#name,#sal)
	</insert>
</mapper>

6. 创建StudentDao.java

public class StudentDao 
	private SqlSessionFactory sqlSessionFactory;
	public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) 
		this.sqlSessionFactory = sqlSessionFactory;
	
	public void insert(Student student)
		SqlSession sqlSession = sqlSessionFactory.openSession();
		sqlSession.insert("studentNamespace.insert",student);
		//int i = 10/0;
	
	public static void main(String[] args) 
		ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]"spring.xml");
		StudentDao studentDao = (StudentDao) ac.getBean("studentDaoID");
		studentDao.insert(new Student(1,"哈哈",7000D));
	

7. 在src目录下创建mybatis.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>
	<mappers>
		<mapper resource="cn/csx/javaee/mybatis/entity/StudentMapper.xml"/>
	</mappers>
</configuration>

8. 在src目录下创建spring.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"
      xmlns:tx="http://www.springframework.org/schema/tx"
	  xmlns:mvc="http://www.springframework.org/schema/mvc"
		
      xsi:schemaLocation="
	
	  http://www.springframework.org/schema/beans 
	  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	  
	  http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd
 	  
	  http://www.springframework.org/schema/aop 
	  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
	  
	  http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        
      ">

      <!-- 配置C3P0连接池(即管理数据库连接) -->
      <bean id="comboPooledDataSourceID" class="com.mchange.v2.c3p0.ComboPooledDataSource">
      		<property name="driverClass" value="com.mysql.jdbc.Driver"/>
      		<property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/mybatis"/>
      		<property name="user" value="root"/>
      		<property name="password" value="root"/>
      </bean>
      
      
      <!-- 配置SqlSessionFactoryBean(即替代MyBatisUtil工具类的作用) -->
      <bean id="sqlSessionFactoryBeanID" class="org.mybatis.spring.SqlSessionFactoryBean">
      		<property name="dataSource" ref="comboPooledDataSourceID"/>
      		<property name="configLocation" value="classpath:mybatis.xml"/>
      </bean>
      
      
      <!-- 配置事务管理器(即使用JDBC事务管理器) -->
      <bean id="dataSourceTransactionManagerID" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
      		<property name="dataSource" ref="comboPooledDataSourceID"/>
      </bean>
      
      
      <!-- 配置事务通知(即哪些方法需要事务) -->
	  <tx:advice id="tx" transaction-manager="dataSourceTransactionManagerID">
	  		<tx:attributes>
	  			<tx:method name="*" propagation="REQUIRED"/>
	  		</tx:attributes>
	  </tx:advice>     

      
      <!-- 配置事务切面(即哪些包中的类需要事务通知) -->
      <aop:config>
      		<aop:pointcut id="pointcut" expression="execution(* cn.itcast.javaee.mybatis.dao.*.*(..))"/>
      		<aop:advisor advice-ref="tx" pointcut-ref="pointcut" />
      </aop:config>
      
      
      <!-- 配置StudentDao类 -->
      <bean id="studentDaoID" class="cn.itcast.javaee.mybatis.dao.StudentDao">
      		<property name="sqlSessionFactory" ref="sqlSessionFactoryBeanID"/>
      </bean>
      
</beans>