背景
本文主要介紹spring+mybatis+PamirsTransaction的配置。即ORM映射框架和事務的配合使用
mybatis配置
mybatis主要完成java到db的映射。主要模塊有datasource、sqlSessionFactory、DAO及sqlmap四個部分組成。其中datasource爲數據源,目前一般用的都是mysql數據庫。sqlSessionFactory爲數據會話,該會話完成接口到sql的映射工作。DAO接口類,對於數據庫操作的抽象接口,上層調用可以直接調用該接口進行DB操作,sqlmap完成DAO到DB的映射配置文件。DAO接口類即通過sqlmap完成對DB的操作。
PamirsTransaction
事務管理,即在mybatis增加對於事務的處理。實際上任何框架本身是不支持事務的處理的,而事務的處理最終是依賴於DB。PamirsTransaction即協助管理了事務,使用PamirsTransaction即可完成對於事務的提交和回滾。
代碼
XML配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
">
<!--將原生數據源包裹一下,增加事務控制能力-->
<bean id="tbDataSource" class="com.taobao.pamirs.transaction.TBDataSourceImpl">
<property name="dataSource">
<ref bean="dataSource" />
</property>
</bean>
<!--數據源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="tbDataSource" />
<!-- 指定sqlMapConfig總配置文件,訂製的environment在spring容器中不在生效-->
<!--指定實體類映射文件,可以指定同時指定某一包以及子包下面的所有配置文件,mapperLocations和configLocation有一個即可,當需要爲實體類指定別名時,可指定configLocation屬性,再在mybatis總配置文件中採用mapper引入實體類映射文件 -->
<!--<property name="configLocation" value="classpath:fwportal/beans/dbconfig/mybatis.xml" />-->
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean>
<!--將DAO接口註冊爲BEAN-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="TRANSACTION.DAO" />
</bean>
<bean id="pamirsTransactionTemplate" class="com.taobao.pamirs.transaction.PamirsTransactionTemplate" />
<bean id="tbTransactionHandler" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref local="dataSource" />
</property>
</bean>
</beans>
DAO
package TRANSACTION.DAO;
import org.apache.ibatis.annotations.Delete;
/**
* Created by jianghuiwen on 17/5/5.
*/
public interface StudentDAO {
@Delete("delete from test where id = #{id}")
public void delete(Long id);
}
測試表
測試類
@Test
public void testDAOrollback() throws SQLException {
ApplicationContext context = new ClassPathXmlApplicationContext("mysqltransaction.xml");
final StudentDAO dao = (StudentDAO)context.getBean("studentDAO");
PamirsTransactionTemplate pamirsTransactionTemplate = (PamirsTransactionTemplate) context.getBean("pamirsTransactionTemplate");
Boolean isSuccess = (Boolean) pamirsTransactionTemplate.execute(new PamirsTransactionAction(){
public Object doInTransaction(PamirsTransactionStatus pamirsTransactionStatus) throws Exception {
dao.delete(1L);
//pamirsTransactionStatus.setRollbackOnly();//測試回滾
return true;
}
});
}