aop(关于事物 的一点点注解)
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cn.itcast.bean
- package cn.itcast.bean;
- public class Person {
- private Integer id;
- private String name;
- 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 Person()
- {}
- public Person (String name)
- {
- this.name=name;
- }
- }
cn.itcast.service
- package cn.itcast.service;
- import java.util.List;
- import cn.itcast.bean.Person;
- public interface PersonService {
- public void save(Person person);
- public void update(Person person);
- public Person getPerson(Integer personid);
- public List<Person>getPerson();
- public void delete(Integer personid);
- }
cn.itcast.service.impl
- package cn.itcast.service.impl;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import org.springframework.jdbc.core.RowMapper;
- import cn.itcast.bean.Person;
- public class PersonRowMapper implements RowMapper {
- public Object mapRow(ResultSet rs, int index) throws SQLException {
- Person person=new Person(rs.getString("name"));
- person.setId(rs.getInt("id"));
- return person;
- }
- }
package cn.itcast.service.impl;import java.util.List;import javax.sql.DataSource;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.transaction.annotation.Propagation;import org.springframework.transaction.annotation.Transactional;import cn.itcast.bean.Person;import cn.itcast.service.PersonService;@Transactionalpublic class PersonServiceBean implements PersonService {private JdbcTemplate jdbcTemplate;public void setDataSource(DataSource dataSource) {this.jdbcTemplate = new JdbcTemplate(dataSource);}//unchecked,可以回滚//checked不会回滚(这个例子就是checked例外)@Transactional( rollbackFor=Exception.class)public void delete(Integer personid) throws Exception{jdbcTemplate.update("delete from person where id=?", new Object[]{personid},new int[]{java.sql.Types.INTEGER});throw new Exception("运行期例外");}//这样注解可以不开启事物(因为这知识查询,)@Transactional(propagation=Propagation.NOT_SUPPORTED)public Person getPerson(Integer personid) {return (Person)jdbcTemplate.queryForObject("select * from person where id=?",new Object[]{personid} ,new int[]{java.sql.Types.INTEGER},new PersonRowMapper());}@Transactional(propagation=Propagation.NOT_SUPPORTED)@SuppressWarnings("unchecked")public List<Person> getPerson() {return (List<Person>)jdbcTemplate.query("select * from person",new PersonRowMapper());}//默认轻快下都是这个@Transactional(propagation=Propagation.REQUIRED)public void save(Person person) {//第一个参数是sql语句,第二个参数是参数(数组),第三个是参数的类型(数组)jdbcTemplate.update("insert into person(name) values(?)", new Object[]{person.getName()},new int[]{java.sql.Types.VARCHAR});}public void update(Person person) {jdbcTemplate.update("update person set name=? where id=?", new Object[]{person.getName(),person.getId()},new int[]{java.sql.Types.VARCHAR,java.sql.Types.INTEGER});}}
junit.test
- package junit.test;
- import org.junit.BeforeClass;
- import org.junit.Test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import org.springframework.transaction.annotation.Transactional;
- import cn.itcast.bean.Person;
- import cn.itcast.service.PersonService;
- public class PersonServiceTest {
- private static PersonService personService;
- @BeforeClass
- public static void setUpBeforeClass() throws Exception {
- try {
- ApplicationContext cxt=new ClassPathXmlApplicationContext("beans.xml");
- personService=(PersonService)cxt.getBean("personService");
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- @Test
- public void save()
- {
- personService.save(new Person("传智播客"));
- }
- @Test
- public void getPerson()
- {
- Person person=personService.getPerson(1);
- System.out.println(person.getName());
- }
- @Test
- public void update()
- {
- Person person=personService.getPerson(1);
- person.setName("sun**");
- personService.update(person);
- }
- @Test
- public void delete()
- {
- try {
- personService.delete(4);
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- @Test
- public void getBeans()
- {
- for(Person person:personService.getPerson())
- {
- System.out.println(person.getName());
- }
- }
- }
beans.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"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
- <context:property-placeholder location="classpath:jdbc.properties"/>
- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
- <property name="driverClassName" value="${driverClassName}"/>
- <property name="url" value="${url}"/>
- <property name="username" value="${username}"/>
- <property name="password" value="${password}"/>
- <!-- 连接池启动时的初始值 -->
- <property name="initialSize" value="${initialSize}"/>
- <!-- 连接池的最大值 -->
- <property name="maxActive" value="${maxActive}"/>
- <!-- 最大空闲值.当经过一个高峰时间后,连接池可以慢慢将已经用不到的连接慢慢释放一部分,一直减少到maxIdle为止 -->
- <property name="maxIdle" value="${maxIdle}"/>
- <!-- 最小空闲值.当空闲的连接数少于阀值时,连接池就会预申请去一些连接,以免洪峰来时来不及申请 -->
- <property name="minIdle" value="${minIdle}"/>
- </bean>
- <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
- <property name="dataSource" ref="dataSource"/>
- </bean>
- <tx:annotation-driven transaction-manager="txManager"/>
- <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean">
- <property name="dataSource" ref="dataSource"/>
- </bean>
- </beans>
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