在本例中使用spring为我们提供的jdbc的模版来对spring进行开发。有了spring模版后,程序里就不用再对数据连接进行管理。
所有的 bean均通过自动扫描方式进行注入的。这样可以有效的减少beans.xml中bean的配置。
1、新建一个java项目。名字为 springjdbc。
2、在新建的项目中加入spring、jdbc、dbcp需要的jar包
aspectjrt.jar,aspectjweaver.jar,cglib-nodep-2.1_3.jar,common-annotations.jar,log4j-1.2.14.jar,commons-dbcp.jar,commons-logging.jar,commons-pool.jar,spring.jar.mysql.jar,junit.jar
加入一上jar包
3、在str目录里加下beans.xml配置文件,并对数据库连接池与事务进行配置(事务用注解进行配置).在beans里要加上事务的xml声明。也就是表示事务的头文件。
<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"><!-- spring事务 tx-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="org.gjt.mm.mysql.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" />
<property name="username" value="root" />
<property name="password" value="123" />
<!-- 连接池启动时的初始值 -->
<property name="initialSize" value="1" />
<!-- 连接池的最大值 -->
<property name="maxActive" value="500" />
<!-- 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="2" />
<!-- 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="1" />
</bean>
<!-- 在事务中注入dataSource -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 在JdbcTemplate中注入 dataSource -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 以注解的方式对事务进行管理 -->
<tx:annotation-driven transaction-manager="txManager"/>
<!-- 打开自动扫描 -->
<context:component-scan base-package="cn.ehoo"/>
</beans>
4、编写person.java
package cn.ehoo.bean;
/**
* @author whp
* @Email [email protected]
* @Jan 4, 2011
*
*/
public class Person {
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
5、编写personService.java与PersonServiceBean.java类。
PersonService.java接口类
package cn.ehoo.service;
import java.util.List;
import cn.ehoo.bean.Person;
/**
* @author whp
* @Email [email protected]
* @Jan 4, 2011
*
*/
public interface PersonService {
/**
* 保存
* @param person
*/
public void save(Person person);
/**
*更新
* @param person
*/
public void update(Person person);
/**
* 获取
* @param person
*/
public Person getPerson(Long personId);
/**
* 获取所有
* @param person
*/
public List<Person> getPersons();
/**
* 删除指定记录
* @param person
*/
public void delete(Long personId) throws Exception;
}
PersonServiceBean.java类
package cn.ehoo.service.impl;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import cn.ehoo.bean.Person;
import cn.ehoo.service.PersonService;
/**
* @author whp
* @Email [email protected]
* @Jan 4, 2011
*
*/
@Service("personService")
@Transactional//代表事务要交给spring容器来管理
public class PersonServiceBean implements PersonService {
@Resource private JdbcTemplate jdbcTemplate ;//jdbcTemplate已经在beans.xml文件中进行注入.
public PersonServiceBean() {
}
@Override
public void save(Person person) {
//第一个参数结构化查询语言语句,第二个参数占位符的替换,第三个参数是相应参数的类型
jdbcTemplate.update("insert into person(name) values(?)", new Object[] { person.getName() }, new int[] { java.sql.Types.VARCHAR });
}
@Override
public Person getPerson(Long personId) {
System.out.println(jdbcTemplate);
return (Person)jdbcTemplate.queryForObject("select * from person where id=?", new Object[] {personId }, new PersonRowMapper());
}
@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=true,timeout=30)//这个方法不需要事务 readOnly=true只读 timeout=30超时时间,默认是30S
@SuppressWarnings("unchecked")
@Override
public List<Person> getPersons() {
return jdbcTemplate.query("select * from person", new PersonRowMapper());
}
@Override
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.BIGINT});
}
@Transactional(noRollbackFor =RuntimeException.class)
@Override //@Transactional(rollbackFor =Exception.class)//对于能check的例外,spring默认是不会回滚的,如果想进行回滚,可以用rollbackFor进行回滚。
public void delete(Long personId) throws Exception{//对于用户运行其的uncheck例外,spring容器默认会对事务进行回滚,check是会回滚的
jdbcTemplate.update("delete from person where id=?", new Object[] {personId}, new int[] {java.sql.Types.BIGINT});
//throw new RuntimeException("运行其例外");//对于RuntimeException的例外,默认是会进行回滚的,可以用@Transactional(noRollbackFor =RuntimeException.class)设置成不回滚
throw new Exception("运行其例外");//对于Exception的例外,默认是不会回滚的,可以用@Transactional(rollbackFor =Exception.class)设置成回滚
}
}
6、PersonRowMapper.java这个类的主要做用是。在对PersonServiceBean.java里的方法getPerson使用。因为在请用getPerson方法后,里面要有一个回调,在回调方法里对perosn类时行填充。
package cn.ehoo.service.impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
import cn.ehoo.bean.Person;
/**
* @author whp
* @Email [email protected]
* @Jan 5, 2011
*
*/
public class PersonRowMapper implements RowMapper {
@Override
public Object mapRow(ResultSet rs, int index) throws SQLException {
Person person = new Person();
person.setId(rs.getLong("id"));
person.setName(rs.getString("name"));
return person;
}
}
7、junit进行测试。
package junit.test;
import java.util.List;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.ehoo.bean.Person;
import cn.ehoo.service.PersonService;
/**
* @author whp
* @Email [email protected]
* @Jan 4, 2011
*
*/
public class AOPTest {
static PersonService personService;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
AbstractApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
personService = (PersonService) cxt.getBean("personService");
}
/**
* @author whp
* @Email [email protected]
* @Jan 4, 2011
*
*/
public static void main(String[] args) {
try {
setUpBeforeClass();
Person person = personService.getPerson(2L);
System.out.println(person.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void getPerson(){
Person person = personService.getPerson(2L);
System.out.println(person.getName()+"====");
}
@Test
public void save(){
Person person = new Person();
person.setName("whp100");
personService.save(person);
System.out.println(person.getName()+"====");
}
@Test
public void update(){
Person person = new Person();
person.setId(15L);
person.setName("whp100");
personService.update(person);
System.out.println(person.getName()+"====");
}
@Test
public void getPersons(){
List<Person > persons = personService.getPersons();
System.out.println(persons.size()+"====");
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
}
}