Spring 4.x （三）
1 Spring中加入DataSource并引入jdbc.properties
- 步骤：
- ①加入c3p0的jar包和mysql的驱动包
- ②在src下新建jdbc.propertes文件
jdbc.driverClass=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/spring jdbc.user=root jdbc.password=root
- ③在applicationContext.xml中配置加载jdbc.properties的类
<?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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!--
配置加载jdbc.properties的类
-->
<context:property-placeholder location="classpath*:jdbc.properties"></context:property-placeholder>
<!--
配置c3p0连接池
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
</beans>
2 Spring jdbcTemplate
- Spring的jdbc Template使用的是模板技术。
- 观察如下代码的结构：
- jdbcDaoSupport.java
- jdbcTemplate.java
- jdbcAccessor.java
- 我们可以得出如下的规律
- 看看Hibernate是不是也这样：
- HibernateDaoSupport.java
- 示例：使用Spring的jdbc Template来实现CRUD
- dao层
- PersonDao.java
- dao层
package com.xuweiwei.dao;
import java.sql.ResultSet;
public interface PersonDao {
public static final String DAO_NAME = "com.xuweiwei.dao.impl.PersonDaoImpl";
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonDaoImpl.java
package com.xuweiwei.dao.impl;
import com.xuweiwei.dao.PersonDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
import javax.annotation.Resource;
import javax.sql.DataSource;
import java.sql.ResultSet;
@Repository(PersonDao.DAO_NAME)
public class PersonDaoImpl extends JdbcDaoSupport implements PersonDao {
@Resource(name = "dataSource")
public void setDataSourcePerson(DataSource dataSource){
super.setDataSource(dataSource);
}
@Override
public void save(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void delete(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void update(String sql) {
this.getJdbcTemplate().execute(sql);
}
}
- service层
- PersonService.java
- service层
package com.xuweiwei.service;
public interface PersonService {
public static final String SERVICE_NAME = "com.xuweiwei.service.impl.PersonServiceImpl";
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonServiceImpl.java
package com.xuweiwei.service.impl;
import com.xuweiwei.dao.PersonDao;
import com.xuweiwei.service.PersonService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service(PersonService.SERVICE_NAME)
public class PersonServiceImpl implements PersonService {
@Resource(name=PersonDao.DAO_NAME)
private PersonDao personDao;
@Override
public void save(String sql) {
personDao.save(sql);
}
@Override
public void delete(String sql) {
personDao.delete(sql);
}
@Override
public void update(String sql) {
personDao.update(sql);
}
}
- applicationContext.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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!--
配置加载jdbc.properties的类
-->
<context:property-placeholder location="classpath*:jdbc.properties"></context:property-placeholder>
<!--
配置c3p0连接池
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<context:component-scan base-package="com.xuweiwei"/>
</beans>
- 测试
package com.xuweiwei.test;
import com.xuweiwei.service.PersonService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestJdbcTemplate {
@Test
public void add(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
PersonService personService = (PersonService) context.getBean(PersonService.SERVICE_NAME);
String sql = " insert into student(name,description) values ('许威威','java开发') ";
personService.save(sql);
}
@Test
public void update(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
PersonService personService = (PersonService) context.getBean(PersonService.SERVICE_NAME);
String sql = " update student set description ='Linux开发' where sid = 1 ";
personService.update(sql);
}
@Test
public void delete(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
PersonService personService = (PersonService) context.getBean(PersonService.SERVICE_NAME);
String sql = " delete from student where sid = 1 ";
personService.delete(sql);
}
}
3 Spring的事务控制
3.1 引入Spring的事务控制
- 如果在上面的代码中，加入如下的代码
@Override
public void save(String sql) {
personDao.save(sql);
int a = 1 /0 ;
personDao.save(sql);
}
- 会发现当发生异常的时候，事务并没有回滚，我们可以通过查看数据库知道，已经插入了一条数据。但是，这显示是不符合实际的，所以，Spring给我们提供了对事务的控制，当前表现形式不同，其实原理是一样的。
3.2 声明式事务
3.2.1 事务管理器
- Spring对不同的技术实现提供了不同的事务管理器，当然，如果我们自己去写一个框架，那么要和Spring整合，也需要遵守Spring的规则。
- Spring提供了一个PlatformTransactionManager的接口，详细代码如下
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package org.springframework.transaction;
public interface PlatformTransactionManager {
TransactionStatus getTransaction(TransactionDefinition var1) throws TransactionException;
void commit(TransactionStatus var1) throws TransactionException;
void rollback(TransactionStatus var1) throws TransactionException;
}
- PlatformTransactionManager接口有一个抽象实现类是AbstractPlatformTransactionManager，其简化代码如下
public abstract class AbstractPlatformTransactionManager implements PlatformTransactionManager, Serializable {
public final TransactionStatus getTransaction(TransactionDefinition definition) throws TransactionException {
Object transaction = this.doGetTransaction();
}
protected abstract Object doGetTransaction() throws TransactionException;
public final void rollback(TransactionStatus status) throws TransactionException {
if (status.isCompleted()) {
throw new IllegalTransactionStateException("Transaction is already completed - do not call commit or rollback more than once per transaction");
} else {
DefaultTransactionStatus defStatus = (DefaultTransactionStatus)status;
this.processRollback(defStatus);
}
}
public final void commit(TransactionStatus status) throws TransactionException {
if (status.isCompleted()) {
throw new IllegalTransactionStateException("Transaction is already completed - do not call commit or rollback more than once per transaction");
} else {
DefaultTransactionStatus defStatus = (DefaultTransactionStatus)status;
if (defStatus.isLocalRollbackOnly()) {
if (defStatus.isDebug()) {
this.logger.debug("Transactional code has requested rollback");
}
this.processRollback(defStatus);
} else if (!this.shouldCommitOnGlobalRollbackOnly() && defStatus.isGlobalRollbackOnly()) {
if (defStatus.isDebug()) {
this.logger.debug("Global transaction is marked as rollback-only but transactional code requested commit");
}
this.processRollback(defStatus);
if (status.isNewTransaction() || this.isFailEarlyOnGlobalRollbackOnly()) {
throw new UnexpectedRollbackException("Transaction rolled back because it has been marked as rollback-only");
}
} else {
this.processCommit(defStatus);
}
}
}
}
- DataSourceTransManager.java
public class DataSourceTransactionManager extends AbstractPlatformTransactionManager implements ResourceTransactionManager, InitializingBean {
protected Object doGetTransaction() {
DataSourceTransactionManager.DataSourceTransactionObject txObject = new DataSourceTransactionManager.DataSourceTransactionObject();
txObject.setSavepointAllowed(this.isNestedTransactionAllowed());
ConnectionHolder conHolder = (ConnectionHolder)TransactionSynchronizationManager.getResource(this.dataSource);
txObject.setConnectionHolder(conHolder, false);
return txObject;
}
}
- 示例：
- PersonDao.java
package com.xuweiwei.dao;
public interface PersonDao {
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonDaoImpl.java
package com.xuweiwei.dao.impl;
import com.xuweiwei.dao.PersonDao;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class PersonDaoImpl extends JdbcDaoSupport implements PersonDao {
@Override
public void save(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void delete(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void update(String sql) {
this.getJdbcTemplate().execute(sql);
}
}
- PersonService.java
package com.xuweiwei.service;
public interface PersonService {
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonServiceImpl.java
package com.xuweiwei.service.impl;
import com.xuweiwei.dao.PersonDao;
import com.xuweiwei.service.PersonService;
public class PersonServiceImpl implements PersonService {
private PersonDao personDao;
public void setPersonDao(PersonDao personDao) {
this.personDao = personDao;
}
@Override
public void save(String sql) {
personDao.save(sql);
int a = 1 /0 ;
personDao.save(sql);
}
@Override
public void delete(String sql) {
personDao.delete(sql);
}
@Override
public void update(String sql) {
personDao.update(sql);
}
}
- jdbc.properties
jdbc.driverClass=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/spring jdbc.user=root jdbc.password=root
- applicationContext.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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!--
配置加载jdbc.properties的类
-->
<context:property-placeholder location="classpath*:jdbc.properties"></context:property-placeholder>
<!--
配置c3p0连接池
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id="personDao" class="com.xuweiwei.dao.impl.PersonDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="personService" class="com.xuweiwei.service.impl.PersonServiceImpl">
<property name="personDao" ref="personDao"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:advice id="tx" transaction-manager="transactionManager">
<!--
告诉spring容器什么样的目标方法采用什么样的事务策略
name 用来说明目标方法
save* 以save开头的目标方法
isolation 隔离属性
propagation 传播属性
是解决事务嵌套问题的
read-only
为true:只读事务 只能读
为false:读写事务
-->
<tx:attributes>
<tx:method name="save*" isolation="DEFAULT" propagation="REQUIRED" read-only="false" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="pointcut" expression="execution(* com.xuweiwei.service.impl.PersonServiceImpl.*(..))"/>
<aop:advisor advice-ref="tx" pointcut-ref="pointcut"/>
</aop:config>
</beans>
- 测试
package com.xuweiwei.test;
import com.xuweiwei.service.PersonService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestJdbcTemplate {
@Test
public void add(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
PersonService personService = (PersonService) context.getBean("personService");
String sql = " insert into student(name,description) values ('许威威','java开发') ";
personService.save(sql);
}
}
3.3 编程式事务
- PersonDao.java
package com.xuweiwei.dao;
public interface PersonDao {
public static final String DAO_NAME = "com.xuweiwei.dao.impl.PersonDaoImpl";
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonDaoImpl.java
package com.xuweiwei.dao.impl;
import com.xuweiwei.dao.PersonDao;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
import javax.annotation.Resource;
import javax.sql.DataSource;
@Repository(PersonDao.DAO_NAME)
public class PersonDaoImpl extends JdbcDaoSupport implements PersonDao {
@Resource(name="dataSource")
public void setDataSourceDi(DataSource dataSource){
super.setDataSource(dataSource);
}
@Override
public void save(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void delete(String sql) {
this.getJdbcTemplate().execute(sql);
}
@Override
public void update(String sql) {
this.getJdbcTemplate().execute(sql);
}
}
- PersonService.java
package com.xuweiwei.service;
public interface PersonService {
public static final String SERVICE_NAME = "com.xuweiwei.service.impl.PersonServiceImpl";
/**
* 增加
* @param sql
*/
public void save(String sql);
/**
* 删除
*/
public void delete(String sql);
public void update(String sql);
}
- PersonServiceImpl.java
package com.xuweiwei.service.impl;
import com.xuweiwei.dao.PersonDao;
import com.xuweiwei.service.PersonService;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
@Transactional
@Service(PersonService.SERVICE_NAME)
public class PersonServiceImpl implements PersonService {
@Resource(name=PersonDao.DAO_NAME)
private PersonDao personDao;
@Override
public void save(String sql) {
personDao.save(sql);
int a = 1 /0 ;
personDao.save(sql);
}
@Override
public void delete(String sql) {
personDao.delete(sql);
}
@Override
public void update(String sql) {
personDao.update(sql);
}
}
- jdbc.properties
jdbc.driverClass=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/spring jdbc.user=root jdbc.password=root
- applicationContext.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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!--
配置加载jdbc.properties的类
-->
<context:property-placeholder location="classpath*:jdbc.properties"></context:property-placeholder>
<!--
配置c3p0连接池
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<context:property-placeholder location="classpath*:jdbc.properties"/>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启编程式事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
- 测试
package com.xuweiwei.test;
import com.xuweiwei.service.PersonService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestJdbcTemplate {
@Test
public void add(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
PersonService personService = (PersonService) context.getBean("personService");
String sql = " insert into student(name,description) values ('许威威','java开发') ";
personService.save(sql);
}
}
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