第十講:10.spring對事物的支援-程式設計式事務管理
阿新 • • 發佈:2018-11-10
轉賬業務
1,複製spring403-03 改名spring403:建立表結構,資料庫的引擎一定是InnoDB
Create Table |
CREATE TABLE `t_account` ( `id` int(11) NOT NULL, `balance` float NOT NULL, `user_name` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 |
2,新建BankDao介面,新建BankDaoImpl實現類。寫業務邏輯程式碼
BankDao介面:
package com.cruise.dao;
public interface BankDao {
public void InMoney(int money ,int userid );
public void OutMoney(int money ,int
}
BankDaoImpl實現類:
package com.cruise.dao.impl;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import com.cruise.dao.BankDao;
public class BankDaoImpl implements
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
public void setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
}
@Override
public void InMoney(int money, int userid) {
String sql ="update t_account set balance=balance+:money where id=:userid";
MapSqlParameterSource msps= new MapSqlParameterSource();
msps.addValue("money", money);
msps.addValue("userid", userid);
namedParameterJdbcTemplate.update(sql, msps);
}
@Override
public void OutMoney(int money, int userid) {
String sql ="update t_account set balance=balance-:money where id=:userid";
MapSqlParameterSource msps= new MapSqlParameterSource();
msps.addValue("money", money);
msps.addValue("userid", userid);
namedParameterJdbcTemplate.update(sql, msps);
}
}
3,寫BankService介面,寫BankServiceImpl實現類,
BankService介面:
package com.cruise.service;
public interface BankService {
public void transferAccount(int money ,int userA ,int userB);
}
BankServiceImpl實現類:
package com.cruise.service.impl;
import com.cruise.dao.BankDao;
import com.cruise.service.BankService;
public class BankServiceImpl implements BankService{
private BankDao bankDao;
public void setBankDao(BankDao bankDao) {
this.bankDao = bankDao;
}
@Override
public void transferAccount(int money, int userA, int userB) {
bankDao.OutMoney(money, userA);
bankDao.InMoney(money, userB);
}
}
4,刪除沒有的包和類,修改jdbc.properties檔案的資料庫名
5,修改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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="jdbc.properties"/>
<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
bean>
<bean id="namedParameterJdbcTemplate1"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg ref="dataSource1">constructor-arg>
bean>
<bean id="bankDao1" class="com.cruise.dao.impl.BankDaoImpl">
<property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate1">property>
bean>
<bean id="bankService" class="com.cruise.service.impl.BankServiceImpl">
<property name="bankDao" ref="bankDao1">property>
bean>
beans>
6,寫測試-執行
package com.cruise.test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cruise.service.BankService;
public class T {
public static void main(String[] args) {
ClassPathXmlApplicationContext CPXAC=new ClassPathXmlApplicationContext("beans.xml");
BankService bankService = (BankService) CPXAC.getBean("bankService");
bankService.transferAccount(200, 1, 2);
}
}
7,在BankDaoImpl中設定異常程式碼
8,新增事物,在BankServiceImpl新增成員變數TransactionTemplate,set()方法,修改業務程式碼
package com.cruise.service.impl;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
import com.cruise.dao.BankDao;
import com.cruise.service.BankService;
public class BankServiceImpl implements BankService{
private BankDao bankDao;
private TransactionTemplate transactionTemplate;
public void setBankDao(BankDao bankDao) {
this.bankDao = bankDao;
}
public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
this.transactionTemplate = transactionTemplate;
}
@Override
public void transferAccount(int money, int userA, int userB) {
transactionTemplate.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus arg0) {
bankDao.OutMoney(money, userA);
bankDao.InMoney(money, userB);
}
});
}
}
9,在beans.xml中定義jdbc事物管理器的bean,需要把資料來源注入進去;定義transactionTemplate的bean,需要注入事務管理器的bean;再把transactionTemplate的bean注入到BankService中。
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="jdbc.properties"/>
<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!--jdbc事物管理器-->
<bean id="transactionManager1"class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource1"></property>
</bean>
<bean id="transactionTemplate1"class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager" ref="transactionManager1"></property>
</bean>
<bean id="namedParameterJdbcTemplate1"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg ref="dataSource1"></constructor-arg>
</bean>
<bean id="bankDao1" class="com.cruise.dao.impl.BankDaoImpl">
<property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate1"></property>
</bean>
<bean id="bankService" class="com.cruise.service.impl.BankServiceImpl">
<property name="bankDao" ref="bankDao1"></property>
<property name="transactionTemplate" ref="transactionTemplate1"></property>
</bean>
</beans>
10,測試-執行
package com.cruise.test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cruise.service.BankService;
public class T {
public static void main(String[] args) {
ClassPathXmlApplicationContext CPXAC=new ClassPathXmlApplicationContext("beans.xml");
BankService bankService = (BankService) CPXAC.getBean("bankService");
bankService.transferAccount(200, 1, 2);
}
}