Spring提供了一致的事務管理抽象。這個抽象是Spring最重要的抽象之一， 它有如下的優(yōu)點：
1.為不同的事務API提供一致的編程模型，如JTA、JDBC、Hibernate、iBATIS數據庫層 和JDO
2.提供比大多數事務API更簡單的，易于使用的編程式事務管理API
3.整合Spring數據訪問抽象
4.支持Spring聲明式事務管理
環(huán)境:eclipse3.0,JDK1.4,spring1.2.3,mysql
程序主體代碼如下:
配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "
<beans>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" destroy-method="close">
<property name="driverClassName">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="url">
<value>jdbc:mysql://localhost:3306/test</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value>1234</value>
</property>
</bean>
<bean id="business" class="databaserollback.BusinessImpl">
<property name="dataSource">
<ref bean="dataSource"/>
</property>
</bean>
<bean id="dbTransactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref bean="dataSource"/>
</property>
</bean>
<bean id="accountservice" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" >
<property name="transactionManager" ><ref bean="dbTransactionManager" /></property>
<property name="target">
<ref bean="business" />
</property>
<property name="transactionAttributes" >
<props>
<prop key="insertOne">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
</beans>
|
業(yè)務類:
public class BusinessImpl implements Business {
DataSource
dataSource = null;
/**
* @throws SQLException
*
*/
public void insertOne() {
Connection conn =
DataSourceUtils.getConnection(dataSource);
Statement stat;
try {
stat = conn.createStatement();
String sql = "insert into room1 (room_id,address) values
('1','dalian')";
String sql1 = "insert into room1 (room_id,address)
values ('1','dalian')";
stat.executeUpdate(sql);
stat.executeUpdate(sql1);
} catch (SQLException e) {
}
System.out.println("insertOne");
}
/**
* @return Returns the ds.
*/
public DataSource
getDataSource() {
return dataSource;
}
/**
*
@param ds The ds to set.
*/
public void setDataSource(DataSource
dataSource) {
this.dataSource = dataSource;
}
}
|
測試類:
public class Test {
protected static PlatformTransactionManager transactionManager;
protected static TransactionStatus transactionStatus;
public static void main(String[] args) throws SQLException {
ClassPathResource res;
XmlBeanFactory factory;
res = new ClassPathResource("Appcontext.xml");
factory = new XmlBeanFactory(res);
//transactionManager = (PlatformTransactionManager) factory.getBean("dbTransactionManager");
//transactionStatus = transactionManager.getTransaction(new DefaultTransactionDefinition());
Business bi = (Business) factory.getBean("accountservice");
//
// try {
bi.insertOne();
// } catch (SQLException e) {
// transactionManager.rollback(transactionStatus);
// }
}
}
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因為使用的數據庫是mysql,所以建立表的時候要指定INNODB,來支持事務!
CREATE TABLE room1 (
ROOM_ID varchar(10),
ADDRESS varchar(32),
PRIMARY KEY (ROOM_ID)
) TYPE=INNODB;
執(zhí)行這段代碼之后,控制臺拋出錯誤,查詢數據庫,發(fā)現事務沒有回滾,為什么呢??
首先要了解spring處理事務的本質,只有當程序拋出一個RuntimeException-->DataAccessException是spring才會捕獲他,并且進行事務的處理!
我們將上面的業(yè)務類修改一下,使用spring封裝的JDBCTemplate
JdbcTemplate jt = new JdbcTemplate(dataSource);
jt.update("insert into room1 (room_id,address) values ('1','dalian')");
jt.update("insert into room1 (room_id,address) values ('1','dalian')");
重新運行代碼,發(fā)現數據庫成功回滾!但是spring的template雖然很方便,但是對JDBC的支持還是不夠完善,所以很多人還是喜歡用原生的JDBC來操作數據庫,根據spring對事務操作的特點,我們對程序中拋出的SQLException坐一下改造
catch (SQLException e) {
throw new MyUncheckException(e.toString());
}
public class MyUncheckException extends DataAccessException {
/**
* @param msg
*/
public MyUncheckException(String msg) {
super(msg);
// TODO Auto-generated constructor stub
}
}
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然后修改配置文件
<prop key="insertOne">PROPAGATION_REQUIRED,-MyUncheckException</prop>
添加的-MyUncheckException指定如果方法拋出MyUncheckException或它的子類，事務將 會自動回滾。可以用逗號分隔定義多個回滾規(guī)則。-前綴強制回滾，+前綴指定提 交
重新運行代碼,成功!!
posted on 2008-06-15 14:32
Hank1026 閱讀(207)
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