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Spring使用XML方式管理聲明式事務操作?很多新手對此不是很清楚,為了幫助大家解決這個難題,下面小編將為大家詳細講解,有這方面需求的人可以來學習下,希望你能有所收獲。
一 配置文件
<?xml version="1.0" encoding="GBK"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" 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-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- 定義數據源Bean,使用C3P0數據源實現,并注入數據源的必要信息 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" p:driverClass="com.mysql.jdbc.Driver" p:jdbcUrl="jdbc:mysql://localhost/spring" p:user="root" p:password="32147" p:maxPoolSize="40" p:minPoolSize="2" p:initialPoolSize="2" p:maxIdleTime="30" /> <!-- 配置JDBC數據源的局部事務管理器,使用DataSourceTransactionManager 類 --> <!-- 該類實現PlatformTransactionManager接口,是針對采用數據源連接的特定實現 --> <!-- 配置DataSourceTransactionManager時需要依注入DataSource的引用 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" p:dataSource-ref="dataSource" /> <!-- 配置一個業務邏輯Bean --> <bean id="newsDao" class="org.crazyit.app.dao.impl.NewsDaoImpl" p:ds-ref="dataSource" /> <!-- 配置事務增強處理Bean,指定事務管理器 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <!-- 用于配置詳細的事務語義 --> <tx:attributes> <!-- 所有以'get'開頭的方法是read-only的 --> <tx:method name="get*" read-only="true" /> <!-- 其他方法使用默認的事務設置,指定超時時長為5秒 --> <tx:method name="*" isolation="DEFAULT" propagation="REQUIRED" timeout="5" /> </tx:attributes> </tx:advice> <!-- AOP配置的元素 --> <aop:config> <!-- 配置一個切入點,匹配org.crazyit.app.dao.impl包下 所有以Impl結尾的類里、所有方法的執行 --> <aop:pointcut id="myPointcut" expression="execution(* org.crazyit.app.dao.impl.*Impl.*(..))" /> <!-- 指定在myPointcut切入點應用txAdvice事務增強處理 --> <aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut" /> </aop:config> </beans>
二 DAO
1 接口
package org.crazyit.app.dao; public interface NewsDao { public void insert(String title, String content); }
2 實現類
package org.crazyit.app.dao.impl; import javax.sql.DataSource; import java.sql.Connection; import org.springframework.jdbc.core.JdbcTemplate; import org.crazyit.app.dao.*; public class NewsDaoImpl implements NewsDao { private DataSource ds; public void setDs(DataSource ds) { this.ds = ds; } public void insert(String title, String content) { JdbcTemplate jt = new JdbcTemplate(ds); jt.update("insert into news_inf" + " values(null , ? , ?)" , title , content); // 兩次插入的數據違反唯一鍵約束 jt.update("insert into news_inf" + " values(null , ? , ?)" , title , content); // 如果沒有事務控制,則第一條記錄可以被插入 // 如果增加事務控制,將發現第一條記錄也插不進去。 } }
三 測試類
package lee; import org.springframework.context.support.*; import org.springframework.context.*; import org.crazyit.app.dao.*; public class SpringTest { public static void main(String[] args) { // 創建Spring容器 ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); // 獲取事務代理Bean NewsDao dao = (NewsDao)ctx .getBean("newsDao" , NewsDao.class); // 執行插入操作 dao.insert("瘋狂Java" , "輕量級Java EE企業應用實戰"); } }
四 測試結果
數據沒插入到數據庫,說明事務生效
Exception in thread "main" org.springframework.dao.DuplicateKeyException: PreparedStatementCallback; SQL [insert into news_inf values(null , ? , ?)]; Duplicate entry '瘋狂Java' for key 'news_title'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '瘋狂Java' for key 'news_title'
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:239)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:660)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:970)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:980)
at org.crazyit.app.dao.impl.NewsDaoImpl.insert(NewsDaoImpl.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy5.insert(Unknown Source)
at lee.SpringTest.main(SpringTest.java:28)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '瘋狂Java' for key 'news_title'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.Util.getInstance(Util.java:384)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4232)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2334)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2262)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2246)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:147)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:916)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:644)
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