Spring 事务配置说明
Spring 如果没有特殊说明，一般指是跟数据存储有关的数据操作事务操作；对于数据持久操作的事务配置，一般有三个对象，数据源，事务管理器，以及事务代理机制；
Spring 提供了多种的底层数据源实现，以及多种类型的事务管理器；所有的管理器都基于 PlatformTransactionManager 接口实现各自的事务策略；
Spring 事务管理采用 AOP 切面代理技术实现，AOP 用于分隔关注点，保证事务的原子性，采用一定的技术 把该关注点 (weaving) 织入到 待完善的关注点上，实现单独组件无法实现的功能，以解决面向对象编程在某些方式下难于实现的操作，更好的支持面向对象的开关原则(扩展开放，修改关闭)。
底层数据源配置
首选加载 数据源配置 .properties 文件;
<bean id="loadProperties" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:META-INF/mybatis/mysql.properties</value> <value>classpath:META-INF/spring/hibernate.properties</value> </list> </property> </bean>
mysql.properties:
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/springdb
username=root
password=xxxxx
filters=stat
initialSize=2
maxActive=300
maxWait=60000
timeBetweenEvictionRunsMillis=60000
minEvictableIdleTimeMillis=300000
validationQuery=SELECT 1
testWhileIdle=true
testOnBorrow=false
testOnReturn=false
poolPreparedStatements=false
maxPoolPreparedStatementPerConnectionSize=200
hibernate.properties:
# hibernate.X hibernate.connection.driverClass=org.gjt.mm.mysql.Driver hibernate.connection.url=jdbc:mysql://localhost:3306/springdb?useUnicode=true&characterEncoding=utf-8 hibernate.dialect=org.hibernate.dialect.MySQL5Dialect hibernate.connection.username=root hibernate.connection.password=xxxxx hibernate.show_sql=true hibernate.hbm2ddl.auto=create-drop
1. JDBC 方式:
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${driver}"></property> <property name="url" value="${url}"></property> <property name="username" value="${username}"></property> <property name="password" value="${password}"></property> </bean>
2. c3p0 方式:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <!-- 指定连接数据库的驱动 --> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <!-- 指定连接数据库的URL --> <property name="jdbcUrl" value="jdbc:mysql://localhost/springdb"/> <!-- 指定连接数据库的用户名 --> <property name="user" value="root"/> <!-- 指定连接数据库的密码 --> <property name="password" value="xxxxx"/> <!-- 指定连接数据库连接池的最大连接数 --> <property name="maxPoolSize" value="40"/> <!-- 指定连接数据库连接池的最小连接数 --> <property name="minPoolSize" value="1"/> <!-- 指定连接数据库连接池的初始化连接数 --> <property name="initialPoolSize" value="1"/> <!-- 指定连接数据库连接池的连接的最大空闲时间 --> <property name="maxIdleTime" value="20"/> </bean>
3. dbcp 方式:
<beans> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${driver}"></property> <property name="url" value="${url}"></property> <property name="username" value="${username}"></property> <property name="password" value="${password}"></property> </bean>
4. Alibaba Druid 方式:
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close" init-method="init" > <property name="url" value="${url}?useUnicode=true&characterEncoding=utf-8"></property> <property name="driverClassName" value="${driver}"></property> <property name="username" value="${username}"></property> <property name="password" value="${password}"></property> <property name="filters" value="${filters}"></property> <property name="maxActive" value="${maxActive}"></property> <property name="maxWait" value="${maxWait}"></property> <property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}"></property> <property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}"></property> <property name="validationQuery" value="${validationQuery}"></property> <property name="testWhileIdle" value="${testWhileIdle}"></property> <property name="testOnBorrow" value="${testOnBorrow}"></property> <property name="testOnReturn" value="${testOnReturn}"></property> <property name="poolPreparedStatements" value="${poolPreparedStatements}"></property> <property name="maxPoolPreparedStatementPerConnectionSize" value="${maxPoolPreparedStatementPerConnectionSize}"></property> </bean>
5. JNDI 全局配置方式:
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="${jndiName}"></property> </bean>
6. 自定义 DataSource:
<bean id="dataSource" class="me.study.hnmapper.utils.CustomDataSource"> <property name="driverClass" value="oracle.jdbc.driver.OracleDriver"></property> <property name="driverUrl" value="jdbc:oracle:thin:@10.30.2.204:1527:sec"></property> <property name="username" value="apps"></property> <property name="password" value="secapp29"></property> </bean>
CustomDataSource:
package me.study.hnmapper.utils; import java.io.PrintWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.SQLFeatureNotSupportedException; import java.util.logging.Logger; import javax.sql.DataSource; public class CustomDataSource implements DataSource { private String driverClass; private String driverUrl; private String username; private String password; @Override public PrintWriter getLogWriter() throws SQLException { // TODO Auto-generated method stub return null; } @Override public void setLogWriter(PrintWriter out) throws SQLException { // TODO Auto-generated method stub } @Override public void setLoginTimeout(int seconds) throws SQLException { // TODO Auto-generated method stub } @Override public int getLoginTimeout() throws SQLException { // TODO Auto-generated method stub return 0; } @Override public Logger getParentLogger() throws SQLFeatureNotSupportedException { // TODO Auto-generated method stub return null; } @Override public <T> T unwrap(Class<T> iface) throws SQLException { // TODO Auto-generated method stub return null; } @Override public boolean isWrapperFor(Class<?> iface) throws SQLException { // TODO Auto-generated method stub return false; } @Override public Connection getConnection() throws SQLException { // TODO Auto-generated method stub return null; } @Override public Connection getConnection(String username, String password) throws SQLException { // TODO Auto-generated method stub // TODO Auto-generated method stub Connection conn = null; try { Class.forName(driverClass); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } conn = DriverManager.getConnection(driverUrl, username, password); return conn; } public String getDriverClass() { return driverClass; } public void setDriverClass(String driverClass) { this.driverClass = driverClass; } public String getDriverUrl() { return driverUrl; } public void setDriverUrl(String driverUrl) { this.driverUrl = driverUrl; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }
6. Hibernate方式，利用的是SessionFactory作为数据源操作；
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="mappingLocations" > <list> <value>classpath*:model/*.hbm.xml</value> </list> </property> <!-- packagesToScan可以自动搜索某个package的全部标记@Entity class --> <!-- <property name="packagesToScan"> <list> <value>hibernatelibs.model*</value> </list> </property> --> <property name="hibernateProperties"> <props> <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop> <prop key="hibernate.dialect">${hibernate.dialect}</prop> <prop key="hibernate.show_sql">${hibernate.show_sql}</prop> </props> </property> </bean>