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>