Spring事务

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="${url}?useUnicode=true&amp;characterEncoding=utf-8"></property>
        <property name="driverClassName" value="${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>