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  • hibernate与ssm多数据源配置

    hibernate:

    1.配置多个数据源,比如2个:hibernate.cfg1.xml~hibernate.cfg8.xml

    <?xml version='1.0' encoding='UTF-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
              "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
              "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
    
    <!-- Generated by MyEclipse Hibernate Tools.                   -->
    <hibernate-configuration>
        <session-factory>
            <property name="dialect">com.standsoft.dialect.DialectForInkfish</property>
            <property name="connection.url">jdbc:sqlserver://localhost:1433;DatabaseName=zhangyanandb</property>
            <property name="connection.username">sa</property>
            <property name="connection.password">111111</property>
            <property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
            <property name="myeclipse.connection.profile">sql2008-4</property>
            <property name="show_sql">true</property>
            <property name="format_sql">true</property>
            <mapping resource="com/standsoft/DictArea.hbm.xml" />
        </session-factory>
    </hibernate-configuration> 
    View Code

    2.配置两个sessionfactory

    package com.orm;
    
    import org.hibernate.HibernateException;
    import org.hibernate.Session;
    import org.hibernate.cfg.Configuration;
    
    /**
     * Configures and provides access to Hibernate sessions, tied to the current
     * thread of execution. Follows the Thread Local Session pattern, see
     * {@link http://hibernate.org/42.html }.
     */
    public class HibernateSessionFactory1{
    
        /**
         * Location of hibernate.cfg.xml file. Location should be on the classpath
         * as Hibernate uses #resourceAsStream style lookup for its configuration
         * file. The default classpath location of the hibernate config file is in
         * the default package. Use #setConfigFile() to update the location of the
         * configuration file for the current session.
         */
        private static String CONFIG_FILE_LOCATION = "/hibernate.cfg1.xml";
        private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
        private static Configuration configuration = new Configuration();
        private static org.hibernate.SessionFactory sessionFactory;
        private static String configFile = CONFIG_FILE_LOCATION;
        static {
            try {
                configuration.configure(configFile);
                sessionFactory = configuration.buildSessionFactory();
            } catch (Exception e) {
                System.err.println("%%%% Error Creating SessionFactory %%%%");
                e.printStackTrace();
            }
        }
    
        private HibernateSessionFactory1() {
        }
    
        /**
         * Returns the ThreadLocal Session instance. Lazy initialize the
         * <code>SessionFactory</code> if needed.
         *
         * @return Session
         * @throws HibernateException
         */
        public static Session getSession() throws HibernateException {
            Session session = threadLocal.get();
    
            if (session == null || !session.isOpen()) {
                if (sessionFactory == null) {
                    rebuildSessionFactory();
                }
                session = (sessionFactory != null) ? sessionFactory.openSession() : null;
                threadLocal.set(session);
            }
    
            return session;
        }
    
        /**
         * Rebuild hibernate session factory
         *
         */
        public static void rebuildSessionFactory() {
            try {
                configuration.configure(configFile);
                sessionFactory = configuration.buildSessionFactory();
            } catch (Exception e) {
                System.err.println("%%%% Error Creating SessionFactory %%%%");
                e.printStackTrace();
            }
        }
    
        /**
         * Close the single hibernate session instance.
         *
         * @throws HibernateException
         */
        public static void closeSession() throws HibernateException {
            Session session = threadLocal.get();
            threadLocal.set(null);
    
            if (session != null) {
                session.close();
            }
        }
    
        /**
         * return session factory
         *
         */
        public static org.hibernate.SessionFactory getSessionFactory() {
            return sessionFactory;
        }
    
        /**
         * return session factory
         *
         * session factory will be rebuilded in the next call
         */
        public static void setConfigFile(String configFile) {
            HibernateSessionFactory1.configFile = configFile;
            sessionFactory = null;
        }
    
        /**
         * return hibernate configuration
         *
         */
        public static Configuration getConfiguration() {
            return configuration;
        }
    
    }
    View Code

    3.配置调度类sessionfactory

    package com.orm;
    
    import org.hibernate.HibernateException;
    import org.hibernate.Session;
    
    /**
     * Configures and provides access to Hibernate sessions, tied to the current
     * thread of execution. Follows the Thread Local Session pattern, see
     * {@link http://hibernate.org/42.html }.
     */
    public class HibernateSessionFactory {
        public static Session currentSession;
        
    
        public static Session getCurrentSession() {
            return currentSession;
        }
    
    
        public static void setCurrentSession(Session currentSession) {
            HibernateSessionFactory.currentSession = currentSession;
        }
    
    
        public static Session getSession() throws HibernateException {
            return currentSession;
        }
    }
    View Code

    4.参考http://www.cnblogs.com/yanan7890/p/8681566.html切换数据源

    HibernateSessionFactory.setCurrentSession(HibernateSessionFactory1.getSession());

    HibernateSessionFactory.setCurrentSession(HibernateSessionFactory2.getSession());

     以上就是纯hibernate的多数据源配置操作,已验证可以使用。但觉得哪儿有问题,也没测出来,希望大佬指正

    ssm:

    1.配置多个数据源,比如2个:resource/db.properties

    jdbc.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
    jdbc.url=jdbc:sqlserver://localhost:1433; DatabaseName=zhangyanandb
    jdbc.username=sa
    jdbc.password=11111
    
    jdbc2.url=jdbc:sqlserver://localhost:1433; DatabaseName=zhangyanandb2
    jdbc2.username=sa
    jdbc2.password=11111
    View Code

    2.交给spring管理两个数据库连接

        <!-- 数据库连接池 -->
        <!-- 加载配置文件 -->
        <context:property-placeholder location="classpath:resource/db.properties" />
        <!-- 数据库连接池 -->
        <bean id="dataSource1" class="com.alibaba.druid.pool.DruidDataSource"
            destroy-method="close">
            <property name="url" value="${jdbc.url}" />
            <property name="username" value="${jdbc.username}" />
            <property name="password" value="${jdbc.password}" />
            <property name="driverClassName" value="${jdbc.driver}" />
            <property name="maxActive" value="10" />
            <property name="minIdle" value="5" />
        </bean>
    
            <!-- 数据库连接池 -->
        <bean id="dataSource2" class="com.alibaba.druid.pool.DruidDataSource"
            destroy-method="close">
            <property name="url" value="${jdbc2.url}" />
            <property name="username" value="${jdbc2.username}" />
            <property name="password" value="${jdbc2.password}" />
            <property name="driverClassName" value="${jdbc.driver}" />
            <property name="maxActive" value="10" />
            <property name="minIdle" value="5" />
        </bean>
        
         <!-- 动态数据源 -->
    <bean id="dynamicDataSource" class="util.DynamicDataSource">
        <property name="targetDataSources">  
            <map key-type="java.lang.String">
                <!-- 指定lookupKey和与之对应的数据源 -->
                <entry key="dataSource1" value-ref="dataSource1"></entry>  
                <entry key="dataSource2" value-ref="dataSource2"></entry>
            </map>  
        </property>  
        <!-- 这里可以指定默认的数据源 -->
        <property name="defaultTargetDataSource" ref="dataSource1" />  
    </bean>
    View Code

    3.spring配置sessionfactory

        <!-- 配置sqlsessionFactory -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
            <property name="configLocation" value="classpath:resource/SqlMapConfig.xml"></property>
            <property name="dataSource" ref="dynamicDataSource"></property>
        </bean>
        
    View Code

    4.配置事物

    <!-- 事务管理器 -->
        <bean id="transactionManager"
            class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <!-- 数据源 -->
            <property name="dataSource" ref="dynamicDataSource" />
        </bean>
        <!-- 通知 -->
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <tx:attributes>
                <!-- 传播行为 -->
                <tx:method name="save*" propagation="REQUIRED" />
                <tx:method name="insert*" propagation="REQUIRED" />
                <tx:method name="add*" propagation="REQUIRED" />
                <tx:method name="create*" propagation="REQUIRED" />
                <tx:method name="delete*" propagation="REQUIRED" />
                <tx:method name="update*" propagation="REQUIRED" />
                <tx:method name="find*" propagation="SUPPORTS" read-only="true" />
                <tx:method name="select*" propagation="SUPPORTS" read-only="true" />
                <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
            </tx:attributes>
        </tx:advice>
    View Code

    5.配置DynamicDataSource类及DynamicDataSourceHolder类供选择调用

    import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
    
    public class DynamicDataSource extends AbstractRoutingDataSource {
    
        /**
         *  该方法返回需要使用的DataSource的key值,
         *  然后根据这个key从resolvedDataSources这个map里取出对应的DataSource,
         *  如果找不到,则用默认的resolvedDefaultDataSource。
         */
        @Override
        protected Object determineCurrentLookupKey() {
            // 从自定义的位置获取数据源标识
            return DynamicDataSourceHolder.getDataSource();
        }
    
    }
    View Code
    public class DynamicDataSourceHolder {
        /**
         * 注意:数据源标识保存在线程变量中,避免多线程操作数据源时互相干扰
         */
        private static final ThreadLocal<String> THREAD_DATA_SOURCE = new ThreadLocal<String>();
    
        public static String getDataSource() {
            return THREAD_DATA_SOURCE.get();
        }
    
        public static void setDataSource(String dataSource) {
            THREAD_DATA_SOURCE.set(dataSource);
        }
    
        public static void clearDataSource() {
            THREAD_DATA_SOURCE.remove();
        }
    
    }
    View Code

    6切换数据源

    DynamicDataSourceHolder.setDataSource("dataSource1");

    DynamicDataSourceHolder.setDataSource("dataSource2");

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  • 原文地址:https://www.cnblogs.com/yanan7890/p/8681643.html
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