Question

我开发了报告工具的应用程序我必须连接多个远程端数据库及其凭据并获取数据库值我怎么能这样做？
这是我的hibernate配置文件

<hibernate-configuration>
  <session-factory>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="show_sql">true</property>
   <property name="hibernate.hbm2ddl.auto">update</property>

    <property name="hibernate.connection.SetBigStringTryClob">true</property>

    <property name="hibernate.jdbc.batch_size">0</property>

  </session-factory>
</hibernate-configuration>

Answer 1

您应该为每个DBS配置单独的会话工厂和数据源配置，您可以通过数据源名称引用正确的会话工厂和数据源配置。

这意味着如果您有3个远程数据库，那么理想情况下您应该有3个sessionFacories和数据源。

示例：

hibernate-first.cfg.xml - 与您一样

<hibernate-configuration>
  <session-factory>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="show_sql">true</property>
   <property name="hibernate.hbm2ddl.auto">update</property>

    <property name="hibernate.connection.SetBigStringTryClob">true</property>

    <property name="hibernate.jdbc.batch_size">0</property>

    <!-- Here commes the entities mapped to tables in the FIRST database -->
    <mapping class="com.yourpackage.EntityOftheFirstDatabase" />

  </session-factory>

hibernate-second.cfg.xml

<hibernate-configuration>
  <session-factory>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="show_sql">true</property>
   <property name="hibernate.hbm2ddl.auto">update</property>

    <property name="hibernate.connection.SetBigStringTryClob">true</property>

    <property name="hibernate.jdbc.batch_size">0</property>

    <!-- Here commes the entities mapped to tables in the SECOND database -->
    <mapping class="com.yourpackage.EntityOftheSecondDatabase" />

  </session-factory>

现在让我们在春天配置会话工厂：

<!-- Hibernate SessionFactory for the FIRST database -->
    <bean id="sessionFactoryForTheFirstDatabase" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSourceForTheFirstDatabase" />
        <property name="configLocation" value="classpath:hibernate-first.cfg.xml" />
    </bean>



<!-- Hibernate SessionFactory for the SECOND database -->
        <bean id="sessionFactoryForTheSecondDatabase" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
            <property name="dataSource" ref="dataSourceForTheSecondDatabase" />
            <property name="configLocation" value="classpath:hibernate-second.cfg.xml" />
        </bean>

<强>数据源

<bean id="dataSourceForTheFirstDatabase" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="your specific" />
        <property name="url" value="${database.url}" />
        <property name="username" value="${database.username}" />
        <property name="password" value="${database.password}" />
    </bean>

第二个数据源只是指向第二个数据库。如果要配置Tx管理，则需要两个事务管理器用于数据库：

<bean id="firstDbServiceProxyCreator" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
        <description>Transaction boundaries are mapped to service layer</description>
        <property name="proxyTargetClass" value="false" />
        <property name="beanNames">
          <list>
        <value>ServicesMangingoperationsAboveYourFirstDatabase1</value>
        <value>ServicesMangingoperationsAboveYourFirstDatabase2</value>
          </list>
        </property>  
        <property name="interceptorNames">
          <list>
            <value>FirstDbTxInterceptor</value>
          </list>
        </property>
    </bean>

如果你想在多个数据库中拥有单一交易，也可以，不管你是否需要它都不知道！希望这对你来说足够清楚。我知道有更多奇特的方法来定义TX管理器和弹簧的东西，主要是如果你使用最新的，我会建议你尝试我所描述的，然后你可以调整它 - 谷歌是你的朋友：）

Answer 2

为了连接多个数据库，写一个会话工厂并不好。所以有多少数据库，如果你想连接写多个配置文件是最好的方法。例如假设，我想连接 oracle，mysql 数据库。所以我可以做的是我将为oracle编写一个配置文件，即 oracle-configuration.cfg.xml ，对于mysql，我将创建 mysql-configuration.cfg.xml < / p>

现在您的问题是要连接远程数据库，您需要为远程地址提供凭据。

例如，我的远程数据库地址是 192.168.0.14 。现在我想连接oracle数据库现在连接属性如

<强>甲骨文configuration.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.username">ranga</property>
<property name="connection.password">ranga</property>
<property name="connection.url">jdbc:oracle:thin:@192.168.0.14:1521:XE</property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>

<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>

<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">create</property>

<mapping resource="com/ranga/mapping/Persom.hbm.xml"/>

</session-factory>
</hibernate-configuration>

如何在hibernate中获取远程端数据库的数据

2 个答案: