Hibernate将数据库更改从oracle更改为mysql

Question

I am using Spring and Hibernate in my project. My database has changed from Oracle 10g to MySQL .

Can you please tell me what changes do I need to make in my Hibernate configuration?

Also are there any changes required in my Java code.

Answer 1

If you are using the hibernate.cfg.xml for your project to define the database property, then you need to change it to the below values for MySQL :-

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM 
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/{db.name}</property>
        <property name="hibernate.connection.username">{db.name}</property>
        <property name="hibernate.connection.password">{db.password}</property>

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

Also you need to include the mysql-connector jar in your pom.xml for example

  <!--Mysql-Connector-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.36</version>
        </dependency>

if you are not using the hibernate.cfg.xml and instead using some sessionFactory bean in your Spring ApplicationContext.xml . Then you need to change it to below :-

<bean id="sessionFactory"
          class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="annotatedClasses">

        </property>
        <property name="hibernateProperties">
            <props>
                <!-- As of now not using hibernate.cfg.xml -->
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.validator.apply_to_ddl">false</prop>
                <prop key="hibernate.validator.autoregister_listeners">false</prop>
                <prop key="show_sql">true</prop>
                <prop key="format_sql">true</prop>
            </props>
        </property>
    </bean>

<bean id="dataSource"
    class="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
      <property name="driverClassName" value="${jdbc.driverClassName}" />
      <property name="url" value="${jdbc.url}" />
      <property name="username" value="${jdbc.user}" />
      <property name="password" value="${jdbc.pass}" />
   </bean>

Please follow http://www.baeldung.com/hibernate-4-spring for complete example on how to setup hibernate with spring.