Hibernate会自动在数据库中创建表格吗？ [英] Does Hibernate create tables in the database automatically

问题描述

http://www.vaannila.com/spring/spring-hibernate-integration-1 .html

在阅读本教程时，他们没有提到在数据库中创建表的任何内容。 Hibernate是否会在我指定它们时通过创建表和字段来自动处理它。

这是我的beans配置。

 <？xml version =1.0encoding =UTF-8？> 
< beans xmlns =http://www.springframework.org/schema/beans
 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xmlns：p =http://www.springframework.org/schema/p
 xsi：schemaLocation =http://www.springframework.org/schema/beans http：// www。 springframework.org/schema/beans/spring-beans.xsd\"> 
 
< bean id =viewResolverclass =org.springframework.web.servlet.view.InternalResourceViewResolverp：prefix =/ WEB-INF / jsp /p：suffix =。 jsp/> 
 
< bean id =myDataSourceclass =org.apache.commons.dbcp.BasicDataSourcedestroy-method =close> 
< property name =driverClassNamevalue =com.mysql.jdbc.Driver/> 
 < property name =usernamevalue =monwwty/> 
< property name =passwordvalue =www/> 
< / bean> 
 
< bean id =mySessionFactoryclass =org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean> 
< property name =dataSourceref =myDataSource/> 
< property name =annotatedClasses> 
< list> 
<值> uk.co.vinoth.spring.domain.User< /值> 
< / list> 
< / property> 
< property name =hibernateProperties> 
<道具> 
< prop key =hibernate.dialect> org.hibernate.dialect.MySQLDialect< / prop> 
< prop key =hibernate.show_sql> true< / prop> 
< prop key =hibernate.hbm2ddl.auto>建立< / prop> 
< /道具> 
< / property> 
< / bean> 
 
< bean id =myUserDAOclass =uk.co.vinoth.spring.dao.UserDAOImpl> 
< property name =sessionFactoryref =mySessionFactory/> 
< / bean> 
 
< bean name =/ user / *。htmclass =uk.co.vinoth.spring.web.UserController> 
< property name =userDAOref =myUserDAO/> 
< / bean> 
 
< / beans> 
  

解决方案

您的hibernate.hbm2ddl.auto设置应该定义创建数据库（选项为 validate ， create ， update 或 create-drop ）

http://www.vaannila.com/spring/spring-hibernate-integration-1.html

Upon reading this tutorial, they have not mentioned anything over creating tables in the DB. Does the Hibernate handle it automatically by creating tables and fields once i specify them.

Here is my beans configuration.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/spring"/>
        <property name="username" value="monwwty"/>
        <property name="password" value="www"/>
    </bean>

    <bean id="mySessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="myDataSource" />
        <property name="annotatedClasses">
            <list>
                <value>uk.co.vinoth.spring.domain.User</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">create</prop>
            </props>
        </property>
    </bean>

    <bean id="myUserDAO" class="uk.co.vinoth.spring.dao.UserDAOImpl">
        <property name="sessionFactory" ref="mySessionFactory"/>
    </bean>

    <bean name="/user/*.htm" class="uk.co.vinoth.spring.web.UserController" >
        <property name="userDAO" ref="myUserDAO" />
    </bean>

</beans>

解决方案

your hibernate.hbm2ddl.auto setting should be defining that the database is created (options are validate, create, update or create-drop)

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