hibernate3配置运行后出现的问题.

Question

<?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"><hibernate-configuration>
    
    <session-factory name="java:hibernate/SessionFactory/MyBlog">
    
    
        <property name="hibernate.show_sql">false</property>
        <property name="hibernate.connection.driver_class">
            com.mysql.jdbc.Driver 
        </property>
        <property name="hibernate.connection.url"> 
            jdbc:mysql://localhost:3306/hibernate_test 
        </property>
        <property name="hibernate.connection.username">
            dbuser
        </property>
        <property name="hibernate.connection.password">
            1234
        </property>
        
        <property name="hibernate.dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
        
        
        <mapping resource="Blog.hbm.xml" /> 
        <mapping resource="BlogItem.hbm.xml" /> 
        
    </session-factory>
    
</hibernate-configuration>两个hbm文件如下:

Answer 1

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    
    <class 
        name="BlogItem" 
        table="BLOG_ITEMS" 
        dynamic-update="true">
        
        <id 
            name="id" 
            column="BLOG_ITEM_ID">
            
            <generator class="native"/>
            
        </id>
        
        <property 
            name="title" 
            column="TITLE"
            not-null="true"/>
            
        <property 
            name="text" 
            column="TEXT" 
            not-null="true"/>
            
        <property 
            name="datetime" 
            column="DATE_TIME" 
            not-null="true"/>
            
        <many-to-one 
            name="blog" 
            column="BLOG_ID" 
            not-null="true"/>
            
    </class>
    
</hibernate-mapping>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>
    <class 
        name="Blog" 
        table="BLOGS" >
        
        <id 
            name="id" 
            column="BLOG_ID">
            
            <generator class="native"/>
            
        </id>
        
        <property 
            name="name" 
            column="NAME" 
            not-null="true" 
            unique="true"/>
            
        <bag 
            name="items" 
            inverse="true" 
            order-by="DATE_TIME" 
            cascade="all">
            
            <key column="BLOG_ID"/>
            <one-to-many class="BlogItem"/>
            
        </bag>
        
    </class>
    
</hibernate-mapping>

Answer 2

public class BlogMain {
    
    private SessionFactory _sessions;    public void exportTables() throws HibernateException {
        Configuration cfg = new Configuration()
            .addClass(Blog.class).addClass(BlogItem.class);
        new SchemaExport(cfg).create(true, true);
    }    public static void main(String[] args){
        BlogMain obj = new BlogMain();
        obj.exportTables();
    }
结果就出了如题的错误.请问,hibernate3我的配置有何错误?

Answer 3

hibernate3Annotation中有个TestCase作测试应该没问题，我看你的SessionFactory 不知道什么时候得到值的?应该是_sessions=cfg.buildSessionFactory

Answer 4

用new Configuration().configure().buildSessionFactory()的方式创建SessionFactory。
用你写的那种方式可能忽略了Hibernate.cfg.xml配置文件，得在程序中调用Configuration.setProperty()来设置属性，
如 new Configuration().setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect")

Answer 5

hugebrush() 说的对，你如果直接用new Configuration（）的话，默认的是以hibernate.properties
文件为默认配置文件，要加doConfigure（）这样才是选择hibernate.cfg.xml文件为默认配置文件！