hibernate的映射文件配置问题

来源：互联网发布：在淘宝卖衣服怎么进货编辑：程序博客网时间：2024/04/28 14:31

整了几天J2EE环境的配置和hibernate的配置，今天总算让我高兴了一回！昨天搞了一个程序测试hibernate 与MySQL打交道，搞了半天也没搞成，自己也出了不少语法上的错误！今天一大早起来就开始搞，把自己认为所出的错误改完之后，还是没办法连接MySQL

老是这个错误：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:422)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:128)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
at ch03.hibernate.Test.main(Test.java:14)

在网站上搜索相关资料，怀疑是我的映射文件有问题

同时也根据我出错提示中的：“Hibernate Dialect must be explicitly set”

我查看了我的映射XML文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
             "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
             "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
               <>                       <id >                       <generator >
错误就在<generator >hibernate的网站上对主键有解释：
identity
supports identity columns in DB2, MySQL, MS SQL Server, Sybase and HypersonicSQL. The returned identifier is of type long, short or int.

native

picks identity, sequence or hilo depending upon the capabilities of the underlying database.

所以我用native 代替 identity 之后问题就迎刃而解了