Hibernate配置文件的书写

<?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>
    <!-- 配置链接那个数据库，怎么连接 -->
    
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/hibernate</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">mysql</property>
    
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <!-- hibernate 其他信息 -->
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    <!-- 设置我的hibernate执行的时候，是否要创建数据库对象：例如表格  
    创建的方式：create：执行一次hibernate我就重新创建数据库对象。  
    update：如果之前已经有这个表格了，那么把这个表格里面的结构更新成我这次要求的样子。如果之前没有这个表格，那么我就重新创建一个。 -->
    <property name="hibernate.hbm2ddl.auto">update</property>
    
    <!--  让session和本地线程绑定，确保我们的session对象唯一 -->
    <property name ="hibernate.current_session_context_class">thread</property> 
    
    
    
    <!--  引入我的映射文件 -->
    <mapping resource="com/ambow/po/User.hbm.xml"/>
    
    
    </session-factory>
    
    
    
    
    </hibernate-configuration>
    
    
    
    
    

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
    <hibernate-mapping>
    <!-- 配置User实体类和表格t_user的映射关系
    
    name：对应的是实体对象的全名称
    table：对应的是数据库中表格的名字
     -->
     <class name="com.ambow.po.User" table="t_user">
     
     <!-- 配置属性和字段的映射关系 -->
     <!--  配置主键 
          name：实体属性
          column：字段
     -->
     <id name="uid" column="uid">
       <!--  设置主键自增   native :根据底层数据库的种类去产生不同的主键自增方式。 -->
       <generator class="native">          
       </generator>
     
     </id>
     <!--  配置普通列
          name：实体属性
          column：字段
     
      -->
      <property name="username" column="username"></property>
      <property name="sex" column="sex"></property>
      <property name="address" column="address"></property>
     
     
     </class>
    
    
    
    </hibernate-mapping>

#
# Hibernate, Relational Persistence for Idiomatic Java
#
# License: GNU Lesser General Public License (LGPL), version 2.1 or later.
# See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
#

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change ‘info‘ to ‘debug‘ ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
log4j.logger.org.hibernate=info

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug

### log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace