休眠连接池

Question

我似乎无法得到冬眠用C3P0连接池，它说

12:30:35,038 INFO DriverManagerConnectionProvider:64 - Using Hibernate built-in connection pool (not for production use!) 
12:30:35,038 INFO DriverManagerConnectionProvider:65 - Hibernate connection pool size: 20 

Hibernate的配置：

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/xxx?autoReconnect=true</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.connection.password">xxxx</property> 
     <property name="show_sql">false</property> 
     <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
     <property name="hibernate.hbm2ddl.auto">update</property> 
     <property name="hibernate.c3p0.min_size">5</property> 
     <property name="hibernate.c3p0.max_size">200</property> 
     <property name="hibernate.c3p0.max_statements">200</property> 
     <property name="current_session_context_class">thread</property> 
    </session-factory> 
</hibernate-configuration> 

Answer 1

<!DOCTYPE hibernate-configuration PUBLIC 
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
<hibernate-configuration> 
    <session-factory> 

     <!-- datasource config --> 
     <property name="connection.url">jdbc:mysql://localhost:3306/db?useUnicode=true&amp;characterEncoding=UTF-8&amp;autoReconnect=true</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> 
     <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 

     <property name="connection.username">user</property> 
     <property name="connection.password">pass</property> 

     <!-- c3p0 config http://www.hibernate.org/214.html --> 
     <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>   
     <property name="hibernate.c3p0.acquire_increment">1</property> 
     <property name="hibernate.c3p0.idle_test_period">60</property> 
     <property name="hibernate.c3p0.min_size">1</property> 
     <property name="hibernate.c3p0.max_size">2</property> 
     <property name="hibernate.c3p0.max_statements">50</property> 
     <property name="hibernate.c3p0.timeout">0</property> 
     <property name="hibernate.c3p0.acquireRetryAttempts">1</property> 
     <property name="hibernate.c3p0.acquireRetryDelay">250</property> 

     <property name="hibernate.show_sql">true</property> 
     <property name="hibernate.use_sql_comments">true</property> 

     <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property> 
     <property name="hibernate.current_session_context_class">thread</property> 

     ... 

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

Answer 2

解决这些DTD的最佳方式（文档类型定义）映射问题是

1. 以休眠jar文件和unizip/jar并获取这两个文件 - hibernate-configuration dtd文件和hibernate-mapping dtd文件。

2. 从这两个文件复制DTD声明并分别在您的 cfg.xml和hbm.xml中使用它们。

这解决了我的问题。