Hibernate5 四种数据源配置

时间:2024-01-21 17:11:41

1.需要知道的:

 

  1. DBCP在hibernate3中以及不再被支持了,由于作者提出过bug,后续版本没有加入对其的支持。
  2. 推荐使用proxool,负面新闻最少的连接池
  3. 下面的图显示了,Hibernate 数据源的四种,分别是C3p0、JDBC、JNDI、Proxool,下面分别做解析

C3p0:

 1 <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
 2         <property name="hibernate.connection.password">root</property>
 3         <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
 4         <property name="hibernate.connection.username">root</property>
 5         <property name="hibernate.default_catalog">hibernate</property>
 6         <property name="hibernate.default_schema">testdb</property>
 7         <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
 8         <property name="hibernate.show_sql">true</property>
 9         <property name="hibernate.format_sql">true</property>
10         <property name="hibernate.hbm2ddl.auto">create</property>
11         <property name="connection.useUnicode">true</property>
12         <property name="connection.characterEncoding">UTF-8</property>
13         <!-- C3P0连接池配置 -->
14         <property name="hibernate.connection.provider_class">org.hibernate.c3p0.internal.C3P0ConnectionProvider</property>
15         <property name="hibernate.c3p0.max_size">20</property>
16         <property name="hibernate.c3p0.min_size">5</property>
17         <property name="hibernate.c3p0.timeout">120</property>
18         <property name="hibernate.c3p0.max_statements">100</property>
19         <property name="hibernate.c3p0.idle_test_period">120</property>
20         <property name="hibernate.c3p0.acquire_increment">2</property>

 

JDBC:

在没有做任何配置的情况下,默认就是JDBC 由Hibernate 自发完成对数据库连接的创建

 1 <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
 2         <property name="hibernate.connection.password">root</property>
 3         <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
 4         <property name="hibernate.connection.username">root</property>
 5         <property name="hibernate.default_catalog">hibernate</property>
 6         <property name="hibernate.default_schema">testdb</property>
 7         <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
 8         <property name="hibernate.show_sql">true</property>
 9         <property name="hibernate.format_sql">true</property>
10         <property name="hibernate.hbm2ddl.auto">create</property>
11         <property name="connection.useUnicode">true</property>
12         <property name="connection.characterEncoding">UTF-8</property>

 

JNDI:

JNDI是Java 命名和目录接口(Java Naming and Directory Interface,JNDI)的简称.从一开始就一直是 JavaEE 企业的核心技术之一。在JMS,JMail,JDBC,EJB等技术中,就大量应用的这种技术。

  • 修改conf/server.xml文件,在GlobalNamingResources节点中添加

 1 <Resource name="jdbc/bookshop" auth="Container"
 2                 scope="jdbc/bookshop"
 3                 type="javax.sql.DataSource"
 4                 driverClassName="com.mysql.jdbc.Driver"
 5                 url="jdbc:mysql://192.168.1.2:3306/bookshop"
 6                 username="root"
 7                 password="lu123"
 8                 maxActive="50"
 9                 maxIdle="30"
10                 maxWait="10000" />

然后接着再修改conf/context.xml文件,在Context节点中添加引用,最后还需要重启一下tomcat服务

 

1 <ResourceLink 
2             global="jdbc/bookshop" 
3             name="jdbc/bookshop" 
4             auth="Container" 
5             type="javax.sql.DataSource"/>

然后再hibernate.cfg.xml配置文件中加入JNDI的配置即可

 1 <?xml version=\'1.0\' encoding=\'utf-8\'?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3     "-//Hibernate/Hibernate Configuration DTD//EN"
 4     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6   <session-factory>
 7     <!--<property name="connection.url">jdbc:mysql://192.168.1.2:3306/bookshop</property>-->
 8     <!--<property name="connection.driver_class">com.mysql.jdbc.Driver</property>-->
 9     <!--<property name="connection.username">root</property>-->
10     <!--<property name="connection.password">lu123</property>-->
11 
12     <!-- JNDI -->
13     <property name="connection.datasource">java:comp/env/jdbc/bookshop</property>
14 
15     <property name="hbm2ddl.auto">update</property>
16     <property name="show_sql">true</property>
17     <property name="format_sql">true</property>
18 
19     <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
20 
21     <property name="hibernate.current_session_context_class">thread</property>
22 
23 
24     <mapping resource="Users.hbm.xml"/>
25 
26   </session-factory>
27 </hibernate-configuration>

 

Proxool(推荐):

主配置文件:

1 <!-- proxool代理连接器 在hibernate.cfg.xml 加入 -->
2 <property name="hibernate.connection.provider_class">org.hibernate.proxool.internal.ProxoolConnectionProvider</property>
3 <property name="hibernate.proxool.pool_alias">DBPool</property>
4 <property name="hibernate.proxool.xml">proxoolconf.xml</property>

次要配置文件:

 1  <!--   新建 proxoolconf.xml      -->
 2  <?xml version="1.0" encoding="UTF-8"?>
 3 <!-- the proxool configuration can be embedded within your own application\'s. 
 4     Anything outside the "proxool" tag is ignored. -->
 5 <something-else-entirely>
 6     <proxool>
 7         <!--连接池的别名 -->
 8         <alias>DBPool</alias>
 9         <!-- proxool只能管理由自己产生的连接 -->
10         <driver-url>
11             jdbc:mysql://localhost:3306/hibernate?useUnicode=true&amp;characterEncoding=UTF8
12         </driver-url>
13         <!-- JDBC驱动程序 -->
14         <driver-class>com.mysql.jdbc.Driver</driver-class>
15         <driver-properties>
16             <property name="user" value="root" />
17             <property name="password" value="root" />
18         </driver-properties>
19         <!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 收,超时的销毁 -->
20         <house-keeping-sleep-time>90000</house-keeping-sleep-time>
21         <!-- 指因未有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 用户连接就不会被接受 -->
22         <maximum-new-connections>20</maximum-new-connections>
23         <!-- 最少保持的空闲连接数 -->
24         <prototype-count>5</prototype-count>
25         <!-- 允许最大连接数,超过了这个连接,再有请求时,就排在队列中等候,最大的 等待请求数由maximum-new-connections决定 -->
26         <maximum-connection-count>100</maximum-connection-count>
27         <!-- 最小连接数 -->
28         <minimum-connection-count>10</minimum-connection-count>
29     </proxool>
30 </something-else-entirely>      
31 
32 ```