1.Hibernate默认连接池 6A
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<!DOCTYPE hibernate-configuration w*9br SK
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 75T_Dx(H
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<property name="connection.useUnicode">true</property> /hrT
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<property name="connection.characterEncoding">UTF-8</property> $q?$]k|M`
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<!--连接的登录名--> %.v{N6
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<property name="connection.username">root</property> 85:NFa@J
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<property name="connection.password"></property> }T^cEfX
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<!--是否将运行期生成的SQL输出到日志以供调试--> 7tM9u5FF
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<property name="show_sql">true</property> g>0XxjP4
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> -~[9U,
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<!--映射Student这个资源-->
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> #o/H~Iv
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2.C3P0连接配置 mffn//QS
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jdbc:mysql://localhost:3306/schoolproject 5(W"-A}
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<property name="connection.useUnicode">true</property> ""Zp:8o
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<property name="hibernate.c3p0.max_size">20</property> fP3_d
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<property name="hibernate.c3p0.timeout">120</property> GV)<Q^9
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<property name="hibernate.c3p0.max_statements">100</property> OA:%lC!
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<property name="hibernate.c3p0.idle_test_period">120</property> O8|5KpXd@
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<property name="hibernate.c3p0.acquire_increment">2</property> hS[yNwD
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<!--指定连接的语言--> TI9UXa:V\
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3.proxool连接池 bs9aE<j
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(1) 先写proxool的配置文件,文件名:proxool.xml(一般放在与hibernate.cfg.xml文件在同一个目录中)本例配置的是MYSQL数据库,数据库的名字为schoolproject =%zLh<3v
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 %4\OPw&
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<driver-class>com.mysql.jdbc.Driver</driver-class> Le"oAA#[
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<!-- 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 _LwOOZj
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用户连接就不会被接受--> ?^:h\C^a"
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<maximum-new-connections>20</maximum-new-connections> K
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<prototype-count>5</prototype-count> g+-;J+X8
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<!-- 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 #k3t3az2{
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<maximum-connection-count>100</maximum-connection-count> /ug8]Lo0
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(2)配置hibernate.cfg.xml文件 D71;&G]0
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<property name="hibernate.proxool.pool_alias">DBPool</property> 9>/wUQs!]
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类,这里Proxool连接池是用这个,不同的连接池有不同的加载类,可以查阅Hibernate文档获取相关信息 Z: 2I/
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 /Tz85 [%6
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(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置,可以用相对或绝对路径,用相对路径时要注意一定在要Path范围内!不然会抛出异常。 \(I6_a_{
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(4) dialect是声明SQL语句的方言 fYebB7Pv
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(5) show_sql定义是否显示Hibernate生成的SQL语言,一般在调试阶段设为true,完成后再改成false,这样有利于调试。 UVf\2\ Y
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(6) <mapping >资源文件映射 jW*1E*"
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4. JNDI连接池,数据源已经由应用服务配置好(如Web服务器),Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源,它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件,如: G,&%VQ3P>
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 zIQzmvf
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory "cho }X
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hibernate.transaction.manager_loopup_class = F-n"^.7
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hibernate.dialect=org.hibernate.dialect.MySQLDialect ]/]ju$l9Z