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<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             version="2.0">
    <persistence-unit name="bigdog" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
            <property name="hibernate.hbm2ddl.auto" value="update"/>

            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<!--            

please put :myconf.properties in your classpath,and give those three variables into the file as three lines


            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://db.hadoopz.com:3306/bigdog?useUnicode=true&amp;characterEncoding=UTF-8"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="ddos"/>
            
            
            
            
            
-->
            <property name="hibernate.cache.use_query_cache" value="false"/>
            <property name="hibernate.cache.use_second_level_cache" value="true"/>
            <property name="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/>            
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/>
            <!-- 最小连接数 -->
            <property name="c3p0.min_size" value="5"/>
            <!-- 最大连接数 -->
            <property name="c3p0.max_size" value="30"/>
            <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->
            <property name="c3p0.maxIdleTime" value="60"/>
            <!-- 获得连接的超时时间,如果超过这个时间,会抛出异常，单位毫秒 -->
            <property name="c3p0.timeout" value="1800"/>
            <!-- 最大的PreparedStatement的数量 -->
            <property name="c3p0.max_statements" value="50"/>
            <!-- 每隔120秒检查连接池里的空闲连接 ，单位是秒-->
            <property name="c3p0.idle_test_period" value="120"/>
            <!-- 当连接池里面的连接用完的时候，C3P0一下获取的新的连接数 -->
            <property name="c3p0.acquire_increment" value="1"/>
            <!-- 是否每次都验证连接是否可用 -->
            <property name="c3p0.validate" value="false"/>
        </properties>
    </persistence-unit>
</persistence>