我剛剛接到Hosting公司的電話,他們聲稱我的應用程序創建了超過400個連接到mysql數據庫並導致他們的dbms崩潰了一些! 我使用Hibernate和C3P0作爲連接池,這裏是我的Hibernate配置文件,c3p0創建瞭如此多的連接
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost/music?characterEncoding=UTF-8
</property>
<property name="connection.username">USER</property>
<property name="connection.password">PASS</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hbm2ddl.auto">update</property>
<property name="hibernate.max_fetch_depth">3</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.acquire_increment">2</property>
<property name="hibernate.c3p0.idle_test_period">300</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.max_size">25</property>
<property name="hibernate.c3p0.min_size" >3</property>
<property name="hibernate.c3p0.max_statement">0</property>
<property name="hibernate.c3p0.preferredTestQuery">select 1;</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.validate">true</property>
<mapping resource="com/roodakimusic/hibernate/resources/Article.hbm.xml"/>
<mapping resource="com/roodakimusic/hibernate/resources/News.hbm.xml"/>
<mapping resource="com/roodakimusic/hibernate/resources/Admin.hbm.xml"/>
<mapping resource="com/roodakimusic/hibernate/resources/Maestro.hbm.xml"/>
<mapping resource="com/roodakimusic/hibernate/resources/Roodaki.hbm.xml"/>
<mapping resource="com/roodakimusic/hibernate/resources/Photo.hbm.xml"/>
</session-factory>
</hibernate-configuration>
和MySQL和應用程序之間的任何對話都是這樣
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
//session.doSomething
session.getTransaction().commit();
有什麼不對嗎? :D --edit - 有人說它可能是一個jdbc連接器版本。
您的c3p0配置如何? – DerMike
c3p0配置在hibernate配置裏面。不是嗎? – MoienGK
http://stackoverflow.com/questions/3768263/how-can-i-prevent-hibernate-c3p0-mysql-creating-large-numbers-of-sleeping-co?rq=1 – rkosegi