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应用介绍

收集了最新版本的C3p0 jar包下载、，C3P0是一个开源的JDBC连接池、，它实现了数据源和JNDI绑定，支持JDBC3规范和JDBC2的标准扩展、。目前使用它的开源项目有Hibernate、，Spring等。有需要的编程人员不妨下载、！

区别介绍

c3p0与dbcp区别

dbcp没有自动回收空闲连接的功能c3p0有自动回收空闲连接功能

C3P0连接池配置

一、、配置<c3p0-config>
<default-config>

<property name="acquireIncrement">3</property>


<property name="acquireRetryAttempts">30</property>


<property name="acquireRetryDelay">1000</property>


<property name="autoCommitOnClose">false</property>


<property name="automaticTestTable">Test</property>


<property name="breakAfterAcquireFailure">false</property>


<property name="checkoutTimeout">100</property>


<property name="connectionTesterClassName"></property>


<property name="factoryClassLocation">null</property>


<property name="forceIgnoreUnresolvedTransactions">false</property>


<property name="idleConnectionTestPeriod">60</property>


<property name="initialPoolSize">3</property>


<property name="maxIdleTime">60</property>


<property name="maxPoolSize">15</property>


<property name="maxStatements">100</property>


<property name="maxStatementsPerConnection"></property>


<property name="numHelperThreads">3</property>


<property name="overrideDefaultUser">root</property>


<property name="overrideDefaultPassword">password</property>


<property name="password"></property>


<property name="preferredTestQuery">select id from test where id=1</property>


<property name="propertyCycle">300</property>


<property name="testConnectionOnCheckout">false</property>


<property name="testConnectionOnCheckin">true</property>


<property name="user">root</property>


<property name="usesTraditionalReflectiveProxies">false</property>

<property name="automaticTestTable">con_test</property>
<property name="checkoutTimeout">30000</property>
<property name="idleConnectionTestPeriod">30</property>
<property name="initialPoolSize">10</property>
<property name="maxIdleTime">30</property>
<property name="maxPoolSize">25</property>
<property name="minPoolSize">10</property>
<property name="maxStatements">0</property>
<user-overrides user="swaldman">
</user-overrides>
</default-config>
<named-config name="dumbTestConfig">
<property name="maxStatements">200</property>
<user-overrides user="poop">
<property name="maxStatements">300</property>
</user-overrides>
</named-config>
</c3p0-config>

二|、实现

c3p0的实现全局使用c3p0
1. server.xml中GlobalNamingResources<Resource auth="Container"description="DB Connection"driverClass="org.gjt.mm.mysql.Driver"maxPoolSize="10"minPoolSize="2"acquireIncrement="2"name="jdbc/mysql1"user="root"password="xxxxxx"factory="org.apache.naming.factory.BeanFactory"type="com.mchange.v2.c3p0.ComboPooledDataSource"jdbcUrl="jdbc:mysql://localhost:3306/noticemanager?characterEncoding=UTF-8&useUnicode=TRUE&autoReconnect=true" />2. context.xml中ResourceLink<ResourceLink name="jdbc/mysql1" global="jdbc/mysql1" type="javax.sql.DataSource"/>3. web.xml<resource-ref><description>Tomcat Datasource</description><res-ref-name>jdbc/mysql1</res-ref-name><res-type>javax.sql.DataSource</res-type><res-auth>Container</res-auth></resource-ref>4.Hibernate中的配置<?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="c3p0.min_size">5</property><property name="c3p0.max_size">100</property><property name="c3p0.time_out">1800</property><property name="c3p0.max_statement">100</property><property name="dialect">org.hibernate.dialect.MySQLDialect</property><property name="jndi.url">jdbc:mysql://localhost:3306/noticemanager</property><property name="connection.datasource">java:comp/env/jdbc/mysql1</property><property name="connection.username">root</property><property name="connection.password">xxxxxxxxx</property><property name="hibernate.show_sql">true</property><mapping resource="com/dpoo/pojo/Notice.hbm.xml" /></session-factory></hibernate-configuration>JDBC实现：与DateSource相同

try {
Context ctx = new InitialContext();
ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mysql1");
conn = ds.getConnection();
} catch (NamingException e) {
e.printStackTrace();
return null;

} catch (SQLException e) {
e.printStackTrace();
return null;
}