C3P0连接池配置

1.C3P0连接池在tomcat中的详细配置

一.在tomcat_home\common\lib下放入jdbc的驱动程序,额外说一下,如果是使用sql server的话,有至少两个驱动可以选择,一个是微软提供的,另一个是 jtds,比微软的要好很多
二.配置文件,tomcat 不同的版本配置文件略有不同,下面以tomcat5.5.*为例,如果配置不正确会出现javax.naming.NameNotFoundException: Name is not bound in this Context 错误

方式一、全局数据库连接池(Mysql数据库)
1、通过管理界面配置连接池,或者直接在tomcat\conf\server.xml的GlobalNamingResources中增加
<Resource auth="Container" description="DB Connection" driverClass="com.mysql.jdbc.Driver" maxPoolSize="10" minPoolSize="2"
acquireIncrement="2" name="jdbc/connPool" user="root" password="111111" factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource" jdbcUrl="jdbc:mysql://localhost:3306/haixu?autoReconnect=true" />
2、在tomcat\conf\context.xml的Context中增加:
<ResourceLink global="jdbc/mydb" name="jdbc/mydb" type="javax.sql.DataSource"/>

方式二、局部数据库连接池(mssql数据库)
只需在tomcat\webapps\myapps\META-INF\context.xml的Context中增加:
<Resource name="jdbc/mydb" type="javax.sql.DataSource" password="mypwd"
driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver" maxIdle="2" maxWait="5000" validati username="sa"
url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb" maxActive="4"/>
参数说明:
driveClassName:JDBC驱动类的完整的名称;
maxActive:同时能够从连接池中被分配的可用实例的最大数;
maxIdle:可以同时闲置在连接池中的连接的最大数;
maxWait:最大超时时间,以毫秒计;
password:用户密码;
url:到JDBC的URL连接;
user:用户名称;
validationQuery:用来查询池中空闲的连接。

具体配置步骤:
(1)有三个文件需要配置
1>\Tomcat 5.5\conf\server.xml
2>\Tomcat 5.5\conf\context.xml 
3>项目中\WebRoot\WEB-INF\web.xml
(2)配置的代码
1> 在tomcat\conf\server.xml的GlobalNamingResources中增加:
<Resource auth="Container"
     description="DB Connection"
     driverClass="com.mysql.jdbc.Driver"
     maxPoolSize="10"
     minPoolSize="2"
     acquireIncrement="2"
     name="jdbc/connPool"
     user="用户名"
     password="密码"
     factory="org.apache.naming.factory.BeanFactory"
     type="com.mchange.v2.c3p0.ComboPooledDataSource"
     jdbcUrl="jdbc:mysql://localhost:3306/数据库名?autoReconnect=true" />
2> 在tomcat\conf\context.xml的Context中增加: 
<ResourceLink name="jdbc/connPool" global="jdbc/connPool" type="javax.sql.DataSource"/>
3> 在web.xml中增加: 
   <resource-ref>
     <description>DB Connection</description>
     <res-ref-name>jdbc/connPool</res-ref-name>
     <res-type>javax.sql.DataSource</res-type>
     <res-auth>Container</res-auth>
   </resource-ref>
(3)jsp测试页面
<[email=%@page]%@page[/email] language="java" import="java.util.*,java.sql.*,javax.naming.*,javax.sql.*" pageEncoding="GB2312"%>
<[email=%@page]%@page[/email] import="com.mchange.v2.c3p0.*"%>
<[email=%@page]%@page[/email] import="java.sql.Connection"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
   <head>   
     <title>My JSP 'mysqlTest.jsp' starting page</title>
   </head>
 
   <body>
     Mysql数据库测试<br><br><br>
     <%
     Connection conn=null;
     try{
         InitialContext ctx = new InitialContext();
         DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/connPool");
         conn=ds.getConnection();
     }catch(NamingException ex){
         ex.printStackTrace();
     }

     String sql="select * from user";
     PreparedStatement ps=conn.prepareStatement(sql);
     ResultSet rs=ps.executeQuery();
     while(rs.next()){
     %>
         字段1:<%=rs.getString(1)%> 字段2:<%=rs.getString(2)%><br>
     <%
     }
     if(rs!=null){
         rs.close();
         rs=null;
     }
     if(ps!=null){
         ps.close();
         ps=null;
     }
     if(conn!=null){
         conn.close();
         conn=null;
     }
     %>
   </body>
</html>

2.C3P0在spring中的配置

<!-- com.mchange.v2.c3p0.ComboPooledDataSource   -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
     <property name="driverClass"   value="oracle.jdbc.driver.OracleDriver">
     </property>
     <property name="jdbcUrl"   value="jdbc:oracle:thin:@127.0.0.1:1521:db">
     </property>
     <property name="user" value="123"></property>
     <property name="password" value="123"></property>
     <property name="minPoolSize"><value>1</value></property>//最小链接数
     <property name="maxPoolSize"><value>20</value></property>//最大连接数
     <property name="maxIdleTime"><value>1800</value></property>//最大闲置时间
     <property name="acquireIncrement"><value>2</value></property>//达到最大连接数后可以增加的连接数
     <property name="maxStatements"><value>0</value></property>//
     <property name="initialPoolSize"><value>2</value></property>初始链接数
     <property name="idleConnectionTestPeriod"><value>1800</value></property>
     <property name="acquireRetryAttempts"><value>30</value></property>
     <property name="breakAfterAcquireFailure"><value>true</value></property>
     <property name="testConnectionOnCheckout"><value>false</value></property>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
     <property name="dataSource">
         <ref bean="dataSource" />
     </property>
     <property name="hibernateProperties">
         <props>
         <prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
         <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.generate_statistics">true</prop>
         <prop key="hibernate.connection.release_mode">auto</prop>
         <prop key="hibernate.autoReconnect">true</prop>
         <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
         <!-- 
         <prop key="hibernate.c3p0.min_size">5</prop>
         <prop key="hibernate.c3p0.max_size">20</prop>
         <prop key="hibernate.c3p0.timeout">1800</prop>
         <prop key="hibernate.c3p0.max_statements">50</prop>   
         <prop key="hibernate.show_sql">false</prop>
         -->
         </props>
     </property>
     <property name="mappingResources">
     <list>
         <value>com/src/A.hbm.xml</value>
         <value>com/src/B.hbm.xml</value>
     </list>
     </property>
</bean>

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