c3p0配置介绍

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继上一篇介绍dbcp的配置，本文重点介绍下c3p0的配置及实例演示。

上一篇DBCP的配置可以参见：http://sjsky.iteye.com/blog/1105674

proxool的配置介绍也已经发表：http://sjsky.iteye.com/blog/1108808

本文的目录结构大致如下 ：
一、参数介绍
二、结合spring、hibernate中的配置示例
[ 一 ]、参数介绍

Xml代码  收藏代码
 
     
 
    3 
 
     
 
    30 
 
     
 
    1000 
 
     
 
    false 
 
     
    Test 
 
     
    　　 
    false 
 
     
    　　 
    100 
 
     
    　　 
     
 
     
    null 
     
    false 
    　　 
     
 
    60 
    　　 
     
    　　 
    3 
    　　 
     
    　　 
    60 
    　　 
     
    　　 
    15 
    　　 
     
    　　 
    100 
    　　 
     
    　　 
     
    　　 
     
    　　 
    3 
    　　 
     
    　　 
    root 
 
     
    　　 
    password 
    　　 
    　　 
     
    　　 
     
    　　 
     
        select id from tb_c3p0_test where id=1 
     
    　　 
     
    　　 
    300 
    　　 
     
    　　 
    false 
     
    　　 
    true 
     
    root 
     
     
 
 

和hibernate配置属性的对照表：

c3p0-native property name hibernate configuration key
c3p0.acquireIncrement hibernate.c3p0.acquire_increment
c3p0.idleConnectionTestPeriod hibernate.c3p0.idle_test_period
c3p0.initialPoolSize not available -- uses minimum size
c3p0.maxIdleTime hibernate.c3p0.timeout
c3p0.maxPoolSize hibernate.c3p0.max_size
c3p0.maxStatements hibernate.c3p0.max_statements
c3p0.minPoolSize hibernate.c3p0.min_size
c3p0.testConnectionsOnCheckout
hibernate.c3p0.validate hibernate 2.x only!


[ 二 ]、spring、hibernate中的配置示例

c3p0.jdbc.properties
Java代码  收藏代码
jdbc.driverClassName=com.mysql.jdbc.Driver   
jdbc.url=jdbc:mysql://localhost/iecms   
jdbc.username=root   
jdbc.password=   

[ 1 ]、基础测试

Java代码  收藏代码
package michael.jdbc.c3p0; 
 
import java.sql.Connection; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
import java.util.Properties; 
 
import javax.sql.DataSource; 
 
import michael.jdbc.dbcp.DbcpDataSourceExample; 
 
import com.mchange.v2.c3p0.ComboPooledDataSource; 
 
/**
* @see http://sjsky.iteye.com
* @author michael [email protected]
*/ 
public class C3p0DataSourceExample { 
 
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
 
        String testSql = "select * from TB_MYTEST"; 
        String cfgFileName = "c3p0.jdbc.properties"; 
 
        System.out.println("init c3p0 ComboPooledDataSource start "); 
        DataSource dataSource = initDataSource(cfgFileName); 
        System.out.println("ComboPooledDataSource init done."); 
 
        Connection conn = null; 
        Statement stmt = null; 
        ResultSet rset = null; 
 
        try { 
            System.out.println("Creating connection start."); 
            conn = dataSource.getConnection(); 
 
            System.out.println("Creating statement start."); 
            stmt = conn.createStatement(); 
 
            System.out.println("Executing statement start."); 
            rset = stmt.executeQuery(testSql); 
 
            System.out.println("executeQuery Results:"); 
            int numcols = rset.getMetaData().getColumnCount(); 
 
            while (rset.next()) { 
                for (int i = 1; i <= numcols; i++) { 
                    System.out.print("\t" + rset.getString(i)); 
                } 
                System.out.println(""); 
            } 
            System.out.println("Results display done."); 
        } catch (SQLException e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (rset != null) 
                    rset.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            try { 
                if (stmt != null) 
                    stmt.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            try { 
                if (conn != null) 
                    conn.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
 
        } 
    } 
 
    /**
     * @param cfgFileName
     * @return DataSource
     */ 
    public static DataSource initDataSource(String cfgFileName) { 
        ComboPooledDataSource ds = new ComboPooledDataSource(); 
        try { 
            Properties cfgpp = new Properties(); 
            cfgpp.load(C3p0DataSourceExample.class 
                    .getResourceAsStream(cfgFileName)); 
            ds.setDriverClass(cfgpp.getProperty("jdbc.driverClassName")); 
            ds.setJdbcUrl(cfgpp.getProperty("jdbc.url")); 
            ds.setUser(cfgpp.getProperty("jdbc.username")); 
            ds.setPassword(cfgpp.getProperty("jdbc.password")); 
        } catch (Exception e) { 
            e.printStackTrace(); 
            return null; 
        } 
 
        return ds; 
    } 
 
} 

运行结果
init c3p0 ComboPooledDataSource start
ComboPooledDataSource init done.
Creating connection start.
Creating statement start.
Executing statement start.
executeQuery Results:
1 batch_add_0 2011-06-16 14:29:08.0
2 batch_add_1 2011-06-16 14:29:08.0
3 batch_add_2 2011-06-16 14:29:08.0
4 batch_add_3 2011-06-16 14:29:08.0
5 batch_add_4 2011-06-16 14:29:08.0
Results display done.

[ 2 ]、结合spring的配置测试

c3p0.ds.spring.xml
Xml代码  收藏代码
 
 
 
            class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
         
             
                 
                    classpath:michael/jdbc/c3p0/c3p0.jdbc.properties 
                 
             
         
     
 
            class="com.mchange.v2.c3p0.ComboPooledDataSource" 
        destroy-method="close"> 
         
         
         
         
 
         
         
         
         
         
         
         
         
         
         
     
 
 

Java代码  收藏代码
package michael.jdbc.c3p0; 
 
import java.sql.Connection; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
 
import javax.sql.DataSource; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
import com.mchange.v2.c3p0.ComboPooledDataSource; 
 
/**
* @see http://sjsky.iteye.com
* @author michael [email protected]
*/ 
public class C3p0SpringExample { 
 
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
 
        System.out.println("c3p0.ds.spring.xml init start "); 
        ApplicationContext appCt = new ClassPathXmlApplicationContext( 
                "michael/jdbc/c3p0/c3p0.ds.spring.xml"); 
 
        System.out.println("spring bean create ComboPooledDataSource"); 
        DataSource dataSource = (ComboPooledDataSource) appCt 
                .getBean("c3p0DataSource"); 
 
        String testSql = "select * from TB_MYTEST"; 
 
        Connection conn = null; 
        Statement stmt = null; 
        ResultSet rset = null; 
 
        try { 
            System.out.println("Creating connection start."); 
            conn = dataSource.getConnection(); 
 
            System.out.println("Creating statement start."); 
            stmt = conn.createStatement(); 
 
            System.out.println("Executing statement start."); 
            rset = stmt.executeQuery(testSql); 
 
            System.out.println("executeQuery Results:"); 
            int numcols = rset.getMetaData().getColumnCount(); 
 
            while (rset.next()) { 
                for (int i = 1; i <= numcols; i++) { 
                    System.out.print("\t" + rset.getString(i)); 
                } 
                System.out.println(""); 
            } 
            System.out.println("Results display done."); 
        } catch (SQLException e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (rset != null) 
                    rset.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            try { 
                if (stmt != null) 
                    stmt.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            try { 
                if (conn != null) 
                    conn.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
 
        } 
 
    } 
} 

运行结果：
c3p0.ds.spring.xml init start
spring bean create ComboPooledDataSource
Creating connection start.
Creating statement start.
Executing statement start.
executeQuery Results:
1 batch_add_0 2011-06-16 14:29:08.0
2 batch_add_1 2011-06-16 14:29:08.0
3 batch_add_2 2011-06-16 14:29:08.0
4 batch_add_3 2011-06-16 14:29:08.0
5 batch_add_4 2011-06-16 14:29:08.0
Results display done.


[ 3 ]、结合hibernate的配置测试

hibernate.cfg.xm
Xml代码  收藏代码
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
 
 
 
     
         
            com.mysql.jdbc.Driver 
         
 
         
         
            jdbc:mysql://localhost:3306/iecms 
         
 
        true 
        UTF-8 
 
         
        root 
 
         
         
 
         
         
            org.hibernate.connection.C3P0ConnectionProvider 
         
         
        20 
         
        5 
         
        120 
         
        100 
         
        120 
         
        2 
         
        true 
 
        true 
 
        thread 
 
         
            org.hibernate.dialect.MySQL5Dialect 
         
 
        update 
     
 

Java代码  收藏代码
package michael.jdbc.c3p0; 
 
import java.util.List; 
 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.AnnotationConfiguration; 
import org.hibernate.cfg.Configuration; 
 
/**
* @see http://sjsky.iteye.com
* @author michael [email protected]
*/ 
public class C3p0HibernateExample { 
 
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
        SessionFactory sessionFactory = null; 
        try { 
            System.out.println("c3p0/hibernate.cfg.xml configure"); 
            Configuration config = new AnnotationConfiguration() 
                    .configure("michael/jdbc/c3p0/hibernate.cfg.xml"); 
 
            System.out.println(" create sessionFactory "); 
            sessionFactory = config.buildSessionFactory(); 
 
            System.out.println(" create session "); 
            Session session = sessionFactory.getCurrentSession(); 
            String testSql = "select * from TB_MYTEST"; 
 
            System.out.println(" beginTransaction "); 
            Transaction ta = session.beginTransaction(); 
            org.hibernate.Query query = session.createSQLQuery(testSql); 
            List list = query.list(); 
            System.out.println(" createSQLQuery list: "); 
            for (Object[] objArr : list) { 
                for (Object obj : objArr) { 
                    System.out.print("\t" + obj); 
                } 
                System.out.println(""); 
            } 
            System.out.println(" beginTransaction commit "); 
            ta.commit(); 
 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } finally { 
            if (null != sessionFactory) { 
                sessionFactory.close(); 
            } 
 
        } 
 
    } 
} 
运行结果：
c3p0/hibernate.cfg.xml configure
create sessionFactory
create session
beginTransaction
Hibernate: select * from TB_MYTEST
createSQLQuery list:
1 batch_add_0 2011-06-16 14:29:08.0
2 batch_add_1 2011-06-16 14:29:08.0
3 batch_add_2 2011-06-16 14:29:08.0
4 batch_add_3 2011-06-16 14:29:08.0
5 batch_add_4 2011-06-16 14:29:08.0
beginTransaction commit

转载请注明来自：Michael's blog @ http://sjsky.iteye.com