<?xml version="1.0" encoding="UTF-8"?>



   
 com.mysql.jdbc.Driver 
 jdbc:mysql:localhost:3306/jdbc_01
 root  
 root 
 
  
  5
  
  10
  
  5
  
  100
  
  2 
  
  5
 

package cn.qhy.jdbc;

import java.io.IOException;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class MyDBUtils {
 private static DataSource dataSource;
 static {// 静态代码块,只执行一次
 dataSource = new ComboPooledDataSource("MySQL");
 }

 /**
 * 
 * @return
 * @throws SQLException
 */
 public static Connection getConnection() throws SQLException {
 return dataSource.getConnection();
 }

 /**
 * 通用的用来关闭数据有关的所有的资源的操作
 */
 public static void close(Connection conn, Statement sta, ResultSet re) {
 if (re != null)
  try {
  re.close();
  } catch (SQLException e) {
  e.printStackTrace();
  }
 if (sta != null)
  try {
  sta.close();
  } catch (SQLException e) {
  e.printStackTrace();
  }
 if (conn != null)
  try {
  conn.close();
  } catch (SQLException e) {
  e.printStackTrace();
  }
 }
}

package cn.qhy.test;

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;

import org.junit.jupiter.api.Test;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import cn.qhy.jdbc.MyDBUtils;

public class C3P0Test {
 /**
 * @throws SQLException
 * 
 */
 @Test
 public void c3p0xmlTest() throws SQLException {
 Connection conn = MyDBUtils.getConnection();
 System.out.println(conn);
 conn.close();
 }
}