Java数据库连接池c3p0过程解析

static ComboPooledDataSource cpd= new ComboPooledDataSource();
	 static {
		 try {
				cpd.setDriverClass("com.mysql.jdbc.Driver");
				cpd.setJdbcUrl("jdbc:mysql:///users?characterEnconding=utf-8");
				cpd.setUser("root");
				cpd.setPassword("123456");
			} catch (PropertyVetoException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} 
	 }

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

   <c3p0-config>


     <default-config>

         <property name="driverClass">com.mysql.jdbc.Driver </property>

         <property name="jdbcUrl">jdbc:mysql:///jt_db?characterEncoding=utf-8 
         </property>

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

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

   </default-config>

</c3p0-config>

//创建连接池对象
ComboPooledDataSource cpd= new ComboPooledDataSource();
  
  public void find() throws Exception {
  	//获取连接池连接
  	Connection conn = cpd.getConnection();
         //创建传输器
  	PreparedStatement ps = conn.prepareStatement("select * from user");
  	 
  	//结果集
  	ResultSet rs = ps.executeQuery();
  	
  	while(rs.next()) {
  		rs.getInt(1);//获取的行的第一列
  		rs.getString("id");//获取行的id列
  	}	
  }