package com.tr.jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.commons.dbcp2.BasicDataSource;

public class CollectionFactory {

 private final static String dbDriver = "com.mysql.jdbc.Driver";
 private final static String dbUrl="jdbc:mysql://localhost:3306/xtest?useUnicode=true&characterEncoding=UTF-8" ;
 private final static String dbUser="root";
 private final static String dbpwd="root";

 private static BasicDataSource dataSource;
 //創(chuàng)建dbcp的簡單數(shù)據(jù)源并初始化相關(guān)屬性
 static{
  dataSource = new BasicDataSource();
  dataSource.setDriverClassName(dbDriver);
  dataSource.setUrl(dbUrl);
  dataSource.setUsername(dbUser);
  dataSource.setPassword(dbpwd);

  //指定數(shù)據(jù)庫連接池初始化連接數(shù)
  dataSource.setInitialSize(10);
  //設(shè)定同時(shí)向數(shù)據(jù)庫申請(qǐng)的最大連接數(shù)
  dataSource.setMaxTotal(50);
  //設(shè)置連接池中保持的最少連接數(shù)量
  dataSource.setMinIdle(5);
  //其他屬相...參考Apache的公開文檔
 }
 //創(chuàng)建數(shù)據(jù)庫連接對(duì)象--并且多線程并發(fā)處理(注意Connection導(dǎo)的是Java.sql的包)
 public static synchronized Connection creatConnection(){
  Connection conn = null;
  if(dataSource!=null&&!dataSource.isClosed()){
   try {
    conn = dataSource.getConnection();
   } catch (SQLException e) {

    e.printStackTrace();
   }
  }
  return conn;

 }

 public static void main(String[] args) {
  String sql = "select * from s_t_user";
  Connection conn = creatConnection();
  Statement statement = null;
  ResultSet resultSet = null;
  try {
   statement = conn.createStatement();
   resultSet= statement.executeQuery(sql);
   int row = 0;
   while(resultSet.next()){
    row++;
    System.out.println("記錄行"+row+"col2:"+resultSet.getString(2));
    }
  } catch (SQLException e) {
   e.printStackTrace();
  }finally {
   if (conn!=null) {
    try {
     conn.close();
    } catch (SQLException e) {  
     e.printStackTrace();
    }
   }
  }

 }

}