package com.shsxt.jdbcs;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/*
 * jdbc步驟： java連接數(shù)據(jù)庫
 *  // 導(dǎo)入 jar包
 *   1、加載驅(qū)動(dòng)  數(shù)據(jù)庫廠商提供的實(shí)現(xiàn)類
 *   2、獲取連接  提供 url 用戶名 密碼
 *   3、創(chuàng)建處理塊  可以發(fā)送SQL語句到服務(wù)器（數(shù)據(jù)庫） 準(zhǔn)備一條 SQL語句
 *   4、結(jié)果集
 *   5、分析結(jié)果集
 *   6、釋放資源  先開的后放， 后打開的先放
 */
public class Demo002JDBCConnect {
  public static void main(String[] args) throws ClassNotFoundException {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    String user=  "scott";
    String pwd=  "tiger";
    Connection conn = null;
    Statement s = null;
    ResultSet rs = null;
    try {
      conn = DriverManager.getConnection(url, user, pwd);
      s = conn.createStatement();
      String sql = "select deptno, dname, loc from dept";
      rs = s.executeQuery(sql);
      while(rs.next()){
        int deptno = rs.getInt(1); // 根據(jù)列號(hào)來獲取值
        String dname = rs.getString("dname"); // 根據(jù)列名來獲取值
        String loc = rs.getString(3);
        System.out.println(deptno + "\t" + dname + "\t" + loc);
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }finally{
      if(rs!=null){
        try {
          rs.close();
        } catch (SQLException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
      if(s!=null){
        try {
          s.close();
        } catch (SQLException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
      if(conn!=null){
        try {
          conn.close();
        } catch (SQLException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    }
  }
}