Java使用Jdbc连接Oracle执行简单查询操作示例

package com.test.dbtest;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**Jdbc 连接 Oracle 数据库 简单示例
 *@author wanggq
 *@version 创建时间：2014年3月31日 上午11:00:06
 *类说明
 */
public class TestO_procedure01 {
 public static void main(String[] args) {
 String driver = "oracle.jdbc.driver.OracleDriver";
 String url = "jdbc:Oracle:thin:@localhost:1521:orcl";
 Statement stmt = null;
 ResultSet res = null;
 Connection conn = null;
 CallableStatement proc = null;
 String sql = " select T.REC_NO, T.AIRLINE,T.DEPARTURE,T.ARRIVAL from CDP_MAIN_ORDER t where t.departure=upper('pek')";
 try {
  Class.forName(driver);
  conn = DriverManager.getConnection(url, "abc123", "abc123");
  stmt = conn.createStatement();
  res = stmt.executeQuery(sql);
  while(res.next())
  {
  String rec = res.getString("REC_NO");
  String airline = res.getString("AIRLINE");
  String dept = res.getString("DEPARTURE");
  String arr = res.getString("ARRIVAL");
  System.out.println(rec+" "+airline+" "+dept+" "+arr);
  }
 } catch (ClassNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 }
}

 PreparedStatement stmt = null;
 ResultSet res = null;
 Connection conn = null;
 CallableStatement proc = null;
 String sql = " select T.REC_NO, T.AIRLINE,T.DEPARTURE,T.ARRIVAL from CDP_MAIN_ORDER t where t.departure=upper(?)";
 try {
  Class.forName(driver);
  conn = DriverManager.getConnection(url, "abc123", "abc123");
  stmt = conn.prepareStatement(sql);
  stmt.setString(1, "pek");
  res = stmt.executeQuery();