Java如果通过jdbc操作连接oracle数据库

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JDBCTest01 {
 public static void main(String[] args) {
 Connection con=null;
 PreparedStatement prs=null;
 ResultSet rs=null;
 try {
  //步骤1、加载oracle驱动程序
  Class.forName("oracle.jdbc.OracleDriver");
  String url="jdbc:oracle:thin:@10.125.4.55:1521:orcl";
  String user="zhangjunbo";
  String password="zjb123";
  String sql="select * from student where xuehao='2'";
  try {
  //步骤2、获取连接 
  con=DriverManager.getConnection(url, user, password);
  System.out.println(con);
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  try {
  //步骤3、实例化预编译语句
  prs=con.prepareStatement(sql);
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  //步骤4、执行查询
  try {
  rs=prs.executeQuery(sql);
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  
  
 } catch (ClassNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 try {
  //步骤5、处理查询结果集
  while(rs.next()){
  System.out.println("姓名:"+rs.getString("xingming")+"\n"+"生日:"+rs.getString("birthday"));
  }
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }finally{
  //逐一将上面的几个对象关闭，不关闭的话会影响性能、并且占用资源
  //注意关闭的顺序，最后使用的最先关闭
  try {
  rs.close();
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  try {
  prs.close();
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  try {
  con.close();
  } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
 }
 }
}

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;

public class JDBCTest02 {
 public static void main(String[] args) throws ClassNotFoundException, SQLException {
 //创建输入流
 FileReader fReader=null;
 try {
  fReader=new FileReader("src/JDBC/db.properties");
 } catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 //创建map集合对象
 Properties properties=new Properties();
 //加载（将输入流中的资源加载到属性类对象中） 
 try {
  properties.load(fReader);
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 String driver=properties.getProperty("driver");
 String url=properties.getProperty("url");
 String username=properties.getProperty("username");
 String password=properties.getProperty("password");
 Class.forName(driver);
 Connection connection=DriverManager.getConnection(url, username, password);
 //对student表进行修改操作
 String sql="update student set xingming=? where xuehao=?";
 PreparedStatement pre=connection.prepareStatement(sql);
 pre.setString(1,"纷纷");
 pre.setString(2, "3");
 String sqlInsert="insert into student values(20,'寂静','男','','12000',3,20,21)";
 PreparedStatement pre2=connection.prepareStatement(sqlInsert);
 int insertInt=pre2.executeUpdate();
 int updateInt=pre.executeUpdate();
 System.out.println(updateInt+insertInt);
 pre.close();
 connection.close();
 }
}