服务端程序链接oracle数据库

最新推荐文章于 2025-12-01 08:35:04 发布

原创最新推荐文章于 2025-12-01 08:35:04 发布 · 427 阅读

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#数据库 #oracle

本文介绍了一个使用Java连接Oracle数据库的方法，并通过一个简单的例子展示了如何进行数据库查询操作。该示例采用单例模式实现数据库连接类，确保了连接资源的有效管理和利用。

首先创建一个数据库链接类：GetCon

package com.db;

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



public class GetCon {
    public static final String driver ="oracle.jdbc.driver.OracleDriver";//oracle驱动
    public static final String url ="jdbc:oracle:thin:@127.0.0.1:1521:orcl";//url地址
    public static final String userName ="wh6y";//用户名
    public static final String passWord ="r1";//密码




    private static Connection conn;//链接对象
    private static GetCon getCon = null;
    private GetCon() {

    }

    public static GetCon getInstance(){//单例模式
        if (getCon == null) {
            getCon = new GetCon();
        }
        return getCon;
    }
    static {
        try {
            Class.forName(driver);//可以了解一下为什么这么写有个链接http://blog.youkuaiyun.com/gaoqida/article/details/61920739?utm_source=itdadao&utm_medium=referral
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    private void initConnection(){
        try {
            conn = DriverManager.getConnection(url,userName,passWord);
            conn.setAutoCommit(true);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public Connection getCon(){
            initConnection();
        return conn;
    }

}

新建一个测试类Test2



public class Test2 {



    private static StringBuffer sb=new StringBuffer();

    public static void main(String[] args) {
        String sql="select * from pda_user t ";
         Connection con =GetCon.getInstance().getCon();
         try {
             PreparedStatement prepareStatement = con.prepareStatement(sql);
            ResultSet executeQuery = prepareStatement.executeQuery();
            while (executeQuery.next()) {
                 String dbuser = executeQuery.getString(1);
                    String user_id = executeQuery.getString(2);
                    String user_name = executeQuery.getString(3);

                    sb.append("dbuser:"+dbuser+" user_id："+user_id+" user_name："+user_name);
                    System.out.println("dbuser:"+dbuser+" user_id："+user_id+" user_name："+user_name);

            }



        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }



    }

}