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  • java 连接数据库

    package com.jdbc;
    
    import java.sql.*;
    public class JDBCDemo {
        public static void main(String[] args) throws ClassNotFoundException, SQLException {
            //1.注册驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.连接
            String url = "jdbc:mysql://localhost:3306/zfj";
            String username = "root";
            String password = "root";
            Connection con = DriverManager.getConnection(url,username,password);
            //3.语句执行对象 (执行sql) 返回值 Statement
            Statement stat = con.createStatement();
            //4.执行sql语句  executeLargeUpdate 用与mysql 中 insert update delete
            //int row = (int) stat.executeLargeUpdate("INSERT INTO user (id,user_name,user_age,user_sex) VALUES ('100','fj','20','1')");
    
    
            //查询 select
            String sql = "SELECT * FROM user";
            ResultSet rs = stat.executeQuery(sql);
            //处理结果集
            while (rs.next()){
                //获取每列的的数据
                System.out.println(rs.getString("id")+"  "+rs.getString("user_name")+"  "+rs.getString("user_age")+"  "+rs.getString("user_sex"));
            }
    
    
    
            //5.释放资源
            rs.close();
            stat.close();
            con.close();
        }
    }
    

      

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  • 原文地址:https://www.cnblogs.com/vinzen/p/10956739.html
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