sql里面ip地址转long型

可以通过MySQL内置的INET_ATON和INET_NTOA函数来实现IP地址和长整型之间的转换。

将IP地址转换为长整型：

SELECT INET_ATON('192.168.0.1');

将长整型转换为IP地址：

SELECT INET_NTOA(3232235521);

其中，3232235521是ip地址192.168.0.1转化为长整型的结果。

注意：在MySQL中，存储IP地址时可以使用int(10) UNSIGNED类型，用于存储转换后的长整型。

相关问题

光敏传感器通过ESP8266模块采集，运用SQL数据库

好的，我为您提供一个简单的代码示例，用于通过ESP8266模块采集光敏传感器数据，将其存储到MySQL数据库中，并通过Web页面展示数据。请注意，这只是一个基本示例，您可能需要根据具体情况进行修改。

1. 采集传感器数据并将其存储到MySQL数据库中

#include <ESP8266WiFi.h>
#include <MySQL_Connection.h>
#include <MySQL_Cursor.h>

// 定义WiFi信息
const char* ssid = "your_ssid";
const char* password = "your_password";

// 定义MySQL数据库信息
IPAddress server_addr(192,168,1,100);  // 替换为您的MySQL服务器IP地址
String user = "your_username";         // 替换为您的MySQL用户名
String password = "your_password";     // 替换为您的MySQL密码
String database = "your_database";     // 替换为您的数据库名称

// 定义光敏传感器引脚
const int sensor_pin = A0;

// 定义数据上传间隔时间（毫秒）
const unsigned long interval = 10000;

// 定义上次数据上传时间
unsigned long last_upload_time = 0;

// 定义WiFi客户端和MySQL客户端
WiFiClient client;
MySQL_Connection conn(&client);

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 连接WiFi网络
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  // 连接MySQL服务器
  Serial.print("Connecting to MySQL server...");
  if (conn.connect(server_addr, 3306, user, password)) {
    Serial.println("success");
  } else {
    Serial.println("failed");
    return;
  }

  // 选择数据库
  MySQL_Cursor* cursor = new MySQL_Cursor(&conn);
  cursor->execute("USE " + database);
  delete cursor;
}

void loop() {
  // 读取光敏传感器值
  int sensor_value = analogRead(sensor_pin);

  // 检查是否需要上传数据
  unsigned long current_time = millis();
  if (current_time - last_upload_time >= interval) {
    // 构建SQL INSERT语句
    String sql = "INSERT INTO sensor_data (value) VALUES (" + String(sensor_value) + ")";

    // 执行SQL INSERT语句
    MySQL_Cursor* cursor = new MySQL_Cursor(&conn);
    cursor->execute(sql);
    delete cursor;

    // 更新上次数据上传时间
    last_upload_time = current_time;
  }
}

2. 通过Web页面展示数据

您可以使用PHP和JavaScript来实现Web页面数据展示。以下是一个简单的PHP代码示例，用于从MySQL数据库中读取传感器数据，并通过Web页面展示数据。

<?php
// 定义MySQL数据库信息
$servername = "your_servername";   // 替换为您的MySQL服务器名称
$username = "your_username";       // 替换为您的MySQL用户名
$password = "your_password";       // 替换为您的MySQL密码
$database = "your_database";       // 替换为您的数据库名称

// 创建MySQL连接
$conn = new mysqli($servername, $username, $password, $database);

// 检查连接是否成功
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

// 从数据库中读取传感器数据
$sql = "SELECT * FROM sensor_data";
$result = $conn->query($sql);

// 构建数据表格
echo "<table>";
echo "<tr><th>ID</th><th>Value</th><th>Timestamp</th></tr>";
while($row = $result->fetch_assoc()) {
  echo "<tr>";
  echo "<td>" . $row["id"] . "</td>";
  echo "<td>" . $row["value"] . "</td>";
  echo "<td>" . $row["timestamp"] . "</td>";
  echo "</tr>";
}
echo "</table>";

// 关闭MySQL连接
$conn->close();
?>

您可以在Web页面上使用JavaScript定期刷新数据表格，以显示最新的传感器数据。

实现论坛管理，在mysql中创建论坛表，包含留言时间、留言IP地址、留言内容并且在servlet程序中实现发表留言、留言显示、删除留言

在mysql中创建论坛表的SQL语句：

CREATE TABLE forum (
    id INT AUTO_INCREMENT PRIMARY KEY,
    post_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    ip_address VARCHAR(15) NOT NULL,
    content TEXT NOT NULL
);

在servlet程序中实现发表留言、留言显示、删除留言的代码示例：

import java.io.IOException;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ForumServlet")
public class ForumServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private static final String DB_URL = "jdbc:mysql://localhost:3306/forumdb?useSSL=false&serverTimezone=UTC";
    private static final String DB_USER = "root";
    private static final String DB_PASS = "password";

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        if (action == null) {
            action = "list";
        }
        switch (action) {
            case "new":
                showNewForm(request, response);
                break;
            case "insert":
                insertPost(request, response);
                break;
            case "delete":
                deletePost(request, response);
                break;
            case "list":
            default:
                listPosts(request, response);
                break;
        }
    }

    private void listPosts(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Post> postList = new ArrayList<>();
        try (Connection conn = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
             PreparedStatement stmt = conn.prepareStatement("SELECT * FROM forum ORDER BY post_time DESC");
             ResultSet rs = stmt.executeQuery()) {
            while (rs.next()) {
                Post post = new Post();
                post.setId(rs.getInt("id"));
                post.setPostTime(rs.getTimestamp("post_time"));
                post.setIpAddress(rs.getString("ip_address"));
                post.setContent(rs.getString("content"));
                postList.add(post);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        request.setAttribute("postList", postList);
        request.getRequestDispatcher("forum.jsp").forward(request, response);
    }

    private void showNewForm(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("new_post.jsp").forward(request, response);
    }

    private void insertPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String ipAddress = request.getRemoteAddr();
        String content = request.getParameter("content");
        try (Connection conn = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
             PreparedStatement stmt = conn.prepareStatement("INSERT INTO forum (ip_address, content) VALUES (?, ?)")) {
            stmt.setString(1, ipAddress);
            stmt.setString(2, content);
            stmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        response.sendRedirect("ForumServlet?action=list");
    }

    private void deletePost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int id = Integer.parseInt(request.getParameter("id"));
        try (Connection conn = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
             PreparedStatement stmt = conn.prepareStatement("DELETE FROM forum WHERE id = ?")) {
            stmt.setInt(1, id);
            stmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        response.sendRedirect("ForumServlet?action=list");
    }
}

在jsp页面中显示论坛留言的代码示例：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Forum</title>
</head>
<body>
    <h1>Forum</h1>
    <a href="ForumServlet?action=new">New Post</a>
    <br><br>
    <table border="1">
        <tr>
            <th>ID</th>
            <th>Date/Time</th>
            <th>IP Address</th>
            <th>Content</th>
            <th>Action</th>
        </tr>
        <c:forEach items="${postList}" var="post">
            <tr>
                <td>${post.id}</td>
                <td>${post.postTime}</td>
                <td>${post.ipAddress}</td>
                <td>${post.content}</td>
                <td><a href="ForumServlet?action=delete&id=${post.id}">Delete</a></td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

在jsp页面中发表新留言的代码示例：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>New Post</title>
</head>
<body>
    <h1>New Post</h1>
    <form action="ForumServlet?action=insert" method="post">
        <textarea name="content" rows="10" cols="50"></textarea>
        <br>
        <input type="submit" value="Post">
    </form>
</body>
</html>