Unity3D与PHP对MySQL执行增、删、改、查

借鉴https://blog.csdn.net/abcd5711664321/article/details/81012862

本来是被WebGL端链接数据库而苦恼，看到这篇帖子，很是激动，先看看。。。。。测试以后果然很棒，给博主点个赞

略有不足的是在Unity报错不明了，下面有解决办法，里面修改添加了一些内容，简单的使用应该是够了

addscore.php:

<?php
error_reporting(E_ALL ^ E_DEPRECATED);// 假定数据库用户名：root，密码：123456，数据库：test
$con=mysqli_connect("localhost","root","123456","test");
if (mysqli_connect_errno($con))
{echo "连接 MySQL 失败: " . mysqli_connect_error();
}
//增
if($_REQUEST['action']=="submit_highscore")
{$name = $_REQUEST['name'];$score = $_REQUEST['score'];$query = "INSERT INTO `tb1` (`userid`,`password`) VALUES ('$name','$score')";mysqli_query($con,$query);echo "Insert " . $name . " " . $score;
}//删，全部
if($_REQUEST['action']=="delete_all_highscore")
{$query = "DELETE FROM `tb1`";mysqli_query($con,$query);echo "Delete All!";
}//删，指定
if($_REQUEST['action']=="delete_highscore")
{$name = $_REQUEST['name'];$query = "DELETE FROM `tb1` WHERE `userid` = '$name'";mysqli_query($con,$query) or die(mysqli_error());echo "Delete " . $name;
}//改，指定
if($_REQUEST['action']=="update_highscore")
{$name = $_REQUEST['name'];$score = $_REQUEST['score'];$query = "UPDATE `tb1` SET `password` = '$score' WHERE `userid` = '$name'";mysqli_query($con,$query)    or die(mysqli_error());echo "Update " . $name . " " . $score;
}//查
if($_REQUEST['action']=="show_highscore")
{$query = "SELECT * FROM `tb1` ORDER BY `userid` DESC";$result = mysqli_query($con,$query);while($array = mysqli_fetch_array($result)){echo $array['userid']."</next>";echo $array['password']."</next>";}
}
//查寻一条数据
if($_REQUEST['action']=="show_highscore_One")
{$ID = $_REQUEST['ID'];$query = "SELECT * FROM `tb1` WHERE `userid` ='$ID'";$result = mysqli_query($con,$query);if (!$result) {printf("Error: %s\n", mysqli_error($con));exit();
}while($array = mysqli_fetch_array($result)){echo $array['userid']."</next>";echo $array['password']."</next>";echo $array['name']."</next>";}
}
?>

unity部分:

using System.Collections;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using UnityEngine;public class phpMySQL : MonoBehaviour
{string url = "http://localhost/WE/addscore.php";void Start(){//StartCoroutine(submit_highscore(100005, 123456));//StartCoroutine(delete_highscore("tom"));//StartCoroutine(delete_all_highscore());//StartCoroutine(update_highscore("tom", 233));//StartCoroutine(show_highscore());}private void Update(){if (Input.GetKeyDown(KeyCode.A)){//StartCoroutine(submit_highscore(100005, 123456));//StartCoroutine(delete_highscore(100005));//StartCoroutine(update_highscore(100001, 456789));StartCoroutine(show_highscore());}}//增IEnumerator submit_highscore(int player_name, int player_score){WWWForm form = new WWWForm();form.AddField("action", "submit_highscore");form.AddField("name", player_name);form.AddField("score", player_score);WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);}//删，全部IEnumerator delete_all_highscore(){WWWForm form = new WWWForm();form.AddField("action", "delete_highscore");WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);}//删，指定IEnumerator delete_highscore(int player_name){WWWForm form = new WWWForm();form.AddField("action", "delete_highscore");form.AddField("name", player_name);WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);}//改，指定IEnumerator update_highscore(int player_name, int player_score){WWWForm form = new WWWForm();form.AddField("action", "update_highscore");form.AddField("name", player_name);form.AddField("score", player_score);WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);}//查IEnumerator show_highscore(){WWWForm form = new WWWForm();form.AddField("action", "show_highscore");WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);var received_data = Regex.Split(www.text, "</next>");int scores = (received_data.Length - 1) / 2;for (int i = 0; i < scores; i++){print("Name: " + received_data[2 * i] + " Score: " + received_data[2 * i + 1]);}}//查寻其中一条数据IEnumerator show_highscore_One(int id){     WWWForm form = new WWWForm();form.AddField("action", "show_highscore_One");form.AddField("ID", id);WWW www = new WWW(url, form);yield return www;if (!string.IsNullOrEmpty(www.error)){Debug.Log(www.error);}Debug.Log(www.text);var received_data = Regex.Split(www.text, "</next>");int scores = (received_data.Length - 1) / 2;for (int i = 0; i < scores; i++){print("Name: " + received_data[2 * i] + " Score: " + received_data[2 * i + 1] + "Name:" + received_data[2 * i + 2]);GameObject.Find("Canvas/Text").transform.GetComponent<Text>().text = "Name: " + received_data[2 * i] + " Score: " + received_data[2 * i + 1] + "Name:" + received_data[2 * i + 2];}}
}

今天调取数据库数据时，一直报一个错：Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in E:\php

后来在网上找了一个很实用的解决方法：

只需要在php文件中写入这样几行代码,便可以“知错就改”了，这样是为了方便他报的错是什么意思

$result = mysqli_query($con,$sql);   if (!$result) {printf("Error: %s\n", mysqli_error($con));exit();
}

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