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How to connect to database from Unity
(3 answers)
Closed 5 years ago.
I'm looking around for the easiest solution of how to connect to mysql database and for example, retrieve and update data. I've tried doing my research, but I couldn't find anything really. I mean, I would bet there's a simple way. I've worked with PHP before and I would think that its relatively easy to connect to database using C#.
Can anybody please show me a sample code of how to connect to mysql database? Also, how to retrieve and update data? Please and thank you!
I don't know what you mean by easy, but I've used www form.
Followed this tutorial series from youtube to begin.
In short; you will create www forms and send required data to php code. With the answer from php code you can do your tasks. I will try to provide an example.
Unity C# Login Script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
public class LoginScript : MonoBehaviour {
public GameObject inputUsernameText;
public GameObject inputPasswordText;
public string inputUsername;
public string inputPassword;
public string userUsername;
public string userPassword;
public string[] userDataArray;
string loginURL ="YOUR LOGIN PHP CODE URL HERE" ;
public bool isLoginButtonPressed;
void Awake() {
DontDestroyOnLoad(transform.gameObject);
}
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
if (isLoginButtonPressed)
{
StartCoroutine(loginToDB (inputUsername, inputPassword));
isLoginButtonPressed = false;
}
}
IEnumerator loginToDB(string username, string password)
{
WWWForm form = new WWWForm();
form.AddField("usernamePost", username);
form.AddField("passwordPost", password);
WWW www = new WWW (loginURL, form);
yield return www;
//Debug.Log (www.text);
userDataArray = userEkipIDString.Split ('|');
userUsername = userDataArray [0];
userPassword = userDataArray [1];
isLoginButtonPressed = false;
SceneManager.LoadScene("MainMenuScene", LoadSceneMode.Single);
}
public void loginButtonPressedFunc()
{
inputUsername = inputUsernameText.GetComponent<Text> ().text.ToString ();
inputPassword = inputPasswordText.GetComponent<Text> ().text.ToString ();
isLoginButtonPressed = true;
}
}
What this script does is, it get a username and password from Unity's input field and send it to php code. If username and password is correct it loads another scene.
PHP Code
<?php
$servername = "YOUR HOST NAME ex:localhost";
$username = "YOUR DB USER NAME";
$password = "YOUR DB PASSWORD";
$dbName = "YOUR DB NAME";
$user_username = $_POST["usernamePost"];
$user_password = $_POST["passwordPost"];
//Make Connection
$conn = mysqli_connect($servername,$username,$password,$dbName);
//Check Connection
if(!$conn)
{
die("Connection Failed. " . mysqli_connect_error());
}
//else echo ("Connection Success.");
$sql ="Select user, pass from "YOUR TABLE NAME" where user = '".$user_username."' "; //You can write your own query here
$result = mysqli_query($conn,$sql);
//Get the result and confirm login
if(mysqli_num_rows($result)>0)
{
//show data for each row
while($row = mysqli_fetch_assoc($result))
{
if($row['pass'] == $user_password)
{
//echo "Login Success";
echo "".$row['user']."|".$row['pass']."" ;
}
else
{
echo "Wrong Password";
}
}
}
else
{
echo "User not found";
}
?>
You can adjust this logic to insert, update and delete
Hope this helps. Cheers!
Related
I need some guide in data format/syntax with php.
I have a simple form in my app, so user should fill the form and submit, Am successfully uploading my text file to my server, but need some good format.
Here is my code
[Header("Input Fields")]
public InputField userName;
public InputField mobileNo;
public InputField coinsToRedeem;
[Header("Data Strings")]
public string usernameText;
public string mobileNoText ;
public string coinsText;
public void GetSetData()
{
usernameText = userName.text;
mobileNoText = mobileNo.text;
coinsText = coinsToRedeem.text;
StartCoroutine(UpLoadUserData());
}
IEnumerator UpLoadUserData()
{
WWWForm form = new WWWForm();
form.AddField("name", usernameText);
form.AddField("data", mobileNoText +","+ coinsText);
UnityWebRequest www = UnityWebRequest.Post("https://myserver/UserData.php", form);
yield return www.SendWebRequest();
if (www.isNetworkError)
Debug.Log(www.error);
else
Debug.Log("Uploaded");
}
PHP CODE
<?php
if(isset($_POST['name']) && isset($_POST['data'])){
file_put_contents($_POST['name'].".txt", $_POST['data']);
echo "uploaded.";
}else{
echo "invalid file uploaded.";
}
?>
So now the data text file is uploading, and in the text i got the data like this format
"Mobile Number, Number of coins"
But i need below format
"Mobile Number
number of coins"
So, how can i write like this? Or how to add more fields?
thanks.
form.AddField("data", mobileNoText +","+ coinsText);
this is where you format your data as "Mobile Number, Number of coins"
if you change it to something like
form.AddField("data", mobileNoText + coinsText);
it will write Mobile Number number of coins.
Building a Unity front-end app that communicates with a PHP/MySQL back-end. Right now I am working on the register and login portions of it. In the Unity editor, all works perfectly, on the browser front end registration is working fine as well. But as soon as I take the working build in Unity and build it to test on my Google Pixel phone, registration and login both fail on my phone. The error message I am getting on Login is "Error parsing response from server, please try again!" which is in my UILogin.cs. Yet there is nothing else attached. I tried following the Unity documentation for debugging, adb, and DDMS to get access to find out what is happening but I have failed on all those ventures. Is there something particularly different about Android and WWW objects or web communications? Here is a portion of my UILogin.cs and also will include the Login.php.
UILogin.cs
IEnumerator AttemptLogin(bool quickLogin)
{
CreateLoadingScreen();
DeactivateForm();
WWWForm form = new WWWForm();
form.AddField("email", Email.text);
form.AddField("password", Password.text);
WWW www = new WWW(URL.GetLoginURL, form);
yield return www;
DestroyLoadingScreen();
ActivateForm();
ParseResult(www.text, quickLogin);
}
void ParseResult(string result, bool quickLogin)
{
byte resultCode;
if (!byte.TryParse(result, out resultCode))
Result.text = "Error parsing response from server, please try again!";
else if (resultCode == 0)
{
if (RememberToggle.isOn && !quickLogin) // Remember me
{
PlayerPrefs.SetInt("remember", 1);
PlayerPrefs.SetString("email", Email.text);
PlayerPrefs.SetString("password", Password.text);
}
else if (!quickLogin)
{
TemporaryAccount.Email = Email.text;
TemporaryAccount.Password = Password.text;
}
SceneManager.LoadScene(3);
}
else // Failure
{
if (quickLogin)
ShowForm();
Result.text = WebError.GetLoginError(resultCode);
}
}
Login.php
<?php
require "conn.php";
$stmt = $pdo->prepare("SELECT * FROM account WHERE email=:email");
$stmt->bindParam(":email", $_POST['email']);
$stmt->execute();
$count = $stmt->rowCount(); // gets count of records found
if($count > 0) {
$result = $stmt->fetch(); // gets resultset
if(!password_verify($_POST['password'], $result[4]))
echo "2";
else
echo "0";
}
else {
echo "1";
}
?>
Any ideas?
Update #1
I printed www.text and www.error after the yield return www; Text is null and error says: Unknown Error.
Update #2
Interestingly enough, I get Unknown Error from this as well:
Clickme.cs
using System.Collections;
using UnityEngine;
using UnityEngine.UI;
public class Clickme : MonoBehaviour
{
public Text Result;
public void OnClick()
{
StartCoroutine(RunScript());
}
IEnumerator RunScript()
{
WWW www = new WWW("http://www.familypolaris.com/helloWorld.php");
yield return www;
if (www.text == "")
Result.text = "Result was empty, error: " + www.error;
}
}
HelloWorld.php
<?php
echo "Hello World!";
?>
I figured it out, so I will post the answer here. After somebody commented that they tried my code and it worked just fine, I decided to try another device here. That device also failed to register and login. This told me something was wrong with my build settings. My first idea was to switch build type from Gradle to Internal, and that solved the problem for both my devices immediately.
I am trying to connect to a MS SQL database through Unity. However, when I try to open a connection, I get an IOException: Connection lost.
I have imported System.Data.dll from Unity\Editor\Data\Mono\lib\mono\2.0. I am using the following code:
using UnityEngine;
using System.Collections;
using System.Data.Sql;
using System.Data.SqlClient;
public class SQL_Controller : MonoBehaviour {
string conString = "Server=myaddress.com,port;" +
"Database=databasename;" +
"User ID=username;" +
"Password=password;";
public string GetStringFromSQL()
{
LoadConfig();
string result = "";
SqlConnection connection = new SqlConnection(conString);
connection.Open();
Debug.Log(connection.State);
SqlCommand Command = connection.CreateCommand();
Command.CommandText = "select * from Artykuly2";
SqlDataReader ThisReader = Command.ExecuteReader();
while (ThisReader.Read())
{
result = ThisReader.GetString(0);
}
ThisReader.Close();
connection.Close();
return result;
}
}
This is the error I get:
IOException: Connection lost
Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacketHeader ()
Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacket ()
Mono.Data.Tds.Protocol.TdsComm.GetByte ()
Mono.Data.Tds.Protocol.Tds.ProcessSubPacket ()
Mono.Data.Tds.Protocol.Tds.NextResult ()
Mono.Data.Tds.Protocol.Tds.SkipToEnd ()
Rethrow as TdsInternalException: Server closed the connection.
Mono.Data.Tds.Protocol.Tds.SkipToEnd ()
Mono.Data.Tds.Protocol.Tds70.Connect (Mono.Data.Tds.Protocol.TdsConnectionParameters connectionParameters)
Mono.Data.Tds.Protocol.Tds80.Connect (Mono.Data.Tds.Protocol.TdsConnectionParameters connectionParameters)
Please disregard any security risks with this approach, I NEED to do this for testing, security will come later.
Thank you for your time.
Please disregard any security risks with this approach
Do not do it like this. It doesn't matter if security will come before or after. You will end of re-writing the whole code because the password is hard-coded in your application which can be decompiled and retrieved easily. Do the connection the correct way now so that you won't have to re-write the whole application.
Run your database command on your server with php, perl or whatever language you are comfortable with but this should be done on the server.
From Unity, use the WWW or UnityWebRequest class to communicate with that script and then, you will be able to send and receive information from Unity to the server. There are many examples out there. Even with this, you still need to implement your own security but this is much more better than what you have now.
You can also receive data multiple with json.
Below is a complete example from this Unity wiki. It shows how to interact with a database in Unity using php on the server side and Unity + C# on the client side.
Server Side:
Add score with PDO:
<?php
// Configuration
$hostname = 'localhot';
$username = 'yourusername';
$password = 'yourpassword';
$database = 'yourdatabase';
$secretKey = "mySecretKey"; // Change this value to match the value stored in the client javascript below
try {
$dbh = new PDO('mysql:host='. $hostname .';dbname='. $database, $username, $password);
} catch(PDOException $e) {
echo '<h1>An error has ocurred.</h1><pre>', $e->getMessage() ,'</pre>';
}
$realHash = md5($_GET['name'] . $_GET['score'] . $secretKey);
if($realHash == $hash) {
$sth = $dbh->prepare('INSERT INTO scores VALUES (null, :name, :score)');
try {
$sth->execute($_GET);
} catch(Exception $e) {
echo '<h1>An error has ocurred.</h1><pre>', $e->getMessage() ,'</pre>';
}
}
?>
Retrieve score with PDO:
<?php
// Configuration
$hostname = 'localhost';
$username = 'yourusername';
$password = 'yourpassword';
$database = 'yourdatabase';
try {
$dbh = new PDO('mysql:host='. $hostname .';dbname='. $database, $username, $password);
} catch(PDOException $e) {
echo '<h1>An error has occurred.</h1><pre>', $e->getMessage() ,'</pre>';
}
$sth = $dbh->query('SELECT * FROM scores ORDER BY score DESC LIMIT 5');
$sth->setFetchMode(PDO::FETCH_ASSOC);
$result = $sth->fetchAll();
if(count($result) > 0) {
foreach($result as $r) {
echo $r['name'], "\t", $r['score'], "\n";
}
}
?>
Enable cross domain policy on the server:
This file should be named "crossdomain.xml" and placed in the root of your web server. Unity requires that websites you want to access via a WWW Request have a cross domain policy.
<?xml version="1.0"?>
<cross-domain-policy>
<allow-access-from domain="*"/>
</cross-domain-policy>
Client/Unity Side:
The client code from Unity connects to the server, interacts with PDO and adds or retrieves score depending on which function is called. This client code is slightly modified to compile with the latest Unity version.
private string secretKey = "mySecretKey"; // Edit this value and make sure it's the same as the one stored on the server
public string addScoreURL = "http://localhost/unity_test/addscore.php?"; //be sure to add a ? to your url
public string highscoreURL = "http://localhost/unity_test/display.php";
//Text to display the result on
public Text statusText;
void Start()
{
StartCoroutine(GetScores());
}
// remember to use StartCoroutine when calling this function!
IEnumerator PostScores(string name, int score)
{
//This connects to a server side php script that will add the name and score to a MySQL DB.
// Supply it with a string representing the players name and the players score.
string hash = Md5Sum(name + score + secretKey);
string post_url = addScoreURL + "name=" + WWW.EscapeURL(name) + "&score=" + score + "&hash=" + hash;
// Post the URL to the site and create a download object to get the result.
WWW hs_post = new WWW(post_url);
yield return hs_post; // Wait until the download is done
if (hs_post.error != null)
{
print("There was an error posting the high score: " + hs_post.error);
}
}
// Get the scores from the MySQL DB to display in a GUIText.
// remember to use StartCoroutine when calling this function!
IEnumerator GetScores()
{
statusText.text = "Loading Scores";
WWW hs_get = new WWW(highscoreURL);
yield return hs_get;
if (hs_get.error != null)
{
print("There was an error getting the high score: " + hs_get.error);
}
else
{
statusText.text = hs_get.text; // this is a GUIText that will display the scores in game.
}
}
public string Md5Sum(string strToEncrypt)
{
System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding();
byte[] bytes = ue.GetBytes(strToEncrypt);
// encrypt bytes
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] hashBytes = md5.ComputeHash(bytes);
// Convert the encrypted bytes back to a string (base 16)
string hashString = "";
for (int i = 0; i < hashBytes.Length; i++)
{
hashString += System.Convert.ToString(hashBytes[i], 16).PadLeft(2, '0');
}
return hashString.PadLeft(32, '0');
}
This is just an example on how to properly do this. If you need to implement session feature and care about security, look into the OAuth 2.0 protocol. There should be existing libraries that will help get started with the OAuth protocol.
An alternative would be to create your own dedicated server in a command prompt to do your communication and connecting it to unity to Handel multiplayer and SQL communication. This way you can stick with it all being created in one language. But a pretty steep learning curve.
Unity is game engine.
so That's right what the answer says.
but, Some domains need to connect database directly.
You shouldn't do that access database directly in game domain.
Anyway, The problem is caused by NON-ENGLISH computer name.
I faced sort of following errors at before project.
IOException: Connection lost
Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacketHeader ()
Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacket ()
Mono.Data.Tds.Protocol.TdsComm.GetByte ()
Mono.Data.Tds.Protocol.Tds.ProcessSubPacket ()
Mono.Data.Tds.Protocol.Tds.NextResult ()
Mono.Data.Tds.Protocol.Tds.SkipToEnd ()
Rethrow as TdsInternalException: Server closed the connection.
Mono.Data.Tds.Protocol.Tds.SkipToEnd ()
Mono.Data.Tds.Protocol.Tds70.Connect (Mono.Data.Tds.Protocol.TdsConnectionParameters connectionParameters)
Mono.Data.Tds.Protocol.Tds80.Connect (Mono.Data.Tds.Protocol.TdsConnectionParameters connectionParameters)
And after changing computer name as ENGLISH, It works.
I don't know how it's going. But It works.
Mono's System.Data.dll has some issues in P.C has NON-ENGLISH Computer name.
So, at least Unity project.
You should tell your customer Do not set their computer name as NON-ENGLISH.
I don't know people in mono knows these issue or not.
---------- It's OK in after 2018 version ----------
Api Compatibility Level > .Net 4.x
You can connect database in Non-english computer name machine.
Im trying to get some text from my localhost with the following c# code:
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class get_kings : MonoBehaviour {
public string url = "http://localhost/kings/get_kings.php";
public string firstname;
public Text countText;
IEnumerator Start() {
// hämta hem data om kungarna
WWW www = new WWW(url);
// vänta på att datana laddas ner
yield return www;
// spara texten
firstname = www.text;
Debug.Log (firstname);
setCountText ();
}
void setCountText() {
countText.text = firstname;
}
Problem being it displays the text but all my special chars like Å Ä Ö gets the dreaded black questionmark. No matter what collation/charset i run from my db.
<?php include "db_connect.php"?>
<?php
//get all data from db
$sql = "SELECT *FROM testar";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo $row["name"];
}
} else {
echo "0 results";
}
$conn->close();
?>
No matter if i run utf-8 utf-16 or anything else I cannot get the special chars to be displayed correctly when running my unity application. Is there something i can do in unity to force the encoding?
/Emil
I made a workaround by using:
mysqli_set_charset($conn,"utf8");
Thanks.
Assuming you are outputting to a browser, set the charset for the html. w3schools
<meta charset="UTF-8">
It's good to make sure that all your pieces are speaking in the same charset.
So my project as of now is almost working:
It connects to facebook
It takes the Facebook ID and sends it to a script/iterator to handle connection
That script then sends off a concatenated string to a php url, which correctly checks my dataTable for an entry, and if not creates an entry
After that the php code echo's a text reply: OldUser/NewUserCreated/NewUserFailed
And here's where my problem starts:
the aim is to get the text from the echo, then check that string, if it works then unity moves on to the next scene and goes on, however when checking the string it fails for some reason, before I explain further here's my iterator that handles the connection:
IEnumerator Connect()
{
//call databasequeries and get sDBConnect
string sConnectPhp = GameObject.FindGameObjectWithTag("DBConnector").GetComponent<DatabaseQueries>().sDBConnect;
//now ready the url with the necessary code for php's get, and the FacebookID
string url = sConnectPhp + "?UserID=" + sFacebookID;
WWW wwwGet = new WWW(url);
yield return wwwGet;
string sTemp = wwwGet.text.ToString();
if(wwwGet.error == null)
{
print (sTemp);
if(sTemp == "OldUser")
{
//if successfully connected set to true
print ("connectToDatabase: successful");
bDatabaseConnected = true;
}
else if(sTemp == "NewUserCreated")
{
//if successfully connected set to true
print ("connectToDatabase: successful");
bDatabaseConnected = true;
}
else if(sTemp == "NewUserFailed")
{
//game connection has failed
print ("connectToDatabase: failed");
bDatabaseConnected = false;
bConnectionFailed = true;
}
}
else
{
//game connection has failed
print ("connectToDatabase: failed");
bDatabaseConnected = false;
bConnectionFailed = true;
}
}
Now my problem is that sTemp is printing in the unity console: OldUser, and it's not matching my if else condition? I have tried copying wwwGet.text without ToString but that doesn't work either - printing shows OldUser, but it doesn't match the condition
My only guess is that I haven't used ToString correctly, but my searches have shown it being used for Decimal and currency conversion, and as said without toString sTemp is not matching, any ideas as to why it's not matching?