CRUD Operation in MySQL Using PHP, Volley Android - Insert Data - GeeksforGeeks

27 Dec, 2021
It is known that we can use MySQL to use Structure Query Language to store the data in the form of RDBMS. SQL is the most popular language for adding, accessing and managing content in a database. It is most noted for its quick processing, proven reliability, ease, and flexibility of use. The application is used for a wide range of purposes, including data warehousing, e-commerce, and logging applications. MySQL provides a set of some basic but most essential operations that will help you to easily interact with the MySQL database and these operations are known as CRUD operations.
In the previous article, we have seen creating a new SQL database in the PhpMydmin service. In this article, we will perform the Insert data operation. Before performing this operation first of all we have to create a new PHP script for adding new data to that database in our SQL Database. 
Prerequisite: You should be having Postman installed in your system to test this PHP script. 
We will be building a simple PHP script in which we will be used to add data to our SQL table which we have created in our previous article. Using this script we will be adding data to our SQL table. 
Step 1: Start your XAMPP server which we have seen starting in the previous article 
In the previous article, we have seen starting our XAMPP server and we also have created our database. In this article, we will be creating a script for adding data to our database. 
Step 2: Navigate to xampp folder 
Now we have to navigate to C drive in your pc and inside that check for the folder name as xampp. Inside that folder navigate to htdocs folder and create a new folder in that and name it as courseApp. Inside this folder, we will be storing all our PHP scripts. Now for writing your PHP script we can use any simple text editor. I am using VS code. After creating this folder we simply have to open this folder in VS code. 
Step 3: Creating a new PHP file 
After you open your folder in VS code, inside that folder we have to press a shortcut key as Ctrl+N our new file will be created. We have to save this file with the name addCourses.php and add the below code to it. Comments are added in the code to get to know in more detail.   
PHP
<?php $servername = "localhost"; // for testing the user name is root.$username = "root"; // the password for testing is "blank"$password = ""; // below is the name for our// database which we have added.$dbname = "id16310745_gfgdatabase";  // Create connection$conn = new mysqli($servername, $username, $password, $dbname);  // an array to display response $response = array(); // on below line we are checking if the body provided by user contains // this keys as course name,course description and course duration if($_POST['courseName'] && $_POST['courseDuration'] && $_POST['courseDescription']){     // if above three parameters are present then we are extravting values     // from it and storing it in new variables.     $courseName = $_POST['courseName'];     $courseDuration = $_POST['courseDuration'];     $courseDescription = $_POST['courseDescription'];     // after that we are writing an sql query to     // add this data to our database.     // on below line make sure to add your table name     // in previous article we have created our table name     // as courseDb and add all column headers to it except our id.     $stmt = $conn->prepare("INSERT INTO `courseDb`(`courseName`, `courseDuration`, `courseDescription`) VALUES (?,?,?)");     $stmt->bind_param("sss",$courseName,$courseDuration,$courseDescription);   // on below line we are checking if our sql query is executed successfully.   if($stmt->execute() == TRUE){        // if the script is executed successfully we are        // passing data to our response object        // with a success message.         $response['error'] = false;         $response['message'] = "course created successfully!";     } else{         // if we get any error we are passing error to our object.         $response['error'] = true;         $response['message'] = "failed\n ".$conn->error;     } } else{     // this msethod is called when user     // donot enter sufficient parameters.     $response['error'] = true;     $response['message'] = "Insufficient parameters"; } // at last we are prinintg our response which we get. echo json_encode($response); ?>
 Step 4: Getting URL for our PHP script 
For getting the URL for our PHP script we simply have to type localhost in our browser and we have to append it with our folder name and file name. You will get to see the URL highlighted below:  
http://localhost/courseApp/addCourses.php
Now we will be adding data in our SQL table with this URL in postman.  
Step 5: Testing our PHP Script in Postman 
For testing your PHP script select the POST method in postman as we will be posting data to our SQL table and inside the URL section add the above URL. After adding the URL. Now click on the Body tab which is shown in the below screenshot and inside that select x-www-form-urlencoded and after that add the parameters in the below section as shown in the screenshot. Make sure the key which you are entering must be the same as that we have used for naming our columns in our SQL table. After adding all the data. Now click on Send option to send data to our SQL table.  
After sending this request our data has been added to our SQL table. You can get to see the data added in the PhpMyAdmin console in the below screenshot.  
In the upper part, we have created a PHP script for adding data to our SQL table. Along with that we have also tested that script by adding data to it. In this part, we will integrate that in our Android App and add data to our SQL table from our Android app. 
We will be building a simple application in which we will be simply adding course details from a simple form in our SQL table which we have created. For performing this operation we will be using the Volley library which is used for JSON parsing in Android. Below is the video in which we will get to see what we are going to build in this article. 
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language. 
Step 2: Add the below dependency in your build.gradle file
Below is the dependency for Volley which we will be using to get the data from API. For adding this dependency navigate to the app > Gradle Scripts > build.gradle(app) and add the below dependency in the dependencies section.  
implementation ‘com.android.volley:volley:1.1.1’
After adding this dependency sync your project and now move towards the AndroidManifest.xml part.   
Step 3: Adding permissions to the internet in the AndroidManifest.xml file
Navigate to the app > AndroidManifest.xml and add the below code to it.   
XML
<!--permissions for INTERNET--><uses-permission android:name="android.permission.INTERNET"/>
 Step 4: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file.  
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity">     <!--Edit text for getting course Name-->    <EditText        android:id="@+id/idEdtCourseName"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginStart="10dp"        android:layout_marginTop="20dp"        android:layout_marginEnd="10dp"        android:hint="Course Name"        android:importantForAutofill="no"        android:inputType="text" />     <!--Edittext for getting course Duration-->    <EditText        android:id="@+id/idEdtCourseDuration"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginStart="10dp"        android:layout_marginTop="20dp"        android:layout_marginEnd="10dp"        android:hint="Course Duration in min"        android:importantForAutofill="no"        android:inputType="time" />     <!--Edittext for getting course Description-->    <EditText        android:id="@+id/idEdtCourseDescription"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginStart="10dp"        android:layout_marginTop="20dp"        android:layout_marginEnd="10dp"        android:hint="Course Description"        android:importantForAutofill="no"        android:inputType="text" />     <!--Button for adding your course to Firebase-->    <Button        android:id="@+id/idBtnSubmitCourse"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="10dp"        android:text="Submit Course Details"        android:textAllCaps="false" />     </LinearLayout>
 Step 5: Working with the MainActivity.java file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail. 
Java
import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import com.android.volley.Request;import com.android.volley.RequestQueue;import com.android.volley.VolleyError;import com.android.volley.toolbox.StringRequest;import com.android.volley.toolbox.Volley; import org.json.JSONException;import org.json.JSONObject; import java.util.HashMap;import java.util.Map; public class MainActivity extends AppCompatActivity {         // creating variables for our edit text    private EditText courseNameEdt, courseDurationEdt, courseDescriptionEdt;        // creating variable for button    private Button submitCourseBtn;         // creating a strings for storing our values from edittext fields.    private String courseName, courseDuration, courseDescription;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                 // initializing our edittext and buttons        courseNameEdt = findViewById(R.id.idEdtCourseName);        courseDescriptionEdt = findViewById(R.id.idEdtCourseDescription);        courseDurationEdt = findViewById(R.id.idEdtCourseDuration);        submitCourseBtn = findViewById(R.id.idBtnSubmitCourse);        submitCourseBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                                 // getting data from edittext fields.                courseName = courseNameEdt.getText().toString();                courseDescription = courseDescriptionEdt.getText().toString();                courseDuration = courseDurationEdt.getText().toString();                 // validating the text fields if empty or not.                if (TextUtils.isEmpty(courseName)) {                    courseNameEdt.setError("Please enter Course Name");                } else if (TextUtils.isEmpty(courseDescription)) {                    courseDescriptionEdt.setError("Please enter Course Description");                } else if (TextUtils.isEmpty(courseDuration)) {                    courseDurationEdt.setError("Please enter Course Duration");                } else {                    // calling method to add data to Firebase Firestore.                    addDataToDatabase(courseName, courseDescription, courseDuration);                }            }        });    }     private void addDataToDatabase(String courseName, String courseDescription, String courseDuration) {                 // url to post our data        String url = "http://localhost/courseApp/addCourses.php";                 // creating a new variable for our request queue        RequestQueue queue = Volley.newRequestQueue(MainActivity.this);                 // on below line we are calling a string        // request method to post the data to our API        // in this we are calling a post method.        StringRequest request = new StringRequest(Request.Method.POST, url, new com.android.volley.Response.Listener<String>() {            @Override            public void onResponse(String response) {                Log.e("TAG", "RESPONSE IS " + response);                try {                    JSONObject jsonObject = new JSONObject(response);                    // on below line we are displaying a success toast message.                    Toast.makeText(MainActivity.this, jsonObject.getString("message"), Toast.LENGTH_SHORT).show();                } catch (JSONException e) {                    e.printStackTrace();                }                // and setting data to edit text as empty                courseNameEdt.setText("");                courseDescriptionEdt.setText("");                courseDurationEdt.setText("");            }        }, new com.android.volley.Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // method to handle errors.                Toast.makeText(MainActivity.this, "Fail to get response = " + error, Toast.LENGTH_SHORT).show();            }        }) {            @Override            public String getBodyContentType() {                // as we are passing data in the form of url encoded                // so we are passing the content type below                return "application/x-www-form-urlencoded; charset=UTF-8";            }             @Override            protected Map<String, String> getParams() {                                 // below line we are creating a map for storing                // our values in key and value pair.                Map<String, String> params = new HashMap<String, String>();                                 // on below line we are passing our                // key and value pair to our parameters.                params.put("courseName", courseName);                params.put("courseDuration", courseDuration);                params.put("courseDescription", courseDescription);                                 // at last we are returning our params.                return params;            }        };        // below line is to make        // a json object request.        queue.add(request);    }}
 Now run your app and see the output of the code. 
Output:  
You can get to see the data that has been added to your SQL table in the below screenshot.  
 
kapoorsagar226
as5853535
Android
Java
PHP
SQL
Java
Android
SQL
PHP
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Resource Raw Folder in Android Studio
Flutter - Custom Bottom Navigation Bar
How to Read Data from SQLite Database in Android?
Flexbox-Layout in Android
How to Post Data to API using Retrofit in Android?
Arrays in Java
Split() String method in Java with examples
For-each loop in Java
Object Oriented Programming (OOPs) Concept in Java
Stream In Java