feat: enhance user management functionality with detailed feedback and improved error handling

backend/database.js

@@ -2,6 +2,7 @@ import mysql from "mysql2";
 import dotenv from "dotenv";
 dotenv.config();
 
+// Create a MySQL connection pool using environment variables for configuration
 const pool = mysql
   .createPool({
     host: process.env.DB_HOST,
@@ -11,21 +12,26 @@ const pool = mysql
   })
   .promise();
 
+// Function to authenticate a user by username and password
 export async function loginUser(username, password) {
+  // Query the users table for a matching username and password
   const [result] = await pool.query(
     "SELECT * FROM users WHERE username = ? AND password = ?",
     [username, password]
   );
 
+  // If a user is found, return success and user data
   if (result.length > 0) {
     console.log("User found: ", result[0].username, " ", result[0].id);
     return { success: true, user: result[0] };
   } else {
+    // If no user is found, return failure message
     console.error(`Invalid username or password!; ${result[0]}`);
     return { success: false, message: "Invalid username or password" };
   }
 }
 
+// Function to create a new user in the database
 export async function createUser(
   username,
   first_name,
@@ -34,19 +40,22 @@ export async function createUser(
   email
 ) {
   try {
+    // Insert a new user record into the users table
     const [result] = await pool.query(
       "INSERT INTO users (username, first_name, last_name, password, email) VALUES (?, ?, ?, ?, ?)",
       [username, first_name, last_name, password, email]
     );
 
     console.log("User created successfully!");
-    return { success: true };
+    return { success: true, message: "User created successfully!" };
   } catch (error) {
-    console.error("Error creating user: ", error);
-    return { success: false, message: "Error creating user" };
+    // Handle errors during user creation
+    console.log("Error creating user: ", error);
+    return { success: false, message: "Error creating user!" };
   }
 }
 
+// Function to update an existing user's information
 export async function updateUser(
   username,
   first_name,
@@ -55,25 +64,36 @@ export async function updateUser(
   email
 ) {
   try {
+    // Update user details based on username
     const [result] = await pool.query(
       "UPDATE users SET first_name = ?, last_name = ?, password = ?, email = ? WHERE username = ?",
       [first_name, last_name, password, email, username]
     );
-    return {
-      success: true,
-      message: "User updated successfully",
-      resultOfquery: result,
-    };
-  } catch (error) {
-    console.error("Error updating user: ", error);
-    return {
-      success: false,
-      message: "Error updating user",
-      resultOfquery: result,
-    };
-  }
+    const resultOfquery = result.affectedRows;
+
+    // If a user was updated, return success
+    if (resultOfquery > 0) {
+      console.log("User updated successfully!");
+      return {
+        success: true,
+        message: "User updated successfully!",
+        resultOfquery: result,
+      };
+    }
+
+    // If no user was updated, return failure
+    if (resultOfquery === 0) {
+      console.log("Error updating user!");
+      return {
+        success: false,
+        message: "Error updating user!",
+        resultOfquery: null,
+      };
+    }
+  } catch (err) {}
 }
 
+// Function to delete a user from the database
 export async function deleteUser(
   username,
   first_name,
@@ -82,26 +102,29 @@ export async function deleteUser(
   email
 ) {
   try {
+    // Delete user based on username and password
     const [result] = await pool.query(
       "DELETE FROM users WHERE username = ?  AND password = ?",
       [username, password]
     );
     const resultOfquery = result.affectedRows;
 
+    // If a user was deleted, return success
     if (resultOfquery > 0) {
       console.log("User deleted successfully!");
       return {
         success: true,
-        message: "User deleted successfully",
+        message: "User deleted successfully!",
         resultOfquery: result,
       };
     }
 
+    // If no user was deleted, return failure
     if (resultOfquery === 0) {
-      console.log("Error deleting user.");
+      console.log("Error deleting user!");
       return {
         success: false,
-        message: "Error deleting user",
+        message: "Error deleting user!",
         resultOfquery: null,
       };
     }