feat(services): update MySQL service to fetch brand data

- Corrected the SQL query in fetching brand data based on ID.
- Added a new function, `getBySlug`, to fetch brand data using the brand slug. This ensures a flexible data access method thus enhancing the service's usability.

Issue: #5
Signed-off-by: Mathis <yidhra@tuta.io>

src/services/mysql.service.ts

@@ -363,7 +363,7 @@ const MySqlService = {
 			return new Promise((resolve, reject) => {
 				if (!brandId) return reject('slug is undefined')
 				if (brandId.length !== 36) return reject('Id invalid');
-				const _sql = "SELECT * FROM `categories` WHERE `id` = ?";
+				const _sql = "SELECT * FROM `brands` WHERE `id` = ?";
 				const _values = [brandId];
 				try {
 					resolve(handler.execute(_sql, _values) as unknown as IDbBrand);
@@ -372,6 +372,26 @@ const MySqlService = {
 					reject(err as Error);
 				}
 			})
+		},
+
+		/**
+		 * Retrieves a brand from the database by its slug.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler object used to connect to the database.
+		 * @param {string} brandSlug - The slug of the brand to retrieve.
+		 * @returns {Promise<IDbBrand>} - A promise that resolves with the brand object if found, or rejects with an error message.
+		 */
+		getBySlug(handler: MysqlHandler, brandSlug: string): Promise<IDbBrand> {
+			return new Promise((resolve, reject) => {
+				if (!brandSlug) return reject('slug is undefined')
+				const _sql = "SELECT * FROM `brands` WHERE `slug_name` = ?";
+				const _values = [brandSlug];
+				try {
+					resolve(handler.execute(_sql, _values) as unknown as IDbBrand);
+				} catch (err: unknown) {
+					reject(err as Error);
+				}
+			})
 		}
 	},
 	Model: {