feat(services): add getById and delete methods in mysql.service.ts

The changes introduce two new methods in mysql.service.ts. The getById method retrieves a category from the database using its ID while the delete method will delete a category from the database using the provided category ID. Both methods return promises.

Issue: #6
Signed-off-by: Mathis <yidhra@tuta.io>

src/services/mysql.service.ts

@@ -441,6 +441,14 @@ const MySqlService = {
 				}
 			})
 		},
+		/**
+		 * Retrieves a category from the database by its ID.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler object used for execution.
+		 * @param {string} categoryId - The ID of the category to retrieve.
+		 * @returns {Promise<IDbCategory>} - A Promise that resolves with the category object.
+		 * @throws {Error} - If an error occurs during execution.
+		 */
 		getById(handler: MysqlHandler, categoryId: string): Promise<IDbCategory> {
 			return new Promise((resolve, reject) => {
 				if (!categoryId) return reject('slug is undefined')
@@ -454,6 +462,19 @@ const MySqlService = {
 				}
 			});
 		},
+		delete(handler: MysqlHandler, categoryId: string) {
+			return new Promise((resolve, reject) => {
+				if (!categoryId) return reject('Id is undefined');
+				if (categoryId.length !== 36) return reject('Id invalid');
+				const _sql = "DELETE FROM `categories` WHERE `id` = ?";
+				const _values = [categoryId];
+				try {
+					resolve(handler.execute(_sql, _values));
+				} catch (err: unknown) {
+					reject(err as Error);
+				}
+			})
+		}
 	}
 }