improve logger

back/db/db.ts

@@ -12,7 +12,7 @@ export const db = mysql.createConnection({
 
 db.connect(function (err) {
     if (err) {
-        logger.error(`Unable to connect database ${err.code}`);
+        logger.err(`Unable to connect database ${err.code}`);
     } else {
         logger.log("Database successfully connected");
     }
@@ -45,7 +45,7 @@ export function execQueryAsyncWithId(query: string, values: any[]): Promise<numb
 export function execQuery(query: string, values: any[]) {
     db.query(query, values, (err, results, fields) => {
         if (err) {
-            logger.error(err);
+            logger.err(err);
             throw err;
         }
         return results;