promise learn

tools/app/promise-learn/build/index.js

@@ -0,0 +1,27 @@
+"use strict";
+const mariadb = require('mariadb');
+let conn;
+mariadb.createConnection({
+    host: 'database',
+    user: 'heroes',
+    password: 'test123',
+    database: 'heroes'
+})
+    .then(conn => {
+    conn.query("SELECT * FROM hero")
+        .then((rows) => {
+        console.log(rows);
+        return rows;
+    })
+        .then((res) => {
+        console.log(res);
+        conn.end();
+    })
+        .catch(err => {
+        console.log(err);
+        conn.end();
+    });
+})
+    .catch(err => {
+    console.log('not connected');
+});