Try to gum up the works on connection errors

lib/adapters/Firebird.js

@@ -10,6 +10,10 @@ class Firebird extends Adapter {
 		super({});
 		fb.attach(config, (err, instance) => {
 			this.instance = instance;
+
+			if (err) {
+				throw new Error(err);
+			}
 		});
 	}
 

lib/adapters/Mysql.js

@@ -9,7 +9,11 @@ class Mysql extends Adapter {
 
 	constructor(config) {
 		let instance = mysql2.createConnection(config);
-		instance.connect();
+		instance.connect(err => {
+			if (err) {
+				throw new Error(err);
+			}
+		});
 		super(instance);
 	}
 

lib/adapters/Pg.js

@@ -36,6 +36,10 @@ class Pg extends Adapter {
 
 			instance.connect(err => {
 				connected = true;
+
+				if (err) {
+					throw new Error(err);
+				}
 			});
 		}