Added onsuccess() to query

src/classes/query.class.js

@@ -17,6 +17,8 @@ class Query {
     this.success = null;
     this.rows = null;
     this.err = null;
+
+    this._onsuccess = null;
   }
 
   /**
@@ -39,6 +41,17 @@ class Query {
     return is.not.emptyString(this.query);
   }
 
+  /**
+   * Sets the onsuccess callback
+   *
+   * @param {Function} onsuccess
+   * @returns Query
+   */
+  onsuccess(onsuccess) {
+    this._onsuccess = onsuccess;
+    return this;
+  }
+
   /**
    * Executes a generic query
    * - returns `true` if successful; `false` otherwise
@@ -59,6 +72,11 @@ class Query {
           resolve(false);
         } else {
           this.rows = res.rows;
+
+          if (this._onsuccess instanceof Function) {
+            this._onsuccess();
+          }
+
           resolve(true);
         }
       });