add mongodb database

index.js

@@ -2,6 +2,8 @@ const { ApolloServer } = require("apollo-server");
 
 const gql = require("graphql-tag");
 
+const mongoose = require("mongoose");
+
 const typeDefs = gql`
   type Query {
     sayHi: String!
@@ -19,6 +21,14 @@ const server = new ApolloServer({
   resolvers
 });
 
-server.listen({ port: 5001 }).then(res => {
+mongoose
+  .connect("mongodb://test:A12345678@ds119820.mlab.com:19820/merng", {
+    useNewUrlParser: true
+  })
+  .then(() => {
+    console.log("MongoDB Connected");
+    return server.listen({ port: 5001 });
+  })
+  .then(res => {
     console.log(`Server running at ${res.url}`);
-});
+  });