1 00:00:07,900 --> 00:00:08,800 This video. 2 00:00:08,800 --> 00:00:17,140 Let's see how we can connect our application to MongoDB server so that we can start to work with what's 3 00:00:17,170 --> 00:00:18,790 Mongo DB. 4 00:00:18,820 --> 00:00:23,110 So here we go on the MongoDB JS file. 5 00:00:23,140 --> 00:00:26,440 Let's go ahead and require the package we install. 6 00:00:26,440 --> 00:00:30,280 That is the MongoDB from the previous video. 7 00:00:30,280 --> 00:00:35,950 So now let me collapse this and now let me require the MongoDB package. 8 00:00:36,250 --> 00:00:38,500 And on that we have different methods. 9 00:00:38,500 --> 00:00:48,160 So I'm going to structure what we want so required and then the MongoDB package and here we go. 10 00:00:48,430 --> 00:00:54,340 At this point we are not going to use Mongoose, you are going to use purely MongoDB as you move on. 11 00:00:54,340 --> 00:00:57,310 We are going to use Mongoose to make our life easier. 12 00:00:57,310 --> 00:00:58,540 So let's go. 13 00:00:58,630 --> 00:01:04,540 What I want for MongoDB is what we call Mongo client. 14 00:01:04,810 --> 00:01:07,150 Mongo client. 15 00:01:07,150 --> 00:01:10,060 So this one and that is it. 16 00:01:10,480 --> 00:01:18,010 So the next step is we need to have what is called the connection string, meaning the connection string 17 00:01:18,010 --> 00:01:21,700 that we are going to use to connect to MongoDB. 18 00:01:21,730 --> 00:01:30,280 So where can we get connections training after creating account with MongoDB we have access to our connection 19 00:01:30,280 --> 00:01:33,940 string, but let's see example of the connection string. 20 00:01:33,940 --> 00:01:41,410 So this is where we lived and that the process of installing MongoDB and if we scroll down and connect 21 00:01:41,410 --> 00:01:48,010 to MongoDB, let's click on that and let's click on the Connection Guide. 22 00:01:48,010 --> 00:01:50,110 So click on that. 23 00:01:50,410 --> 00:01:53,830 And here we have what is called the connection string. 24 00:01:53,830 --> 00:01:56,170 So what is the connection string? 25 00:01:56,170 --> 00:02:05,200 Well, the connection string is a set of instructions that the driver uses to connect to a MongoDB deployment. 26 00:02:05,230 --> 00:02:13,090 It instruct the driver on how to connect to MongoDB and how it should have why connected. 27 00:02:13,090 --> 00:02:20,500 So let's look at the formats we have MongoDB, which is a protocol, and then the username password 28 00:02:20,500 --> 00:02:22,030 with our credentials. 29 00:02:22,090 --> 00:02:28,780 Remember upon creating we provided username and password and I told you that save the password somewhere 30 00:02:28,780 --> 00:02:30,640 else because you may need it. 31 00:02:30,640 --> 00:02:36,880 And what comes after add is what you call the hostname and then with the connection options. 32 00:02:36,880 --> 00:02:39,310 So how can we get our connection string? 33 00:02:39,310 --> 00:02:40,480 It's pretty easy. 34 00:02:40,480 --> 00:02:45,310 So back to the MongoDB dashboard and then let's click on database. 35 00:02:45,730 --> 00:02:51,130 And next step is we are going to connect application to our application. 36 00:02:51,130 --> 00:02:53,530 So let's click on Connect. 37 00:02:54,990 --> 00:02:56,610 And here you go. 38 00:02:56,760 --> 00:03:03,660 You can see that we have couple of options connect to MongoDB, share, like I said, and connect your 39 00:03:03,660 --> 00:03:04,550 application. 40 00:03:04,560 --> 00:03:13,080 So let's click on the second one, connect your application and here is asking us to select our driver 41 00:03:13,080 --> 00:03:15,300 because we are working with MongoDB. 42 00:03:15,330 --> 00:03:18,330 Let's select the driver and then the version. 43 00:03:18,330 --> 00:03:21,480 Let's select the latest version which is 4.1. 44 00:03:21,480 --> 00:03:28,290 So make sure that you select 4.1 and after that the next step says that add your connection string. 45 00:03:28,290 --> 00:03:30,450 So this is our connection code. 46 00:03:30,450 --> 00:03:37,830 Like we explained before, we have the protocol here, the user name and password, and the other option 47 00:03:37,830 --> 00:03:43,200 is that so click on this one and now back to our application. 48 00:03:43,200 --> 00:03:46,200 Let's create a variable called you are error. 49 00:03:46,200 --> 00:03:52,770 So cost you are error is equal to code and paste the connection string. 50 00:03:52,770 --> 00:03:56,190 So this is same as we have explored before. 51 00:03:56,580 --> 00:04:00,710 The next step is we need to provide the password. 52 00:04:00,730 --> 00:04:06,480 You remember I asked you to work to save your password, but in case you have forgotten, don't worry, 53 00:04:06,480 --> 00:04:07,620 we can get it back. 54 00:04:07,890 --> 00:04:11,310 So the next step is click on database access. 55 00:04:11,310 --> 00:04:15,120 So if you want to add a new user, you can go ahead and do that. 56 00:04:15,330 --> 00:04:16,019 All right. 57 00:04:16,230 --> 00:04:23,790 So the next step is network access of which we have done it when we're configuring our account. 58 00:04:23,880 --> 00:04:30,540 So for this IP address, anyone can have access to our MongoDB, meaning that a person can create can 59 00:04:30,540 --> 00:04:34,170 delete config based on our business logic. 60 00:04:34,440 --> 00:04:44,640 So in case you have forgotten your password, click on the database access and next is click on edit 61 00:04:44,640 --> 00:04:51,360 and here you can edit your password as that generate and copy and that is it. 62 00:04:51,540 --> 00:04:56,790 Well, next step is let's connect our application to MongoDB. 63 00:04:56,820 --> 00:05:00,120 But here is a problem one. 64 00:05:00,120 --> 00:05:06,750 Since we are going to talk to external server, we don't know when the server or the connection will 65 00:05:06,750 --> 00:05:07,770 be successful. 66 00:05:08,100 --> 00:05:13,440 It can happen that our connection will fail or it will be successful. 67 00:05:13,440 --> 00:05:16,320 So we need to handle all these cases. 68 00:05:16,410 --> 00:05:19,530 So we have couple of options to handle this. 69 00:05:19,530 --> 00:05:25,410 One, we can use callback or we can use promise or we can use async await. 70 00:05:25,680 --> 00:05:26,880 Let's get going. 71 00:05:26,880 --> 00:05:34,830 I'm going to use arrow function and the name of my connection going to be as DB connect equal to my 72 00:05:34,830 --> 00:05:37,110 arrow function as that. 73 00:05:37,290 --> 00:05:44,910 And since I'm going to use async await, I'll mark my function as an async and inside a function body, 74 00:05:44,910 --> 00:05:48,450 our brain might try and catch inside a try. 75 00:05:48,450 --> 00:05:55,830 I'm going to implement if everything goes on well and inside the catch, if something goes wrong, I'm 76 00:05:55,830 --> 00:05:57,360 going to display some message. 77 00:05:57,360 --> 00:05:59,340 So now here we go. 78 00:05:59,430 --> 00:06:05,580 The next step is I need to create an instance of my new MongoDB client. 79 00:06:05,580 --> 00:06:07,140 So here we go. 80 00:06:07,470 --> 00:06:20,610 So I'll give it a comment as create new client and make use of cost and client equal to new and make 81 00:06:20,610 --> 00:06:24,060 use of Mongo clients, which is this one. 82 00:06:24,060 --> 00:06:28,110 And for this our pass in the connection string which is this. 83 00:06:28,110 --> 00:06:32,370 So our pass in the you are error and that is it. 84 00:06:32,670 --> 00:06:38,880 So inside here, let's go ahead and connect to DB or MongoDB. 85 00:06:38,970 --> 00:06:42,930 So I'm going to await the client instance on that. 86 00:06:42,930 --> 00:06:51,360 We have a method called connect and as a function or method as that and inside the catch, if something 87 00:06:51,360 --> 00:06:57,660 goes wrong, why not go ahead and console.log the error as that. 88 00:06:57,660 --> 00:07:02,970 The next step is I need to call this function DB connect. 89 00:07:02,970 --> 00:07:10,560 So now save it and let's run the server or the application or the file and let's see if we are going 90 00:07:10,560 --> 00:07:12,930 to see connection successful. 91 00:07:12,930 --> 00:07:20,610 So here inside the try, let's provide a message to the user if the connection was successful. 92 00:07:20,610 --> 00:07:22,440 So I would say that DB. 93 00:07:23,590 --> 00:07:27,280 Connected successfully. 94 00:07:28,380 --> 00:07:29,280 All right, save it. 95 00:07:29,280 --> 00:07:30,870 And now back to the terminal. 96 00:07:30,900 --> 00:07:35,370 Make use of node and then the file is MongoDB. 97 00:07:35,400 --> 00:07:36,240 Hit enter. 98 00:07:36,720 --> 00:07:40,610 And if we see that DB connected successfully. 99 00:07:40,620 --> 00:07:47,130 So at this point we are able to connect our application to MongoDB. 100 00:07:47,370 --> 00:07:56,820 So now it's time to explore more about MongoDB, how we can create record and save it into our MongoDB 101 00:07:56,850 --> 00:07:58,350 account here. 102 00:07:58,590 --> 00:08:04,020 All right, so let's try to change the password and let's see if we're going to get an error. 103 00:08:04,020 --> 00:08:09,840 So I have remove some portion of my password, save it back to the terminal. 104 00:08:10,020 --> 00:08:12,240 Restarted and let's see. 105 00:08:13,040 --> 00:08:20,900 And you can see I have beautiful error, mongo server error, bad authentication meaning that I have 106 00:08:20,900 --> 00:08:26,200 provided that password or username, which is true. 107 00:08:26,210 --> 00:08:30,500 So let me bring it back to defaults and save it. 108 00:08:30,860 --> 00:08:33,350 And let's run the file again. 109 00:08:33,350 --> 00:08:35,380 And here you go. 110 00:08:35,390 --> 00:08:36,350 Please come. 111 00:08:36,890 --> 00:08:39,110 MongoDB connected. 112 00:08:39,140 --> 00:08:39,740 Great. 113 00:08:39,740 --> 00:08:44,690 So now it's time for us to learn more about MongoDB. 114 00:08:44,720 --> 00:08:53,000 The next video we will start with growth operations, how we can create, record, delete, update and 115 00:08:53,000 --> 00:08:53,690 fetch all. 116 00:08:53,690 --> 00:08:56,090 Let's get into that the next video.