1 00:00:00,240 --> 00:00:06,930 In this video, we are going to developing product method for product lambda microservices with using 2 00:00:06,930 --> 00:00:12,720 Dynamo DB client objects in Adobe's SDK Version three libraries. 3 00:00:13,170 --> 00:00:14,730 So let's get started. 4 00:00:15,090 --> 00:00:18,870 To do so, please open the Visual Studio code and come to our actual logic. 5 00:00:19,140 --> 00:00:22,700 As you remember that we have right this switch statement in the previous video. 6 00:00:22,710 --> 00:00:25,710 So this video we will implement get product method. 7 00:00:25,710 --> 00:00:29,360 That means we are passing the ID information from the parameters. 8 00:00:29,370 --> 00:00:33,090 This will be the gate product by ID operation. 9 00:00:33,090 --> 00:00:40,020 So let me start developing and I will explain after that, I'm going to remove this one and create a 10 00:00:40,020 --> 00:00:40,860 method body. 11 00:00:40,890 --> 00:00:47,460 You can see that this is the our method, but it is using the keyword and it is getting product ID as 12 00:00:47,460 --> 00:00:48,270 a parameter. 13 00:00:48,300 --> 00:00:52,920 And we will query our product table with looking this product ID. 14 00:00:53,610 --> 00:00:55,860 So first of all, I would like to look. 15 00:00:56,790 --> 00:01:00,570 The method and we will insert the gate product method. 16 00:01:00,630 --> 00:01:07,350 And after that I'm going to write it like each block because we will perform the action of. 17 00:01:08,710 --> 00:01:11,020 Communicate it to dynamo DB client object. 18 00:01:11,350 --> 00:01:17,710 So before that it is good to cover we try catch block OC in the trial. 19 00:01:17,710 --> 00:01:23,290 Look basically we will interact with the dynamo DB client object to perform get item command. 20 00:01:23,290 --> 00:01:30,220 So when we interact dynamo DB client object to send get item command, we have two items to develop. 21 00:01:30,250 --> 00:01:36,190 The first one is to create parameters and paste the parameters to the get item command and send this 22 00:01:36,190 --> 00:01:36,490 command. 23 00:01:36,520 --> 00:01:39,340 Be using Dynamo DB client object for that purpose. 24 00:01:39,340 --> 00:01:41,860 Let me copy, paste and explain after that. 25 00:01:41,860 --> 00:01:48,670 So you can see that these are the are parameters to the get item command and we paste this command into 26 00:01:48,670 --> 00:01:52,750 get item command and this will be sent with using to Dynamo DB client object. 27 00:01:53,050 --> 00:02:01,540 After that we will console this item which comes from the Dynamo DB and log this item and return this 28 00:02:01,540 --> 00:02:02,080 item. 29 00:02:02,530 --> 00:02:03,190 Okay. 30 00:02:03,190 --> 00:02:06,400 So we should not forget to add import statement. 31 00:02:06,400 --> 00:02:07,630 We use some libraries. 32 00:02:07,630 --> 00:02:12,270 For example, the first library is Marshall and Marshall operation is. 33 00:02:12,280 --> 00:02:18,820 Remember that these are the utilities for Dynamo DB to simplify these key information without pasting 34 00:02:18,820 --> 00:02:19,960 any data type. 35 00:02:19,960 --> 00:02:27,130 So here you can see that this is very easy and straightforward to use this Marshall operation. 36 00:02:27,130 --> 00:02:34,840 We don't specify any end or s character for string and number data types of dynamo dynamo DB Key Attributes. 37 00:02:34,930 --> 00:02:40,900 Okay, if you come here and collect the control space, you can see that it is using a k util dynamo. 38 00:02:40,900 --> 00:02:48,940 DB Please import this library and verify that this importing marshall library from the Dynamo ADB and 39 00:02:48,940 --> 00:02:50,320 we have also on Marshall. 40 00:02:50,350 --> 00:02:54,460 That means we are using a marshall for return back to JSON object. 41 00:02:54,460 --> 00:03:01,300 So please add our Marshall also and make sure that you have import this statement successfully. 42 00:03:01,450 --> 00:03:07,040 And after that, if you scroll down you can see that we are using Dynamo DB Client Object Edge. 43 00:03:07,120 --> 00:03:10,900 Remember that we have already create the DB client object in the previous section. 44 00:03:10,900 --> 00:03:15,190 So come here, click the control space and import these object. 45 00:03:15,700 --> 00:03:16,840 No, not this one. 46 00:03:16,840 --> 00:03:18,130 Let me come here. 47 00:03:19,890 --> 00:03:20,460 Okay. 48 00:03:20,460 --> 00:03:25,290 We should use the DB client object as a export statement. 49 00:03:25,290 --> 00:03:27,630 I'm going to write by manually. 50 00:03:27,720 --> 00:03:37,110 To do so, let me come here and paste this import statement and make sure that you have added that JS 51 00:03:37,110 --> 00:03:45,380 file and see that we can now reach the dynamic DB client object from our exporting dynamo. 52 00:03:45,390 --> 00:03:48,650 DB Client Node.js Separate Node.js module. 53 00:03:48,660 --> 00:03:52,200 So now let's continue to our import statement, open index. 54 00:03:52,200 --> 00:03:58,740 JS So we have import dynamo DB Client object and make sure and verify that you have import successfully 55 00:03:58,890 --> 00:04:00,600 at the right JavaScript file. 56 00:04:00,600 --> 00:04:03,420 And please don't forget it JavaScript file. 57 00:04:03,660 --> 00:04:08,010 And after that there is a new parameter which is creating new command. 58 00:04:08,010 --> 00:04:11,760 So that's why we should add this command into our import statement. 59 00:04:11,760 --> 00:04:15,750 Come here and click control space and add required command. 60 00:04:16,350 --> 00:04:20,700 Somehow it is not working for me, not adding import statement automatically. 61 00:04:20,730 --> 00:04:25,530 It is showing the right package, but not importing automatically for that purpose. 62 00:04:25,530 --> 00:04:28,110 I'm going to add import statement manually. 63 00:04:28,140 --> 00:04:33,060 If you come here and put this import statement, this is very important. 64 00:04:33,090 --> 00:04:38,760 Make sure that you have import gate item command from the client dynamic DB SDK package. 65 00:04:38,790 --> 00:04:44,880 And if you scroll down, you can see the color of the gate item command is become green, so that means 66 00:04:44,880 --> 00:04:46,980 it is important successfully. 67 00:04:47,430 --> 00:04:53,640 Okay, so let me come here and show the whole method and explain from the secret. 68 00:04:54,120 --> 00:04:56,720 So basically we start with logging. 69 00:04:56,730 --> 00:05:01,830 This is very important because we won't debug any code when developing serverless applications. 70 00:05:01,830 --> 00:05:05,100 So we will check our code from a cloud which logs. 71 00:05:05,100 --> 00:05:08,130 That's why it is important to put logs efficiently. 72 00:05:08,130 --> 00:05:10,470 So that's why we get product log. 73 00:05:10,500 --> 00:05:17,070 That means we will come into this method is the same way if we interact or connect other resources it 74 00:05:17,070 --> 00:05:23,490 is good to cover try cage block in order to follow errors in the cloud watch logs. 75 00:05:23,490 --> 00:05:30,840 So after the log we have covered with the cage block and after that we have full load dynamic DB SDK 76 00:05:30,840 --> 00:05:34,620 documentation and create parameters for the gate item command. 77 00:05:34,670 --> 00:05:36,810 You can see the parameters in here. 78 00:05:36,840 --> 00:05:42,270 Basically, you can think dynamic DB is a service and expose some APIs to us for performing current 79 00:05:42,270 --> 00:05:43,860 operations on database. 80 00:05:43,860 --> 00:05:46,800 And these APIs requires some parameters. 81 00:05:46,800 --> 00:05:53,850 So in our case, we use Git item command dynamic DB API and it requires parameters which including the 82 00:05:53,880 --> 00:05:56,550 table name and the K, which is the primary key. 83 00:05:56,550 --> 00:05:59,160 And in our case it is only partition key. 84 00:05:59,640 --> 00:06:04,410 So if we don't send these parameters, our API will not return success response. 85 00:06:05,770 --> 00:06:08,970 We can check the detail of the gate item command in the SSC class. 86 00:06:08,980 --> 00:06:11,770 If you come here right click and go to definition. 87 00:06:11,890 --> 00:06:15,120 You can see the actual implementation code in here. 88 00:06:15,130 --> 00:06:21,910 So basically, for example, go to get item command input to see parameters. 89 00:06:21,910 --> 00:06:29,650 And if you scroll down and go to get item input, you can see that these are the input parameters that 90 00:06:29,650 --> 00:06:32,560 we should define when we interact with the gate item command. 91 00:06:32,590 --> 00:06:38,710 Here you can see table name key attributes to get consistent need and so on. 92 00:06:38,860 --> 00:06:42,640 As you can see that these two attributes are knowable. 93 00:06:42,640 --> 00:06:45,460 So that means we don't have to set these parameters. 94 00:06:45,460 --> 00:06:51,790 These are the normal parameters and these key and the table name is a monetary, you can see quotation 95 00:06:51,790 --> 00:06:52,120 marks. 96 00:06:52,120 --> 00:06:57,790 So that means these are the mandatory attributes that we should provide when we are using the get item 97 00:06:57,790 --> 00:06:58,360 command. 98 00:06:58,390 --> 00:07:06,580 If you come back to our code, which is the index case, so we can see that we will use get item command 99 00:07:06,580 --> 00:07:09,970 and we have import required get item command statements. 100 00:07:09,970 --> 00:07:17,950 And after that we use this dynamo DB client that said operation and this is async anonymous function 101 00:07:17,950 --> 00:07:23,950 that we send request to the dynamic DB client object and sending get item command as we explained version 102 00:07:23,950 --> 00:07:32,290 three of the JavaScript HDC and these await operation basically return the item into the dynamic DB 103 00:07:32,290 --> 00:07:32,890 table. 104 00:07:33,190 --> 00:07:34,330 This is the item object. 105 00:07:34,330 --> 00:07:42,430 Return back to Dynamo DB table and we basically console look this operation and return back this item 106 00:07:42,430 --> 00:07:44,050 with our Marshall operation. 107 00:07:44,050 --> 00:07:50,350 So that means we are converting as a JSON format and we look the response and return back to method. 108 00:07:50,350 --> 00:07:56,080 So as you can see that we have developed great product method for retrieving a single product item into 109 00:07:56,080 --> 00:07:57,730 Dynamo DB database. 110 00:07:57,730 --> 00:07:59,830 So let's start implement other methods.