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yauhenk

webdev

00:00:02

you are on the channel in pdf, welcome to the

00:00:04

next lesson dedicated to but Jess and in

00:00:07

this video we will transfer the

00:00:08

static data stored on the server to a

00:00:11

real database before that we will

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create the setup and connect our server based on the

00:00:17

result of the lesson we need to get

00:00:19

an application that will write

00:00:21

posts to a database as a base I

00:00:24

will use [ __ ] db

00:00:26

if you watched the graph quelle jacket on the

00:00:28

channel there we also used this

00:00:31

database so the general mechanism should already be

00:00:34

presented if you

00:00:36

are working with databases for the first time then it’s very strong

00:00:38

Don’t worry, I’ll show you everything and

00:00:40

tell you,

00:00:41

especially since manga is one of the

00:00:44

simplest options for you, but the

00:00:46

sql database after registration you will find yourself

00:00:49

on the main page.

00:00:50

In recent years, they

00:00:52

have worked very well on this product, so the

00:00:55

interface has become much simpler and clearer,

00:00:57

and many configurations are used

00:01:00

automatically the first thing you need if this does

00:01:03

not happen automatically create a

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cluster here everything is simple all the options

00:01:09

are by default all you need to

00:01:11

do is select the sandbox tariff

00:01:13

so that everything is free after the

00:01:16

cluster is created you need to internally

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add a new collection for this click

00:01:21

on the collections button and create the new

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collection, in fact, this will be our

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database, in the pop-up window we set the name

00:01:30

for the database, since we created a blog, then

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I’ll call it not blog, but the name of the

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collection is directly the place

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where the data will be saved, so

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it must be selected in accordance with the

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stored type so that the name is

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descriptive in our example, I

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will call the collection post

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since it will store news data.

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After we have created the database and

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collection, we need to create a user

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who will have access for

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manipulation. To do this, click on the

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database access tab

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and either create a new user or

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we edit the existing one

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as an authorization method, select a

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password, the name is set automatically

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from the name and name that you specified during

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registration, you need to come up with a password,

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by the way, if it is very simple, then you

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will receive a message about this and you

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will need to change it; as an example, I

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will set the password pass 321, the last thing that

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remains select

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this role, it can be left as administrator by default,

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or it can be changed to read and write or

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read only,

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that is, depending on the selected options,

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the user will receive either full access

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or partial access to

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data manipulation after the user is

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created, we can begin integrating the

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database into our application to begin with,

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since we are working with manga, we will

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need to install mangus

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since we cannot access the database directly,

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this can be done with the command npm install

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mangus after installation, we import it into

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our server, now we return back

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to the manga website,

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go to the cluster st tab and

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click connect button

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since we will connect through

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the application, we select this option in the

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window that appears, we will see the

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line that we copy and transfer in the

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application, create a debi constant where

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and assign the copied connection string,

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please note that this is not fully

00:03:37

configured, the line

00:03:39

that can be used

00:03:41

says the same thing message under it we need to

00:03:44

set the password field

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and I’ll remind you we defined it as pass 3

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2 1 and also replace my first date a

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bass with the name of the database that we created this

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value

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is not a block and now we can already

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establish a connection for this we

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use mongus which we imported

00:04:03

earlier and in particular the method connect

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inside of which we pass the debi constant

00:04:08

since this is also an asynchronous operation

00:04:11

we can use the dream methods to

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flow inside the essay console you see

00:04:17

a line stating that we have successfully connected

00:04:19

to the

00:04:20

cash database if we have an error and

00:04:24

by the way it will appear We’ll also display it in the

00:04:26

console, just in case; we’ll stop and

00:04:29

restart the server; the message is

00:04:32

not displayed in the console right away, since

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the connection is being made first,

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but even after that we will receive a message;

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I deliberately did not create a

00:04:41

fully prepared request so that you can see the

00:04:44

whole process; the message says that

00:04:47

we Additionally, you need to pass the

00:04:49

user argument new

00:04:51

ural parser to connect, but that’s not all you can see in

00:04:54

the console, you can see another

00:04:57

warning as an additional

00:04:59

argument is required,

00:05:01

user uni fight the shelves, we add it and

00:05:04

now that everything necessary has been added,

00:05:07

a connection should occur, but here

00:05:10

we are too we see an error about access, in order to

00:05:13

fix this, we

00:05:14

return to the [ __ ] db panel, go

00:05:17

to the network access tab and edit the

00:05:19

existing connection,

00:05:21

click on the allow access from any button

00:05:24

and save the changes, that is, we

00:05:27

allow access not from a specific IP

00:05:30

address, but from any machine to this

00:05:32

saving will take a couple of seconds, but if we

00:05:35

did everything correctly, the console should

00:05:38

display the message connect and tu bi bi,

00:05:41

if this does not happen for you, then read the

00:05:44

error message or warning

00:05:47

and try to find the answer

00:05:48

yourself, as a result,

00:05:50

you should have established a connection

00:05:52

between the server and the database is

00:05:55

great, now let's move on to creating schemas. A

00:05:58

schema

00:05:59

is a kind of object that will

00:06:01

describe the data structure in the root of the

00:06:04

project, create a modus folder and

00:06:07

add the post file to it. jess inside this

00:06:10

file we will describe the scheme of our post,

00:06:14

first we import mongus and pull the

00:06:17

constructor from it and now we create a

00:06:20

constant post scheme

00:06:21

and assignment call the constructor inside

00:06:24

which we describe the object if we

00:06:27

go to the file server and look at the

00:06:30

structure of our post you will see what

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it contains fields such as

00:06:34

ideas, text, title, and so on, these are the fields

00:06:38

we need to describe

00:06:40

the properties of the ID, we don’t describe it since we do

00:06:43

n’t transfer it, it will be created

00:06:45

automatically for each added

00:06:48

entity, we’ll start right away with the text field,

00:06:51

its type, this line, we

00:06:53

can finish there but

00:06:55

in addition I will add an even more record

00:06:58

with the value true,

00:06:59

as you might guess, now the text is

00:07:02

required and properties, and if it is not

00:07:05

passed, there will be an error. Then we simply

00:07:08

copy the same construction for the properties

00:07:10

title and author, these are also strings, these are also

00:07:14

required fields as the

00:07:15

second argument to the constructor you can

00:07:18

pass a configurable object, I’ll

00:07:20

use it to pass the

00:07:22

time stands properties,

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this is exactly the one and the one that

00:07:25

will now be automatically assigned to any

00:07:28

created paste and in general the scheme is ready,

00:07:31

now this scheme needs to be applied to the

00:07:33

model for this I create a constant post the

00:07:36

name of the model is written with a capital letter just

00:07:39

like the name of the constructor, we assign

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it the value mongus mode inside of which

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we pass two arguments, the first is the name of the

00:07:48

model 2

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is the name of the schema that this model

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will use so that you can more

00:07:54

clearly understand how Mangus and

00:07:57

[ __ ] db are connected and also why use the schema,

00:08:00

look at the following figure,

00:08:02

as was said by manga debi, this

00:08:05

database that stores all information

00:08:08

directly with the database cannot be worked with because

00:08:11

as a result of incorrect implementation, a

00:08:13

situation may occur when the

00:08:15

stored data will be in different formats of

00:08:17

different structures with different types, to

00:08:20

prevent this from happening, an

00:08:22

additional layer is used between the server

00:08:24

and the database in our case, this is mongus, with

00:08:28

the help of it, firstly, we establish

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a connection and secondly,

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using models we can describe different

00:08:34

entities, for example in our application

00:08:37

this is a given posts and contacts model,

00:08:40

this is a wrapper around data of a certain

00:08:43

type that provides convenient

00:08:45

methods for working with this data by

00:08:48

type of reading all

00:08:49

or 1 change search or delete

00:08:52

each entity this set is available

00:08:56

and in turn the model is described

00:08:58

using a schema the schema is a

00:09:00

set of fields

00:09:02

whose types and their properties are defined

00:09:04

we return back to the code as the

00:09:06

final step we export the model

00:09:09

for this using the

00:09:11

export module assign the value to the

00:09:13

created model, go to our

00:09:16

server file and import the newly

00:09:18

created model,

00:09:19

look for the road post with which

00:09:22

we added data in the previous video and

00:09:25

slightly change its logic,

00:09:27

leave only the destructuring of the data

00:09:30

from the request using the post model,

00:09:32

collect a new post object inside the

00:09:35

constructors, pass the received ones to

00:09:37

request data after which we use a

00:09:39

simple

00:09:40

safe method, it is also asynchronous,

00:09:43

so we can process the incoming

00:09:45

result in zen using the rest method and

00:09:49

send the data to yuan, that is, if

00:09:52

everything is saved successfully,

00:09:53

we will see the saved data in the browser,

00:09:56

but in the oven we will intercept the error and

00:09:58

do additional redirect to the

00:10:00

error page, now go to the

00:10:03

browser to the post creation page,

00:10:05

enter the title, author's name and text,

00:10:09

click submit and voila on the screen we

00:10:12

see a response from mango to you that the

00:10:15

data was successfully saved,

00:10:16

this can be determined by the additional

00:10:19

fields ID

00:10:20

created it and update from from if we

00:10:24

will return to the manga and look at the

00:10:26

result, we see the sent data

00:10:28

as saved, and since all

00:10:31

the fields are marked as required,

00:10:33

we can try the negative case, that

00:10:36

is, send empty data, in this

00:10:38

case

00:10:39

we will be redirected to the error page in

00:10:41

the terminal, we will see the information that

00:10:43

we are trying send invalid data and

00:10:46

if we look at [ __ ] db then this

00:10:49

invalid data, since it did not pass the

00:10:51

schema check, was not added to the

00:10:53

database and today I still have all

00:10:56

the questions ask them in the comments and

00:10:58

you will find the lesson code in the course repository

00:11:00

link in the description see you in the next

00:11:03

video bye

Description:

Всех приветствую в курсе «Node.js». В данном видеокурсе мы с вами рассмотрим Node.js, серверную технологию которая позволяет исполнять код написанный на JavaScript вне браузера. Разберём базовые концепции и встроенные модули, которые активно используются при разработке сервера. Рассмотрим механизм коммуникаций между сервером и браузером. Создадим базовый роутинг на чистом Node.js. Подключем Express и перепишем роутер. Научимся работать с динамичными данными с помощью шаблонизатора Node.js. Напишем новостное приложение с поддержкой CRUD операций и хранением данных в MongoDB. Создадим свой API по возврату данных из БД. И в заключение, загрузим готовое приложение на Heroku. ✒ Репозиторий курса: ✔ GitHub: https://github.com/YauhenKavalchuk/node-js ✒ Полный список готовых и планируемых курсов: ✔ Trello: https://trello.com/b/R6rD7qq8 ✒ Автор курса: ✔ YouTube: https://www.youtube.com/YauhenKavalchuk ✔ Instagram: https://www.facebook.com/unsupportedbrowser ✔ Twitter: https://twitter.com/YauhenKavalchuk ✔ VK: https://vk.com/YauhenKavalchuk ✔ LinkedIn: https://www.linkedin.com/in/YauhenKavalchuk ✔ GitHub: https://github.com/YauhenKavalchuk ✔ VK (Группа): http://vk.com/webdevcom ✒ Поддержать развитие канала: https://github.com/YauhenKavalchuk/youtube/blob/main/sponsoring.md

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