Mongoose + Express CRUD: Perform Create, Read, Update, Delete in MongoDB

Hello what's up guys today in this video we will see Mangus ka operation in our express application yes guys today's video is going to be very awesome because yesterday we completed how we can basically install Mangus in our express application How can we create a connection, we can also create a database, how do we create a schema, how do we create models, and then we basically inserted the data, basically we inserted a document, I told you, and at the end we closed it. So today we will see the complete code operation, so for that first of all I have another data, let's fill it in this way, okay so this data that you are seeing, it's an array of an object, inside which there are three such We have a lot of documents so first of all I will show you how you can insert all of them in one go because in yesterday's video I showed you that if you want to do a simple insert then I did it showed the butt What if you have multiple data like this and you want to insert it in one go then how can we do it, so now step one is to insert in the code operation, insert comes, right, here I go If you want, you can do it this way. I have different styles of commenting. So look, we have users, no matter what, and yes, you wait a second, I pressed insert, that's why this happened, so it's wait then. We have users dot look, if you want you can also write create, there is no problem but we have insert and then there is a method in which you just have to add the user data, this is it, this is all the users have to do Do it many and then whatever an array of an object, whatever multiple data you are showing, you can do it very easily only if you do this and do each thing one by one now I am commenting on it otherwise whenever I will see this I will run this data Isn't it so, this document will keep getting inserted but I don't want to do it, so you just have to insert this particular data of mine, basically it is a document, I will go here, okay, if I run it then you can see that Guys so many things are coming to me I mean this is kind of what I got the idea I will go here and refresh and total now I should have four documents and boom guys this is so awesome like one you In yesterday's video we showed you how you could do one but today we did all three in one go in Chutki, right? It's not a big deal, it's easy now let's go to our step two and that is a read now we You have to read it. Now here I will tell you multiple things and I will tell you one more awesome thing. If you remember, okay let's read the entire data. So users, now remember one thing. I have kept the usage here in small. because I had to go to Kasol We also have to show you by dialog what we are reading, okay so we have to write a wait and then we have a your dfy, if you remember directly if I was writing find then I was not getting the proper data basically We were getting cursor find so to show it properly we wrote to array. Okay, here also I will do the same and show you. Let's check it out users. Okay, I am going here and wait a second, now I will do one thing. This particular part, I am commenting on it for a while because then I have to show the complex data, I have to show only that and boom guys, now I will zoom it for you guys, so you can see that I have got some The data has come in the correct way, look your first data is fine, this is your second data and what happened here throw new error duplicate key error collection aa ok ok ok the problem is what I told you whenever you run your application You do whatever you have written here It tries to execute it again now I have inserted many I have looked again I forgot to comment now what happened is that our email id is visible this is the advantage of your schema what have we mentioned in the schema that our email ID it must be unique it must be unique so here the same problem is coming that duplicate error means that brother we will not be able to insert the same data again because we need the email to be unique but this is already this Email or this or this already exists so what do we have to do we don't even have to add it this is the beauty that it is not letting us add useless data again and again now let me go here, let me do it for now hm clear and I run and that one second one second c2 array is not a function now I want to tell you one thing that I had written it intentionally I had written it intentionally I thought maybe the data would come but what I mean is This was when you were working on Mongoose. No now you don't need to type to array, you don't need to write it at all, Mongoose is so powerful that it automatically converts it to array and returns the data to you, otherwise how would we get data without to in [ __ ] DB I was not able to find the boom guys see how awesome it is look at this it has come one two this twoti has become 4 how easily we read it na no it is a bit complicated so what can I say it is easy but kind of it may seem a bit tricky to you It could be so let's for example we have an age of 35 30 25 and then 31 let's do one thing, those whose age is more than 30, you display it, let's do this query, then it will be fun, okay so I will go right here, cost users Now comment on this, it is not neat, wait look carefully, wait again we have users do not find, okay now inside this, first of all what do you want, A C is greater than 30, so you will have to write here, as, then you We'll have to give a column, okay, as and then colon simple and we have to write it inside the curly braces. Then, now when you're using any operator, the comparison operator, now we're going to apply it here, so I'll again use another curly braces. I will give you where you will have to pay dollar and then GT greater than and then again colon and then write 30 this is it, that's all you have to do and one thing I would like to tell you is that if you are not getting any idea here then I I would highly recommend that here we have a course, come to the courses section, it is fine, the complete web development course, basically the full stack development course, ATML CSS JavaScript BOOP 15 Interview Questions of JavaScript React and Node and Express is still going on That's why I did not add it, but the complete Mango DV course is available here. Here I have told you about A to Z, comparison operators, logical operators, aggregations, cursors, indexing, I don't know what all, I myself have forgotten it, if I tell the truth. But I have done everything here with full animations with projects, I highly recommend it, do check it out once, I will be very happy, please comment and share it with friends too, so we have done a lot of this there, greater than less than greater than and equal to this, I don't know how much it was but if you do this, okay, where earlier I was getting four outputs, now how many results are coming, let's see one or two, look, I am getting only two results now because of this The edge is greater than 31. Its edge is greater than 30. So it's a 35 and than 31, both of which are above 30. I did not get any results. So this is how awesome it is. So we have completed our read operation as well. So let's go with step three where we will see the update now guys look at this very carefully here also you guys might find a little trick I mean you might find it and whenever you go to update then by setting the dollar, this is the method you have to use Okay, after setting the dollar, then how to write 'const updated' so await, no matter what users, now pay attention here, now there is no find sign here, here simply you do update and one, update one or even if you just write update, it will work. Let's check it out what it is. Okay, this is how we will learn one by one. Yes, there will be update one. This update will be the main one. Now let's go for the update. I have made it clear, but it is an update and update one. Pay attention when you update. What are you doing first of all what do you need that which one do I need to update give me some braces here you will write those things a unique identification I mean first of all you have to find out kind of query you can understand it will come under this and then The value with which you want to update will come inside this, okay, so first of all what do you want to update, whoever has the email, basically the email is going to be unique for everyone, so this Bob one, let me do one thing, or this Bob yes i will copy it okay so if i email it for one second then as it is it will work but this This string should be like this, so if in my collection user collection, anyone whose email ID is this, I want to increase his age by one, okay, so you will have to write set, then colon and then again this The method is simple now what will you do here, the age of it is okay that will be you can either write h p 1 something like this and leave it because I don't have any idea what the judge is right now, I am just telling you, you can do it in this way You can copy this, let's paste it and I am commenting on this as well and I cannot paste that, I want to paste this, okay so guys, you can see it very clearly here that in this method, we cannot increment. You can do it and age is not defined, we are getting it so I will tell you one thing, when you write the set, then you should not do this, one second, what is its age, it is 30, let me make it 32, you can do this. You can do this okay I'm going here okay so user dot update is not a function this is it I wanted to show you that the update will not happen, it's update one, okay, now there's no problem, that means now you know that in Mongoose, you can't just write update, otherwise you need to write update one and update many, so I'll go here. I am doing this and friend this is it acknowledged true modified one and leave all this match count one okay modified is done match one means our work is done so now if I go here look carefully Bob whose age was 30 now I press ref here, the value of Bob is 32, so guys you can update in this way and you came to know that we need to write update one, just writing update will not work but you can do it in your mind You might be wondering can I increment it. Yes, we could have incremented it, but for that I am commenting it out. Look, dollar set, I have to set its value. It is evident from the name itself. Now, we cannot set it. Now baba, I want an increment, so for that you will have to You will have to write INC and then again it is the same thing, edge by one, so now what is happening here is that you are incrementing this edge by one, if you write two then it means whatever is the current A T current judge plus two increment okay let me just flip it because right now it's 32 32 will basically become 37 37 okay so I'm saving control A there's no other difference one second yes okay let's go here alright same thing came It means that what was 32 a while back, now if I refresh it will become 37 and today in this video I showed you how you can set the update, how you can increment the value, how you can decrement it You think for yourself and if you have to see it then I have already told you how to find out the decrement so do check out this video, okay you will find everything, isn't it so awesome that we have done code operation through Mango DB also looked at Now we are looking through Mangoes and let me know in the comment section whether you find Mango DV easier or this one easier, so guys this is also my work, now let us do this as well Comment now the last final step fur and that is to delete okay this is how we can do it now let's check it out here let me do one thing I will copy this and paste it here and I will see this There is no need for that because it will be very easy here because now we just have to delete and whom to delete will depend on it here, delete one, okay now I know that just writing delete will not work Here delete one and delete many, okay delete one users and here delete the deleted user whoever has the email id, simple poor guy, with this we have updated so much, now we are deleting this, whoever has this email id, delete it. two now what should the poor guy do now we end or acknowledge true deleted count one end where earlier You can see here we have a total of four documents now at the moment I refresh now it's your only three documents because we have deleted the one which was Bob so guys this is it that's it for today's video. I hope you had a lot of fun because we understood each and every thing with so much love, we saw each and every thing, I even made mistakes deliberately at various places so that you can know that okay this is not this, okay this is not this, only then we can understand the things I will learn otherwise you will just copy paste whatever is there and you will never know whether there was an update, whether there was one update or many updates, or whether there was any update at all. You are not understanding that to increment, should I increment in the set itself, the age is not coming here. Or the increment is separate, how are you understanding it, look at this, here the dollar sign is coming for greater than, elsewhere the dollar sign has come in this way, otherwise the more you practice many things, the more you will You will keep on understanding okay but ya guys this is it today in this video That's all for you, I hope you would have liked it very much, we understood each and every thing closely, the complete Cud operation is done, what else is needed in it, this is mostly used everywhere else, okay. But if you want to see it in depth, then I don't know why I am saying this again and again, but I want it to be as many views as I have worked so hard for, but if you watch it once, then share it with your friends. If you do it, it will help them as well as you, your money will be saved and you will also get to learn a lot, so please do check it out and tomorrow we will look at the middle way end Mangu which is very important, then we will give our URL I will tell you how you can deal with the short project and after that finally my sequel is going to come so it will be fun and guys if you are still watching this video then let me know in the comment section that I will tell you You like it more when I show my face while talking to you, you like it more openly Are you able to connect with me through my videos or whatever I did because I had gone to Nepal and I did not show my face? You are more interested in that. It seems more right to you. There is less destruction in it. You feel that If it is happening then let me know in the comment section whether I should show my face and I mean the one you can see me now or should I show you my normal self without camera, please do let me know by commenting that is also okay and please subscribe and Next target is 8 lakh subscribers, my channel is all dependent on you, okay so please subscribe and I will meet you in tomorrow's video till then guys, thank you so much, take care [Music]