Hey guys,
I hope you are good, I am fantastic today 🙂  I got my first mechanical keyboard, I feel awesome about it 🙂
Today I have very interesting topic for you. I will show you how to work with connect module and how to process response and request. I hope you enjoy it 🙂
Hey guys
I just uploaded a video on my YouTube channel, to show you how install MongoDB and create Database, it is a very short tutorial  but it can help you to understand some basic concepts of MongoDB.
YouTube link:
Bye bye
Hey Guys,
Now it is time to do some fantastic thing, normally connecting to database and retrieving data from database or writing into database is quite interesting if you are working with new platform and tools. Today I want to show you how to connect to the MongoDB and retrieve data (of course I will teach you how to insert first), for a few seconds forget about node.js and focus on MongoDB, in order to create a database in MongoDB we need to follow the below steps:
C:\MongoDB\Server\3.0\bin
After you moved to this folder key in the below command:
mongod –dbpath E:\node\notetest1\data
Note: Â dbpath is the address of data folder, so maybe your data folder address is different from mine, please change it accordingly.
Note: In some cases I saw that mongod does not work, so for this case you need to key in the full address of mongod.exe, actually mongod is exe file in bin folder!!!!
Note: it may take a few seconds to a few minutes for command to be finished so please be patient.
C:\MongoDB\Bin\mongo.exe
After you press enter you can see something like this:
To change the database you can type this command:
Use [name of you database]
Mongo DB uses Json data structure to keep data, so before we go further I want to show you how Json format looks like:
{“name”:”Mehran”,”code”:”123”}
{“name”:”Arash”,”code”:”234VF”}
{“name”:”Arman”,”code”:”EDRng”}
Basically json format is very simple and understandable for human.
How can we add record to our database?
In order to add records to your database you can use the below command:
db.insert.testcollection.insert({“name”:”Arman”,”code”:”EDRng”})
In the above command, testcollection is a user defined name for the collection. It means you can change it as you want. This collection looks like and array and keep all the records. Above command must be ran in mongo shell. (Same as step 5).
How can we retrieve records?
In order to retrieve data you can run the below command:
db.testcollection.find ().pretty ()
Then result is something like this:
{
“_id” : ObjectId(“55d1b2028f5be420d8a167fc”),
“name” : “Mehran”,
“code” : “123”
}
in the next post I will teach you how to retrieve data from MongoDb and show it Html file by using Node.js.
bye bye 🙂
Maybe it is very difficult for you to connect to the Json file and retrieve data, today I want to make it easy for you 🙂 Lets start.
Follow these steps:
"one": "Singular sensation", "two": "Beady little eyes", "three": "Little birds pitch by my doorstep"
<script>
$(document).ready(function () {
$.getJSON("Data/info.Json.", function (data) {
var items = [];
$.each(data, function (key, val) {
items.push("<li id='" + key + "'>" + val + "</li>");
});
$("<H1>", {
"class": "my-new-list",
html: items.join("")
}).appendTo("body");
});
})
</script>
GetJSON hast two parameters
$.getJSON("Data/info.Json.", function (data) {
4. Then we should add data to the array
$.each(data, function (key, val) {
items.push("<li id='" + key + "'>" + val + "</li>");
});
</script>
5. And in the last step we should add the HTLM codes that we generated in the previous step to the body tag.
$("<H1>", {
"class": "my-new-list",
html: items.join("")
}).appendTo("body");
});
And do not forget to add JQuery reference to your code , it coule be like this :
<script src="~/Scripts/jquery-ui-1.8.20.js"></script> <script src="~/Scripts/jquery-1.7.1.js"></script>
JSON (JavaScript Object Notation) is a lightweight data-structure format for data interchange, JSON could be read by human and it is easy for machine to generate and pars it.
When should we use JSON?
Assume you want create a service that retrieve data from DataBase and send them to the client. What will happen if your client use different type of machines and platform same as Smart phone, PHP website, ASP.net Website, different type of operating system. There are two solutions:
I am sure you are agree with me that the second solution is more logical.
In my opinion WebAPI could be a good choice for our scenario because, it can produce JSON output that is readable by all machines and platform and also it uses HTTP to transfer data that, also this protocol is well known for all.
Today I am just going to show you how you can create a simple JSON data structure but, In the future I will show you how create a WebAPI and call it by JQuery.
This is simple JSON sample, I declare an employee array that can carry different employees’ data.
{
"employees": [
{ "firstName":"Mehran" , "lastName":"JN" },
{ "firstName":"Arman" , "lastName":"Nas" },
{ "firstName":"Farzam" , "lastName":"ABS" }
]
}
I am going to do it in a JavaScript code:
<!DOCTYPE html> <html> <body> <h2>JSON Object Creation in JavaScript</h2> <p> Name: <span id="Name"></span><br> Family: <span id="Family"></span><br> </p> <script> var JSONObject = { "Name":"Mehran", "Family":"Jan"}; document.getElementById("Name").innerHTML=JSONObject.Name document.getElementById("Family").innerHTML=JSONObject.Family </script> </body> </html>
Coding Tips 