To begin with, I set up my database which includes (an id (which is auto increment), username, email, and 2 more which are place0 and place1 (those two are boolean type)). Now my question is how can I connect an esp8266 directly to the database and update the booleans from 0 to 1 and back using a button for each one? Also, how can I read the boolean on the esp and turn an led for example? I need to make it update the values for a selected user not all of them....for example, I have users with id 1, 2, 3...i need to make the updates only on 1 if that one is selected...
Note that both the database and the esp8266 are in my house (on a local network)
Thanks very much
Nikolaos Konstantinou
NcCon
The best way I can think of is ESP8266 to Web Server(PHP/Python/NodeJS etc) to MySQL
Send the boolean values in the form of the HTTP Post method and handle the post method in Webserver then update the MYSQL table.
check out this link
For some reason, if you want to avoid webserver you can try micro python upymysql module which helps to directly communicate the database from ESP board uPyMySQL
Related
I am new to Jmeter and trying to carry out the following flows:
User Login with username and password
Page 1 is displayed with 10 invoices - User select ten invoices -
10 ajax call is executed (invoice1, invoice2,invoice3.. json file is generated with invoices as request)
Page 2 is displayed to view invoices
User log out
I have recorded the flow with blazemeter plugin on chrome.
The thread group in Jmeter has the following tasks:
I have 10 users in a file called users.txt and i am using CSV Data
set config to load them.
For each user I will load only 10 invoices from invoices.txt using
CSV Data set config to load them.
Since I have 10 users and each user needs 10 invoices, my
invoices.txt has 100 unique invoices.
Please find csv config for invoice below:
The problem is that I need each user to be assigned with 10 unique invoices and those 10 invoices cannot be allocated to another user.
Any idea how I can load 10 unique invoices for each user and make sure those invoices are not assigned again to another user?
invoices.txt should have only unique IDs before test start, you can share the IDs using:
CSV Data Set Config inside loop of users with attributes:
Sharing mode - All Threads - ID won't be repeated
Recycle on EOF? - False - for not to get invalid Id (<EOF>)
Stop thread on EOF? - True - Stop when file with unique IDs ends
You can consider using HTTP Simple Table Server instead of 2nd CSV Data Set Config.
HTTP Simple Table Server has KEEP option, given you set it to FALSE each used "invoice" will be removed, it will guarantee uniqueness even in case when you run your test in Distributed (Remote) mode
You can install HTTP Simple Table Server (as well as any other JMeter Plugin) using JMeter Plugins Manager
Okay, I know this question has been half answered around here, but I'll explain in full and see if there maybe a better way to handle this then in just two parts.
I'm building an HTML5 voting site, that will close voting every half hour. And then open a new batch of voting.
What I need to do, is have the URL of this site be 'masked' ie:
have a random URL for it be generated that leads to the same location- so say I'm directing users to voting.com, I want them to only access it via the url votingstuff.com/hg67, and have that end portion be changed every half hour- and once the new url is generated, remove access to the site via the old URL.
I might add that after the user votes, I'd also like to close their voting access until the new URL is posted. AKA- everyone only gets one chance to vote.
Thoughts? Libraries to check out? Sites that do this? I know the randomization has been answered a few times, but usually it's a generator led to by a page, I want to START with a randomly generated URL, and not have a page that creates it as a function. I may have to write code that generates the page I guess?
Here is an approach I can think of -
You don't need to handle multiple URL's, you can achieve this on the same URL itself by enabling/disabling access to the URL content every hour.
You will need some action on your application/server side as well. For reference lets assume you have a PHP server running. You will need some table that holds a status setting for you, something like this -
Settings Table
id settingCode value
=============================
1 votingOpen 1
You will also need to setup a cron job on your server that will run every half an hour. The cron job's task would be to run every half an hour & change the value of the votingOpen to its inverse. So assume open your votings, initial value of the votingOpen field would be 1 i.e the first half an hour of voting starts.
Along with this you will start the cron job as well. Now what will happen is that after half an hour the cron job will fetch the value of votingOpen read it & if its 1, it will change it to 0 & if its 0 it will change it to 1. This will happen every half an hour on your server.
Now you need to make this votingOpen variable accessible on your client side code using a simple query to fetch its value. On each render of your voting page, on top somewhere you can check this value & if its 1 i.e true, you will write the logic to go ahead & show the voting page. But if its 0, you can redirect the user or show a different message on that page.
Lets say your voting happens on http://somedomain.com/voting, on the render logic of this page you can do something like this -
Voting View Logic
<?php
$votingOpen = {some database query that fetches the value from the database};
if($votingOpen) {
// your voting view resides here
} else {
// either redirect user to some other page
// or show some message like voting is closed on this same page.
}
?>
Limit multiple votes from one person
Normally the best way to handle this is a combination or registered user only vote + cookie/localStorage + IP tracking
But if you don't have registered user voting, you can still capture IP of user & allow only one vote per IP and you can also set a cookie or a localStorage variable in the users computer so he can only vote once.
Hope this helps.
Ref for Cron Job - http://code.tutsplus.com/tutorials/managing-cron-jobs-with-php--net-19428
I have a MySQL database, and i created a DB and named it 'PERSONDB'. Within that DB, i have created a table and named it Person. This table has 3 fields. id,name,age.
Now i need to save some values from my flex website to the mySQL 'PERSONDB' that i created.
How can i do this in Flex (Flax builder 4.6)
Note: I have added 2 fields name and age, in the Flex project and when the user clicks on the Button i need those values to be saved in the DB. how can i do this.
asSQL ( http://code.google.com/p/assql/ ) is a good approach to using mySQL. It allows for direct access to mySQL from any application either in AIR or web based. I use this pretty regularly in my coding so I don't have to write a Java or PHP as a back end unless there is a good reason to have a back end in place.
OK, here is the code I use:
<assql:MySqlService id ="DB"
hostname ="localhost"
username ="user"
password ="password"
database ="db"
autoConnect="true"
connect ="handleConnected(event)"
sqlError ="handleError(event)"/>
private function getSelectedData() : void
{
DB.send("SELECT * from table WHERE number = '" + number.text + "'");
}
That's all there is too it. The top part sets up the connection and is in the section of the code. The rest is in the part (ActionScript). Of course, it can be done in straight ActionScript as well, but this solution used MXML.
I have been trying to insert a huge text-editor string in to my database. The application I'm developing allows my client to create and edit their website terms and conditions from the admin part of their website. So as you can imagine, they are incredibly long. I have got to 18,000+ characters in length and I have now received an error when trying to add another load of text.
The error I am receiving is this:
ADODB.Command error '800a0d5d'
Application uses a value of the wrong type for the current operation
Which points to this part of my application, specifically the Set newParameter line:
Const adVarChar = 200
Const adParamInput = 1
Set newParameter = cmdConn.CreateParameter("#policyBody", adVarChar, adParamInput, Len(policyBody), policyBody)
cmdConn.Parameters.Append newParameter
Now this policy I am creating, that is currently 18,000+ characters in length, is only half complete, if that. It could jump to 50 - 60,000! I tried using adLongVarChar = 201 ADO type but this still didn't fix it.
Am I doing the right thing for such a large entry? If I am doing the right thing, how can I fix this issue? ...or if I'm doing the wrong thing, what is the right one?
Try to avoid putting documents in your database if you can. Sometimes it's a reasonable compromise, serialised objects, mark up snippets and such.
If you don't want to query the document with sql the only benefit is the all in one place thing. ie back up your db, you back up your documents as well, and you can use your db connectivity exclusively.
That said nothing is free, carting all that stuff about in your database costs you.
If you can.
have a documents table, User name for the file, and internal name in your documents directory, so the file name is unique in the file system, and a path description, if there could be more than one.
Then just upload and download the selected document as a file, on a get or set of the related database entity.
You'll need to dal with deployment issues, document directory exists, and the account you are running mysql daemon as can see it, but most of the time, the issues you have keeping documents seperate fromthe db, are much easier to deal with than the head scratchers you are running into now.
I am modifying my PHP network's code to have "user roles" like wordpress here is my plan so far
0 = registred non email verified user
1 = registed and verified email
2 = moderator
3-9 = nothing yet
10= admin
In my PHP code I will use an array like this that will set what a role number does.
$user_role['10']
I was thinking of storing which value a user has in my mysql DB, would this be the best way to store the 10 different role options as an enum or is there a better way or faster way? I read that enum is not the fastest sometimes.
enum('0','1','2','3','4','5','6','7','8','9','10')
I guess INT or TINYINT is enough to store user level (role). Also you may consider multiplting the numbers by 10, so you'll have a space to add more levels in future.
Use bitmasks for permissions / user levels.
See example.