Busy building a website for a client using classic ASP (It will reside on an old server) which is going to be used internally only.
The admin is able to view a paginated table of data and export this to CSV. This works fine when I save the CSV data to a CSV file but I have now been asked to try avoid the creation of the file if possibly and create the CSV in memory without the need for a file.
I have my doubts that this is possible but might be completely wrong. Is there anyway to send the CSV data to the browser such that it will open in Excel rather than having to create a CSV file and link to it as I am currently doing ?
TIA
John
Response.ContentType = "text/csv" will help you here. In the past I've paired that with a rewrite rule so that the URL is something like foo.com/example.csv but there are plenty of other ideas to be found in the following question: Response Content type as CSV
Related
A table containing almost four thousand records includes a mediumblob field for each record that contains the record's associated PDF report. Under both MySQL Workbench and phpMyAdmin the relevant DOCUMENT column displays the data as a BLOB button or link. In the case of phpMyAdmin the link also indicates the size of the data the Blob contains.
The issue is that when the Blob button/link is clicked, under MySQL Workbench opening any of the files using the SQL Editor only displays the raw Blob data and under phpMyAdmin th link only allows the Blob data to be saved as a .bin file instead of displaying or saving the data as a viewable PDF file. All previous attempts to retrieve the original PDFs using PHP have failed - see related earlier thread: Extract Pdf from MySql Dump Saved as Text.
The filename field in the table shows that all the stored files are PDF files. Further research and tests indicate that the mediumblob data has been stored as application/octet-streams.
My question is how can the original PDFs be retrieved as readable PDFs? Is it possible for a .bin file saved from the database to be converted or used to recover the original PDF file?
Any assistance would be greatly appreciated.
In line with my assumption and Isaac's suggestion the only solution was to be able to speak to one of the software developers. It transpires that the documents have been zipped using an third-party library as well as the header being removed before then being stored in the database.
The third-party library used is version 2.0.50727 of Chilkat, available from www.chilkatsoft.com. That version no longer appears to be available, but hopefully at least one of the later versions may do the job.
Thanks again for everyone's input and assistance.
Based on the discussion in the comments, it sounds like you'll need to either refer to the original source code or consult with the original developer to determine exactly how the data was stored.
Using phpMyAdmin to download the mediumblob data as a file will download a .bin file in many cases, I actually don't recall how it determines content type (for instance, a PNG file will download with a .png extension, but most other binary files simply download as a .bin when phpMyAdmin isn't sure what the extension should be, PDF included). So the behavior you're seeing from phpMyAdmin is expected and correct, but since the .bin file doesn't work when it's renamed to .pdf that means something has probably gone wrong with the import and upload.
BLOB data is often stored in a pretty standardized way, but it seems your data doesn't follow that method.
Without us seeing the code directly, we can't guess what exactly happened with storing the data and would only be guessing.
I am trying to upload a XML file to MySQl server.
I have a React web app, I am using Axios and NodeJS.
I was using the follwing statement to import the xml file to the product table directly from the workbench
LOAD XML INFILE "C:/ProgramData/MySQL/MySQL Server 8.0/Uploads/products.xml" INTO TABLE product ROWS IDENTIFIED BY <Product>;
It worked fine.
Now I want to have a button that will upload anew xml file and replace the existing data in the table.
What I tried so far is using the HTML input file element, grabing the file from the event.target.files[0] and sending the file object to the server with a POST request.
I am not realy sure how to go from here I cant find a statement that can import the data out of the file object and imoprt it into the sql table.
any ideas? what is the best way to go about it?
I figured out my problem, my site was deployed to Heroku.
Apparently the clearDB, Heroku's add-on sql database, does not allow the use of LOAD XML INFILE / LOAD DATA INFILE as said here - https://getsatisfaction.com/cleardb/topics/load-data-local-infile.
What I ended up doing was converting the xml file to JS object.
That solution presented a new problem, my xml file was around 3MB summed up to over 12000 rows to insert to the database.
MySQL does not allow inserting more then a 1000 rows in a single query.
I had to split the object to several chuncks and loop through them uploading each one by it self.
This process takes some time to execute and I am sure there are better ways of doing it.
If anyone can shed some light on how best to go about it or provide an alternative I would apprreciate it.
I'm new to coding and its a lot of try and error. Now I'm struggling with html tables.
For explanation: I am building an Electron Desktop application for stocks. I am able to input the value via GUI in an html table, and also export this as Excel file. But, every time I reload the app, all data from the table are gone. It would be great to save this data permanently, and simply add new data to the existing table after an application restart.
What's the best way to achieve this?
In my mind, it would the best way to overwrite the existing Excel file with the new work (old and new data from the table), because it would be easy to install the tool on a new PC and simply import the Excel file to have all data there. I don't have access to a web server, so I think a local Excel file would be better than a php solution.
Thank you.
<table class="table" id="tblData" >
<tr>
<th>Teilenummer</th>
<th>Hersteller</th>
<th>Beschreibung</th>
</tr>
</table>
This is the actual table markup.
Your question has two parts, it seems to me.
data representation and manipulation
data persistence
For #1, I'd suggest taking a look at Tabulator, in particular its methods of importing and exporting data. In my projects, I use the JSON format with Tabulator and save the data locally so it persists between sessions.
So for #2, how and where to save the data? Electron has built-in methods for getting the paths to common user directories. See app.getPath(name). Since it sounds like you have just one file to save, which does not need to be directly accessible to the user, appData is probably a good place to store it.
As for the "how" to store it – you can just write a file to that path using Node fs, though I like fs-jetpack too. Tabulator can save data as well.
Another way to store data is with electron-store. It works very well, though I've only used it with small amounts of data.
So the gist is that when your app starts, it loads the data and when the app quits, it saves the data, along with any changes which have been made, though I'd suggest saving after every change.
So, there are lots of options depending on your needs.
I am in the process of starting a project and i want to understand the best way to automate the creation of a text/CSV file containing the result of a request. And each time the database is updated, i want that file to be updated too. I'm using LibreOffice Base.
Hay,
LibreOffice Base is not going to help you in this case as it is just a GUI tool for querying a Connected DB.
I would look at getting your backend to append to a log/CSV file every time it receives a request and successfully obtains/manipulates data in the Database.
I was wondering if it's possible to open a local JSON file so I can just check its structure? Didn't/don't want to upload the file to an online JSON format checker site and was hoping I can just utilize PAW to do that.
Don't seem to be able to do this with a local file, unless I run it through a local server, eg using MAMP, unless I missed something...?
Thanks.
You could copy the content into the txt body then switch to the JSON body this will let you view it in the nice structure, sorry currently no way to directly import a file need to copy past the content.
Take a look at jsonlint npm module. Supports JSON schema validation and pretty printing.