I have come to understand that excel files(.xlsx) files are essentially xml file archives internally. I even tried verifying this by extracting the xlsx file in my local.
So if that's the case, how exactly are excel files stored and what is the structure and how do they work.
I also know they can be parsed by SAX parser of Apache POI API.
Please help
Related
I can't use e.g. external tables or any other ways to upload data than saving .xlsx file as a blob in database.
Structure of xlsx file will always be the same, is it possible to read data from blob column as a table?
The best article about it: https://jeffkemponoracle.com/tag/xlsx/.
There are several ways / tools which can help you.
If you can't use any of it, you can consider using oracle's embedded ZIP and XML tools (xlsx is the zipped folder with xml files which you can parse)
If you have Oracle APEX you can consider also this: https://docs.oracle.com/en/database/oracle/application-express/20.2/aeapi/APEX_DATA_PARSER.html
How could I access the source code of a .one OneNote file?
I've tried to rename the .one file to .zip as what happens with .doc files in order to access their source code, but .one doesn't seem to work like that.
Also, I've tried to open it with Notepad++, but it isn't in a plain-text format.
I regard this as a programming question because:
I'm using content-editing-automation scripts (e.g. RegEx-related find and replace scripts). Accessing the source code of .one files helps me apply bulky automated edits on their content Using RegEx.
.one files aren't technically source code - they contain the data that describes the pages in a section and their content.
Opening them as text won't show you anything meaningful as they are binary data.
Microsoft has released the way this data is structured in .one files in the following documentation. You can use this to parse the binary file to obtain the information you need.
https://msdn.microsoft.com/en-us/library/dd924743(v=office.12).aspx
https://support.office.com/en-us/article/File-format-changes-in-OneNote-2016-for-Windows-a9129622-1755-470b-91e7-b2a461194036
The .one file format is super-complicated as it has to store images and all revisions, so it's binary and not XML-based like the rest of the office suite
That said if you do want to see the XML structure of the notebook or specific page content you can use OMSpy:
https://blogs.msdn.microsoft.com/johnguin/2011/07/28/onenote-spy-omspy-for-onenote-2010/
It works fine for 2016 Desktop.
I am working in building a project management tool,using MEAN(Mongodb,Expressjs,Angularjs,Nodejs) Stack.
I have a requirement in my project, where users will upload any kind of excel or csv format file and i need to parse each row from the file(excel|csv) and map it to my database model and save it has a mongodb document.I am trying to find an excel and csv parser library to accomplish my task.I also came accross xlsx, it looks good but it doesnt support reading csv files.It will be really helpful if any one could suggest a node.js library that can read all kinds of excel and csv file formats efficiently.Thanks in advance
At one point, I used Node CSV https://github.com/wdavidw/node-csv
to get the data inputted, it's really easy to use. Most of my users were fine with just having the CSV format option.....but you could combine the functionality of each library depending on the file type entered.....
If we have been provided only the XMLs of the document (in input stream, unzipped manner, or in a byte array), can we detect the file extension via parsing XMLs? My motive is to know what particular node in which XML determines that this is DOCX, PPTX, or XLSX file?
I unzipped the documents and tried to dig and found this -
In \docProps\app.xml, application node defines it -
<Application>Microsoft Excel</Application> for Excel,
<Application>Microsoft Office PowerPoint</Application> for PowerPoint, and
<Application>Microsoft Office Word</Application> for Word.
I plan to use Saxon for an XSLT problem. I need to run my program on a schedule. When it runs it needs to select all CSV files from a directory. The number of files can be random but once processed they are cleared from the folder by another process. Originally there was only one CSV file with a fixed name so referencing it in the XSLT wasn’t a problem. I could also programmatically set the filename at runtime so all was working well. My XSLT now needs to know about all the files so I can output a single XML. I’m not sure if I can pass in a file path and let the XSLT read in all the files at that location? Is there a command to do this or is there a better way to do this? Remember I don’t know how many CSV files will be in the folder when the XSLT is run.
See www.saxonica.com/documentation/sourcedocs/intro.xml, you can use the collection function to read in files from a directory e.g.
<xsl:for-each select="collection('file:///C:/dir/subdir?select=*.csv;unparsed=yes')/tokenize(., '\n')">
<line><xsl:value-of select="."/></line>
</xsl:for-each>