I'm a newbie web developer.
I am trying to make my own web based text editor application thus I need this info.
How do I store text with line breaks in database.
I am thinking to use MongoDB.
Also, I'm interested in knowing:
What database YouTube uses to store comments?
What database stackoverflow uses to store comments?
Thanks in Advance.
When deciding what type of database to use for your own project, it is more important to keep in mind what features of that database that you may need for your own project.
YouTube and Stackoverflow both use SQL databases, but the result that you are trying to accomplish can be performed in a NoSQL database like MongoDB as well.
If you have a fixed schema and need to perform table joins in order to compile all of your data, a SQL database might be the way to go.
If your schema is more flexible and your data would benefit from document-based storage and loading, then a NoSQL database is the way to go.
Related
I am using MongoDB first time here. Is there any best way to transfer bulkdata from mysql into MongoDB. I try to search to in different ways but i did not find.
You would have to physically map all your mysql tables to documents in mongodb but you can use an already developed tool.
You can try: Mongify (http://mongify.com/)
It's a super simple way to transform your data from a MySql to MongoDB. It has a ton of support for changing your existing schema into a schema that would work better with MongoDB.
Mongify will read your mysql database, build a translation file for you and all you have to do is map how you want your data transformed.
It supports:
Updating internal IDs (to BSON ObjectID)
Updating referencing IDs
Typecasting values
Embedding Tables into other documents
Before filters (to change data manually before import)
and much much more...
There is also a short 5 min video on the homepage that shows you how easy it is.
Try it out and tell me what you think.
Please up vote if you find this answer helpful.
I have a web application in which we show a tree content to the user, like a JSON structured file. The user, through the web application can add comments for any key of the JSON. And the main functionality is to be able to chance the value for that key and to keep an history of changes.
When the user is done modifying the structure, he can publish its changes. The output then is the same JSON file but with the latest modifications for the values.
Which database engine fits better this application? We are currently using MySQL but have heard from other devs that NoSQL databases can be the solution here. Should we use MongoDB, CouchDB or any of those? How would you approach the database model?
Thanks!
I think that choosing the database depending on your model is not the right approach. Choose your database on your availability/scalability/simplicity requirements and then figure out how to fit your model in the database you choose.
Is there any good way to migrate existing database from Domino Server to Relational database like MySQL without using any tool.
I've explored a bit about this and got to know that its possible using XML but don't know how and what'll be the procedure.
Any help would be appreciated.
Without using any tool: NO.
There are two big difficulties in exporting data:
First is the Notes Richtext, which is a proprietary format that has to be "transcoded" somehow. This is not an easy thing to do "manually" and needs either a lot of coding or some kind of tool.
Second is the fact, that there is no "forced" structure in Notes documents. There can be several forms that "define" how the documents look and there can be different versions of these forms that have been used over the past. A document may or may not contain any number of fields in any thinkable type (the field may even be number in one document and text in the other).
You have to KNOW the structure of your documents to get them out. Of course you can simply export them as "Structured Text" or as "Comma separated values", to get -most- of it, but then you need views that show the documents in the order you need them. Exporting them as XML is another "standard" way to get the data, but then you need to understand the xml to get it into your relational database.
Short: Without (at least very little) coding knowledge OR a tool (that costs money) there is no chance for getting the data out.
Ah yes, there is an "ODBC driver" for Lotus Notes / Domino, but that will not help you much, if you do not know the structure of your documents and how Notes- Databases work, it will also not work.
As Torsten said above, you can't do it without a tool, either you buy one or write one yourself.
I wrote a tool like that several years ago to export Notes databases as XML. There is a bit of work, especially with the rich text fields. You also may want to export/detach attachments and embedded images.
You can read more about my export tool here: http://www.texasswede.com/websites/texasswede.nsf/Page/Notes%20XML%20Exporter
I need help from you experts about practices regarding database development. I have a few questions regarding MySQL databases:
Is there a way for MySQL that a database and its structure is developed in an XML language and then converted to a fully functional MySQL database?
Is it possible to generate the XML source file from question 1 (see above) based on an existing database in MySQL ?
As far as I know, XML is not suitable for developing database structures. However can we say that XML is a language to demonstrate hierarchical structures and a MySQL database also shows a hierarchical structure, so in fact it is suitable for database development?
Thank you very much!
You can certainly store XML data in MySQL. You can also use any number of approaches to converted hierachical XML data into individual relational database field representations.
I would however say that if you just want to work with intact XML documents, you might look to go the NoSQL route, which is really better suited for this type of data storage. You also might consider JSON as the format for storage as it is more concise (saves space and transmissions badnwidth) and is more aligned with the popular NoSQL data stores out there.
1) yeah there is a way, but you should check out mongodb if you want a dynamic database structure, it was developed with that in mind. also, unless you need the rss features of xml or something similar, you might want to consider using json as a format for you documents.
2) json and mongodb work very well together to quickly and easily get documents in and out of the db. you can technically do it in mysql as well, but you might spend more time scripting in php or ruby to get the desired format you want.
3) you could use xml to demonstrate your db structure because of it's loose structure, but i'm not sure it would be intuitively clear to others. hard to say, really depends on how you implement it and how complicated your db structure is going to be.
I have a few XML files containing data for a research project which I need to run some statistics on. The amount of data is close to 100GB.
The structure is not so complex (could be mapped to perhaps 10 tables in a relational model), and given the nature of the problem, this data will never be updated again, I only need it available in a place where it's easy to run queries on.
I've read about XML databases, and the possibility of running XPATH-style queries on it, but I never used them and I'm not so comfortable with it. Having the data in a relational database would be my preferred choice.
So, I'm looking for a way to covert the data stored in XML into a relational database (think of a big .sql file similar to the one generated by mysqldump, but anything else would do).
The ultimate goal is to be able to run SQL queries for crunching the data.
After some research I'm almost convinced I have to write it on my own.
But I feel this is a common problem, and therefore there should be a tool which already does that.
So, do you know of any tool that would transform XML data into a relational database?
PS1:
My idea would be something like (it can work differently, but just to make sure you get my point):
Analyse the data structure (based on the XML themselves, or on a XSD)
Build the relational database (tables, keys) based on that structure
Generate SQL statements to create the database
Generate SQL statements to create fill in the data
PS2:
I've seen some posts here in SO but still I couldn't find a solution.
Microsoft's "Xml Bulk Load" tool seems to do something in that direction, but I don't have a MS SQL Server.
Databases are not the only way to search data. I can highly recommend Apache Solr
Strategies to Implement search on XML file
Keep your raw data as XML and search it using the Solr index
Importing XML files of the right format into a MySql database is easy:
https://dev.mysql.com/doc/refman/5.6/en/load-xml.html
This means, you typically have to transform your XML data into that kind of format. How you do this depends on the complexity of the transformation, what programming languages you know, and if you want to use XSLT (which is most probably a good idea).
From your former answers it seems you know Python, so http://xmlsoft.org/XSLT/python.html may be the right thing for you to start with.
Take a look at StAX instead of XSD for analyzing/extraction of data. It's stream based and can deal with huge XML files.
If you feel comfortable with Perl, I've had pretty good luck with XML::Twig module for processing really big XML files.
Basically, all you need is to setup few twig handlers and import your data into MySQL using DBI/DBD::mysql.
There is pretty good example on xmltwig.org.
If you comfortable with commercial products, you might want to have a look at Data Wizard for MySQL by the SQL Maestro Group.
This application is targeted especially at exporting and, of course, importing data from/ to MySQL databases. This also includes XML import. You can download a 30-day trial to check if this is what you are looking for.
I have to admit that I did not use the MySQL product line from them yet, but I had a good user experience with their Firebird Maestro and SQLite Maestro products.