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Please recommend free visual modelling tool with reverse engineering feature if such exists.
I've been happy with SchemaSpy for visual modelling. It produces handy reports on the DB structure and relationships, good structural diagrams, and more. See these sample pages from a simple demo database, including this structural diagram . It also has the handy ability to produce smaller structural diagrams specific to each table, showing relationships with that table by one or two degrees of separation.
SchemaSpy works great with PostgreSQL. Just make sure you put the path to the PgJDBC driver jar on the SchemaSpy command line as -dp /path/to/PgJDBC.jar.
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Closed 8 years ago.
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I need a NoSQL database to store our files with following specification:
easy Clustring
Distributed
Automatic failover
easily scalable
Fast
I have searched and find some solution like "MongoDB GridFS" or "Riak" but i think i have to research more in both requirement (download server requirements) and solutions.
Has anybody any experience in this fields?
From my (experienced) point of view there are no obvious reasons against MongoDB GridFS. If your files are below 16 MB of size each, I would even store them in a MongoDB collection directly.
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I have been using database project in Visual Studio 2010 to maintain/version control database schema and are quite happy with that since I can also use VBDBCMD to deploy the version controlled schema to any database instance quite easily.
Now I need to work with PostgreSQL and I am wondering if there is any tool similar to the "database project" thing in Visual Studio to help version control database schema as well as schema deployment.
Thanks.
The closest thing I could suggest would be Eclipse with the Toad plugin.
In general, shopping list questions are disfavored on Stack Exchange sites because they tend to solicit opinions and tend to go out of date quickly.
The other option is to use a source code management solution like git or subversion, and then just use your standard text editors on the SQL files. This is what we do in the LedgerSMB project.
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Is there a tool that takes a short Lisp code snippet and then generate a series of box diagrams to represent state for each step of the code?
I am thinking of something like this: Online Python Tutor.
Something like this can be good for answering newbie Lisp questions. A lot of newbie questions are based on confusion on one or more of the following:
implications of pass by sharing
shared structure
destructive functions
all of which can be demonstrated easily and visually by invoking such a tool. I wouldn't have to draw a box diagram to help a fellow newbie, I could just generate the diagrams by feeding the newbie's code or my example code into that tool. I wouldn't have to hope that the newbie would know words like reference, same object, different object, object identity, fresh cons, because the diagrams would tell the whole story, even help explain what those words mean.
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is there any well written perl open source out there (not using any kinda of framework) that i could use as sample for learning and good pratice of the perl...
I've searched around and found many things for PHP, but nothing in perl that uses no framework.
Thanks in advance.
Have you tried browsing CPAN? You can find code there doing pretty much anything, and many distributions post links to their github repositories, so you can follow along in the development process.
CPAN Ratings has reviews and rankings of a large number of releases, which helps you differentiate between good releases and bad ones, but being able to make this determination for yourself would be best, which you get through learning and experience.
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One of my projects needs to show users where they rank in certain calculations. I inherited the graph structure from the previous programmer and had to leave it alone while I worked on other parts of the site.
It's time to make the graphs more meaningful, so I'm looking for books/websites/etc about graphs. (Not graph theory!) Charts that convey comparisons at a glance.
Everyone suggests The Visual Display of Quantitative Information by Edward Tufte and that's spot on for what I'm looking for, so anything related to that would be great.
Naturally, personal experience about what to do or not would be helpful as well.
I found Stephen Few's book "Show Me the Numbers" very helpful.