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Hi I am pretty new to NodeJS. I have worked with the MongoDB using the mongoose module. Now I am using MySQL for my current project and am trying to figure out the best options for ORM using MySQL. I have come across BookShelf.JS (with Knex.JS) node-orm2 and Squel.js
Has anyone used any of these or something else for a NodeJS MySQL/PostgreSQL/SQLite3 ?
Personally, I love Bookshelf. This question might be a little too subjective for SO, but I'll try to give a decent answer:
Knex is a joy. It's a straightforward interface, reminiscent of Laravel's query builder.
Bookshelf is a joy. It's a straightforward interface, reminiscent of Laravel's Eloquent ORM.
For most (not-too-big-and-probably-not-Node-appropriate) projects, Bookshelf/Knex will be all you need. They're easy to get running, and the codebases aren't too big if you decide that you need to work something out for yourself that isn't in the documentation.
Source: personal experience with a couple of the options. I've always found my way back to Bookshelf, though.
Take a look at Sequelize, I use it and recommend. It supports all databases you described.
Squel.js isn't a ORM framework, and it's very useful for complex queries, I use it with SequelizeJS.
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I want to write few process intensive back-end scripts for a web application using Perl and MySQL.
I will be frequently using embedded SQL in my scripts. Can anyone suggest a structured way to do that. I feel it will take lot of time to create generic classes for tables, if I have to use tables as classes and create functions like Add, Update or find to run Insert, update or select statements. Also such code itself will be quite vast than my actual business code. On the other side I do not want to use unstructured queries spread allover the code.
Are there any inbuilt class libraries to take care of my needs.
Any suggestions are greatly appreciated.
DBIx::Class is the best in class for an object-relational mapper in Perl. It will take care of all the SQL to add, update, delete and search and will do it efficiently. You tell it the tables, columns, keys and relationships. DBIx::Class::Schema::Loader can even do that part for you.
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I need to know whether there exists any technology to query both SQL Server and Oracle from single application and single query language.
From my limited understanding, and I could be misunderstanding your question, the technology you would use to query both MS SQL Server and Oracle would be:
SQL
...but with different connection strings:
https://www.connectionstrings.com/oracle/
https://connectionstrings.com/sql-server/
T-SQL is the procedural language for SQL Server and Sybase; PL-SQL is Oracle's procedural language.
The two databases have relational theory and SQL in common, but they're very different.
Trying to unify two relational database products into one is a fool's errand.
If i got you correctly you want to develop an application that you can switch databases successfully without much effort. If you are developing using Java you can use Hibernate JPA. It makes it very easy to switch your Application from one database to another with minimal changes and without writing a single sql query. I hope this is what you were looking for.
Hibernate(NHibernate for dotnet) or equivalent is the only choice.
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I am writing a database application in C linux. Currently I work on mysql but later we might migrate to postgres. Therefore my boss has asked my to prepare the application to be able to use either of the databases(mysql or postgres).
Is there a free api which I can use for this purpose? Or any suggestion on how best I can do this?
The official answer to that is ODBC.
If you don't like that (and let's face it, no one really does), Qt has a database access module, QtSql. Obviously, this will require you to make heavy use of Qt in your application.
If you can find drivers for your platform, ODBC was supposedly meant to provide exactly this: a platform-independent way to talk to databases.
(I say supposedly because in my experience, ODBC is such a mess that hooking up to an ODBC driver once turned out to be more difficult than just writing the code three times for three different databases.)
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I have searched the internet for drivers to connect to either database and all the projects I have seen have either been dead for a long time, look incomplete, or don't have good enough documentation to be usable without reading all the source.
Has anyone used Erlang to talk to either MySQL or PostgreSQL before and what sort of package did you use to do this?
Will Glozer wrote a nice native PostgreSQL client:
http://github.com/wg/epgsql
Yariv's mysql driver seems to be the best available: http://code.google.com/p/erlang-mysql-driver/
http://yarivsblog.com/articles/2006/09/13/erlang-mysql-driver-reloaded/
I haven't personally used it as my erlang projects mostly talk to redis, but my quick scan of the source didn't reveal anything too terrifying.
Maturity is a relative thing, especially for more esoteric languages like erlang.
Erlang pgsql - The pgsql-driver is a 100% erlang implementation of the Postgres Frontend/Backend protocol.
Plain straight ODBC ? Quite simple to set it up, but a pain to make it work..
http://github.com/inaka/sumo_db_mysql or http://github.com/inaka/sumo_db_pgsql Both of them are stable, actively maintained and used in production systems
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Anybody found yet a good web site architecture using linq to sql? Any help will be very helpful!
We just finished up an internal IT project banking heavily on Linq2Sql and it paid off. I was a bit skeptical at first, but I think it worked out great in the end. Just remember, the fundamentals don't change.
try to stay as stateless as possible
keep clean lines between your services and data access
don't fight linq, use it. If it isn't helping you, you are probably doing something wrong
Our implementation ended up being a hybrid of the Andrew Siemer and Beth Massi approach (a bit heavier on the Andrew side) and in C#
What, apart from StackOverflow? ;-)
Remember Linq is a technology that sits atop the typical data access structures. Therefore all rules that have applied thus far still hold. Just because you can get to data a little easier in the client app doesnt mean you throw out the architecture best practices for data access.
Rob Conery's MVC Storefront
As others have said, linq-to-sql is no different to any other ORM so the architecture is the same as you would use for NHibernate and others.