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Squeryl
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A Scala ORM and DSL for talking with Databases with minimum verbosity and maximum type safety
Write compiler validated statements.
Squeryl statements that pass compilation won’t fail at runtime. Refactor your schema as often as is required, the Scala compiler and your IDE will tell you exactly which lines of code are affected.
Never repeat yourself
The Composability of Squeryl statements allows you to define them
once and reuse them as sub queries within other statements.
Write declaratively
Write as declaratively as SQL, only with less boilerplate. SQL’s declarativeness is preserved, not encapsulated in a lower level API that requires imperative and procedural code to get things done.
Explicitly control retrieval granularity and laziness
A significant part of optimizing a database abstraction layer is to choose for every situation the right balance between fine and large grained retrieval, and the optimal mix of laziness and eagerness. Data retrieval strategies are explicit in Squeryl rather than driven by configuration like current generation Java ORMs read more
au:chlipala Ur introduces richer type system features into FP. Ur is functional, pure, statically-typed, and strict. Ur supports metaprogramming based on row types. Ur/Web is standard library and associated rules for parsing and optimization. Ur/Web supports construction of dynamic web applications backed by SQL databases. The signature of the standard library is such that well-typed Ur/Web programs "don't go wrong" in a very broad sense. They also may not: * Suffer from any kinds of code-injection attacks * Return invalid HTML * Contain dead intra-application links * Have mismatches between HTML forms and the fields expected by their handlers It is also possible to use metaprogramming to build significant application pieces by analysis of type structure - demo includes an ML-style functor for building an admin interface for an arbitrary SQL table. The Ur/Web compiler also produces very efficient object code that does not use gc
c2005 Most new ideas in software developments are really new variations on old ideas. This article describes one of these, the growing idea of a class of tools that I call Language Workbenches - examples of which include Intentional Software, JetBrains's Meta Programming System, and Microsoft's Software Factories. These tools take an old style of development - which I call language oriented programming and use IDE tooling in a bid to make language oriented programming a viable approach. Although I'm not enough of a prognosticator to say whether they will succeed in their ambition, I do think that these tools are some of the most interesting things on the horizon of software development. Interesting enough to write this essay to try to explain, at least in outline, how they work and the main issues around their future usefulness.
Jaskell is a functional scripting programming language that runs in JVM. The name "Jaskell" stands for Java-Haskell, but it is not haskell 1. Most of the current scripting languages are Object-Oriented. Though they more or less have functional tastes (Ruby's sexy closure, for example), the heart of them are still Object-Oriented. One of the most important essenses of functional programming (combinators) is yet to be brought into Java. 2. Jaskell brings with it higher order function, function currying, pattern match and monadic combinator support. 3. Monadic combinator is ideal for designing Domain Specific Language. It is relatively easy to tailor Jaskell runtime to make domain specific syntax look like simple atomic statements. See Neptune for a real example. 4. Jaskell is nothing but a Java library that passes Java objects in and out of the interpreter.
Since programmers often build task-specific tools, one way to make them more productive is to give them better tool-making tools. When tools take the form of program generators, this idea leads to libraries for creating languages that are directly extensible. Programmers may even be encouraged to think about a problem in terms of a language that would better support the task. This approach is sometimes called language-oriented programming
You might have read (about) the book Domain-Specific Languages written by Martin Fowler. As the name suggests it is about these little useful programming languages you can built very easily with Xtext.