On Friday, 11 September 2015 at 23:47:42 UTC, Andrei Alexandrescu
wrote:
1. Use lambdas, which seem to already do what you want:
db.get!Person.filter!(p => p.age > 21 && p.name == "Peter")
The way this'd go, the db.get!Person() call returns an input
range of Person. Presumably introspection is being used to bind
fields in the query such as "age" and "name" to static field
names in struct Person. Then good old std.algorithm.filter
takes care of the rest.
I'm instantiating the lambda with a fake p to capture the
expression so I can translate it to whatever SQL, MongoDB,
columnar db is used.
2. If you want to embed real SQL into D, use string-based DSLs.
Strings don't capture context, aren't typechecked, and require a
complex CTFE parser.
db.get!Person.where!"age > 21 & name = ?"(name);
