Add AnyOf to TableQuery to build more complex OR clauses.

[DouweM]

We have a filter interface, where our users can specify predicates to filter a large set of data. Some of these predicates should be ANDed, and some of these should be ORed. For AND, predicates can easily be added on top of each other by chaining Where calls, but there's no way to build an OR clause with an a priori unknown number of predicates, since the only way to specify an OR clause is || and SQLite.Net expects a pretty basic expression.

The new AnyOf method takes a (params-)array of predicates, which allows us to make WHERE ... OR ... queries from lists of predicates, like so:

List<Expression<Func<T, bool>>> preds = new List<Expression<Func<T, bool>>>();
// In real life, these would be generated by the filter interface.
preds.Add(thing => thing.Name == "Whatever");
preds.Add(thing => thing.Foo == "Bar");
conn.Table<Thing>.AnyOf(preds.ToArray());

AnyOf looks even nicer like so, although in this case we could also use Where and ||:

conn.Table<Thing>.AnyOf(thing => thing.Name == "Whatever", thing => thing.Foo == "Bar");

Note that this is my first foray into extending SQLite.Net, so cut me a little slack, but feel free to criticize the code to the fullest extent :)

[oysteinkrog]

This sounds nice, I'll review/merge when I've got the current prerelease/beta out the door.

[DouweM]

@oysteinkrog Thank you. I should add that I haven't been able to test this, as I was unable to get the project to run.

[oysteinkrog]

Hmm ok, what is the problem?
Can you compile the two main projects?

[DouweM]

@oysteinkrog Never mind, I was able to get it working. Added tests too :)