Why does the “Limit()” method no longer exist in the ServiceStack OrmLite v4?

问题

in ServiceStack OrmLite v3 you could do:

var rows = db.Select<Employee>().Limit(10));

Or:

var rows = db.Select<Employee>().Limit(5, 10)); // skips 5 then takes 10

However I cannot find these methods any longer in v4.

I suppose I can do the following instead:

var rows = db.SelectLazy<Employee>().Take(10);

However how can I do a db.Select (not having to write direct SQL) which will translate to (in SQLite for example):

SELECT * FROM Employee LIMIT 10;

Also, is it possible to write an equivalent query for the below (again without having to write direct SQL)?

SELECT * FROM Employee ORDER BY Age;

Thanks.

回答1:

In ServiceStack.OrmLite v4, Limit() seems to only be available as an extension of SqlExpression<T>. To build a query:

var query = db.From<SWChars>().Limit(10);
query = query.Where<SWChars>(char => 
    char.FirstName == "Jar Jar" &&
    char.FunnyLines < 0);

var result = db.Select<SWChars>(query);

I hope this helps someone out. It took me a few hours of Googling.

回答2:

I can see the OrderBy / OrderByDescending in the documentation, it looks like:

var rows = db.SelectLazy<Employee>().OrderBy<Employee>(e=>e.Age).Take(10);

This might help with the Limit issue ServiceStack.OrmLite: Where is the method to write custom SQL and get result set back?

来源：https://stackoverflow.com/questions/25057574/why-does-the-limit-method-no-longer-exist-in-the-servicestack-ormlite-v4