Query Readers

When Insight goes to translate a bunch of recordsets into query results, it uses an instance of IQueryReader<T>. As you might expect, QueryReaders know how to read the results of queries.

There are several implementations:

• SingleReader<T> - reads a single record from the recordset.
• ListReader<T> - reads a list of records from the recordset.
• ResultsReader<T1, T2...> - reads multiple records from the recordset.

Each of the query readers can take an IRecordReader as a parameter. The record reader reads individual records within the query reader. That's how we combine one-to-one relationships with other types of reads.

The built-in readers can also be chained together to form complex structures. That's what the Then and ThenChildren methods do.

ListReader<Beer> lr = Query.Returns(Some<Beer>.Records);
RecordReader<Beer, Wine> rr = lr.Then(Some<Wine>.Records);
RecordReader<Beer, Wine> rr2 = rr.ThenChildren(Some<Glass>.Records);

You can combine them into almost any structure you could need.

Custom Query Readers

If there is some other structure you would need, you could always implement IQueryReader yourself. The rest of Insight will still work for you.

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