This is the eighth part of the SQLxD series. For your convenience you can find other parts in the table of contents in Part 1 – XML Transformation We continue implementing the predicates. Today we will join them to construct logic expressions. In order to be able to handle complex expressions we need to introduce … Continue reading SQLxD Part 8 — WHERE with joined predicates

This is the seventh part of the SQLxD series. For your convenience you can find other parts in the table of contents in Part 1 – XML Transformation Last time we saw how to handle FROM clause. Today we are going to implement filtering logic for handling WHERE. We start with the clause logic: As … Continue reading SQLxD Part 7 — WHERE with simple predicates

This is the sixth part of the SQLxD series. For your convenience you can find other parts in the table of contents in Part 1 – XML Transformation We already know how to transform XML nodes into SQL-like rows. Now it is time to execute DQL queries. For now I will just describe operators implementation, … Continue reading SQLxD Part 6 — FROM

This is the fifth part of the SQLxD series. For your convenience you can find other parts in the table of contents in Part 1 – XML Transformation We already have the model, can parse XML document, and know how to refer to specific node in it. It is time to transform node into row. … Continue reading SQLxD Part 5 — Generating columns

This is the fourth part of the SQLxD series. For your convenience you can find other parts in the table of contents in Part 1 – XML Transformation Now we can implement classes representing multi-part identifiers. We start with the following: This selector providers us an abstraction of selecting nodes from root. We start with … Continue reading SQLxD Part 4 — Selectors