Xquery software free

In fact, this example is just about stretching XPath to its limits. For this kind of query, and for anything more complicated, XQuery syntax comes into its own.

But it's worth remembering that there are many simple things you can do with XPath alone, and that every valid XPath expression is also valid in XQuery. Note that Stylus Studio also provides a built-in XPath analyzer for visually editing and testing complex XPath expressions, and it supports both version 1. If you've used SQL, then you will have recognized the last example as a join between two tables, the videos table and the actors table.

It's not quite the same in XML, because the data is hierarchic rather than tabular, but XQuery allows you to write join queries in a similar way to the familiar SQL approach.

If you've been following very closely, you might have noticed one little XPath trick that we've retained in this query. Most videos will feature more than one actor though this particular database doesn't attempt to catalog the bit-part players.

In effect, it's doing an implicit join. If you want to avoid exploiting this feature, and to write your query in a more classically relational form, you could express it as:. But like comparisons in SQL, it has special rules to handle the case where one of the values is absent. That's there so you can get the results in sorted order. Suppose you want the videos in order of their release date. Here's the revised query:. And if you're wondering why it isn't a LFWOR expression: the for and let clauses can appear in any order, and you can have any number of each.

So far all the queries we've written have selected nodes in the source document. I've shown the results as if the system copies the nodes to create some kind of result document, and if you run DataDirect XQuery from the command line of from within Stylus Studio that's exactly what happens; but that's simply a default mode of execution.

In a real application you want control over the form of the output document, which might well be the input to another application — perhaps the input to an XSLT transformation or even another query. XQuery allows the structure of the result document to be defined using an XML-like notation. Here's an example that fleshes out our previous query with some XML markup:.

I've also changed the query so that the actor's first name is now a parameter. This makes the query reusable. The way parameters are supplied varies from one XQuery processor to another. If instead you're running DataDirect XQuery from the command line, this is how the output looks now:. Not a very well-designed query, since the two videos feature different actresses both named Lisa; but if your ten minutes aren't up yet, perhaps you can improve it yourself.

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