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@hdrLevel /header@hdrLevel para[3] * */para chapter[@revStatus= draft ]
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Table 25-2.
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Like SQL, XQuery is a set-oriented language. It is optimized to work on an XQuery sequence, an ordered collection of zero or more items. The items themselves might be elements, attributes, or data values. XQuery operations tend to take sequences as their input and produce sequences as their output. A simple atomic data item is usually treated as if it were a one-item sequence. XQuery also resembles SQL in being a strongly typed language. The working draft of the XQuery specification is evolving to align the XQuery data types with those specified in XML Schema, which were described earlier in this chapter in the XML Schema section. Like SQL3, XQuery provides constructors to build up more complex data values. XQuery differs substantially from SQL in being an expression-oriented rather than a statement-oriented language. Casually stated, everything in XQuery is an expression, which is evaluated to produce a value. Path expressions are one type of XQuery expression, and they produce a sequence of nodes as their result. Other expressions may combine literal values, function calls, arithmetic and Boolean expressions, and the typical parenthesized combinations of these to form arbitrarily complex expressions. Expressions can also combine sequences of nodes, using set operations like the union or intersection of sets, which match the corresponding SQL set operations. Named variables in XQuery are denoted by a leading dollar sign ($) in their names. For example, $orderNum, $currentOffice, and $c would be valid XQuery variable names. Variables can be used freely in XQuery expressions to combine their variables with literals and other variable values and node values. Variables receive new values through function calls, and by assignment in for or let expressions.
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Query Processing in XQuery
XQuery path expressions can provide the XML equivalent of the simple SQL SELECT statement with a WHERE clause. Assume that a collection of XML documents contains the XML equivalent of the contents of the sample database, with the top-level documents named with the names of the tables in the sample database and the individual row structures named with the singular equivalents of those names (e.g., the OFFICES document contains individual OFFICE elements to represent the rows of the OFFICES table, and so on). Here are some query requests and their corresponding path expressions: Identify the offices managed by employee number 108.
/offices/office[mgr=108]
Find all offices with sales over target.
/offices/office[sales > target]
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Find all orders for manufacturer ACI with amounts over $30,000.
/orders/order[mfr = 'ACI' and amount > 35000.00]
Because the sample database is a shallow row/column structure, the XML hierarchy is only three levels deep. To illustrate the query possibilities in more hierarchical XML documents, consider once again the book document in Figure 25-1. Here are some query requests and their corresponding path expressions: Find all components of chapters that have draft status.
/book/part/chapter[revStatus='draft']/*
Get the third paragraph of the second chapter of part 2.
/book/part[2]/chapter[2]/para[3]
These expressions don t give you the same control over query results as the SELECT list provides in SQL queries. They also don t provide the equivalent of SQL cursors for row-by-row processing. XQuery provides both of these capabilities through For/Let/ Where/Returns expressions (FLWR expressions, pronounced flower ). An example is the best way to illustrate the capability. Once again, assume a set of XML documents structured to resemble the sample database, as in the previous examples. This query implements a two-table join and generates three specific columns of query results: List the salesperson s name, order date, and amount of all orders under $5000, sorted by amount.
<smallOrders> { for $o in document("orders.xml")//order[amount < 5000.00], $r in document("salesreps.xml")//salesreps[empl_num=$o/order/rep] return <smallOrder> { $r/name, $o/order_date, $o/amount } </smallOrder> sortby(amount) } </smallOrders>
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