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Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
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III Object Based Databases and XML
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10 XML
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The McGraw Hill Companies, 2001
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for $c in /bank/customer, return <customer> $c/* </customer> sortby(name) To sort in descending order, we can use sortby(name descending) Sorting can be done at multiple levels of nesting For instance, we can get a nested representation of bank information sorted in customer name order, with accounts of each customer sorted by account number, as follows <bank-1> for $c in /bank/customer return <customer> $c/* for $d in /bank/depositor[customer-name = $c/customer-name], $a in /bank/account[account-number=$d/account-number] return <account> $a/* </account> sortby(account-number) </customer> sortby(customer-name) </bank-1>
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XQuery provides a variety of built-in functions, and supports user-de ned functions For instance, the built-in function document(name) returns the root of a named document; the root can then be used in a path expression to access the contents of the document Users can de ne functions as illustrated by this function, which returns a list of all balances of a customer with a speci ed name:
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function balances(xsd:string $c) returns list(xsd:numeric) { for $d in /bank/depositor[customer-name = $c], $a in /bank/account[account-number=$d/account-number] return $a/balance }
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XQuery uses the type system of XMLSchema XQuery also provides functions to con-
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vert between types For instance, number(x) converts a string to a number XQuery offers a variety of other features, such as if-then-else clauses, which can be used within return clauses, and existential and universal quanti cation, which can be used in predicates in where clauses For example, existential quanti cation can be expressed using some $e in path satis es P where path is a path expression, and P is a predicate which can use $e Universal quanti cation can be expressed by using every in place of some
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105 The Application Program Interface
With the wide acceptance of XML as a data representation and exchange format, software tools are widely available for manipulation of XML data In fact, there are two standard models for programmatic manipulation of XML, each available for use with a wide variety of popular programming languages
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
III Object Based Databases and XML
10 XML
The McGraw Hill Companies, 2001
Storage of XML Data
One of the standard APIs for manipulating XML is the document object model (DOM), which treats XML content as a tree, with each element represented by a node, called a DOMNode Programs may access parts of the document in a navigational fashion, beginning with the root DOM libraries are available for most common programming langauges and are even present in Web browsers, where it may be used to manipulate the document displayed to the user We outline here some of the interfaces and methods in the Java API for DOM, to give a avor of DOM The Java DOM API provides an interface called Node, and interfaces Element and Attribute, which inherit from the Node interface The Node interface provides methods such as getParentNode(), getFirstChild(), and getNextSibling(), to navigate the DOM tree, starting with the root node Subelements of an element can be accessed by name getElementsByTagName(name), which returns a list of all child elements with a speci ed tag name; individual members of the list can be accessed by the method item(i), which returns the ith element in the list Attribute values of an element can be accessed by name, using the method getAttribute(name) The text value of an element is modeled as a Text node, which is a child of the element node; an element node with no subelements has only one such child node The method getData() on the Text node returns the text contents DOM also provides a variety of functions for updating the document by adding and deleting attribute and element children of a node, setting node values, and so on Many more details are required for writing an actual DOM program; see the bibliographical notes for references to further information DOM can be used to access XML data stored in databases, and an XML database can be built using DOM as its primary interface for accessing and modifying data However, the DOM interface does not support any form of declarative querying The second programming interface we discuss, the Simple API for XML (SAX) is an event model, designed to provide a common interface between parsers and applications This API is built on the notion of event handlers, which consists of user-speci ed functions associated with parsing events Parsing events correspond to the recognition of parts of a document; for example, an event is generated when the start-tag is found for an element, and another event is generated when the end-tag is found The pieces of a document are always encountered in order from start to nish SAX is not appropriate for database applications
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