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Attribute-centric mapping Element-centric mapping Default equivalent to XML_ATTRIBUTES (1) Overflow metaproperty of the document (@mp:xmltext) should contain only nodes that were not extracted using the OpenXML() rowset provider
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Values of the flags Parameter of OpenXML()
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the XML document. The following example extracts the branch of the XML document/tree that describes a node with EquipmentID set to 1:
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Select * From Openxml (@intDoc, '/root/Equipment', 2) With (EquipmentID int '@EquipmentID', Branch ntext '@mp:xmltext') Where EquipmentId = 1
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SQL Server 2000 returns the following:
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EquipmentID Branch ----------- --------------------------------------------------------1 <Equipment EquipmentID="1" Make="Toshiba" Model="Portege 7020CT"> <Inventory InventoryID="5" StatusID="1" EquipmentID="1"/> <Inventory InventoryID="12" StatusID="1" EquipmentID="1"/> </Equipment> (1 row(s) affected)
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XML_ATTRIBUTES and XML_ELEMENTS can also be combined. The first level of (selected) nodes are mapped as attributes and others are mapped as elements.
Metaproperties in OpenXML()
After the parser loads the XML document into memory, SQL Server allows the OpenXML() rowset to access a set of properties that describe attributes of the data. These properties are defined in a special namespace (urn:schemas-microsoft -com:xml-metaprop). Table 15-2 shows the list of possible values and their meanings. Metaproperty
@@mp:id @@mp:localnamed @@mp:namespaceuri @@mp:Prefix Table 15-2
Description
System-generated identifier. It could be used as a unique identifier on the level of the document (until the document is reparsed). Name of the current node. Namespace URI for the current element. Prefix of the namespace for the current element.
Metaproperties in OpenXML()
SQL Server 2000 Stored Procedure & XML Programming
Metaproperty
@@mp:xmltext
Description
String containing the XML branch of the current element, its attributes, and subelements. It could be set not to contain nodes that have already been read by other columns of the OpenXML() provider. ID of the previous sibling of the node. ID of the parent node (equivalent of ../@mp:parentid). Name of the parent node (equivalent of ../@mp:localname). Namespace of the parent node (equivalent of ../@mp:namespaceuri). Prefix of the namespace of the parent node (equivalent of ../@mp:prefix).
@@mp:prev @@mp:parented @@mp:parentlocalname @@mp:parentnamespaceuri @@mp:parentprefix Table 15-2
Metaproperties in OpenXML() (continued)
The following example and Figure 15-2 demonstrate the use of metaproperties.
Figure 15-2
Use of metaproperties in OpenXML()
15: Modifying Databases Using SQLXML
DECLARE @intDoc int DECLARE @chvXMLDoc varchar(8000) -- sample XML document SET @chvXMLDoc =' <root> <Equipment EquipmentID="1" Make="Toshiba" Model="Portege 7020CT"> <Inventory InventoryID="5" StatusID="1" EquipmentID="1"/> <Inventory InventoryID="12" StatusID="1" EquipmentID="1"/> </Equipment> <Equipment EquipmentID="2" Make="Sony" Model="Trinitron 17XE"/> <Equipment EquipmentID="4" Make="HP" Model="LaserJet 4"/> <Equipment EquipmentID="5" Make="Bang & Olafson" Model="V4000"> <Inventory InventoryID="8" StatusID="1" EquipmentID="5"/> </Equipment> <Equipment EquipmentID="6" Make="NEC" Model="V90"> <Inventory InventoryID="6" StatusID="2" EquipmentID="6"/> </Equipment> </root> ' --Load the XML document into memory. EXEC sp_xml_preparedocument @intDoc OUTPUT, @chvXMLDoc -- SELECT statement using OPENXML rowset provider SELECT top 4 * FROM OPENXML (@intDoc, '/root/Equipment/Inventory') WITH (InventoryID int '@InventoryID', ID int '@mp:id', localname varchar(20) '@mp:localname', namespaceuri varchar(40) '@mp:namespaceuri', Prefix varchar(40) '@mp:Prefix', prev varchar(40) '@mp:prev', comment ntext '@mp:xmltext') -- remove the XML document from memory EXEC sp_xml_removedocument @intDoc
What if an XML Document Is Longer Than 8000 Characters
You have probably noticed that we used long varchar strings (8000 characters) in the preceding examples to store XML documents. Naturally, XML documents could
SQL Server 2000 Stored Procedure & XML Programming
be longer than this arbitrary figure. The trouble is that you cannot define local variables of the text data type (and varchar is limited to only 8000 characters). Fortunately, sp_xml_preparedocument and OpenXML() can handle text parameters. Instead of using a local variable of the text data type, you can use an input parameter of a custom stored procedure as a parameter for sp_xml_preparedocument. The following stored procedure illustrates this method:
Alter Procedure prTestXML -- Extract Inventory info. from long XML document. -- Demonstration of usage of text input parameters -- to parse long XML document. @chvXMLDoc text As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int @intDoc int Select @intErrorCode = @@Error
--Create an internal representation of the XML document. EXEC sp_xml_preparedocument @intDoc OUTPUT, @chvXMLDoc -- SELECT statement using OPENXML rowset provider SELECT * FROM OPENXML (@intDoc, '/root/Equipment/Inventory', 8) WITH (InventoryID int '@InventoryID', StatusID int '@StatusID', Make varchar(25) '../@Make', Model varchar(25) '../@Model', comment ntext '@mp:xmltext') EXEC sp_xml_removedocument @intDoc return @intErrorCode
Figure 15-3 demonstrates the use of the stored procedure. A large XML document was created by copying and pasting the same set of nodes into the string (XML document) over and over.
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