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(EquipmentID int '@EquipmentID', Branch ntext '@mp:xmltext')
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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. Attribute-centric mapping is applied on the first level of (selected) nodes. Others are treated with element-centric mapping.
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XML_ATTRIBUTES XML_ELEMENTS XML_DEFAULT XML_NOCOPY
1 2 0 8
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.
Table 12-7.
Values of the Flags Parameter of OpenXML
SQL Server 2000 Stored Procedure Programming
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 information. These properties are defined in a special namespace (urn:schemas-microsoft-com:xml-metaprop). Table 12-8 shows the list of possible values and their meanings:
Metaproperty @mp:id
Description System-generated identifier. It could be used as a unique identifier on the level of the document (until the document is re-parsed). Name of the current node Namespace URI for the current element Prefix of the namespace for the current element 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
@mp:localnamed @mp:namespaceuri @mp:Prefix @mp:xmltext
@mp:prev @mp:parented
(equivalent of
../@mp:parentid)
Table 12-8.
Metaproperties in OpenXML
12:
XML Support in SQL Server 2000
@mp:parentlocalname
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:parentnamespaceuri
@mp:parentprefix
Table 12-8.
Metaproperties in OpenXML (continued)
The following example and Figure 12-9 demonstrate the use of metaproperties:
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.
SQL Server 2000 Stored Procedure Programming
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', [mp: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
Figure 12-9.
Use of metaproperties in OpenXML
12:
XML Support in SQL Server 2000
What If an XML Document Is Longer Than 8,000 Characters
You have probably noticed that we used long varchar strings (8,000 characters) in the preceding examples to store XML documents. Naturally, XML documents could be longer than this arbitrary figure. The trouble is that you cannot define local variables of the text datatype (and varchar is limited to only 8,000 characters). Fortunately, sp_xml_preparedocument and OpenXML can handle text parameters. Instead of using a local variable of the text datatype, we can use an input parameter of a custom stored procedure as a parameter for sp_xml_preparedocument. The following stored procedure uses 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',
SQL Server 2000 Stored Procedure Programming
Model varchar(25) '../@Model', comment ntext '@mp:xmltext') EXEC sp_xml_removedocument @intDoc return @intErrorCode
Figure 12-10 demonstrates the use of the stored procedure. A long 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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