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xpath_namespaces is an optional parameter that can provide a namespace declaration for row and column expressions in OpenXML. The default value is <root xmlns:mp= urn: schemas-microsoft-com:xml-metaprop > . The stored procedure returns a value that is different from zero when SQL Server is not able to prepare the document. You should use this information to perform error handling in the usual manner.
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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> </root>' --Load the XML document into memory. EXEC sp_xml_preparedocument @intDoc OUTPUT, @chvXMLDoc
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After processing, the document should be removed from memory using sp_xml_removedocument. This stored procedure uses very simple syntax:
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exec sp_xml_removedocument hdoc
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The hdoc parameter is a handle for a loaded XML document.
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-- remove the XML document from memory EXEC sp_xml_removedocument @intDoc
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OpenXML is a rowset provider that gives access to the internal tree memory structure that contains information from an XML document. It has the following syntax:
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OpenXML(hdoc, rowpattern, flags) [With (SchemaDeclaration | TableVariable)]
SQL Server 2000 Stored Procedure Programming
hdoc is a handle that points to the tree containing XML data. rowpattern is the XPath string used to identify nodes that need to be processed. flags is an optional parameter that controls the way that data from the XML document is mapped to the rowset and how data is to be copied to the overflow metaproperty (we will explain this a little later). SchemaDeclaration is a declaration of the structure in which data will be returned. Alternatively, it is possible to use the name of a table variable (TableVariable) instead. The rowset will be formed using the structure of the table variable. The SchemaDeclaration can be composed using the following syntax:
ColName ColType [ColPattern | MetaProperty]
[, ColName ColType [ColPattern | MetaProperty]...]
ColName is the name and ColType is the datatype of the column. This structure is very similar to the table structure of the Create Table statement. ColPattern is an optional parameter that defines how a column is to be mapped to the XML node. A MetaProperty is specified to extract metadata such as datatypes, node types, and namespace information. Let s finally take a look at an example that uses all these constructs:
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"/>
12:
XML Support in SQL Server 2000
</Equipment> </root>' --Load the XML document into memory. 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') -- remove the XML document from memory EXEC sp_xml_removedocument @intDoc
The result is shown on Figure 12-8.
Figure 12-8.
Use of OpenXML as a rowset provider
SQL Server 2000 Stored Procedure Programming
In the preceding example, the OpenXML rowset provider is used in a Select statement:
SELECT WITH * (InventoryID int '@InventoryID', StatusID int '@StatusID', Make varchar(25) '../@Make', Model varchar(25) '../@Model', comment ntext '@mp:xmltext') From Openxml (@intDoc, '/root/Equipment/Inventory', 8)
The Rowpattern parameter specifies that information will be extracted (mostly) from Inventory nodes ( /root/Equipment/ Inventory ). The third parameter of the OpenXML clause sets the way in which the overflow metaproperty is to be filled. In the preceding example, the last column (comment) was filled with metadata provided by the XML parser (since the column is associated with the @mp:xmltext attribute). Because the third parameter of OpenXML is set to 8 (the XML_NOCOPY constant), the overflow attribute does not contain nodes that are extracted into the rowset. Only nodes that are not used are recorded. Other columns in the rowset are filled from data that exists in attributes. If you remember XPath (and XPattern), introduced earlier in the chapter, the @ character is used as an abbreviation that points to attribute nodes. The Make and Model columns are not in the same group of nodes as InventoryID and StatusId. Since they are attributes of the Equipment node, ColPattern has to refer to the parent node ( ../@Model ) first. Table 12-7 shows a list of possible values of the flags parameter. XML_NOCOPY could be combined (logical OR) with XML_ATTRIBUTES (1+8 = 9) or XML_ELEMENTS (2 + 8 = 10). This flag can be used to generate either a string with the overflow information or a string with a complete branch of the XML document. The following example extracts the branch of the XML document/tree that describes a node with EquipmentID set to 1:
Select * From Openxml (@intDoc, '/root/Equipment', 2)
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