The Elements Option in .NET framework

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The Elements Option
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Table columns do not have to be encoded as attributes. If you add the Elements option to the For XML clause, all columns will be coded as subelements. You can see the result set of the following query in Figure 14-3. Nested tables are also encoded as subelements.
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Select * From Inventory Inner Join Equipment On Inventory.EquipmentId = Equipment.Equipmentid For XML Auto, Elements
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The Elements option is supported only in Auto mode.
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14: Publishing Information Using SQLXML
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Figure 14-3
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Use of the Elements option in the For XML clause
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The XMLData Option
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If the XMLData option is specified in the For XML clause, the XML document will also contain an XML Data Reduced (XDR) schema:
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select * from Equipment for XML Auto, XMLData
The schema is added at the beginning of the document as an inline schema:
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <ElementType name="Equipment" content="empty" model="closed"> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="Make" dt:type="string"/>
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<AttributeType name="Model" dt:type="string"/> <AttributeType name="EqTypeId" dt:type="i2"/> <AttributeType name="ModelSDX" dt:type="string"/> <AttributeType name="MakeSDX" dt:type="string"/> <attribute type="EquipmentId"/> <attribute type="Make"/> <attribute type="Model"/> <attribute type="EqTypeId"/> <attribute type="ModelSDX"/> <attribute type="MakeSDX"/> </ElementType> </Schema> <Equipment xmlns="x-schema:#Schema" EquipmentId="1" Make="Toshiba" Model="Portege 7020CT" EqTypeId="1" ModelSDX="P632"/> <Equipment xmlns="x-schema:#Schema" EquipmentId="2" Make="Sony" Model="Trinitron 17XE" EqTypeId="3" ModelSDX="T653"/> <Equipment xmlns="x-schema:#Schema" EquipmentId="6" Make="NEC" Model="V90" EqTypeId="1" ModelSDX="V000"/> <Equipment xmlns="x-schema:#Schema" EquipmentId="4" Make="HP" Model="LaserJet 4" EqTypeId="6" ModelSDX="L262"/> <Equipment xmlns="x-schema:#Schema" EquipmentId="5" Make="HP" Model="LaserJet 4" EqTypeId="7" ModelSDX="L262"/>
Data elements also include an attribute with a reference to the schema:
xmlns="x-schema:#Schema"
You have to be very careful when generating a schema this way. The schema could be incorrect if, for example, your query specifies a recordset that contains fields (and/or aliases) with the same name (for example, when fields have the same name in both main and lookup tables). SQL Server will not resolve name or data type collisions.
The BINARY Base64 Option
The BINARY Base64 option is designed for encoding binary data such as images, video, and sounds via XML. It is not required in Auto mode, but it must be specified in Explicit and Raw modes of the For XML clause. Figure 14-4 shows an encoded photograph of an employee from the Northwind database.
SELECT Photo FROM Northwind..Employees WHERE EmployeeID=2 FOR XML RAW, XMLData, BINARY Base64
14: Publishing Information Using SQLXML
Figure 14-4
Encoding of binary data in XML
Raw Mode
Raw mode of the For XML clause returns every row of the result set as an individual XML element named row:
Select Equipment.Make, Equipment.Model, Inventory.InventoryID, Inventory.Cost From Inventory Inner Join Equipment On Inventory.EquipmentId = Equipment.Equipmentid For XML Raw
Note that elements in the result set are called row and that the mode is called Raw:
<row Make="Toshiba" Model="Portege 7020CT" InventoryID="5" Cost="1295.0000"/> <row Make="NEC" Model="V90" InventoryID="6"/> <row Make="HP" Model="LaserJet 4" InventoryID="8"/> <row Make="Toshiba" Model="Portege 7020CT" InventoryID="12"/>
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<row Make="Toshiba" Model="Portege 7020CT" InventoryID="5"Cost="1295.0000"/> <row Make="NEC" Model="V90" InventoryID="6"/> <row Make="HP" Model="LaserJet 4" InventoryID="8"/> <row Make="Toshiba" Model="Portege 7020CT" InventoryID="12"/>
Columns that have a null value are skipped in the list of attributes. Columns are always encoded as attributes because it is not possible to specify the Elements option in this mode. Again, it is important to avoid name collisions.
Explicit Mode
Explicit mode is much more flexible than Auto mode or Raw mode. It allows you to specify all details of an XML document including the shape and data. You are therefore responsible for ensuring that the XML document is well formed and valid. The process of creating such a document involves writing a query that defines a universal table. This table contains all the information (both metadata and data) needed to create the XML document. Table 14-1 shows a universal table. When the query that generates the universal table is executed with the For XML Explicit option, SQL Server returns an XML document such as the following:
<Equipment EquipmentID="1" Make="Toshiba" Model="Portege 7020CT"> <Inventory InventoryID="5" StatusID="1"/> <Inventory InventoryID="12" StatusID="1"/> </Equipment> <Equipment EquipmentID="2" Make="Sony" Model="Trinitron 17XE"/> <Equipment EquipmentID="4" Make="HP" Model="LaserJet 4"/> <Equipment EquipmentID="5" Make="HP" Model="LaserJet 4"> <Inventory InventoryID="8" StatusID="1"/> </Equipment> <Equipment EquipmentID="6" Make="NEC" Model="V90"> <Inventory InventoryID="6" StatusID="2"/> </Equipment> ...
The first two columns of the table (Tag and Parent) control the shape (that is, the nesting) of the XML document. The Tag column contains an identifier for the current element. The Parent column contains a tag value for the Parent element. SQL Server uses these columns to create the hierarchy. The top-level element will have a 0 (zero) or null value for the Parent column.
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