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SQL Server 2000 Stored Procedure Programming
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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 Row modes of the For XML clause. Figure 12-7 shows an encoded photo of an employee from the Northwind database.
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SELECT Photo FROM Northwind..Employees WHERE EmployeeID=2 FOR XML RAW, XMLData, BINARY Base64
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The Raw mode of the For XML clause returns every row of the resultset as an individual XML element named row.
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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 resultset 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"/> <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.
The Explicit Mode
The Explicit mode is much more flexible than Auto or Raw mode. It allows a developer to specify all details of an XML document (shape and data). The developer is 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. The table contains all the information needed to create the XML document (both meta data and data). Table 12-5 shows such a universal table.
SQL Server 2000 Stored Procedure Programming
Equipment!1! Tag 1 2 2 1 1 1 2 1 2 Parent NULL 1 1 NULL NULL NULL 1 NULL 1 EquipmentID 1 1 1 2 4 5 5 6 6
Equipment!1! Make Toshiba Toshiba Toshiba Sony HP HP HP NEC NEC
Equipment!1! Model Portege 7020CT Portege 7020CT Portege 7020CT Trinitron 17XE LaserJet 4 LaserJet 4 LaserJet 4 V90 V90
Inventory!2! InventoryID NULL 5 12 NULL NULL NULL 8 NULL 6
Inventory!2! StatusID NULL 1 1 NULL NULL NULL 1 NULL 2
Table 12-5.
A Universal Table
When the query that generates such a 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> ...
12:
XML Support in SQL Server 2000
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 element. The Parent column contains a tag for the parent record. SQL Server uses these to create a hierarchy. The top element will have 0 (zero) or Null in the Parent column. Other columns provide elements and attribute names and data. Column names have to be specified using the following template:
GI!TagNumber!AttributeName!Directive
Table 12-6 explains the meaning of components of the template:
Component
Meaning
GI TagNumber AttributeName
Generic identifier of the element. The tag number of the element. The name of the attribute if the Directive is not specified. In the case in which the Directive is specified (as xml, cdata, or element), the AttributeName becomes the name of the contained element. If the Directive is specified, the AttributeName can be empty. The optional component. If neither the AttributeName nor the Directive are specified, SQL Server defaults to ELEMENT.
Directive
Table 12-6.
Components of Column Names
SQL Server 2000 Stored Procedure Programming
The following example illustrates how the Tag and Parent columns are used to form the hierarchy of the XML document and how the AttributeName component of the column name is used to name attributes (we have already shown the corresponding global table and the resulting XML document):
SELECT 1 as Tag, NULL as Parent, Equipment.EquipmentID as [Equipment!1!EquipmentID], Equipment.Make as [Equipment!1!Make], Equipment.Model as [Equipment!1!Model], NULL as [Inventory!2!InventoryID], NULL as [Inventory!2!StatusID] FROM UNION ALL SELECT 2, 1, Equipment.EquipmentID, Equipment.Make, Equipment.Model, Inventory.InventoryID, Inventory.StatusID FROM WHERE Equipment, Inventory Equipment.EquipmentID = Inventory.EquipmentID Equipment
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