14: Publishing Information Using SQLXML in .NET framework

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14: Publishing Information Using SQLXML
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I will execute this query and then add some line breaks so that you can more easily see the structure of the resulting XML:
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XML_F52E2B61-18A1-11d1-B105-00805F49916B --------------------------------------------------------------<Inventory Inventoryid="5" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Cost="1295.0000" AcquisitionTypeID="1"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT" EqTypeId="1" ModelSDX="P632"/> </Inventory> <Inventory Inventoryid="6" EquipmentId="6" LocationId="2" StatusId="2" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Rent="200.0000" Lease="0.0000" AcquisitionTypeID="3"> <Equipment EquipmentId="6" Make="NEC" Model="V90" EqTypeId="1" ModelSDX="V000"/> </Inventory> <Inventory Inventoryid="8" EquipmentId="5" LocationId="2" StatusId="1" OwnerId="1" Lease="87.7500" AcquisitionTypeID="2"> <Equipment EquipmentId="5" Make="HP" Model="LaserJet 4" EqTypeId="7" ModelSDX="L262"/> </Inventory> <Inventory Inventoryid="12" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Lease="100.0000" AcquisitionTypeID="2"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT" EqTypeId="1" ModelSDX="P632"/> </Inventory> ...
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This time, the result is a simple nested XML tree. The structure of the XML document is based on the content of the From clause. The leftmost table is mapped to the top element; the second leftmost table is mapped as a subelement of the top element; the third leftmost table (if it exists) is mapped as a subelement of the second-level element, and so on. Again, table columns are mapped to the attributes of the element. If I now create a query that joins Inventory with all other lookup tables, I get a nested tree with a number of levels (see Figure 14-2).
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SQL Server 2000 Stored Procedure & XML Programming
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Figure 14-2
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An XML document with a number of levels
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In the preceding case, each Inventory element contains one Equipment element, which could be very useful for client applications. Each record from the main table is followed by the associated lookup (foreign key) records. The following example reverses the order of tables in the From clause and uses Left Join:
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Select * From Equipment Left Outer Join Inventory On Inventory.EquipmentId = Equipment.Equipmentid For XML Auto
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Now each record in the Equipment table is followed by a variable number of records from the Inventory table. There are records in the Equipment table that are
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14: Publishing Information Using SQLXML
not associated with any Inventory record and Equipment records that are associated with more than one Inventory record:
XML_F52E2B61-18A1-11d1-B105-00805F49916B ---------------------------------------------------------------<Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT" EqTypeId="1" ModelSDX="P632"> <Inventory Inventoryid="5" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Cost="1295.0000" AcquisitionTypeID="1"/> <Inventory Inventoryid="12" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Lease="100.0000" AcquisitionTypeID="2"/> </Equipment> <Equipment EquipmentId="2" Make="Sony" Model="Trinitron 17XE" EqTypeId="3" ModelSDX="T653"> <Inventory/> </Equipment> <Equipment EquipmentId="6" Make="NEC" Model="V90" EqTypeId="1" ModelSDX="V000"> <Inventory Inventoryid="6" EquipmentId="6" LocationId="2" StatusId="2" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Rent="200.0000" Lease="0.0000" AcquisitionTypeID="3"/> </Equipment> <Equipment EquipmentId="4" Make="HP" Model="LaserJet 4" EqTypeId="6" ModelSDX="L262"> <Inventory/> </Equipment> <Equipment EquipmentId="5" Make="HP" Model="LaserJet 4" EqTypeId="7" ModelSDX="L262"> <Inventory Inventoryid="8" EquipmentId="5" LocationId="2" StatusId="1" OwnerId="1" Lease="87.7500" AcquisitionTypeID="2"/> </Equipment> (6 row(s) affected)
You do not have to use column names as tag names. You can assign aliases to columns and these aliases will be mapped to the attributes.
SQL Server 2000 Stored Procedure & XML Programming
Aggregate Functions
Aggregate functions and the Group By clause are not supported in Auto mode. However, it is possible to use a simple workaround based on a derived table to pool such values in an XML document:
Select Inv.InventoryId, Inv.SumCost From (Select InventoryId, Sum(Cost) SumCost From Inventory Group By InventoryId) Inv For XML Auto
In this example, the inner Select statement returns the required data, and the outer Select statement functions as a wrapper with a For XML Auto clause. It is also possible to join the results from the inner Select statement with other tables to provide additional information.
Computed Columns
If the column list of the Select statement includes a column that cannot be directly associated with a table (such as a computed column), SQL Server will map it to the attribute (or subelement) at the nesting level that is current when the column is encountered in the list. For example, if a computed column is included as the first in the column list, it is added as an attribute (or a subelement) of the top element; if it is included after the columns of another table are referenced, the computed column is mapped at the second level.
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