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A nested XML tree as a result of a query
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SQL Server 2000 Stored Procedure Programming
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mapped as a subelement of the second-level element, and so on. Again, table columns are mapped to the attributes of the element. If we now create a query that joins Inventory with all other lookup tables, we get a nested tree with a number of levels (see Figure 12-4). 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. Let s reverse the order of tables in the From clause and use 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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Figure 12-4.
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An XML document with a number of levels
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XML Support in SQL Server 2000
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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 Equipment records that are not associated with anything and Equipment records that are associated with more than one Inventory record:
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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)
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You can see result of the execution in Figure 12-5.
SQL Server 2000 Stored Procedure Programming
Figure 12-5.
An XML document with a variable number of matched records
TIP: You do not have to use column names as tag names. You can assign aliases to columns and these aliases will be mapped to attributes.
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 nested subqueries to pool such values into an XML document.
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Select Inv.InventoryId, Inv.SumCost From (Select InventoryId, Sum(Cost) SumCost From Inventory Group By InventoryId) Inv For XML Auto
In the preceding example, the inner Select table produces all required information and the outer Select functions as a wrapper with a For XML Auto clause. It is also possible to join the inner Select statement with other tables to provide additional information. If the column list of the Select statement references a column that cannot be associated with any table (such as computed columns), SQL Server will map it to the attribute (or subelement) at the deepest nesting level that is present when the column is encountered in the list. For example, if a column is referenced as first in the column list, it is added as an attribute (or a subelement) of the top element; if a computed column is referenced after the columns of two other tables are referenced, the columns are mapped at the second level.
The Elements Option
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 resultset of the following query in Figure 12-6. Nested tables are also encoded as subelements.
Select * From Inventory Inner Join Equipment On Inventory.EquipmentId = Equipment.Equipmentid For XML Auto, Elements
NOTE: The Elements option is supported only in Auto mode.
SQL Server 2000 Stored Procedure Programming
Figure 12-6.
Use of the Elements option in the For XML clause
The XMLData Option
If the XMLData option is specified in the For XML clause, the XML document also contains an XML-Data schema:
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"
12:
XML Support in SQL Server 2000
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"/> <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 will also get an attribute with a reference to a schema:
xmlns="x-schema:#Schema"
TIP: 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 datatype collisions.
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