Using DiffGrams to Insert Data in .NET framework

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Using DiffGrams to Insert Data
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DiffGrams that insert data do not need the diffgr:before element. All elements (records) inside the DataSetName element (CompleteInventory in the following case) must have diffgr:hasChanges="inserted".
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SQL Server 2000 Stored Procedure & XML Programming
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< xml version='1.0' > <AddInv xmlns:sql='urn:schemas-microsoft-com:xml-sql' sql:mapping-schema='Inventory.xsd'> <diffgr:DiffGram xmlns:msdata='urn:schemas-microsoft-com:xml-msdata' xmlns:diffgr='urn:schemas-microsoft-com:xml-diffgram-v1'> <CompleteInventory> <Inventory diffgr:id='Inventory1' diffgr:hasChanges='inserted'> <EquipmentId>246</EquipmentId> <LocationId>14</LocationId> <StatusId>4</StatusId> <LeaseId>8</LeaseId> <LeaseScheduleId>185</LeaseScheduleId> <OwnerId>161</OwnerId> <Lease>2209</Lease> <AcquisitionTypeID>2</AcquisitionTypeID> </Inventory> </CompleteInventory> </diffgr:diffgram> </AddInv>
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Identity and uniqueidentifier columns must be treated uniquely in DiffGrams. You cannot simply skip these columns because SQL Server would interpret that as a null value. You must set sql:identity and sql:guid annotations for those fields. The annotations use these values: Annotation
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sql:identity="ignore" sql:identity="useValue" sql:guid="generate" sql:guid="useValue"
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Ignore value supplied by DiffGram Identity constraint will set the value. You can even omit the value in DiffGram. Use value from DiffGram (similar to Set Identity_Insert On). SQL Server will generate value behind the scenes using the NewID() function. The value can be omitted in DiffGram. Use value from DiffGram.
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Unfortunately, it is not possible to retrieve and use identity values from SQL Server using DiffGrams.
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15: Modifying Databases Using SQLXML
The following schema maps the Inventory element to the InventoryBulkLoad table. The Identity field will be passed as an attribute and SQL Server will ignore the value if it is set in the DiffGram.
< xml version="1.0" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="Inventory" sql:relation="InventoryBulkLoad"> <xsd:complexType> <xsd:sequence> <xsd:element name="EquipmentId" type="xsd:int" minOccurs="1" /> <xsd:element name="LocationId" type="xsd:int" minOccurs="1" /> <xsd:element name="StatusId" type="xsd:unsignedByte" minOccurs="1" /> <xsd:element name="LeaseId" type="xsd:int" minOccurs="0" /> <xsd:element name="LeaseScheduleId" type="xsd:int" minOccurs="0" /> <xsd:element name="OwnerId" type="xsd:int" minOccurs="1" /> <xsd:element name="Rent" type="xsd:decimal" minOccurs="0" /> <xsd:element name="Lease" type="xsd:decimal" minOccurs="0" /> <xsd:element name="Cost" type="xsd:decimal" minOccurs="0" /> <xsd:element name="AcquisitionTypeID" type="xsd:unsignedByte" minOccurs="1" /> </xsd:sequence> <xsd:attribute name="InventoryId" type="xsd:integer" sql:field="InventoryId" sql:identity="ignore" /> </xsd:complexType> </xsd:element> </xsd:schema>
Using DiffGrams to Update Data
DiffGrams that update data need to have both the DataSetName and diffgr: before elements populated. Elements in the DataSetName element must have diffgr:hasChanges="modified" or they will be ignored. Elements in the DataSetName and corresponding diffgr:before elements must be linked using the diffgr:id attribute. In the following example, I am trying to change the StatusID of the record. The DataSetName element is again called CompleteInventory.
<Root xmlns:sql="urn:schemas-microsoft-com:xml-sql" sql:mapping-schema="InventoryUseId.xsd"> <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <CompleteInventory> <Inventory diffgr:id="Inventory1"
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msdata:rowOrder="0" diffgr:hasChanges="modified"> <Inventoryid>3</Inventoryid> <EquipmentId>246</EquipmentId> <LocationId>14</LocationId> <StatusId>2</StatusId> <LeaseId>8</LeaseId> <LeaseScheduleId>185</LeaseScheduleId> <OwnerId>161</OwnerId> <Lease>2209</Lease> <AcquisitionTypeID>2</AcquisitionTypeID> </Inventory> </CompleteInventory> <diffgr:before> <Inventory diffgr:id="Inventory1" msdata:rowOrder="0"> <Inventoryid>3</Inventoryid> <EquipmentId>246</EquipmentId> <LocationId>14</LocationId> <StatusId>4</StatusId> <LeaseId>8</LeaseId> <LeaseScheduleId>185</LeaseScheduleId> <OwnerId>161</OwnerId> <Lease>2209</Lease> <AcquisitionTypeID>2</AcquisitionTypeID> </Inventory> </diffgr:before> </diffgr:diffgram> </Root>
Both copies of the record have all fields defined. This forces SQL Server to check if someone has changed the record in the meanwhile (optimistic concurrency control ). It is not possible to force SQL Server to do pessimistic locking (because of the disconnected nature of the system). It is also impossible to ignore changes on the record by dropping elements from the diffgr:before element. SQL Server will consider those columns as null and no record will match the criteria. You cannot use an XSD schema with sql:identity="ignore" in a DiffGram to update a record. SQL Server would replace the identity value with null and the update would fail. You must create a new schema that contains sql:identity= "useValue":
< xml version="1.0" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
15: Modifying Databases Using SQLXML
xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="Inventory" sql:relation="InventoryBulkLoad"> <xsd:complexType> <xsd:sequence> <xsd:element name="Inventoryid" sql:field="InventoryId" type="xsd:integer" sql:identity="useValue" /> <xsd:element name="EquipmentId" type="xsd:int" minOccurs="1" /> <xsd:element name="LocationId" type="xsd:int" minOccurs="1" /> <xsd:element name="StatusId" type="xsd:unsignedByte" minOccurs="1" /> <xsd:element name="LeaseId" type="xsd:int" minOccurs="0" /> <xsd:element name="LeaseScheduleId" type="xsd:int" minOccurs="0" /> <xsd:element name="OwnerId" type="xsd:int" minOccurs="1" /> <xsd:element name="Rent" type="xsd:decimal" minOccurs="0" /> <xsd:element name="Lease" type="xsd:decimal" minOccurs="0" /> <xsd:element name="Cost" type="xsd:decimal" minOccurs="0" /> <xsd:element name="AcquisitionTypeID" type="xsd:unsignedByte" minOccurs="1" /> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
Using DiffGrams to Delete Data
To delete a record using DiffGram, reference the record only in the diffgr:before block. The other element will be empty:
<Root xmlns:sql="urn:schemas-microsoft-com:xml-sql" sql:mapping-schema="Inventory.xsd"> <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <CompleteInventory /> <diffgr:before> <Inventory diffgr:id="Inventory1" msdata:rowOrder="0"> <Inventoryid>83</Inventoryid> <EquipmentId>246</EquipmentId> <LocationId>14</LocationId> <StatusId>4</StatusId> <LeaseId>8</LeaseId> <LeaseScheduleId>185</LeaseScheduleId> <OwnerId>161</OwnerId> <Lease>2209</Lease> <AcquisitionTypeID>2</AcquisitionTypeID> </Inventory> </diffgr:before>
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