Inflation class implementation
Many inflator operations are now easier to implement, as they can be replaced by the CustomisableObjInflator or CustomisableRelInflator class definitions. These classes have customizable columns so they can select from the OBJ or REL tables and the IF and PR tables, as well as filter with a set of property definition UIDs.
If only one table is required, the inflator automatically uses one-shot OBID criteria
for a potential performance gain.
The following is an example of the replacement of a light object inflation class.
Public Class LightObjInflator
Inherits CustomisableObjInflator
Implements IObjInflator
Public Sub New()
MyBase.New(
Nothing,
Nothing,
New List(Of String)({
"OBJOBID", "OBID", "PROPERTYDEFUID",
"STRVALUE", "UOM", "EXTENDEDIND"}),
New List(Of Integer)({1, 2}),
Nothing)
End Sub
End Class
Results counting class implementation
Previously, a data set returned with one row that contained a count of the results. By the time this row was reached in the code, an SQL statement had been executed to insert rows into the temporary database table.
The new implementation returns a Long value, rather than a data set, and uses the one-shot OBID criteria from the new results provider. Depending on which implementation of the IResultsProvider interface definition is supplied, it is possible that temp tables or IN lists are never used. Therefore, the whole count could be completed in one scalar query.
The following example in the new implementation shows that a post processor now counts the results of a query:
Public Class ObjCounter
Implements IPostProcessor(Of IObjResultsProvider, Long)
Public Function PostProcess(
ByVal pobjObjResultsProvider As IObjResultsProvider) As Long _
Implements IPostProcessor(Of IObjResultsProvider, Long).PostProcess
'
' Validate parameters.
'
If pobjObjResultsProvider Is Nothing Then
Throw New ArgumentNullException("pobjObjResultsProvider")
End If
'
' Build a "SELECT COUNT(*) FROM ..." SQL statement.
'
Dim lobjCountSql As New SPFSQL
lobjCountSql.Append("SELECT COUNT (*) FROM ")
lobjCountSql.Append(pobjObjResultsProvider.TablePrefix)
lobjCountSql.Append(pobjObjResultsProvider.TableSuffix)
lobjCountSql.Append(" oc WHERE oc.OBID IN (")
lojbCountSql.MergeSQL(
pobjObjResultsProvider.GetOneShotObidCriteria(),
pobjObjResultsProvider.DBProvider)
lobjCountSql.Append(")")
Return CLng(pobjObjResultsProvider.DBProvider.
ExecuteScalarQuery(lobjCountSql))
End Function
End Class
Usage and execution of new inflation classes
Usage is still handled in the same stack trace that processes edge expansion, queries, and so on, except for some slightly altered method signatures. These executions have the same stack trace up until the work is handed over to the IObjInflator implementations, which execute SQL statements, as shown in the following examples:
Create the inflation class passing in the query:
Dim lobjIFPRInflationClass As New SPF.Common.DataAccessLayer.DataRetrieval.ObjIFPRInflationClass(mobjCriteria)
Invoke the query:
Dim lobjResults As IObjectDictionary = Me.QueryObjects(FullObjInflator.Instance, -1, lobjContainer)