Creating Summarization Classes
This section describes how to create import-time summarization classes to aggregate data from a base class.
The purpose of a summarization class is to perform load-time aggregation based on different dimensions and to calculate meaningful measure data in an efficient way. The following list contains the specifications for a summarization class. A summarization class must:
- Be a class defined in the Data Warehouse schema.
- Specify a base class whose data will be aggregated.
- Contain one or more class members marked as dimensions or measures.
- Contain dimensions that specify expressions indicating how the dimensions should be extracted from the base class.
- Contain measures that specify expressions indicating how the measure should be computed from the base class.
- Have a key definition that consists of all the dimension members.
The dimension expressions for the summarization class must follow these guidelines:
All expressions must have the following syntax for each dimension expression in the summarization class:
dimension-expr := date-expr | member-val-expr | uri-expr date-expr := datepart(date-selector, a member in the base class of type datetime) date-selector := yy | yyyy | yyyyq | yyyymm | yyyymmdd | yyyymmddhh | yyyymmddhhmi | mm | hh | mi | ss | ms | q | yd | wd | mq member-val-expr := member-name uri-expr := uripart(uripart-selector, member of type URI) uripart-selector := site | protocol | extension | dir[n]All expressions must be one of the following: a date expression, a hash expression, a member value expression, or a URI expression.
All expressions need to specify the member name of the base class from which this dimension is derived.
If the expression is a date expression, the base member must be of type DateTime. Date-selector is to select the format and parts of a DateTime value that will be used as the dimension value in the aggregation class. For example, yy means that only the two-digit year part (for example, 99) of the base class DateTime member will be used as the dimension value in the aggregation class. Similarly, yyyy means that the four-digit year part (for example, 1999) will be used as the dimension value, mm means the two-digit month part, and so on.
If the expression is a hash expression, the base member must be a string, a GUID, or a binary. Hash-expression performs a hash on the base member's string/guid/binary value and uses the hash result as the dimension value of the aggregation class.
The member expression is simply a direct mapping from the base member to the dimension member of the summarization class. The base member needs to be a string that stores a valid HTTP URI.
Uri-expression can extract the different parts of a valid URI such as the site name, protocol (for example, HTTP or FTP), file extension (for example, .gif or .jpeg), or the nth level directory name and use it as the dimension value of the aggregation class.
For each measure in the summarization class, the measure expression must have the following syntax:
measure-expr := measure-func(member name in the base class) |
count(*)
measure-func := sum | min | max
The count(*) function sums all rows of the base class that match the dimensions of the summarization class. Distinct counts can be obtained by creating a base-level summarization class that consists of dimensions with no measures.
The following is a list of import-time summarization limitations:
- A summarization class cannot aggregate data from more than one base class.
- Each summarization class should have at least two dimensions that uniquely track each import, SiteID and the TaskID. Otherwise, the Data Warehouse accumulates errors due to duplicate keys in the final summarization tables.
- A summarization class can have a maximum of eight dimension members defined.
- A summarization class has no limit to the number of measure members supported.
- The uniqueness of each dimension as well as the number of summarization classes minimizes performance for both load time and resource utilizations.
Example
This section assumes that the reader is familiar with ADO and with OLE DB syntax, and knows how to define new classes, new members, and new relationships through the Commerce Server OLE DB provider. For more information, see Creating a New Class.
The following example defines two summarization classes, LogUsage and PageUsageUniqueGUID, and inserts them into the Data Warehouse schema, where the base class, Request, already exists. The sample also contains some utility functions that handle the necessary schema changes.
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Public Const fPrimaryKey = 1
Public Const fMultiValued = 2
Public Const fHasDefaultVal = 4
Public Const fIsRequired = 8
Public Const fIsJoinKey = 16
Public Const fDontClear = 32
Public Const fGenerateColDef = 64
Public Const fIsUniqueKey = 128
Public Const fIsIdentityMember = 256
'--- Flags for clsdef
Public Const fGenerateIdentity = &H1
Public Const fGenerateTableDef = &H2
Public Const fGenerateKeyDef = &H4
Public Const fGeneratePartDef = &H8
Public Const fIsAbstract = &H10
Public Const fHasAggrExp = &H100 'member is aggregate
Public Const fIsDimension = &H1000
Public Const fIsMeasure = &H10000
Main
Sub Main()
'Create an ADO connection object
Dim objConn
Set objConn = CreateObject("ADODB.Connection.2.5")
'Create an ADO command object.
Dim cmdCommand
Set cmdCommand = CreateObject("ADODB.Command.2.5")
'Create an ADO record object.
Dim recNew
Set recNew = CreateObject("ADODB.Record.2.5")
'Open a connection (bind) to the provider.
'Modify the values for Catalog, Database, User, and Password to
'match your resources.
objConn.Open "URL=mscop://InProcConnect/Server=servername:" & _
"Catalog=DWSchema:Database=database: Trusted_Connection=Yes:" & _
"FastLoad=True"
'Set the connection in the command object
Set cmdCommand.ActiveConnection = objConn
'Turn on "Schema Change" mode
cmdCommand.CommandText = "SchemaMode=1"
cmdCommand.Execute
'Create the first aggregate
'Modify the values passed to match your Catalog and SourceDef settings.
CreateLogUsageAggregate objConn, "DWSchema", "test_Source"
'Create the second aggregate
'Modify the values passed to match your Catalog and SourceDef settings.
CreatePageUsageUniqueGUIDAggregate objConn, "DWSchema", "test_Source"
'------------------------------------------------
' Commit Schema
'------------------------------------------------
cmdCommand.CommandText = "CommitSchema"
cmdCommand.Execute
'Turn on "Schema Change" mode
cmdCommand.CommandText = "SchemaMode=0"
cmdCommand.Execute
End Sub
Sub CreateLogUsageAggregate(objConn, strCatalog, strSrcDef)
'create aggr class
strAggClassName = "LogUsage"
strBaseClassName = "Request"
'Modify the values passed below to match your Catalog and SourceDef
'settings.
CreateClassDef objConn, strAggClassName, "DWSchema", "test_Source", _
strBaseClassName, false
'-- Dimension1 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "Date"
strMemDefType = "FILETIME"
strDefVal = "1900-1-1 0:0:0.0"
strAggrExp = "datepart(yyyymmddhh, Timestamp)"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension2 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "urikey"
strMemDefType = "UUID"
strDefVal = "{00000000-0000-0000-0000-000000000000}"
strAggrExp = "uriKey"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension3 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "IsRequest"
strMemDefType = "SHORT"
strDefVal = "0"
strAggrExp = "IsRequest"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, true
'-- Dimension4 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "Win32Status"
strMemDefType = "ULONG"
strDefVal = "0"
strAggrExp = "Win32Status"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension5 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "ReferrerDomainName"
strMemDefType = "WSTR"
strDefVal = "Unknown"
strAggrExp = "ReferrerDomainName"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension6 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "UserAgentName"
strMemDefType = "WSTR"
strDefVal = "Unknown"
strAggrExp = "UserAgentName"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension7 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "SiteName"
strMemDefType = "WSTR"
strDefVal = "Unknown"
strAggrExp = "SiteName"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension8 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "TaskID"
strMemDefType = "LONG"
strDefVal = "0"
strAggrExp = "TaskID"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Measure1 : create the measure
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsMeasure
strMemDef = "RequestCount"
strMemDefType = "LONG"
strDefVal = "0"
strAggrExp = "count(*)"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, true
'-- Relation1 : create the relationship to a dimension class
strClsParent = "Date"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "DTimestamp"
strChildMem = "Date"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation2 : create the relationship to a dimension class
strClsParent = "uri"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "urikey"
strChildMem = "urikey"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation3 : create the relationship to a dimension class
strClsParent = "referrerdomain"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "ReferrerDomainName"
strChildMem = "ReferrerDomainName"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation4 : create the relationship to a dimension class
strClsParent = "useragent"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "UserAgentName"
strChildMem = "UserAgentName"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation5 : create the relationship to a dimension class
strClsParent = "win32status"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "Win32Status"
strChildMem = "Win32Status"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation6 : create the relationship to a dimension class
strClsParent = "site"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "SiteName"
strChildMem = "SiteName"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation7 : create the relationship to a dimension class
strClsParent = "taskhistory"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "TaskID"
strChildMem = "TaskID"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Creating the key definition for this aggregate, this is going to
'-- be consisted of all the dimension members.
strKeyDefName = strAggClassName + "Key"
CreateKeyDef objConn, strAggClassName, strKeyDefName
strMemDefName = "DateID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 0
strMemDefName = "IsRequest"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 1
strMemDefName = "Win32StatusID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 2
strMemDefName = "SiteID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 3
strMemDefName = "TaskHistoryID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 4
strMemDefName = "ReferrerDomainID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 5
strMemDefName = "UserAgentID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 6
strMemDefName = "uriID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 7
End Sub
Sub CreatePageUsageUniqueGUIDAggregate(objConn, strCatalog, strSrcDef)
'create aggr class
strAggClassName = "PageUsageUniqueGUID"
strBaseClassName = "Request"
'Modify the values passed below to match your Catalog and SourceDef settings.
CreateClassDef objConn, strAggClassName, "DWSchema", "test_Source", _
strBaseClassName, false
'-- Dimension1 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "DTimestamp"
strMemDefType = "FILETIME"
strDefVal = "1900-1-1 0:0:0.0"
strAggrExp = "datepart(yyyymmddhh, Timestamp)"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension2 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "urikey"
strMemDefType = "UUID"
strDefVal = "{00000000-0000-0000-0000-000000000000}"
strAggrExp = "uriKey"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension3 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "userKey"
strMemDefType = "UUID"
strDefVal = "{00000000-0000-0000-0000-000000000000}"
strAggrExp = "userKey"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension4 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "SiteName"
strMemDefType = "WSTR"
strDefVal = "Unknown"
strAggrExp = "SiteName"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Dimension5 : create dimension
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsDimension
strMemDef = "TaskID"
strMemDefType = "LONG"
strDefVal = "0"
strAggrExp = "TaskID"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, false
'-- Measure1 : create the measure
lMemFlags = fGenerateColDef + fHasDefaultVal + fIsMeasure
strMemDef = "RequestCount"
strMemDefType = "ULONG"
strDefVal = "0"
strAggrExp = "count(*)"
CreateMemberDef objConn, strAggClassName, strMemDef, strMemDefType , _
lMemFlags , strDefVal,strAggrExp, true
'-- Relation1 : create the relationship to a dimension class
strClsParent = "Date"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "DTimestamp"
strChildMem = "DTimestamp"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation2 : create the relationship to a dimension class
strClsParent = "uri"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "urikey"
strChildMem = "urikey"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation3 : create the relationship to a dimension class
strClsParent = "loguser"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "userkey"
strChildMem = "userkey"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation4 : create the relationship to a dimension class
strClsParent = "site"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "SiteName"
strChildMem = "SiteName"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Relation5 : create the relationship to a dimension class
strClsParent = "taskhistory"
strRelName = strClsParent + strAggClassName
CreateRelDef objConn , strRelName , strClsParent , strAggClassName , _
strClsParent + "Key" , 2
strParentKeyMem = "TaskID"
strChildMem = "TaskID"
CreateRelMemDef objConn, strRelName, strParentKeyMem, strChildMem
'-- Creating the key definition for this aggregate, this is going to
'-- be consisted of all the dimension members.
strKeyDefName = strAggClassName + "Key"
CreateKeyDef objConn, strAggClassName, strKeyDefName
strMemDefName = "DateID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 0
strMemDefName = "SiteID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 1
strMemDefName = "TaskHistoryID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 2
strMemDefName = "loguserID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 3
strMemDefName = "uriID"
CreateKeyMemberDef objConn, strKeyDefName, strMemDefName, 4
End Sub
'-------------------------------------------------------------------------
' Procedure : CreateClassDef
' Parameters : objConn
' strClsDef - name of classdef to be created
' strCatalog - catalog in which we want to create
' strSrcDef - source definition name
' strBaseClsName - this is useful for aggregations
' simple classes can pass ""
' bGenKeyDef = true - generate key definition automatically
' Notes : The Schema change mode should have been set to true prior to
' calling this function
'
'-------------------------------------------------------------------------
Sub CreateClassDef(objConn, strClsDef, strCatalog, strSrcDef, strBaseClsName, bGenKeyDef)
WScript.Echo "DBG: Class : " & strClsDef
Dim rec
Set rec = CreateObject("ADODB.Record.2.5")
rec.Open "Class/" & strClsDef, objConn, 3, adCreateOverwrite
rec("IsPersistent") = 1
rec("ClassDefName") = strClsDef
rec("SourceDefName") = strSrcDef
rec("GeneratePartitionDef") = 1
rec("GenerateTableDef") = 1
If bGenKeyDef Then
rec("GenerateKeyDef") = 1
Else
rec("GenerateKeyDef") = 0
End If
'to create an aggregate class --
If strBaseClsName <> "" Then
rec("BaseClassName") = strBaseClsName
End If
rec("GenerateIdentity") = 1
rec("__Commit") = 1
rec.Fields.Update
rec.Close
End Sub
'-------------------------------------------------------------------------
' Procedure : CreateMemberDef
' Purpose : Utility to create members
' Parameters : objConn
' strClsDef - name of classdef
' strMemDef - name of member
' strMemDefType - type of the memberdef
' lMemFlags - MemberDef Creation flags
'
' Notes : User should to set the schema mode to updatable and reset
' after the member is created.
'-------------------------------------------------------------------------
Sub CreateMemberDef(objConn, strClsDef, strMemDef, strMemDefType , lMemFlags , strDefVal,strAggrExp, isPersistent)
Dim rec
' On Error Resume Next
WScript.Echo "DBG: Mem : " & strMemDef
set rec = CreateObject("ADODB.Record.2.5")
rec.Open "Member/" & strClsDef & "/" & strMemDef, objConn, adModeReadWrite, adCreateOverwrite
rec("MemberDefName") = strMemDef
If (lMemFlags And fGenerateColDef) > 0 Then 'default case
rec("GenerateColumnDef") = 1
End If
If (lMemFlags And fPrimaryKey) > 0 Then
rec("IsPrimaryKey") = 1
End If
If (lMemFlags And fMultiValued) > 0 Then
rec("IsMultiValued") = 1
End If
If (lMemFlags And fHasDefaultVal) > 0 Then
rec("DefaultValueAsStr") = strDefVal
End If
If (lMemFlags And fIsUniqueKey) > 0 Then
rec("IsUniqueKey") = 1
End If
If (lMemFlags And fIsIdentityMember) > 0 Then
rec("IsIsIdentityMember") = 1
End If
If isPersistent Then
rec("isPersistent") = 1
Else
rec("isPersistent") = 0
End If
'member aggregate - then set the aggregate expression
'if (lMemFlags And fHasAggrExp) > 0 then
' rec("ExpressionStr") = strAggrExp
'End if
if (lMemFlags And fIsDimension) > 0 then
rec("IsDimension") =1
rec("ExpressionStr") = strAggrExp
End if
if (lMemFlags And fIsMeasure ) > 0 then
rec("IsMeasure") = 1
rec("ExpressionStr") = strAggrExp
End if
rec("TypeName") = strMemDefType
rec("__Commit") = 1
rec.Fields.Update
rec.Close
End Sub
'-------------------------------------------------------------------------
' Procedure : CreateRelationDef
' Purpose : create a Relation Definitin
' Notes : The classes Parent and child referred to must exist. The
' Keydefinition for the parent must exist (1-M)
'
'-------------------------------------------------------------------------
Sub CreateRelDef(objConn , strRelName , strClsParent , strClsChild , _
strKeyParent , iRelType )
Dim rec
'On Error Resume Next
WScript.Echo "DBG: Rel : " & strRelName
set rec = CreateObject("ADODB.Record")
rec.Open "Relation/" & strRelName, objConn, adModeWrite, _
adCreateOverwrite
rec("ParentClassName") = strClsParent
rec("ParentClasskey") = strKeyParent
rec("ChildClassName") = strClsChild
rec("RelType") = iRelType
rec("__Commit") = 1
rec.Fields.Update
rec.Close
Set rec = Nothing
End Sub
'-------------------------------------------------------------------------
' Procedure : CreateRelMemDef
' Purpose : Create a Relation Member Definition : Associate key member in
' parent with another member in child, similar to a foreign
' key.
' strParentKeyMem - key of the parent
' strChildMem - member which is same type as parent, which
' serves as foreign key in the child
'
'-------------------------------------------------------------------------
Sub CreateRelMemDef( objConn, strRelName, strParentKeyMem, strChildMem )
Dim rec
'On Error Resume Next
set rec = CreateObject("ADODB.Record")
rec.Open "RelMember/" & strRelName &"/" & strParentKeyMem & "/" & _
strChildMem, objConn, adModeReadWrite, adCreateOverwrite
rec("ChildMemName") = strChildMem
rec("ParentMemName") = strParentKeyMem
rec("__Commit") = 1
rec.Fields.Update
rec.Close
End Sub
'-----------------------------------------------------------------------
' Procedure : CreateKeyDef
' Purpose : Create a key definition
' Notes : Can create a keydefinition only if the ClassDef has been
' created with
' GenerateKeyDef = 0
' Schema change mode should be enabled prior to calling this
' function.
'------------------------------------------------------------------------
Sub CreateKeyDef( objConn, strClsDef, strKeyDefName)
Dim rec
'On Error Resume Next
set rec = CreateObject("ADODB.Record")
rec.Open "Key/" & strKeyDefName,objConn, adModeReadWrite, adCreateOverwrite
rec("ClassDefName") = strClsDef
rec("__Commit") = 1
rec.Fields.Update
rec.Close
End sub
'-----------------------------------------------------------------------
' Procedure : CreateKeyMemberDef
' Purpose : Create a key definition
' Notes : Can create a keydefinition only if the ClassDef has been
' created with
' GenerateKeyDef = 0
'------------------------------------------------------------------------
Sub CreateKeyMemberDef( objConn, strKeyDefName, strMemDefName, iOrdinalPosInKey)
Dim rec
'On Error Resume Next
set rec = CreateObject("ADODB.Record")
rec.Open "KeyMember/" & strKeyDefName & "/" & strMemDefName ,objConn, adModeReadWrite, adCreateOverwrite
rec("KeyDefName") = strKeyDefName
rec("MemDefName") = strMemDefName
rec("OrdinalPosInKey") = iOrdinalPosInKey
rec("__Commit") = 1
rec.Fields.Update
rec.Close
End sub
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Copyright © 2005 Microsoft Corporation.
All rights reserved.