programming with bapis in visual basic
DESCRIPTION
Old Guide for Programming with BAPIsTRANSCRIPT
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SAP Labs, Inc. and ARAsoft GmbH SAP TechEd 2000 June 20–23, 2000 BAPI03.ppt/ 1
Robert Chu (www.sap.com)Thomas G. Schuessler (www.arasoft.de)
Programming with BAPIs in Visual Basic (Advanced)
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SAP Labs, Inc. and ARAsoft GmbH SAP TechEd 2000 June 20–23, 2000 BAPI03.ppt/ 2
First things first...
Copied from www.blackjackcharts.com
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SAP Labs, Inc. and ARAsoft GmbH SAP TechEd 2000 June 20–23, 2000 BAPI03.ppt/ 3
Overview
l DCOM Connector Overview
l Programming Steps
l Advanced Concepts
l Exercise
l More Information
l Questions and Answers
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SAP Labs, Inc. and ARAsoft GmbH SAP TechEd 2000 June 20–23, 2000 BAPI03.ppt/ 4
DCOM Connector Overview
l Access to BAPIs and other RFMs (RFC-enabled Function Modules)
l Alternative to the SAP ActiveX controls
l Smaller client footprint
l Better performance
l Uses generated proxy classes (C++) to
n Avoid runtime metadata retrieval
n Support IntelliSense
l Support for ActiveX Data Objects (ADO)
n Used for structure and table parameters
n Data binding with ADO-aware ActiveX controls
l Use with or without MTS
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Fully distributable, scalable n-tier architecture
Intranet Client
Dynamic HTML, Java
Internet Client
Dynamic HTML via ASP and/or Remote Data Service (RDS) etc.
WebServer
Fat Client
Visual Basic, C++, Java
Microsoft Transaction Server
Language-neutral,strongly-typed interfaces
Common Programming Model
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Installation
l Use 4.6C or later version of SDC regardless of the back-end R/3 release.
l DCOM Connector can be installed with or without Microsoft Transaction Server (MTS).
l MTS recommended for high-volume Internet/Intranet applications.
l Microsoft Visual C++ 6.0 required to generate proxies.
l Visual Studio Service Pack 3 highly recommended.
l Internet Explorer required for administration.
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System Administration
l Define destinations
n Supports load balancing (logon groups) and individual application servers.
l Generate business object and RFM proxiesRFM = RFC-enabled Function Module
l BAPIs and non-BAPI RFMs cannot be generated into the same DLL.
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Proxy Generation
l The make file name (C++ Project) determines the DLL name, e.g.T46BCompanyCodeProject.mak will result in T46BCompanyCodeProject.dll.
l The file name of the DLL can be changed later.
l The Namespace parameter and the make file name determine the component name (Type Library name) in VB, e.g.
n Dim oCompanyCode As _T46BCompanyCodeProjectLib.CompanyCode
l The Namespace parameter determines the ProgId, e.g.
n Set oCompanyCode = _oSession.CreateInstance("T46B.CompanyCode")
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References in the VB Project
l Microsoft ActiveX Data Objects Recordset 2.1 Library(msador15.dll)
l Generated business object proxies and RFM proxies
l SAP: Remote Function Call: COM support 1.0 Type Library(librfc32.dll)
n Required only if you want to use
w RfcSession
w RfcGuiSink
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SAP Labs, Inc. and ARAsoft GmbH SAP TechEd 2000 June 20–23, 2000 BAPI03.ppt/ 10
Programming Steps I
l Define Session objectn Global oSession As CompanyCodeProjectSessionComponent
l Create Session objectn Set oSession = New CompanyCodeProjectSessionComponent
l Set session information / logonn oSession.PutSessionInfo _
Destination:="<destination name", _UserID:="<userid>", Password:="<password>", _Client:="<client>", Language:="<language code>"
n If oSession.Logon(sLogonError) Then
String parameter contains error information.
n Alternative: Use a visual logon component, e.g. freeware atwww.sap.com/solutions/technology/bapis/com/ara_dcom_2.zip
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Programming Steps II
l Create business object proxies
n Dim oCompanyCode As _ T46BCompanyCodeProjectLib.CompanyCode
Set oCompanyCode = _oSession.CreateInstance("T46B.CompanyCode")
l Set key fields for instance BAPIs
n oCompanyCode.InitKeys "0001"
Calling the InitKeys method does not check the existence of the particular record in the R/3 database.
Call an instance method BAPI like ExistenceCheck or GetDetail instead.
Keys are read-only properties of the proxy object.
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Programming Steps III
l Create structure/table parameter recordsets for import parameters
n Dim rsCompanyCodeList As RecordsetCall oCompanyCode.DimAs("BapiGetList", _"CompanyCodeList", rsCompanyCodeList)
Not required in this case, since CompanyCodeList is anexport-only table.
BAPI and parameter name parameters are case-sensitive!
l Fill import structure/table parameters using ADO
l Call the BAPI
n Dim rsReturn As RecordsetoCompanyCode.BapiGetList _CompanyCodeList:=rsCompanyCodeList, _Return:=rsReturn
BAPI name must be prefixed by "Bapi".
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Programming Steps IV
l Check the return code
n If Not (rsReturn("TYPE") = "S" Or _rsReturn("TYPE") = "I" Or _rsReturn("TYPE") = "") Then
MsgBox rsReturn("TYPE") & rsReturn("CODE") & ":" & _rsReturn("MESSAGE")
Exit SubEnd If
l Use the returned data
n Set DataGrid1.DataSource = rsCompanyCodeList
l Empty tables are returned as Nothing, not as recordsets with no rows.
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Visual Logon Component Client Code
Dim oSession As SessionComponent
Dim sErrorMessage As String
Dim ldSuccess As ARAsoftDLC.LOGONDIALOGRESULT
Set oSession = New SessionComponent
ldSuccess = ARAsoftDLC.LogonDialog(oSession, sErrorMessage)
If ldSuccess = Success Then
MsgBox "Okay"
ElseIf ldSuccess = Failure Then
MsgBox sErrorMessage
ElseIf ldSuccess = Cancel Then
' User cancelled the logon dialog
End If
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Advanced Concepts
l Transaction handling
l Connection properties
l Debugging
l Data conversion
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Transaction Handling
l All 3.1 update BAPIs execute their own COMMIT WORK.
l BAPIs since 4.0 are not supposed to do this.
l Double-check which category the BAPIs you want to use fall into.
n There is no metadata attribute for this
n Read the documentation
n OSS Note 131838 should list all BAPIs that execute their own COMMIT WORK
n If in doubt, test...
l Be careful when using BAPIs from both categories in the same session.
l Your own BAPIs must use the Update Task to support the new concept.
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Commit/Rollback BAPIs
l Supported starting with 4.5 by the BapiService methods
n TransactionCommit w WAIT parameter allows the client program to wait for the
completion of the Update Task.This can severely impact performance!w Return parameter (filled only when WAIT = "X")
n TransactionRollback
l Supported starting with 4.0 by the RFC-enabled functions modules
n BAPI_TRANSACTION_COMMIT n BAPI_TRANSACTION_ROLLBACK
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Transaction Handling in SDC
l Commit and Rollback are methods of the RfcSession object
n oSession.CommitWork
n oSession.CommitWorkAndWait (not implemented)
n oSession.RollbackWork
l Alternative: Use the appropriate BAPIs of BapiService
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Connection Properties
l Function GetConnectionAttribute([AttrName As String])
n Returns one attribute (as a Variant) or, if attribute name is omitted, a recordset.
n Dim rsX As RecordsetSet rsX = oSession.GetConnectionAttribute
l Most important fields
n DESTINATION
n SYSID
n PARTNER_HOST
n SYSTNR
n USER
n PARTNER_REL
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Debugging
l Client side
n RFC trace
w "trace=1" in the destination string
w Writes to file rfcnnnnn_nnnnn.trcn Component to display recordsets during debugging
l Server side
n Debug ABAP code
n Requires SAP-GUI and some ABAP Workbench knowledge
w Dim oSink As RfcGuiSinkSet oSink = New RfcGuiSinkoCompanyCode.AdviseRfcGuiSink oSink, 1, 0
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The BapiService Object I
l Support functions for BAPI programming
l BAPIs (4.0)
n DataConversionInt2Ext
n DataConversionExt2Int
l Additional BAPIs (4.5A)
n ApplicationLogGetDetail
n FieldhelpGetDocu
n InterfaceGetDocu
n MessageGetDetail
n TransactionCommit
n TransactionRollback
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The BapiService Object II
l Additional BAPIs (4.5B)
n DataConversionExt2int1 (sic!)
n DataConversionInt2Ext1
l Additional BAPIs (4.6)
n HyperLinkGetText
l Renamed BAPIs (4.6)
n DataConversionExt2Int1 (sic!)
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Conversion BAPIs
l BAPIs often deliver and require the internal SAP data format.
l Examples:
n Customer numbers
n Material numbers
n Language-dependent codes
w Units of measure etc.
l Check the conversion exit field of a field's domain to determine whether conversion is required.
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DataConversionInt2Ext
l Converts internal to external format
l Parameters
n Data (table)
w OBJTYPE Internal name of object w OBJNAME "Official" name of object w METHOD Name of BAPI w PARAMETER Name of parameter w FIELD Field name in structure or table w ROWNUMBER Row number in this tablew INT_FORMAT Internal format to be convertedw EXT_FORMAT Result in external format
n Return (table)
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DataConversionExt2Int
l Converts external to internal format
l Parameters
n Data (table)
w OBJTYPE Internal name of object w OBJNAME "Official" name of object w METHOD Name of BAPI w PARAMETER Name of parameter w FIELD Field name in structure or table w ROWNUMBER Row number in this tablew INT_FORMAT Result in internal formatw EXT_FORMAT External format to be converted
n Return (table)
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Exercise 1
l Build a DcomServices component for DCOM Connector, Part 1
l Retrieve connection information for the current session
l Open project group CompanyCode 2.vbg
l Follow the instructions in the template (GlobalServices).
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Exercise 2
l Build a DcomServices component for DCOM Connector, Part 2
l Display a recordset during debugging
l Open project group CompanyCode 2.vbg
l Follow the instructions in the template (Debugging).
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Exercise 3
l Display the ISO language code for this company code in the Detail form.
l Use the appropriate conversion BAPI (DataConversionInt2Ext1).
l Open project CompanyCode 3.vbp
l Follow the instructions in the template (form fmDetail)
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ARAsoft Windows Products I
l ARAsoft Metadata Server for SAP R/3
n Supports 3.1 - 4.6
n Retrieves all(!) metadata available in R/3
n Uses the RFC ActiveX Control
n Can only be licensed by software companies
n Can be ported to DCOM Connector and Java upon request
l ARAsoft BAPI Debugging Library
n Helps debugging ActiveX Controls- and SDC-based applications
n Evaluation copy athttp://www.sap.com/solutions/technology/bapis/com/aradebug.zip
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ARAsoft Windows Products II
l ARAsoft ADO SAP Table Library
n For ActiveX Control-based applications
n Makes SAP Table objects look like ADO recordsets
l ARAsoft OIW Library
n For ActiveX Control-based applications
n Encapsulates access to the OIW BAPIs
l ARAsoft Product Catalog Component
n For ActiveX Control-based applications
n Encapsulates access to the ProductCatalog BAPIs
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ARAsoft Windows Products III
l ARAsoft BAPI Support Library
n For ActiveX Control-based applications
n Support for
w Structures, Fields
w Helpvalues
w Conversions
w SAP Systems (saplogon.ini)
w many other functions
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ARAsoft Windows Products IV
l ARAsoft DCOM Connector Destination Manager for SAP R/3
n Freeware
n Download fromhttp://www.sap.com/solutions/technology/bapis/com/ara_dest.zip
l ARAsoft DCOM Connector Logon Component for SAP R/3
n Freeware
n Download fromhttp://www.sap.com/solutions/technology/bapis/com/ara_dcom_2.zip
n Source code can be purchased
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ARAsoft Windows Products V
l ARAsoft DCOM BAPI Object Factory for SAP R/3
n Support for
w Structure, Fieldsw Helpvaluesw Matchcodesw Conversionsw Destinationsw Metadataw Open Information Warehousew Product Catalogw Error handling
n Includes
w ARAsoft Visual Matchcode Componentw ARAsoft Structure Browserw ARAsoft Helpvalues Browser
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ARAsoft Java BAPI Object Factory for SAP R/3 I
l Encapsulates all difficult / error-prone / performance-related aspects of BAPI/RFM programming, e. g.
n Check tables (Helpvalues), conversions, metadata
l Significantly reduces the amount of SAP know-how developers need to build world-class applications.
l Significantly speeds up development projects.
l Significantly reduces maintenance and R/3 release upgrade cost.
l Provides release-independence.
l Allows you to avoid hard-coded solutions that will come back to haunt you in the future.
l Optimizes performance of your application through just-in-time data retrieval and caching.
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ARAsoft Java BAPI Object Factory for SAP R/3 II
l Tested for R/3 releases 4.0B through 4.6C.
l Tested with JDK 1.1 and Java 2; 100 percent pure Java.
l Works with any Java RFC middleware (HAHT, SAP, IBM).
l No proxies required.
l Supports desktop and server/web applications.
l Evaluation copy available on request.
l On-site developer training (all aspects of BAPI programming) available on request.
l An earlier version of this component was described in the article "Simplifying BAPI Programming with Components" in the Nov/Dec 1999 issue of the SAP Professional Journal (www.sappro.com)
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Additional Information
l CA925: Programming with BAPIs in Visual Basic
n Offered in Germany, UK, USA
l www.sap.com/bapi
l www.sappro.com
l www.sapinsider.com
l "The BABI Bible for SAP Programmers: The comprehensive guide to integrating SAP products with Web, desktop, and mobile applications using Java, Visual Basic, and ABAP" published in late 2000 by SAP Professional
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ARAsoft GmbH
l Products, Consulting, Custom-development, Trainingoffered world-wide.
http://www.arasoft.de
Alte Bruchsaler Str. 6069168 WieslochGermany
+49-6222-91171 (phone)+49-6222-91176 (fax)
+49-6227-748727 (SAP)
[email protected]@sap.com