Bapi jco

Compiled by Y R Nagesh 1
BAPI
Business Application Programming Interface

What is BAPI
A Business Application Programming Interface is a
precisely defined interface providing access process
and data in Business Applications Systems Such as
SAP R/3

Benefits of BAPI
Can be used in diverse languages / Development Environments
(ABAP, Visual Basic, Java, C++, etc.)
Can be called from diverse platforms (COM, CORBA, Unix)
Reduced development cost
Reduced maintenance cost
“Best-of-both-worlds” approach
Rich functionality of the R/3 system
User-specific front-ends

Where BAPIs can be used

Return Code Information
Usually a structure, sometimes a table
Data dictionary structures used
BAPIRETURN
BAPIRETURN1
BAPIRET1
BAPIRET2

BAPI Return Structure
Type Message type
blank or "S"=Success
"E"=Error
"W"=Warning
"I"=Information
"A"=Abort
Message Message text
Log_No Application Log Number
Log_Msg_No Application Log Message Serial Number
Message_V1 - V4 Message variables

SAP transactions
BAPI Business Object Browser (BAPIs only)
SWO1 Business Object Builder (all objects)
SWO2 Business Object Browser (all objects)
SE11 Data Dictionary
SE37 Function Builder

JCO Overview
High-performance JNI-based middleware
Support R/3 3.1H and higher.
Supports inbound and outbound calls.
Supports client pooling.
Supports desktop and web/application server applications.
Multi-platform
Complete and correct code page handling
Easy to install and deploy

Installation and Deployment
Required files in WINNTsystem32:
librfc32.dll (at least 46D, build 263)
jRFC11.dll (JDK 1.1)
jRFC12.dll (JDK 1.2 and 1.3)
Required files in Java class path:
jCO.jar

BAPI step by step procedure
STEP 1 - Define Structure For The BAPI
STEP 2 - Write Function Module
STEP 3 - Create the API Method Using The BAPI WIZARD
STEP 4 – Final Steps

About the Example
About the Example:
Front End : Java Servlets (Web Application)
Web Server : Apache Tomcat
The Servlet takes Vendor number and passes it to the BAPI which
in turn fetches the Vendor information from the LFA1 table and
returns it in BAPIRET2 format to the servlet, the servlet fetches the
data from return structure and displays it.

Step 1 : Define a Structure for BAPI
In this step structures for the parameters and tables of the
function module used for the BAPI are defined.
USE TCODE : SE11 then Data type -> Structure
Define the structure Name : Ex: ZVEND
Important note: You will have to define a structure for
every parameter in the BAPI. You cannot use the same
structures used in existing applications because BAPI
structures are frozen when BAPIs are released and then
there are restrictions on changing them.

Creating a Structure
Enter the
Structure
name
Click on Create
Button

Select
Structure
Click on
Check Button

Activate the
Structure

Step 2 : Write Function Module
Each BAPI must have its own function group.
Under the attributes tab remember to select Processing Type Remote
Enabled module, otherwise the function module cannot be invoked via
RFC and used as a BAPI
Import/Export parameters can only be BY VALUE for an RFC enabled
function module

Creating Function group

Creating Function module
Click on
Create
Click on Save

Make the function
Remote Enabled

Import Parameters
Check
“ Pass Value”

Tables

Source Code

Activate Function Module
Activate

Releasing Function module
Release the Function Module

Step 2 : Create the API Method Using
The BAPI WIZARD
BAPI wizard is used to expose the remote function module as a BAPI
Wizard will generate some additional code, so the function module is a valid
method of the BOR. This allows the BAPI to be called as a workflow method
in addition to be called by an outside program.
Each function module corresponds to a method in the BOR
Go to the Business Object Builder SWO1.
You can either create the new Object type as a subtype of an existing business
object or create a new business object from scratch..

Create new BAPI Object
USE TCODE
SWO1
Supertype not
required as we are
creating a new Object
* for Cross
Apps

Create new BAPI Object
Note that when you create the business object a standard
interface, an attribute ObjectType and the methods
ExistenceCheck and Display are automatically generated.
These cannot be changed !

Adding API method

Adding API method
Click
here

Adding API method

Adding API method
Click Yes
API method
added

Implementing BAPI Object
Select the BAPI object

Implementing BAPI Object
Change release status To implemented

Releasing BAPI Object
Change release status To released

Implementing API Method
Select the API Method

Implementing API Method
Change release status To implemented

Releasing API Method
Change release status To released

Generating API Method
Click on Generate
Button

Configuring Apache Tomcat
Directory Structure
Jakarta-tomcat-4.1.31
Webapps
<User Folder> (Vendor)
WEB-INF
classes
lib
Web.xml
Index.html

classes
This folder contains all the class files created for successful execution
of the servlet.
lib
This folder contains all the library files required i.e
sapjco.jar
servlet.jar
Note: While compiling the java code make sure that the Classpath is set to the above to .jar files

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee“
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd“ version="2.4">
<servlet>
<servlet-name>Some internal name</servlet-name>
<servlet-class>display_vend</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Some internal name</servlet-name>
<url-pattern>/NameSeenByUser.do</url-pattern>
</servlet-mapping>
</web-app>
Servlet name
Web.xml

Servlet Program
import statements required
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import com.sap.mw.jco.*;

Servlet Program
public class display_vend extends HttpServlet
{
PrintWriter pw;
public void doPost(HttpServletRequest req, HttpServletResponse res)
{ int num = Integer.parseInt(req.getParameter("rand"));
String no,name,city,district,po,tele,fax;
String SID = "R"+num;
String vendno = req.getParameter("vendno");
IRepository repository; // The repository we will be using
try {
// Add a connection pool to the specified system
JCO.addClientPool(SID, 100, "800", "hari", "sapnjoy", "EN", "sapides", "00” );
// Alias for this pool , Max. number of connections , SAP client , userid
// password , language , host name
Unique name for
connection pool each
time connection is
established random
number is generated in
the index.html i.e
starting page and
value is passed to
servlet

Servlet Program
repository = JCO.createRepository("MYRepository", SID); // Create a new repository
// Get a function template from the repository
IFunctionTemplate ftemplate = repository.getFunctionTemplate("ZVENDFUN");
// Create a function from the template
JCO.Function function = new JCO.Function(ftemplate);
JCO.Client client = JCO.getClient(SID); // Get a client from the pool
JCO.ParameterList input = function.getImportParameterList(); // Fill in input parameters
input.setValue(vendno, "LIFNR" );
client.execute(function); // Call the remote system
JCO.Structure ret = function.getExportParameterList().getStructure("RETURN");
pw = res.getWriter();
pw.println("<html><body bgcolor=#eeeff8><center><hr><h1>Customer Details</h1><hr>");
// Get table containing the data
JCO.Table vend = function.getTableParameterList().getTable("ITAB");

Servlet Program
for (int i = 0; i < vend.getNumRows(); i++)
{
vend.setRow(i);
no = vend.getString("LIFNR");
name = vend.getString("NAME1");
city = vend.getString("ORT01") ;
district = vend.getString("ORT02") ;
po = vend.getString("PFACH") ;
tele = vend.getString("TELF1") ;
fax = vend.getString("TELFX") ;
// Fetching data from SAP database and storing in local variables

Servlet Program
pw.println("<table border=1><tr><td><B>Vendor Number</B></td><td>"+no+ "</td></tr><tr><td>" +
"<B>Customer Name</B></td><td>"+name+ "</td></tr><tr><td>" +
"<B>Customer Address</B></td><td></tr>"+
"<tr><td> </td><td><B>City</B></td><td>"+city+"</td></tr>" +
"<tr><td> </td><td><B>District</B></td><td>"+district+"</td></tr>"+
"<tr><td> </td><td><B>PO Box</B></td><td>"+po+"</td></tr>"+
"<tr><td><B>Telephone</B></td><td>"+tele+"</td></tr>"+
"<tr><td><B>TeleFax</B></td><td>"+fax+"</td></tr></table>" );
pw.println("<form name=form1 action='index.html' method=get><input type=submit
value='Back'></form></center></body></html>"); } }
catch (Exception E)
{
System.out.println(E);
}
} }

Index.html
<html>
<head><script language="JavaScript">
function randomnumber() {
var r=Math.floor(Math.random()*1111)
if (r!=0) document.form1.rand.value=r; }
</script>
</head>
<body bgcolor=#eeeff8 onLoad="javascript:randomnumber();">
<center><hr><h1>Enter the Vendor Number</h1><hr>
</center><form name=form1 action="NameSeenByUser.do" method=post>
<center><input type=text name=vendno>
<input type=submit value="Submit">
<input type=hidden name="rand"></center>
</form></body></html>

Output

Bapi jco

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Bapi jco