Representing SAP R / 3 data in Oracle Database using the SAP Java Connector

Once again , it became necessary to connect the two known systems with each other, now it will be the Oracle Database and SAP. Perhaps there are paid methods of binding, but in this case we are talking about the need to use small portions of data.

I’ll tell you how you can display data taken from SAP using a select statement. The example will be very simple, to demonstrate the fundamental possibility. It was created based on SAP JCo or publicly available source code.

Immediately, I note that SAP JCo is issued only to those who pay. And Oracle Database does not welcome calls to java using binary libraries, therefore, by default this feature should be specifically enabled.

Required types for a table and its rows in Oracle Database, sap_table.tps:
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drop type sap_rows; / drop type sap_row; / create or replace type sap_row as object(p1 varchar(30), p2 varchar(30), p3 varchar(30), p4 varchar(30), p5 varchar(30), dt varchar(20)) / create or replace type sap_rows as table of sap_row / 

The main component in which the process of receiving data from SAP and preparing for use in select, art0int_sap.java:

 package com.art0int; import java.util.*; import java.io.*; import java.math.*; import java.util.Calendar; import java.text.SimpleDateFormat; import java.sql.*; import oracle.sql.*; import oracle.jdbc.driver.OracleDriver; import java.util.HashMap; import java.util.Properties; import com.sap.conn.jco.AbapException; import com.sap.conn.jco.JCoContext; import com.sap.conn.jco.JCoDestination; import com.sap.conn.jco.JCoDestinationManager; import com.sap.conn.jco.JCoException; import com.sap.conn.jco.JCoField; import com.sap.conn.jco.JCoFunction; import com.sap.conn.jco.JCoFunctionTemplate; import com.sap.conn.jco.JCoStructure; import com.sap.conn.jco.JCoTable; import com.sap.conn.jco.ext.DataProviderException; import com.sap.conn.jco.ext.DestinationDataEventListener; import com.sap.conn.jco.ext.DestinationDataProvider; public class SAP_TABLE { //    static Vector vrows; //    ,     SAP static MyDestinationDataProvider myProvider = null; //,       SAP     select public static oracle.sql.ARRAY SQL_sap_rows (BigDecimal nrows) throws SQLException { Connection conn = new OracleDriver().defaultConnection(); //        ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("SAP_ROWS", conn ); StructDescriptor outDesc = StructDescriptor.createDescriptor("SAP_ROW", conn); int nrowsval = nrows.intValue(); vrows = new Vector(nrowsval); Object[] out_attr = new Object[6]; try { if (myProvider == null) { myProvider = new MyDestinationDataProvider(); try { com.sap.conn.jco.ext.Environment.registerDestinationDataProvider(myProvider); } catch(IllegalStateException providerAlreadyRegisteredException) { throw new Error(providerAlreadyRegisteredException); } } //   SAP String destName = "ABAP_AS"; myProvider.changeProperties(destName, getDestinationPropertiesFromUI()); JCoDestination dest; try { //   dest = JCoDestinationManager.getDestination(destName); //   dest.ping(); System.out.println("Destination " + destName + " works"); JCoFunction function = dest.getRepository().getFunction("MY_SAPFUNCTION"); try { //  function.execute(dest); } catch(AbapException e) { System.out.println(e.toString()); return null; } //  JCoTable out = function.getTableParameterList().getTable(0); for (int i = 0; i < out.getNumRows(); i++) { out.setRow(i); out_attr[1-1] = out.getString(1-1); out_attr[2-1] = out.getString(2-1); out_attr[3-1] = out.getString(3-1); out_attr[4-1] = out.getString(4-1); out_attr[5-1] = out.getString(5-1); out_attr[6-1] = (Object)new String(now()); vrows.add((Object)new STRUCT(outDesc, conn, out_attr)); nrowsval--; if (nrowsval==0) break; } } catch(JCoException e) { e.printStackTrace(); System.out.println("Execution on destination " + destName+ " failed"); } } catch(Exception e) { e.printStackTrace(); } //       Oracle oracle.sql.ARRAY outArray = new oracle.sql.ARRAY(descriptor,conn,vrows.toArray()); return outArray; } //      SAP static Properties getDestinationPropertiesFromUI() { Properties connectProperties = new Properties(); connectProperties.setProperty(DestinationDataProvider.JCO_R3NAME, "MY_R3NAME"); connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "MY_IP"); connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "MY_CLIENTNO"); connectProperties.setProperty(DestinationDataProvider.JCO_USER, "MY_SAPUSER"); connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "MY_SAPPASSWORD"); connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "MY_SYSNR"); connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "en"); return connectProperties; } //     SAP static class MyDestinationDataProvider implements DestinationDataProvider { private DestinationDataEventListener eL; private HashMap<String, Properties> secureDBStorage = new HashMap<String, Properties>(); public Properties getDestinationProperties(String destinationName) { try { Properties p = secureDBStorage.get(destinationName); if(p!=null) { if(p.isEmpty()) throw new DataProviderException(DataProviderException.Reason.INVALID_CONFIGURATION, "destination configuration is incorrect", null); return p; } return null; } catch(RuntimeException re) { throw new DataProviderException(DataProviderException.Reason.INTERNAL_ERROR, re); } } public void setDestinationDataEventListener(DestinationDataEventListener eventListener) { this.eL = eventListener; } public boolean supportsEvents() { return true; } void changeProperties(String destName, Properties properties) { synchronized(secureDBStorage) { if(properties==null) { if(secureDBStorage.remove(destName)!=null) eL.deleted(destName); } else { secureDBStorage.put(destName, properties); eL.updated(destName); } } } } // ,     public static final String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm:ss"; public static String now() { Calendar cal = Calendar.getInstance(); SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW); return sdf.format(cal.getTime()); } } 

Wrapper for loading java source in Oracle Database, sap_table.js:

 create or replace and compile java source named sap_table as @art0int_sap.java / 

Wrappers for java calls from Oracle Database, SAP_TABLE.spc:

 create or replace package SAP_TABLE is function get_java_property(prop in varchar2) return varchar2 is language java name 'java.lang.System.getProperty(java.lang.String) return java.lang.String'; function sap_rows_table(nrows in number) return sap_rows IS LANGUAGE JAVA name 'com.art0int.SAP_TABLE.SQL_sap_rows(java.math.BigDecimal) return oracle.sql.ARRAY'; end SAP_TABLE; / 

And the final script that will put everything together. Note the issuance of permissions to call the sapjco3 library.

 export ORACLE_SID=MYDB sqlplus '/ as sysdba' <<EOF drop user sapacc cascade; / create user sapacc identified by "psapacc" default tablespace users temporary tablespace temp profile monitor; grant connect,resource to sapacc; exec dbms_java.grant_permission('SAPACC', 'SYS:java.net.SocketPermission', 'MY_IP:MY_PORT', 'connect,resolve' ); exec dbms_java.grant_permission('SAPACC', 'SYS:java.io.FilePermission', '.', 'read' ); --  :    Oracle Database,            ,    ,    --select seq, kind, grantee, name, enabled from dba_java_policy where name like '%java.lang.RuntimePermission%'; --98 RESTRICT PUBLIC 0:java.lang.RuntimePermission#loadLibrary.* ENABLED exec dbms_java.disable_permission(98); exec dbms_java.grant_permission('SAPACC', 'SYS:java.lang.RuntimePermission', 'loadLibrary.sapjco3', '' ); exec dbms_java.enable_permission(98); EOF #     dropjava -user sapacc/psapacc -verbose sapjco3.jar loadjava -user sapacc/psapacc -order -resolve -verbose -resolver "((* sapacc) (* PUBLIC) (* -))" sapjco3.jar sqlplus -S /nolog <<EOF connect sapacc/psapacc set pagesize 1000 set linesize 160 @sap_table.tps show errors @sap_table.js show errors @SAP_TABLE.spc show errors EOF export NLS_LANG=American_America.UTF8 sqlplus -S /nolog<<EOF connect sapacc/psapacc set serveroutput on call dbms_java.set_output(1000000); set linesize 160 set pagesize 1000 set feedback off col p1 for a5 col p2 for a3 col p3 for a3 col p4 for a5 col p5 for a25 col dt for a25 select sapacc.SAP_TABLE.get_java_property('java.library.path') as java_library_path ,sapacc.SAP_TABLE.get_java_property('java.version') as java_version from dual; select * from table(sapacc.SAP_TABLE.sap_rows_table(15)) order by dt; exit; EOF 

You will see the result if you put the SAP Java Connector library to the corresponding java.library.path directory that appears when you first call the script.