Selecting data from a RDBMS table using connector framework, JDBC-Connector

Question

Hi Experts,
I'm trying to select data from a mysql database that is connected via the BI-JDBC System in the portal (EP 7 SP 11).
The connection (using the Connector Gateway Service) is set up, but selecting data fails.
Can you please give me a code example how to select data from a table using INativeQuery or IOperation / IExcecution ?? IQuery is depracted...
Here my piece of code, actually method "connection.newNativeQuery()" throws exception "BICapabilityNotSupportedException: Operation is not supported":
     IConnection connection = null;
     public void connectToJDBCSystem(String jdbcSystem) {
       // open a connection
       try { // get the Connector Gateway Service
          Object connectorservice =
          PortalRuntime.getRuntimeResources().getService(IConnectorGatewayService.KEY);
          IConnectorGatewayService cgService =
          (IConnectorGatewayService) connectorservice;
          if (cgService == null) {
               response.write("Error in get Connector Gateway Service <br>");
          try {
            ConnectionProperties prop =
               new ConnectionProperties(request.getLocale(), request.getUser());
            connection = cgService.getConnection(jdbcSystem, prop);     
          } catch (Exception e) {
               response.write("Connection to JDBC system " + jdbcSystem + " failed <br>");
               response.write((String)e.getMessage() + "<br>");
               e.printStackTrace();
          if (connection == null) {
               response.write("No connection to JDBC system " + jdbcSystem + "<br>");
          } else {
               response.write("Connection to JDBC system " + jdbcSystem + " successful <br>");
       } catch (Exception e) {
            response.write("Exception occurred <br>");
                       // up to this point it works fine...
       // build query using an IExecution object obtained from the Connection object
       response.write("prepare query 'SELECT idArt, art FROM art' <br>");
       String qstr = "SELECT idArt, art FROM art";
       INativeQuery query = null;
       try {
          query = connection.newNativeQuery();             
          response.write("execute query...<br>");
          ResultSet rs = (ResultSet)query.execute(qstr);
          while (rs.next()) {
               response.write("<th>" + rs.getString(1) + "</th>");     
       } catch(Exception e)
          response.write("connection.newNativeQuery() failed <br>");
          response.write((String)e.getMessage() + "<br>");
          e.printStackTrace();
       } finally {
             if( connection != null )
             try {connection.close();}
                          catch(Exception ee){}
Many thanks in advance, Monika
Edited by: Monika Verwohlt on Jan 26, 2010 9:49 AM

Answer 1

However this doesn't affect the XML encoding in data retrieved from XMLType using PL/SQL or programs (but it does work OK for SQLPlus SELECT).When performing an explicit serialization, with getClobVal method or XMLSerialize function, the database character set is used :
NLS_LANG = FRENCH_FRANCE.WE8MSWIN1252
NLS_CHARACTERSET = AL32UTF8
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> create table test_nls of xmltype;
Table créée.
SQL> insert into test_nls values(xmltype('<?xml version="1.0" encoding="UTF-8"?><root/>'));
1 ligne créée.
SQL> select * from test_nls;
SYS_NC_ROWINFO$
<?xml version="1.0" encoding="WINDOWS-1252"?>
<root/>
SQL> select t.object_value.getclobval() from test_nls t;
T.OBJECT_VALUE.GETCLOBVAL()
<?xml version="1.0" encoding="UTF-8"?><root/>
SQL> select xmlserialize(document object_value as clob) from test_nls;
XMLSERIALIZE(DOCUMENTOBJECT_VALUEASCLOB)
<?xml version="1.0" encoding="UTF-8"?><root/>