Struts and Oracle JDBC extension

Question

hi all,
When I try to use the Oracle JDBC extension to take advantage of the Oracle batch update feature, I got an
exception "org.apache.commons.dbcp.DelegatingPreparedStatement"
It happens when I try to cast a PrepareStatement to OraclePreparedStatement. (It works fine without the cast)
Any idea why?
Here is the code snippet:
ServletContext context = servlet.getServletContext();
DataSource ds = (DataSource) context.getAttribute(Action.DATA_SOURCE_KEY);
try {
Connection conn = ds.getConnection();
String sql = "SELECT username FROM users";
OraclePreparedStatement ps = (OraclePreparedStatement) conn.prepareStatement(sql);
ResultSet rset = ps.executeQuery();
} catch ( Exception e ) {
System.out.println( e.getMessage() );
struts_config.xml:
<data-sources>
<data-source>
<!-- set-property property="driverClass" value="oracle.jdbc.driver.OracleDriver"/ -->
<set-property property="driverClass" value="oracle.jdbc.OracleDriver"/>
<set-property property="url" value="jdbc:oracle:thin:@hostname:1522:db"/>
<set-property property="maxCount" value="5"/>
<set-property property="minCount" value="1"/>
<set-property property="user" value="xxx"/>
<set-property property="password" value="xxx"/>
</data-source>
</data-sources>
Thanks for any help!

Answer 1

Hi scsi-boy:
I have no trouble reading a Timestamp from Oracle...it's trying to write or update one (and unfortunately, I have to do as I said to get it done).
you shouldn't have to import the oracle sql package
That's precisely the point -- I am not trying to use any Oracle specific stuff.. It wouldn't be all that difficult for them to do the casting inside of the driver, instead they just add the following comments to their example:
       // Writing data to Lobs:
        // There are no methods to do this with java.sql.Clob/Blob. 
        // For oracle.sql.CLOB there is getAsciiOutputStream() to write via
        // an ascii stream and getCharacterOutputStream() to write via a
         // unicode one, plus putChars() to write a char array and putString()
         // to write a String - both at a given position within the Clob.  For
         // oracle.sql.BLOB there is getBinaryOutputStream() and putBytes(). 
        // There are also oracle.jdbc.driver classes to do similar that
        // take oracle.sql.CLOB/BLOB as appropriate, namely:
        //       OracleBlobOutputStream()
        //       OracleClobOutputStream()
        //       OracleClobWriter()
        // (Note all three classes have corresponding input/reader classes.)
        // Hence to write data to the lobs here it is necessary to cast the
         // Clob and Blob to oracle.sql.CLOB and oracle.sql.BLOB respectively
         // and use one of the methods listed above.  E.g. to append to the
        // clob column:
        ((oracle.sql.CLOB)c_lob).putString( (int)c_lob.length()+1, "\nBye!" );The example can be found at the link shown below (you may have to do a free sign-up to view it):
http://www.experts-exchange.com/Databases/Oracle/Q_20358143.html
;o)
V.V.