Question

I can’t seem to get the right magic combination to make this work:

OracleDataSource ods = new oracle.jdbc.pool.OracleDataSource();
ods.setURL("jdbc:oracle:thin:app_user/pass@server:1521:sid");
DefaultContext conn = ods.getConnection();
CallableStatement st = conn.prepareCall("INSERT INTO tableA (some_id) VALUES (1) RETURNING ROWID INTO :rowid0");
st.registerReturnParameter(1, OracleTypes.ROWID);
st.execute();

The error I get is “Protocol Violation”. If I change to registerOutParameter(), I get notified that I haven’t registered all return variables. If I wrap the statement in a PL/SQL begin; end; block then I get the parameter just fine using a regular registerOutParameter() call. I would really prefer to avoid wrapping all my inserts statements in PL/SQL – so what is missing from above?

Answer 1

A few things you’ll need to do

• Change CallableStatement to OracleCallableStatement
• Try and return into a NUMBER, ie: OracleTypes.Number

Sample code for returning info from a query:

OraclePreparedStatement pstmt = (OraclePreparedStatement)conn.prepareStatement(
       "delete from tab1 where age < ? returning name into ?");
pstmt.setInt(1,18);

/** register returned parameter
  * in this case the maximum size of name is 100 chars
  */
pstmt.registerReturnParameter(2, OracleTypes.VARCHAR, 100);

// process the DML returning statement
count = pstmt.executeUpdate();
if (count>0)
{
  ResultSet rset = pstmt.getReturnResultSet(); //rest is not null and not empty
  while(rset.next())
  {
    String name = rset.getString(1);
    ...
  }
}

More info on Oracle’s JDBC extensions:

• http://download-uk.oracle.com/docs/cd/B19306_01/java.102/b14355/oraint.htm