Problem with statement.cancel()

Question

Hi,
I am using Oracle 10g with the 10.2.0.3 jdbc (OCI) drivers. Though my statement.quertTimeout() works fine, the statement.cancel() does not seem to do anything.
Could you please guide me as to the cause of this kind of action, since I have read that internally queryTimeout() depends on cancel() to stop qurery execution.
Thanks in advance

Answer 1

Hi,
I am using Oracle 10g with the 10.2.0.3 jdbc (OCI)
drivers. Though my statement.quertTimeout() works
fine, the statement.cancel() does not seem to do
anything.
Could you please guide me as to the cause of this
kind of action, since I have read that internally
queryTimeout() depends on cancel() to stop qurery
execution.
Thanks in advanceThe code I am using is:
package test;
import java.sql.*;
import oracle.jdbc.pool.OracleDataSource;
import oracle.jdbc.driver.*;
public class OracleQueryTimeout
     public static void main(String[] args)
          long timetaken; // Holds the execution time
          int numFetchedRows = 0;
          // Create a OracleDataSource instance
          OracleDataSource ods;
          try {
               ods = new OracleDataSource();
               //Sets the driver type
               ods.setDriverType("oci");
               // Sets the database server name
               ods.setServerName("<my machine name>");
               // Sets the database name
               ods.setDatabaseName("orcl");
          // Sets the port number
               ods.setPortNumber(1521);
               // Sets the user name
               ods.setUser("<username>");
               // Sets the password
               ods.setPassword("<password>");
               // Create a connection object
               Connection connection;
                    connection = ods.getConnection();
     // Sets the auto-commit property for the connection to be false.
                    connection.setAutoCommit(false);
                    Statement stmt = null;
               String query = "Select * from USER_CATEGORY,MV_SUBSCRIBER_ATTRIBS";
               stmt=connection.createStatement();
               stmt.setQueryTimeout(0);
               // Get time at start of query
               long initialTime = System.currentTimeMillis();
               // Execute the Query in query
               ResultSet rst = stmt.executeQuery(query);
               long finalTime = System.currentTimeMillis();
               timetaken = finalTime - initialTime;
               if(timetaken>0003)
                    stmt.cancel();
                    System.out.println("Statement Cancelled");
               //Populate the ResultSet object
               while ( rst.next() )
                    numFetchedRows++;
                    rst.getObject(1);
               System.out.println("Time taken for query: " + timetaken);
               System.out.println("Number of rows fetched: " + numFetchedRows);
               System.out.println(rst);
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
The program hangs when it comes to retrieving the >resultset
The program gives the following output If I do not go through the resultset:
Statement Cancelled
Time taken for query: 50782
Number of rows fetched: 0
oracle.jdbc.driver.OracleResultSetImpl@1a85d38Here the cancel method was invoked but to no visible action.