Example: ResultSet sensitivity

Some of the formatting in this example may be incorrect in order to fit this example on a printed page.

import java.sql.*;

public class Sensitive2 {

    public Connection connection = null;

    public static void main(java.lang.String[] args) {
        Sensitive2 test = new Sensitive2();

        test.setup();
        test.run("sensitive");
        test.cleanup();

        test.setup();
        test.run("insensitive");
        test.cleanup();
    }


    public void setup() {

        try {
            System.out.println("Native JDBC used");
            Class.forName("com.ibm.db2.jdbc.app.DB2Driver");
            connection = DriverManager.getConnection("jdbc:db2:*local");

            Statement s = connection.createStatement();
            try {
                s.executeUpdate("drop table cujosql.sensitive");
            } catch (SQLException e) {
                // Ignored.
            }

            s.executeUpdate("create table cujosql.sensitive(col1 int)");
            s.executeUpdate("insert into cujosql.sensitive values(1)");
            s.executeUpdate("insert into cujosql.sensitive values(2)");
            s.executeUpdate("insert into cujosql.sensitive values(3)");
            s.executeUpdate("insert into cujosql.sensitive values(4)");
            s.executeUpdate("insert into cujosql.sensitive values(5)");


            try {
                s.executeUpdate("drop table cujosql.sensitive2");
            } catch (SQLException e) {
                // Ignored.
            }

            s.executeUpdate("create table cujosql.sensitive2(col2 int)");
            s.executeUpdate("insert into cujosql.sensitive2 values(1)");
            s.executeUpdate("insert into cujosql.sensitive2 values(2)");
            s.executeUpdate("insert into cujosql.sensitive2 values(3)");
            s.executeUpdate("insert into cujosql.sensitive2 values(4)");
            s.executeUpdate("insert into cujosql.sensitive2 values(5)");

            s.close();

        } catch (Exception e) {
            System.out.println("Caught exception: " + e.getMessage());
            if (e instanceof SQLException) {
                SQLException another = ((SQLException) e).getNextException();
                System.out.println("Another:  " + another.getMessage());
            }
        }
    }


    public void run(String sensitivity) {
        try {

            Statement s = null;
            if (sensitivity.equalsIgnoreCase("insensitive")) {
                System.out.println("creating a TYPE_SCROLL_INSENSITIVE cursor");
                s = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, 
                    ResultSet.CONCUR_READ_ONLY);
            } else {
                System.out.println("creating a TYPE_SCROLL_SENSITIVE cursor");
                s = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, 
                    ResultSet.CONCUR_READ_ONLY);
            }

            ResultSet rs = s.executeQuery("select col1, col2 From cujosql.sensitive,
                                           cujosql.sensitive2 where col1 = col2");

            rs.next();
            System.out.println("value is " + rs.getInt(1));
            rs.next();
            System.out.println("value is " + rs.getInt(1));
            rs.next();
            System.out.println("value is " + rs.getInt(1));
            rs.next();
            System.out.println("value is " + rs.getInt(1));

            System.out.println("fetched the four rows...");

            // Another statement creates a value that does not fit the where clause.
            Statement s2 =
              connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
              ResultSet.CONCUR_UPDATEABLE);
            ResultSet rs2 = s2.executeQuery("select *
            from cujosql.sensitive where col1 = 5 FOR UPDATE");
            rs2.next();
            rs2.updateInt(1, -1);
            rs2.updateRow();
            s2.close();

            if (rs.next()) {
                System.out.println("There is still a row: " + rs.getInt(1));
            } else {
                System.out.println("No more rows.");
            }

        } catch (SQLException e) {
            System.out.println("SQLException exception: ");
            System.out.println("Message:....." + e.getMessage());
            System.out.println("SQLState:...." + e.getSQLState());
            System.out.println("Vendor Code:." + e.getErrorCode());
            System.out.println("----------------------------");
            e.printStackTrace();
        }
        catch (Exception ex) {
            System.out.println("An exception other
            than an SQLException was thrown: ");
            ex.printStackTrace();
        }
    }



    public void cleanup() {
        try {
            connection.close();
        } catch (Exception e) {
            System.out.println("Caught exception: ");
            e.printStackTrace();
        }
    }
}