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  1. JDK
  2. JDK-6480146

ResultSet#next() is different from ResultSet#first()

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      Description

      FULL PRODUCT VERSION :
      C:\Programme\Java\jdk1.6.0\bin>java -version
      java version "1.6.0-beta2"
      Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
      Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Windows XP SP-2

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      Using Microsoft Access database

      A DESCRIPTION OF THE PROBLEM :
      On newly created ResultSet method first() shold have the same effect as method next() even for a ResultSet with 0 rows.


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      See source code

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Internal rowPosition should be set to 1
      ACTUAL -
      Internal rowPosition is set to 0, 1, 2, ...

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      /*
       * JdbcOdbcResultSetTest.java
       * JUnit based test
       *
       * Created on 11. Juni 2006, 02:33
       *
       * $Id: JdbcOdbcResultSetTest.java 83 2006-08-24 20:56:16Z jdk6_JdbcOdbcBugs_ulf $
       */

      package sun.jdbc.odbc;

      import junit.framework.*;
      import java.sql.*;

      /**
       *
       * @author Ulf Zibis, ###@###.###
       */
      public class JdbcOdbcResultSetTest extends TestCase {
        
        private static final String URL = "jdbc:odbc:TestData";
        private static final String TABLE = "Test1";
        private static final String ID = "id";
        private static final String STRING1 = "string1";
        private static final String INT1 = "int1";
        private static final int STRING1_LEN = 100;
        private static final String EMPTY_QUERY = "SELECT * FROM "+TABLE+" WHERE "+ID+"=0";
        private static final String ORDERED_QUERY = "SELECT * FROM "+TABLE+" ORDER BY "+ID;
        private static final String STRING32CHARS = "Here are only 16 + 16 more chars";
        private static final String UPDATED19CHARS = "updated to 19 chars";
        private static final String INSERTED8CHARS = "inserted";
        
        private Connection myCon = null;
        private Statement myStmt;
        private JdbcOdbcResultSet myRs;
        
        static {
          System.out.println("JDK Version: "+System.getProperty("java.version"));
          try {
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); // Obsolete in JDK 6.0
          }
          catch (Exception e) { e.printStackTrace(); }
        }
        
        public JdbcOdbcResultSetTest(String testName) {
          super(testName);
          System.out.println("Construct JdbcOdbcResultSetTest("+testName+") !!");
        }
        protected void finalize() throws Throwable {
          super.finalize();
          try { if (myCon != null) myCon.close(); }
          catch (Throwable t) { t.printStackTrace(); }
        }
        
        protected void setUp() throws Exception {

          myCon = DriverManager.getConnection( URL);
          Statement stmt = myCon.createStatement();
          try {
            ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM "+TABLE);
            rs.next();
            //System.out.println( TABLE+" had "+rs.getInt( 1)+" record(s).");
            stmt.executeUpdate("DROP TABLE "+TABLE);
          }
          catch (SQLException se) {
            if (se.getErrorCode() == -1305)
              System.out.println( TABLE+" was not existent.");
            else throw se;
          }
          stmt.executeUpdate("CREATE TABLE "+TABLE+"( "+ID+" COUNTER PRIMARY KEY, "
                                                      +STRING1+" VARCHAR("+STRING1_LEN+"), "
                                                      +INT1+" INT)");
          //System.out.println("New empty table "+TABLE+" created !");
          stmt.close();
          myStmt = myCon.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        }
        protected void tearDown() throws Exception {
          try { if (myCon != null) myCon.close(); myCon = null;}
          catch (Throwable t) { t.printStackTrace(); }
        }
        
        public void testNextAgainstFirst() throws Exception {
          System.out.println("testNextAgainstFirst() <Bug ???>");
          try {
            myRs = (JdbcOdbcResultSet)myStmt.executeQuery( ORDERED_QUERY);
            boolean result;
            
            myRs.beforeFirst(); // define same start position
            result = myRs.next(); // OK: internal rowPosition is set to 1
            assertFalse("myRs.next(): ", result);
      // assertTrue("myRs.isAfterLast(): ", myRs.isAfterLast());
            result = myRs.next(); // Bug: internal rowPosition is set to 2
            assertFalse("myRs.next(): ", result);
      // assertTrue("myRs.isAfterLast(): ", myRs.isAfterLast());
            
            result = myRs.first(); // Bug: internal rowPosition remains on 2
            assertFalse("myRs.first(): ", result);
      // assertTrue("myRs.isAfterLast(): ", myRs.isAfterLast());
            myRs.beforeFirst(); // define same start position
            result = myRs.first(); // Bug: internal rowPosition remains on 0
            assertFalse("myRs.first(): ", result);
      // assertTrue("myRs.isAfterLast(): ", myRs.isAfterLast());

          } catch (SQLException se) {
            Exception e = new Exception( se+", Error: "+se.getErrorCode()+", SQLState: "+se.getSQLState());
            e.setStackTrace( se.getStackTrace());
            //e.initCause( se);
            throw e;
          }
        }


        
      /*
        public static Test suite() {
          TestSuite suite = new TestSuite(JdbcOdbcResultSetTest.class);
          
          return suite;
        }
        
        public static void main (String[] args) {
                junit.textui.TestRunner.run(suite());
        }
      */
      }

      ---------- END SOURCE ----------

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            Assignee:
            lancea Lance Andersen
            Reporter:
            ndcosta Nelson Dcosta (Inactive)
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