Databases
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    <p>This could be caused by a number of reasons, including the driver you are using.</p> <p>a) Some drivers do not allow nested statements. Depending if your driver supports JDBC 3.0 you should check the third parameter when creating the Statement object. For instance, I had the same problem with the JayBird driver to Firebird, but the code worked fine with the postgres driver. Then I added the third parameter to the createStatement method call and set it to ResultSet.HOLD_CURSORS_OVER_COMMIT, and the code started working fine for Firebird too. </p> <pre><code>static void testNestedRS() throws SQLException { Connection con =null; try { // GET A CONNECTION con = ConexionDesdeArchivo.obtenerConexion("examen-dest"); String sql1 = "select * from reportes_clasificacion"; Statement st1 = con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT); ResultSet rs1 = null; try { // EXECUTE THE FIRST QRY rs1 = st1.executeQuery(sql1); while (rs1.next()) { // THIS LINE WILL BE PRINTED JUST ONCE ON // SOME DRIVERS UNLESS YOU CREATE THE STATEMENT // WITH 3 PARAMETERS USING // ResultSet.HOLD_CURSORS_OVER_COMMIT System.out.println("ST1 Row #: " + rs1.getRow()); String sql2 = "select * from reportes"; Statement st2 = con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); // EXECUTE THE SECOND QRY. THIS CLOSES THE FIRST // ResultSet ON SOME DRIVERS WITHOUT USING // ResultSet.HOLD_CURSORS_OVER_COMMIT st2.executeQuery(sql2); st2.close(); } } catch (SQLException e) { e.printStackTrace(); } finally { rs1.close(); st1.close(); } } catch (SQLException e) { } finally { con.close(); } } </code></pre> <p>b) There could be a bug in your code. Remember that you cannot reuse the Statement object, once you re-execute a query on the same statement object, all the opened resultsets associated with the statement are closed. Make sure you are not closing the statement.</p>
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    1. POHow can I avoid ResultSet is closed exception in Java?
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    1. COI was having same issue with Firebird JDBC drivers. I can verify that the `ResultSet.HOLD_CURSORS_OVER_COMMIT` is working.
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      1. USIndrek Kõue
 

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