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From "V.Narayanan (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DERBY-1917) Clob.position fails with Embedded driver and large Clobs
Date Thu, 28 Dec 2006 05:03:30 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1917?page=all ]

V.Narayanan reassigned DERBY-1917:
----------------------------------

    Assignee: V.Narayanan

> Clob.position fails with Embedded driver and large Clobs
> --------------------------------------------------------
>
>                 Key: DERBY-1917
>                 URL: http://issues.apache.org/jira/browse/DERBY-1917
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>            Reporter: Fernanda Pizzorno
>         Assigned To: V.Narayanan
>            Priority: Minor
>
> The method Clob.position(String searchstr, long start) fails when used on large lobs
if the searchstr is bigger than 256 characters. I have seen two different errors, if the search
string it bigger than 256 character it is not found and if the search string is bigger than
512 characters an exception is thrown.
> /* Repro */
>             // Connect
>             Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
>             Connection conn = DriverManager.getConnection("jdbc:derby:ReproClob;create=true",
"app", "app");
>             
>             // Create table and populate
>             Statement stmt = conn.createStatement();
>             try {
>                 stmt.executeUpdate("DROP TABLE tmpClob");
>             } catch (SQLException se) {}
>             stmt.executeUpdate("CREATE TABLE tmpClob (a int, b clob(40K))");
>             
>             PreparedStatement ps = conn.prepareStatement("INSERT INTO tmpClob VALUES
(?, ?)");
>             String tmp = "abcdefghijklmnopqrstuvxyz";
>             StringBuilder sb = new StringBuilder();
>             for (int i=0; i<1500; i++) {
>                 sb.append(tmp);
>             }
>             ps.setInt(1, 1);
>             ps.setString(2, sb.toString());
>             ps.executeUpdate();
>             ps.close();
>             ResultSet rs = stmt.executeQuery("SELECT * FROM tmpClob");
>             if (rs.next()) {
>                 Clob c = rs.getClob(2);
>                 // Bug #1
>                 String subString1 = c.getSubString(100, 513);
>                 try {
>                     long i1 = c.position(subString1, 90);
>                     System.out.println("Found searched string at: " + i1);
>                 } catch (SQLException se) {
>                     System.out.println("FAILURE REPRODUCED: Clob.position(string, int)
throws an exception when the length of the search string is bigger than 512");
>                     se.printStackTrace();
>                     while (se != null) {
>                         System.out.println("FAIL: " + se.getMessage());
>                         se = se.getNextException();
>                     }
>                 }
>                 // Bug #2
>                 String subString2 = c.getSubString(100, 257);
>                 long i2 = c.position(subString2, 90);
>                 if (i2 == -1) {
>                     System.out.println("FAILURE REPRODUCED: Clob.position(string, int)
does not find the search string if its length is bigger than 256");
>                 } else {
>                     System.out.println("Found searched string at: " + i2);
>                 }
>             }
>             rs.close();
>             stmt.close();
>             conn.rollback();
>             conn.close();

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