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http://issues.apache.org/jira/browse/DERBY-1917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12461757
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Bryan Pendleton commented on DERBY-1917:
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Thanks for investigating the 256 value. It is good to know that it is
just an arbitrary constant. I suppose that at some point we could
replace it with a static final int, but that doesn't seem important for this
fix.
Regarding the testing, I agree that re-enabling the existing tests should
be adequate.
So in my opinion the only blocking issue is to resolve the tab/space issue,
so that the modified code matches the style of the existing code.
thanks,
bryan
> 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
> Attachments: Change256_128.diff, Change256_128.stat,
> Position_patch_explanation.txt, position_patch_v1.diff, position_patch_v1.stat
>
>
> 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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