db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2967) Single character does not match high value unicode character with collation TERRITORY_BASED
Date Mon, 27 Aug 2007 18:09:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523073
] 

Daniel John Debrunner commented on DERBY-2967:
----------------------------------------------

Are there any numbers for the performance benefit seen by using this int arrays over CollationElementIterator?

One potential problem with the arrays is that the array is fully populated even if the value
could be disqualified on the first character, that would seem to degrade performance, not
improve it.

> Single character does not match high value unicode character with collation TERRITORY_BASED
> -------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2967
>                 URL: https://issues.apache.org/jira/browse/DERBY-2967
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Kathey Marsden
>         Attachments: TestFrench.java, TestNorway.java
>
>
> With TERRITORY_BASED collation '_' does not match  the character \uFA2D.  It is the same
for english or norwegian. FOR collation UCS_BASIC it matches fine.  Could you tell me if this
is a bug?
> Here is a program to reproduce.
> import java.sql.*;
> public class HighCharacter {
>    public static void main(String args[]) throws Exception
>    {
>    System.out.println("\n Territory no_NO");
>    Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
>    Connection conn = DriverManager.getConnection("jdbc:derby:nordb;create=true;territory=no_NO;collation=TERRITORY_BASED");
>    testLikeWithHighestValidCharacter(conn);
>    conn.close();
>    System.out.println("\n Territory en_US");
>    conn = DriverManager.getConnection("jdbc:derby:endb;create=true;territory=en_US;collation=TERRITORY_BASED");
>    testLikeWithHighestValidCharacter(conn);
>    conn.close();
>    System.out.println("\n Collation USC_BASIC");
>    conn = DriverManager.getConnection("jdbc:derby:basicdb;create=true");
>    testLikeWithHighestValidCharacter(conn);
>    }
> public static  void testLikeWithHighestValidCharacter(Connection conn) throws SQLException
{
>    Statement stmt = conn.createStatement();
>    try {
>    stmt.executeUpdate("drop table t1");
>    }catch (SQLException se)
>    {// drop failure ok.
>    }
>    stmt.executeUpdate("create table t1(c11 int)");
>    stmt.executeUpdate("insert into t1 values 1");
>  
>    // \uFA2D - the highest valid character according to
>    // Character.isDefined() of JDK 1.4;
>    PreparedStatement ps =
>    conn.prepareStatement("select 1 from t1 where '\uFA2D' like ?");
>      String[] match = { "%", "_", "\uFA2D" };
>    for (int i = 0; i < match.length; i++) {
>    System.out.println("select 1 from t1 where '\\uFA2D' like " + match[i]);
>    ps.setString(1, match[i]);
>    ResultSet rs = ps.executeQuery();
>    if( rs.next() && rs.getString(1).equals("1"))
>        System.out.println("PASS");
>    else          System.out.println("FAIL: no match");
>    rs.close();
>    }
>   }
> }
> Mamta made some comments on this issue in the following thread:
> http://www.nabble.com/Single-character-does-not-match-high-value-unicode-character-with-collation-TERRITORY_BASED.-Is-this-a-bug-tf4118767.html

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message