From: | Tính Trương Xuân <tinh(dot)truong(at)evolus(dot)vn> |
---|---|
To: | pgsql-jdbc(at)postgresql(dot)org |
Subject: | Duplicate primary key when primary key is varchar |
Date: | 2010-10-06 10:16:54 |
Message-ID: | AANLkTin+Rj7HCigXx=3+s81N0=d7frGdbxrUY=_fZsU+@mail.gmail.com |
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Lists: | pgsql-jdbc |
Hello,
I have a very interesting situation with my database schema (attached in
this message). But first you have to import this database script into your
database:
psql -h localhost -p 5432 -U postgres -f /path/to/the/file.sql your_database
Note: this schema is virus/malware/rootkit free, you can check it for
yourself.
In the State table, you will notice that there are two rows with the primary
key is AL (it's capital A and capital L). But when you select:
select * from state where code='AL'
There is only one row returned. You may guest that there are some spaces in
the primary key? Nope!
You can verify by this query:
select 'a'||code||'b' from state
You will see that there are two rows with the data as aALb. No space in
between!
The same thing happened for a row in the Family with the code 1006 (it's
one-zero-zero-six)
There are a couple of other rows in other table as well, but not all of
them.
You may ask, how did I come up with this schema?
Basically, I am developing an reporting web application, there is an
external system exporting data files (in UTF-16 LE). Then I convert those
files into UTF-8 and use Hibernate to insert the data.
I know that there is something wrong with the encoding but there is some
wrong with PostgreSQL as well.
Here is the script I used to create the database
CREATE DATABASE bug_demo
WITH OWNER = postgres
ENCODING = 'UTF8'
TABLESPACE = pg_default
LC_COLLATE = 'en_US.utf8'
LC_CTYPE = 'en_US.utf8'
CONNECTION LIMIT = -1;
I'm using PostgreSQL 8.4.4 on ArchLinux 32bit kernel 2.6.35.7
Any input will be appreciated
Tinh
Attachment | Content-Type | Size |
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sample_schema.sql.zip | application/zip | 10.8 KB |
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