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Re: InstantDB: Exception with LEFT OUTER JOIN


Philip

Thank you for reporting this bug, and thank you for taking the trouble to
put a script together to illustrate the problem - it makes my job a lot
easier.

This bug will be fixed in 3.20 beta 1 which will be available shortly. If
this is causing you serious problems then let me know and I'll see if I can
get a patch to you faster.

Regards

Peter Hearty
Lutris Technologies UK Ltd.
-----Original Message-----
From: Phillip Baird <phillip.baird@clear.net.nz>
To: instantdb@enhydra.org <instantdb@enhydra.org>
Date: 16 July 2000 06:01
Subject: InstantDB: Exception with LEFT OUTER JOIN


Hi,

I've just started using InstantDB (3.14) and have come across a problem with
the following query...

SELECT country.id, country.name, city.id, city.name FROM country LEFT OUTER
JOIN city ON country.id=city.country_id;

This results in the following exception...

java.sql.SQLException: Error fetching row in joined table:
java.sql.SQLException: IO problem: java.io.IOException: Negative seek
offsetNegative seek offset
        at org.enhydra.instantdb.db.SQLProg.execute(SQLProg.java:276)
        at
org.enhydra.instantdb.jdbc.idbStatement.execute(idbStatement.java:235)
        at
org.enhydra.instantdb.jdbc.idbStatement.executeQuery(idbStatement.java:91)
        at org.enhydra.instantdb.SampleThread.run(ScriptTool.java:542)
        at java.lang.Thread.run(Unknown Source)

If I add a WHERE clause everything works as expected e.g. SELECT country.id,
country.name, city.id, city.name FROM country LEFT OUTER JOIN city ON
country.id=city.country_id WHERE country.id = 1;

However other WHERE conditions fail, eg country.id >= 1

Here is a script that reproduces the problem...

; First load the JDBC driver and open a database.
d org.enhydra.instantdb.jdbc.idbDriver;
o jdbc:idb=sample.prp;

; dump SQL and results to "trace.log"
e SET EXPORT "trace.log" TRACE 2 CONSOLE;

; Create the tables
e DROP TABLE country;
e CREATE TABLE country (
  id     int not null,
  name   varchar(200) not null );
e CREATE UNIQUE INDEX country_pk ON country ( id );

e DROP TABLE city;
e CREATE TABLE city (
  id         int not null,
  country_id int not null,
  name       varchar(200) not null );
e CREATE UNIQUE INDEX city_pk ON city ( id );

; Create a country with no cities.
e INSERT INTO country (id,name) VALUES (1,"USA");

; Returns single country with nulls for city.id and city.name - as expected.
q SELECT country.id, country.name, city.id, city.name FROM country LEFT
OUTER JOIN city ON country.id=city.country_id WHERE country.id = 1;

; Same as above but without the WHERE clause.  Result should be the same.
Creates java.io exception!!
q SELECT country.id, country.name, city.id, city.name FROM country LEFT
OUTER JOIN city ON country.id=city.country_id;

c close;


Hope someone can help.

Kind regards,

Phillip Baird


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