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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

InstantDB: select madness, part II


With much interest I followed the Thread 'select madness' on this
mailing list. I thought it would also solve a problem I have. But no. So
I decided to ask for:

( I am using V3.21 with Sun's JDK 1.3 on Windows 2000)

Relevant to the problem are two tables (which are "linked" together by
bet.from_oid = gambler2season.oid. So from_oid could be defined as
foreign key, but I started using InstantDB with V3.13 and do not use
this feature of the new version (yet)):

e CREATE TABLE gambler2season (
    oid char(16) PRIMARY KEY,
    object_version integer,
    total int,
    gambler_oid char(16) NOT NULL,
    season_oid char(16) NOT NULL
);
e CREATE UNIQUE INDEX gambler2season_oid ON gambler2season (oid);
e CREATE INDEX gambler2season_gambler ON gambler2season (gambler_oid);
e CREATE INDEX gambler2season_season ON gambler2season (season_oid);


e CREATE TABLE bet (
    oid char(16) PRIMARY KEY,
    object_version integer,
    value integer,
    arrival timestamp,
    hscore integer,
    ascore integer,
    from_oid char(16) NOT NULL,
    game_oid char(16) NOT NULL
);
e CREATE UNIQUE INDEX bet_oid ON bet (oid);
e CREATE INDEX bet_from ON bet (from_oid);
e CREATE INDEX bet_game ON bet (game_oid);


They are filled with some sample data (I provide a zipped file with the
DB in a seperate mail). To show the problem I do a series of queries:

1. SELECT COUNT(*) FROM gambler2season
Result: 3

2. SELECT COUNT(*) FROM gambler2season WHERE season_oid =
'________1___1__1'
Result: 3

These two queries show, that the condition (which is used later on) is
met by each record in the table.

3. SELECT COUNT(*) FROM gambler2season g2s, bet b WHERE g2s.oid =
b.from_oid
Result: 27

This join works fine.

4. SELECT COUNT(*) FROM gambler2season g2s, bet b WHERE g2s.season_oid =
'________1___1__1' AND g2s.oid = b.from_oid
Result: 3

Now, simply by adding above condition I get the false result. And when I
try to check which 3 of 27 results InstantDB found, I even get an
exception (which is useless to me).

5. SELECT * FROM gambler2season g2s, bet b WHERE g2s.season_oid =
'________1___1__1' AND g2s.oid = b.from_oid
Exception:
java.sql.SQLException: java.lang.String
        at org.enhydra.instantdb.db.SQLProg.execute(SQLProg.java:276)
        at
org.enhydra.instantdb.jdbc.idbStatement.execute(idbStatement.java:235)
        at org.enhydra.instantdb.JDBCAppl.action(JDBCAppl.java:85)
        at java.awt.Component.handleEvent(Component.java:3906)
        at org.enhydra.instantdb.JDBCAppl.handleEvent(JDBCAppl.java:212)

        at java.awt.Component.postEvent(Component.java:2790)
        at java.awt.Component.postEvent(Component.java:2800)
        at java.awt.Component.postEvent(Component.java:2800)
        at java.awt.Component.postEvent(Component.java:2800)
        at java.awt.Component.dispatchEventImpl(Component.java:2607)
        at java.awt.Component.dispatchEvent(Component.java:2499)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)
        at
java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)
        at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)



After reading the 'select madness' thread I happily tried setting
'strictLiterals=1'. But still the same result.

Do you have any explanation on this?

Thanks

Carsten Vosshenrich


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