From: | "David Wall" <d(dot)wall(at)computer(dot)org> |
---|---|
To: | "Rod Taylor" <rbt(at)rbt(dot)ca> |
Cc: | <pgsql-jdbc(at)postgresql(dot)org> |
Subject: | Re: Large queries; fetchsize, cursors and limit/offset |
Date: | 2003-11-03 23:49:56 |
Message-ID: | 078101c3a265$3e8c8920$3201a8c0@rasta |
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Lists: | pgsql-jdbc |
Does anybody have some sample code that shows how to declare a simple cursor
and fetch it 100 rows at a time, for example? I'm curious how to formulate
this. It sounds like I need to keep the same Connection object, which is
good info to have. How do I issue the DECLARE CURSOR and FETCH (using
PreparedStatement.execute() with the FETCH being an executeQuery() so that I
get a result set back)?
From what I gather, the SQL itself looks something like:
DECLARE my_cursor CURSOR FOR SELECT x,y,z FROM abc_table WHERE x>4;
FETCH 100 FROM my_cursor;
CLOSE cursor;
What do I call when I'm doing the DECLARE CURSOR, versus the FETCH versus
the CLOSE commands?
Does anybody know if this sort of code would then work in Oracle 8i if I
used a modified set of Oracle commands, i.e. something like:
DECLARE CURSOR my_cursor FOR SELECT x,y,z FROM abc_table WHERE x>4;
END;
FOR 100 FETCH my_cursor; ??? No "host variables" with JDBC so I'm not sure
I can do this since the syntax implies an "INTO" clause for using host
variables.
Thanks,
David
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