From: | "Martin Kresse" <mkresse(at)slyde(dot)in-berlin(dot)de> |
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To: | pgsql-interfaces(at)postgresql(dot)org |
Subject: | NOTIFY/LISTEN with JDBC |
Date: | 2000-02-10 08:28:05 |
Message-ID: | 200002100825.JAA05019@mail.vr.IN-Berlin.DE |
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Lists: | pgsql-interfaces |
Hi there,
I'm writing a database application in Java, which needs to get
notified about changes in the database. Therefore I'd like to use the
NOTIFY/LISTEN mechanism, but I can't get it working with JDBC. I
was told, to use connection.getWarnings() method to retrieve
notifications, which doesn't seem to work. I'm using PostgreSQL
6.5.1 with the JDBC-Driver 6.5 for jdk1.1, and the following code
doesn't produce any output, while a parallel running psql-shell
displays the notifications...
Connection c = DriverManager.getConnection(...);
Statement s = c.createStatement();
s.execute("LISTEN test");
while(true) {
s.execute("NOTIFY test");
SQLWarning w = c.getWarnings();
if (w != null)
System.out.println(w.getMessage());
try {
Thread.sleep(2000);
} catch (InterruptedException ex) {}
}
Am I doing something wrong?
Thanks a lot for your help,
Martin Kresse
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