JDBC, PgSQL 7.2: transactions not supported!!

Hi,

I am using JDBC Driver to access PgSQL 7.2. When I
add:

Statement.executeQuery("BEGIN WORK;");
...
Statement.executeQuery("Insert.........");
...

Statement.executeQuery("COMMIT WORK;");

in the java code.

I got:
transactions not supported!!

According the document of 7.2, transaction is
supported. Does anyone know what's wrong here?

Thanks!

Zengfa

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