autocommit and stored procedures

[roehm(at)it(dot)usyd(dot)edu(dot)au]

Hi,

Which command granularity does the JDBC driver's autocommit have?
Does it commit after each client-side JDBC statement, or does it commit
each individual SQL statement on the server-side?
In particular, does an JDBC autocommit around the call to a stored  
procedure
commit each statement within that stored procedure, or does it commit  
the
procedure as a whole?

Example:

Stored Procedure
----------------
CREATE PROCEDURE Test (n varying character,val REAL)
DECLARE	
   cid INTEGER;
BEGIN
   SELECT custid INTO cid
     FROM account
    WHERE name=n;

   UPDATE checking
      SET balance=balance-val
    WHERE custid=cid;
END;

JDBC Code
---------
Connection conn;
CallableStatement cstmt;
conn.setAutoCommit(true);
cstmt = conn.prepareCall("{call Test(?,?)}");
cstmt.setString(1, name);
cstmt.setString(2, value);
cstmt.execute();


Does PostgreSQL execute one commit after the execution of Test(),
i.e. do select and update run in one transaction?
Or will PostgreSQL commit after the select and then again after the  
update
inside the Test() procedure?

Does anyone know what the specified behaviour is for JDBC AutoCommit?

Many thanks

Uwe