I'm using the 7.0.3 release JDBC driver, and observed that when
Postgres aborts the transaction because of a problem within a
transaction block, SQLExceptions are not always thrown from the
driver on further queries.

To demonstrate this, say I have
a table
create table x (pk int4 primary key);

Now, I start a transaction block, then insert two duplicate keys
con.setAutoCommit(false);
Statement s = con.createStatement();
s.executeUpdate("insert into x values (1)"); // works fine
try {
s.executeUpdate("insert into x values (1)"); // raises a duplicate key
SQLException
} catch (SQLException sqle) { sqle.printStackTrace(); }
s.executeUpdate("insert into x values(2)"); // no exception thrown

Looking into the code, it looked as though the *ABORT STATUS* message
in the protocol was being ignored in the driver. I've attached a patch
(against the 7.0.3 driver) of the changes that made it work better
for me.

Regards,
-kb
--- org/postgresql/Connection.java.orig Sun Feb 11 21:06:19 2001
+++ org/postgresql/Connection.java Sun Feb 11 21:06:29 2001
@@ -358,7 +358,6 @@
break;
case 'C': // Command Status
recv_status = pg_stream.ReceiveString(8192);
-
// Now handle the update count correctly.
if(recv_status.startsWith("INSERT") || recv_status.startsWith("UPDATE")
|| recv_status.startsWith("DELETE")) {
try {
@@ -374,6 +373,9 @@
}
}
}
+ else if (recv_status.startsWith("*ABORT
STATE*")) {
+ throw new
PSQLException("postgresql.con.abortedxn");
+ }
if (fields != null)
hfr = true;
else

--- org/postgresql/errors.properties.orig Tue Apr 25 22:39:32 2000
+++ org/postgresql/errors.properties Sun Feb 11 21:10:48 2001
@@ -20,6 +20,7 @@
postgresql.con.tuple:Tuple received before MetaData.
postgresql.con.type:Unknown Response Type {0}
postgresql.con.user:The user property is missing. It is mandatory.
+postgresql.con.abortedxn:The current transaction has been aborted, no more
queries are possible
postgresql.fp.error:FastPath call returned {0}
postgresql.fp.expint:Fastpath call {0} - No result was returned and we
expected an integer.
postgresql.fp.protocol:FastPath protocol error: {0}