@@ -725,11 +725,13 @@ debugging purposes. Note that a newline terminates the query, not a
...
@@ -725,11 +725,13 @@ debugging purposes. Note that a newline terminates the query, not a
semicolon. If you have compiled with debugging symbols, you can use a
semicolon. If you have compiled with debugging symbols, you can use a
debugger to see what is happening. Because the backend was not started
debugger to see what is happening. Because the backend was not started
from the postmaster, it is not running in an identical environment and
from the postmaster, it is not running in an identical environment and
locking/backend interaction problems may not be duplicated. Some
locking/backend interaction problems may not be duplicated.<P>
debuggers can attach to an already-running backend; that is the most
convenient way to diagnose problems in the normal multi-backend
Another method is to start <I>psql</I> in one window, then find the
environment.
<small>PID</small> of the <i>postgres</i> process being used by the
<P>
<i>psql.</i> Use a debugger to attach to the <i>postgres</i>
<small>PID.</small> You can set breakpoints in the debugger and issues
queries from <i>psql.</i>
The postgres program has -s, -A, and -t options that can be very useful
The postgres program has -s, -A, and -t options that can be very useful
for debugging and performance measurements.<P>
for debugging and performance measurements.<P>
...
@@ -1061,7 +1063,11 @@ Similarly, you could retrieve the just-assigned SERIAL value with the <I>currval
...
@@ -1061,7 +1063,11 @@ Similarly, you could retrieve the just-assigned SERIAL value with the <I>currval
INSERT INTO person (name) VALUES ('Blaise Pascal');
INSERT INTO person (name) VALUES ('Blaise Pascal');
$newID = currval('person_id_seq');
$newID = currval('person_id_seq');
</PRE>
</PRE>
Finally, you could use the <AHREF="#4.17">oid</A> returned from the INSERT statement to lookup the default value, though this is probably the least portable approach. In perl, using DBI with Edmund Mergl's DBD::Pg module, the oid value is made available via $sth->{pg_oid_status} after $sth->execute().
Finally, you could use the <AHREF="#4.17">oid</A> returned from the
INSERT statement to lookup the default value, though this is probably
the least portable approach. In perl, using DBI with Edmund Mergl's
DBD::Pg module, the oid value is made available via
$sth->{pg_oid_status} after $sth->execute().
<H4><ANAME="4.16.3">4.16.3</A>) Don't currval() and nextval() lead to a race condition with other
<H4><ANAME="4.16.3">4.16.3</A>) Don't currval() and nextval() lead to a race condition with other
