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Update FAQ.

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Bruce Momjian
2001-10-13 03:53:45 +00:00
parent db7aa99fb9
commit 36458b93e0
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doc/src/FAQ/FAQ.html
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@ -12,7 +12,7 @@
alink="#0000FF">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Fri Oct 12 23:37:30 EDT 2001</P>
<P>Last updated: Fri Oct 12 23:53:35 EDT 2001</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
@ -1046,10 +1046,12 @@ BYTEA bytea variable-length byte array (null-safe)
value from the sequence object with the <I>nextval()</I> function
<I>before</I> inserting and then insert it explicitly. Using the
example table in <A href="#4.16.1">4.16.1</A>, that might look like
this:</P>
this in Perl:</P>
<PRE>
$newSerialID = nextval('person_id_seq');
$sql = "SELECT nextval('person_id_seq')";
$newSerialID = ($conn->selectrow_array($sql))[0];
INSERT INTO person (id, name) VALUES ($newSerialID, 'Blaise Pascal');
$res = $dbh->do($sql);
</PRE>
You would then also have the new value stored in
<CODE>$newSerialID</CODE> for use in other queries (e.g., as a
@ -1064,7 +1066,9 @@ BYTEA bytea variable-length byte array (null-safe)
<I>after</I> it was inserted by default, e.g.,</P>
<PRE>
INSERT INTO person (name) VALUES ('Blaise Pascal');
$newID = currval('person_id_seq');
$res = $conn->do($sql);
$sql = "SELECT currval('person_id_seq')";
$newSerialID = ($conn->selectrow_array($sql))[0];
</PRE>
Finally, you could use the <A href="#4.17"><SMALL>OID</SMALL></A>
returned from the <SMALL>INSERT</SMALL> statement to look up the
@ -1076,7 +1080,8 @@ BYTEA bytea variable-length byte array (null-safe)
<H4><A name="4.16.3">4.16.3</A>) Don't <I>currval()</I> and
<I>nextval()</I> lead to a race condition with other users?</H4>
<P>No. This is handled by the backends.</P>
<P>No. Currval() returns the current value assigned by your
backend, not by all users.</P>
<H4><A name="4.17">4.17</A>) What is an <SMALL>OID</SMALL>? What is
a <SMALL>TID</SMALL>?</H4>