Re: Questions on Cursors in PostgreSQL

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2017-06-27 20:07 GMT+03:00 Wei Shan <[email protected]>:

> Hi all,
>
> I have some questions on PostgreSQL cursors (not PL/pgSQL but the libpq
> implementation):
>
>
>    1. What happens when my cursor hit the end of the table? Does it close
>    automatically? I suppose if I declare it as a SCROLLABLE cursor, it should
>    not close at all.
>
> The lifetime of cursors created by the DECLARE ... SQL command longs until
the end of the session, or until it explicitly closed by either CLOSE ...
or DISCARD SQL commands.

>
>    1. If I have declared a cursor and the session got disconnected, can I
>    reattach back to the cursor if I know the cursor name? I believe this is
>    not possible but I'm not very sure.
>
> When session ends all cursors are deallocated automatically. You should
open the new cursor on reconnect.

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">2017-06-27 20:07 GMT+03:00 Wei Shan <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:[email protected]" target=3D"_blank">[email protected]</a>&gt;=
</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi all,<div><br=
></div><div>I have some questions on PostgreSQL cursors (not PL/pgSQL but t=
he libpq implementation):=C2=A0</div><div><br></div><div><ol><li>What happe=
ns when my cursor hit the end of the table? Does it close automatically? I =
suppose if I declare it as a SCROLLABLE cursor, it should not close at all.=
</li></ol></div></div></blockquote><div>The lifetime of cursors created by =
the DECLARE ... SQL command longs until the end of the session, or until it=
 explicitly closed by either CLOSE ... or DISCARD SQL commands.</div><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><div dir=3D"ltr"><div><ol><li>If I have declared a=
 cursor and the session got disconnected, can I reattach back to the cursor=
 if I know the cursor name? I believe this is not possible but I&#39;m not =
very sure.</li></ol></div></div></blockquote><div>When session ends all cur=
sors are deallocated automatically. You should open the new cursor on recon=
nect.</div></div></div></div>

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