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Date: Mon, 6 Nov 2000 09:15:04 +0100 (CET)

From: Karel Zak <zakkr@zf.jcu.cz>

To: Christof Petig <christof.petig@wtal.de>

cc: Zeugswetter Andreas SB <ZeugswetterA@wien.spardat.at>,

The Hermit Hacker <scrappy@hub.org>, pgsql-hackers@postgresql.org

Subject: Re: AW: [HACKERS] Re: [GENERAL] Query caching

In-Reply-To: <3A02DDFF.E8CBFCF3@wtal.de>

Message-ID: <Pine.LNX.3.96.1001106090801.20612C-100000@ara.zf.jcu.cz>

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Status: OR

On Fri, 3 Nov 2000, Christof Petig wrote:

> Karel Zak wrote:

>

> > On Thu, 2 Nov 2000, Zeugswetter Andreas SB wrote:

> >

> > >

> > > > Well I can re-write and resubmit this patch. Add it as a

> > > > compile time option

> > > > is not bad idea. Second possibility is distribute it as patch

> > > > in the contrib

> > > > tree. And if it until not good tested not dirty with this main tree...

> > > >

> > > > Ok, I next week prepare it...

> > >

> > > One thing that worries me though is, that it extends the sql language,

> > > and there has been no discussion about the chosen syntax.

> > >

> > > Imho the standard embedded SQL syntax (prepare ...) could be a

> > > starting point.

> >

> > Yes, you are right... my PREPARE/EXECUTE is not too much ready to SQL92,

> > I some old letter I speculate about "SAVE/EXECUTE PLAN" instead

> > PREPARE/EXECUTE. But don't forget, it will *experimental* patch... we can

> > change it in future ..etc.

> >

> > Karel

>

> [Sorry, I didn't look into your patch, yet.]

Please, read my old query cache and PREPARE/EXECUTE description...

> What about parameters? Normally you can prepare a statement and execute it

We have in PG parameters, see SPI, but now it's used inside backend only

and not exist statement that allows to use this feature in be<->fe.

> using different parameters. AFAIK postgres' frontend-backend protocol is not

> designed to take parameters for statements (e.g. like result presents

> results). A very long road to go.

> By the way, I'm somewhat interested in getting this feature in. Perhaps it

> should be part of a protocol redesign (e.g. binary parameters/results).

> Handling endianness is one aspect, floats are harder (but float->ascii->float

> sometimes fails as well).

PREPARE <name> AS <query>

[ USING type, ... typeN ]

[ NOSHARE | SHARE | GLOBAL ]

EXECUTE <name>

[ INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table ]

[ USING val, ... valN ]

[ NOSHARE | SHARE | GLOBAL ]

DEALLOCATE PREPARE

[ <name> [ NOSHARE | SHARE | GLOBAL ]]

[ ALL | ALL INTERNAL ]

An example:

PREPARE chris_query AS SELECT * FROM pg_class WHERE relname = $1 USING text;

EXECUTE chris_query USING 'pg_shadow';

Or mean you something other?

Karel

From pgsql-hackers-owner+M444@postgresql.org Thu Nov 9 03:32:10 2000

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Thu, 9 Nov 2000 09:23:41 +0100

Date: Thu, 9 Nov 2000 09:23:41 +0100 (CET)

From: Karel Zak <zakkr@zf.jcu.cz>

To: Christof Petig <christof.petig@wtal.de>

cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>,

Michael Meskes <meskes@postgresql.org>,

Zeugswetter Andreas SB <ZeugswetterA@wien.spardat.at>,

The Hermit Hacker <scrappy@hub.org>

Subject: Re: AW: [HACKERS] Re: [GENERAL] Query caching

In-Reply-To: <3A096BCE.F9887955@wtal.de>

Message-ID: <Pine.LNX.3.96.1001109090739.8052B-100000@ara.zf.jcu.cz>

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On Wed, 8 Nov 2000, Christof Petig wrote:

> Karel Zak wrote:

>

> > > What about parameters? Normally you can prepare a statement and execute it

> >

> > We have in PG parameters, see SPI, but now it's used inside backend only

> > and not exist statement that allows to use this feature in be<->fe.

>

> Sad. Since ecpg would certainly benefit from this.

>

> > > using different parameters. AFAIK postgres' frontend-backend protocol is not

> > > designed to take parameters for statements (e.g. like result presents

> > > results). A very long road to go.

> > > By the way, I'm somewhat interested in getting this feature in. Perhaps it

> > > should be part of a protocol redesign (e.g. binary parameters/results).

> > > Handling endianness is one aspect, floats are harder (but float->ascii->float

> > > sometimes fails as well).

> >

> > PREPARE <name> AS <query>

> > [ USING type, ... typeN ]

> > [ NOSHARE | SHARE | GLOBAL ]

> >

> > EXECUTE <name>

> > [ INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table ]

> > [ USING val, ... valN ]

> > [ NOSHARE | SHARE | GLOBAL ]

> >

> > DEALLOCATE PREPARE

> > [ <name> [ NOSHARE | SHARE | GLOBAL ]]

> > [ ALL | ALL INTERNAL ]

> >

> > An example:

> >

> > PREPARE chris_query AS SELECT * FROM pg_class WHERE relname = $1 USING text;

>

> I would prefer '?' as a parameter name, since this is in the embedded sql standard

> (do you have a copy of the 94 draft? I can mail mine to you?)

This not depend on query cache. The '$n' is PostgreSQL query parametr

keyword and is defined in standard parser. The PREPARE statement not parsing

query it's job for standard parser.

> Also the standard says a whole lot about guessing the parameter's type.

>

> Also I vote for ?::type or type(?) or sql's cast(...) (don't know it's syntax)

> instead of abusing the using keyword.

The postgresql executor expect types of parametrs in separate input (array).

I not sure how much expensive/executable is survey it from query.

> > EXECUTE chris_query USING 'pg_shadow';

>

> Great idea of yours to implement this! Since I was thinking about implementing a

> more decent schema for ecpg but had no mind to touch the backend and be-fe

> protocol (yet).

> It would be desirable to do an 'execute immediate using', since using input

> parameters would take a lot of code away from ecpg.

By the way, PREPARE/EXECUTE is face only. More interesting in this period is

query-cache-kernel. SQL92 is really a little unlike my PREPARE/EXECUTE.

Karel

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<title>Porting PostgreSQL to Windows 2000 procedures</title>

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* You can get the most recent version of this from

http://people.freebsd.org/~kevlo/postgres/portNT.html.

* Problem reports can be sent to pgsql-ports@postgresql.org.

<h1>Porting PostgreSQL to Windows 2000 installation procedures</h1>

Thanks to <a href="mailto:horak@mmp.plzen-city.cz">Daniel Horak</a>, <a href="mailto:Jason.Tishler@dothill.com">

JasonTishler</a> ,<a href="mailto:JKraaijeveld@askesis.nl">Joost Kraaijeveld

</a>and <a href="mailto:gsez020@kryten.bedford.waii.com">Pete Forman</a>for

their helps.<br>

Without them, I cannot port Postgres to Windows 2000 successfully.<br>

<hr width="100%">

<li><b>Install the lastest verion(1.1.5) of Cygwin</b></li>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.

Click on the "Install Cygwin now" link on the <a href="http://sources.redhat.com/cygwin">

http://sources.redhat.com/cygwin</a>webpage.<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

This downloads setup.exe to your system.<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.

Run setup and answer all of the questions. Please choose a mirror sitefor

your download.

<li><b>Install Charles Wilson's Cygwin32 IPC package</b></li>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.

Download the precompiled binary <a href="http://www.neuro.gatech.edu/users/cwilson/cygutils/V1.1/cygipc/cygipc-1.07-1.tar.gz">

http://www.neuro.gatech.edu/users/cwilson/cygutils/V1.1/cygipc/cygipc-1.07-1.tar.gz</a>in"/" directory.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.

tar zxvf cygipc-1.07-1.tar.gz

<li><b>Install PostgreSQL 7.0.3</b></li>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.

Download PostgreSQL 7.0.3 <a href="ftp://ftp.postgresql.org/pub/v7.0.3/postgresql-7.0.3.tar.gz">

sourcecode </a>in /usr/src.<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.

tar zxvf postgresql-7.0.3.tar.gz<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.

mkdir -p /usr/local/pgsql/{bin,include,lib,data}<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.

cd /usr/src/postgresql-7.0.3/src/win32<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.

cp endian.h /usr/include<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

cp tcp.h /usr/include/netinet<br>

&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 6. Apply <a href="mailto:Jason.Tishler@dothill.com">

Jason Tishler</a>'s<a href="http://people.freebsd.org/~kevlo/postgres/patch.diff">

patches&nbsp; </a>in /usr/src/postgresql-7.0.3, then run 'patch -p1 &lt;patch.diff'.

&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <b>Note that

some browsers convert the patch to a text mode file (i.e., CRNL line endings)

&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; during the save operation

which causes patch &nbsp;&nbsp; to reject all hunks.</b><br>

&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 7. cd /usr/src/postgresql-7.0.3/src,

then run './configure'<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 8. make; make install<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 9. cp/usr/local/pgsql/lib/pq.dll

/usr/local/pgsql/bin<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 10. Usingany editor to create .bashrc

in / directory as belows:<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

PATH=$PATH:/usr/local/pgsql/bin:/usr/local/bin<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

PGDATA=/usr/local/pgsql/data<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

PGLIB=/usr/local/pgsql/lib<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

LD_LIBRARY_PATH=/usr/local/pgsql/lib:/usr/local/lib<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

export LD_LIBRARY_PATH PATH PGDATA PGLIB<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 11. source/.bashrc, then run 'initdb'

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

<i>Note that the owner of the DB system have to be different from root/administrator</i>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 12. Editthe file /usr/local/pgsql/data/pg_hba.conf,

such as:

<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

host&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; all&nbsp;&nbsp;&nbsp;&nbsp;

163.17.11.109&nbsp;&nbsp; 255.255.255.0&nbsp;&nbsp; trust</p>

<p> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 13. ipc-daemon&amp;<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 14. postmaster-i&amp;<br>

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 15. Run' psql -h host_name template1'.

It's easy, huh :-)<br>

&nbsp;<br>

&nbsp;<br>

<p><i><font size="+1">Last updated: 01/05/2001 &nbsp;&nbsp; Author:<a href="mailto:kevlo@FreeBSD.org">

KevinLo</a></font></i></p>