Обсуждение: My First Function
Hi all, Background To date I've been using perl and DBI/DBD:Pg. I've done everything except SQL stuff in perl and done okay(ish). I'm just about to teach myself PHP before starting a new project, and have in front of me a problem. A number of perl subs that I've used in the past will now need porting to PHP. Any new routines would need to to written in both. Thus, I've decided to also learn plsql in an attempt reduce my workload. As I work best from examples and tutorials than I do from manuals, I was wondering if some kind sole would write my first function for me. (This task is a little extreme, basically what I will need) The function I want is to provide access control to functions I will be writing on a web site for REVCOM, a UK Charity. The idea is that I have members who may hold positions on the management committee. There is a many-to-many relationship between positions and members. Access to functions is dependant on the position held by a member. For example, the treasurer can update the accounts, the secretary can view the accounts. If both positions are held by the same person then the treasurer's rights should be returned for that function. The result should be an integer where -1 = no access, or a +ID gives increasing permissions. I want to be able to pass a member ID and a function ID and return the highest permission for the two. The cut-down schema is: Members table holds member details MID int4 (Primary key) member ID Functions table holds function details FID int4 (Primary key) function ID Positions table Holds Comittee Position details PID int4 (Primary key) Position ID Holder table Relationship between members and positions HMID int4 Position holding member's ID HPID int4 Position ID Permissions table Relationship between functions and committee positions PFID int4 Function ID PPID int4 Position ID PPERM permission level I understand that this is a biggie, but I thought if I could understand how this worked, I could learn much from it. -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
> >I want to be able to pass a member ID and a function ID and return the >highest permission for the two. The cut-down schema is: > Hello , Perhaps this SQL works for you: select PPID,Max(PPERM) from permtable where PFID = 'FUNCTION_ID' and PPID in ( select HPID from holdertable where HMID='MEMBER_ID' ) group by PPID; You will face some problems returning more than one value from this SQL if using it in a function. Though,I believe if you are going to use a PHP script it can easilly be handled with it. Hope that helps Omid Omoomi _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
Okay, thanks for that. I'm getting far enough with my SQL to be able to read and understand that one, but how do I put that into a plsql function and how do I call it. Lets asume I've changed the relationship so that there is only one person per position, so only one integer should be returned. How do I get that integer returned to my perl/php script, and how do I return -1 if the result of the query is empty? Gary On Sunday 01 July 2001 5:39 pm, omid omoomi wrote: > >I want to be able to pass a member ID and a function ID and return the > >highest permission for the two. The cut-down schema is: > > Hello , > Perhaps this SQL works for you: > > select PPID,Max(PPERM) > from permtable > where > PFID = 'FUNCTION_ID' > and > PPID in ( select HPID from holdertable where HMID='MEMBER_ID' ) > group by PPID; > > You will face some problems returning more than one value from this SQL if > using it in a function. > Though,I believe if you are going to use a PHP script it can easilly be > handled with it. > > Hope that helps > Omid Omoomi > _________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
Hi,
Then you would need some more normalized tables. But anyway ...
create function maxfunc(text,text)
returns int4 as '
select Max(PPERM) from permtable,holdertables
where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; '
language 'sql' ;
...where $1,$2 are the arguments.
This would give you the corresponding access level number.
But If using PHP then you may have some thing like this:
<?php
$conn = pg_pconnect("localhost","","","","DB");
$result = pg_Exec ($conn, " select Max(PPERM) from permtable,holdertables
where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; ");
if (!$result) { $Acclevel = -1 ; } /* if no record found
else { $Acclevel = pg_result($result,0,0);) /* if found a record
?>
I havn't test it my self, but sure it would work.
good luck
Omid
>From: Gary Stainburn <gary.stainburn@ringways.co.uk>
>To: "omid omoomi" <oomoomi@hotmail.com>, gary.stainburn@ringways.co.uk,
>pgsql-sql@postgresql.org
>Subject: Re: [SQL] My First Function
>Date: Tue, 3 Jul 2001 17:08:06 +0100
>
>Okay, thanks for that.
>
>I'm getting far enough with my SQL to be able to read and understand that
>one, but how do I put that into a plsql function and how do I call it.
>
>Lets asume I've changed the relationship so that there is only one person
>per
>position, so only one integer should be returned. How do I get that
>integer
>returned to my perl/php script, and how do I return -1 if the result of the
>query is empty?
>
>Gary
>
>On Sunday 01 July 2001 5:39 pm, omid omoomi wrote:
> > >I want to be able to pass a member ID and a function ID and return the
> > >highest permission for the two. The cut-down schema is:
> >
> > Hello ,
> > Perhaps this SQL works for you:
> >
> > select PPID,Max(PPERM)
> > from permtable
> > where
> > PFID = 'FUNCTION_ID'
> > and
> > PPID in ( select HPID from holdertable where HMID='MEMBER_ID' )
> > group by PPID;
> >
> > You will face some problems returning more than one value from this SQL
>if
> > using it in a function.
> > Though,I believe if you are going to use a PHP script it can easilly be
> > handled with it.
> >
> > Hope that helps
> > Omid Omoomi
> >
>_________________________________________________________________________
> > Get Your Private, Free E-mail from MSN Hotmail at
>http://www.hotmail.com.
>
>--
>Gary Stainburn
>
>This email does not contain private or confidential material as it
>may be snooped on by interested government parties for unknown
>and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
>
>---------------------------(end of broadcast)---------------------------
>TIP 4: Don't 'kill -9' the postmaster
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
Hi Omid,
Thanks for this, I can more or less read it so I should be able to
(eventually) write similar ones.
I noticed you put "langualge 'sql'". Presumaby this is because the whole
thing is done as one select statement, therefore not needing 'plsql'. What
sort of extra stuff do you get from plsql? and can you suggest good places to
look at example plsql code?
Gary.
On Wednesday 04 July 2001 1:40 pm, omid omoomi wrote:
> Hi,
> Then you would need some more normalized tables. But anyway ...
>
> create function maxfunc(text,text)
> returns int4 as '
> select Max(PPERM) from permtable,holdertables
> where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; '
> language 'sql' ;
>
> ...where $1,$2 are the arguments.
>
> This would give you the corresponding access level number.
>
> But If using PHP then you may have some thing like this:
>
> <?php
> $conn = pg_pconnect("localhost","","","","DB");
> $result = pg_Exec ($conn, " select Max(PPERM) from permtable,holdertables
> where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; ");
>
> if (!$result) { $Acclevel = -1 ; } /* if no record found
> else { $Acclevel = pg_result($result,0,0);) /* if found a record
>
> ?>
>
> I havn't test it my self, but sure it would work.
>
> good luck
> Omid
>
>
> From: Gary Stainburn <gary.stainburn@ringways.co.uk>
>
> >To: "omid omoomi" <oomoomi@hotmail.com>, gary.stainburn@ringways.co.uk,
> >pgsql-sql@postgresql.org
> >Subject: Re: [SQL] My First Function
> >Date: Tue, 3 Jul 2001 17:08:06 +0100
> >
> >Okay, thanks for that.
> >
> >I'm getting far enough with my SQL to be able to read and understand that
> >one, but how do I put that into a plsql function and how do I call it.
> >
> >Lets asume I've changed the relationship so that there is only one person
> >per
> >position, so only one integer should be returned. How do I get that
> >integer
> >returned to my perl/php script, and how do I return -1 if the result of
> > the query is empty?
> >
> >Gary
> >
> >On Sunday 01 July 2001 5:39 pm, omid omoomi wrote:
> > > >I want to be able to pass a member ID and a function ID and return the
> > > >highest permission for the two. The cut-down schema is:
> > >
> > > Hello ,
> > > Perhaps this SQL works for you:
> > >
> > > select PPID,Max(PPERM)
> > > from permtable
> > > where
> > > PFID = 'FUNCTION_ID'
> > > and
> > > PPID in ( select HPID from holdertable where HMID='MEMBER_ID' )
> > > group by PPID;
> > >
> > > You will face some problems returning more than one value from this SQL
> >
> >if
> >
> > > using it in a function.
> > > Though,I believe if you are going to use a PHP script it can easilly be
> > > handled with it.
> > >
> > > Hope that helps
> > > Omid Omoomi
> >
> >_________________________________________________________________________
> >
> > > Get Your Private, Free E-mail from MSN Hotmail at
> >
> >http://www.hotmail.com.
> >
> >--
> >Gary Stainburn
> >
> >This email does not contain private or confidential material as it
> >may be snooped on by interested government parties for unknown
> >and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
> >
> >---------------------------(end of broadcast)---------------------------
> >TIP 4: Don't 'kill -9' the postmaster
>
> _________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
--
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
http://postgresql.bteg.net/devel-corner/docs/postgres/plpgsql.html >From: Gary Stainburn <gary.stainburn@ringways.co.uk> >To: "omid omoomi" <oomoomi@hotmail.com>, gary.stainburn@ringways.co.uk, >pgsql-sql@postgresql.org >Subject: Re: [SQL] My First Function >Date: Wed, 4 Jul 2001 13:41:29 +0100 > >Hi Omid, > >Thanks for this, I can more or less read it so I should be able to >(eventually) write similar ones. > >I noticed you put "langualge 'sql'". Presumaby this is because the whole >thing is done as one select statement, therefore not needing 'plsql'. What >sort of extra stuff do you get from plsql? and can you suggest good places >to >look at example plsql code? > >Gary. > >On Wednesday 04 July 2001 1:40 pm, omid omoomi wrote: > > Hi, > > Then you would need some more normalized tables. But anyway ... > > > > create function maxfunc(text,text) > > returns int4 as ' > > select Max(PPERM) from permtable,holdertables > > where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; ' > > language 'sql' ; > > > > ...where $1,$2 are the arguments. > > > > This would give you the corresponding access level number. > > > > But If using PHP then you may have some thing like this: > > > > <?php > > $conn = pg_pconnect("localhost","","","","DB"); > > $result = pg_Exec ($conn, " select Max(PPERM) from >permtable,holdertables > > where PFID = $1 and PPID = HPID and HMID= $2 group by PPID; "); > > > > if (!$result) { $Acclevel = -1 ; } /* if no record found > > else { $Acclevel = pg_result($result,0,0);) /* if found a record > > > > ?> > > > > I havn't test it my self, but sure it would work. > > > > good luck > > Omid > > > > > > From: Gary Stainburn <gary.stainburn@ringways.co.uk> > > > > >To: "omid omoomi" <oomoomi@hotmail.com>, gary.stainburn@ringways.co.uk, > > >pgsql-sql@postgresql.org > > >Subject: Re: [SQL] My First Function > > >Date: Tue, 3 Jul 2001 17:08:06 +0100 > > > > > >Okay, thanks for that. > > > > > >I'm getting far enough with my SQL to be able to read and understand >that > > >one, but how do I put that into a plsql function and how do I call it. > > > > > >Lets asume I've changed the relationship so that there is only one >person > > >per > > >position, so only one integer should be returned. How do I get that > > >integer > > >returned to my perl/php script, and how do I return -1 if the result of > > > the query is empty? > > > > > >Gary > > > > > >On Sunday 01 July 2001 5:39 pm, omid omoomi wrote: > > > > >I want to be able to pass a member ID and a function ID and return >the > > > > >highest permission for the two. The cut-down schema is: > > > > > > > > Hello , > > > > Perhaps this SQL works for you: > > > > > > > > select PPID,Max(PPERM) > > > > from permtable > > > > where > > > > PFID = 'FUNCTION_ID' > > > > and > > > > PPID in ( select HPID from holdertable where HMID='MEMBER_ID' ) > > > > group by PPID; > > > > > > > > You will face some problems returning more than one value from this >SQL > > > > > >if > > > > > > > using it in a function. > > > > Though,I believe if you are going to use a PHP script it can easilly >be > > > > handled with it. > > > > > > > > Hope that helps > > > > Omid Omoomi > > > > > > >_________________________________________________________________________ > > > > > > > Get Your Private, Free E-mail from MSN Hotmail at > > > > > >http://www.hotmail.com. > > > > > >-- > > >Gary Stainburn > > > > > >This email does not contain private or confidential material as it > > >may be snooped on by interested government parties for unknown > > >and undisclosed purposes - Regulation of Investigatory Powers Act, 2000 > > > > > >---------------------------(end of >broadcast)--------------------------- > > >TIP 4: Don't 'kill -9' the postmaster > > > > >_________________________________________________________________________ > > Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com. > >-- >Gary Stainburn > >This email does not contain private or confidential material as it >may be snooped on by interested government parties for unknown >and undisclosed purposes - Regulation of Investigatory Powers Act, 2000 _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.