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Re: [0.0] Re: [0.2] getting transactions to work

From: reiner peterke <zedaardv(at)drizzle(dot)com>
To: Rod K <rod(at)23net(dot)net>
Cc: pgsql-php(at)postgresql(dot)org
Subject: Re: [0.0] Re: [0.2] getting transactions to work
Date: 2004-07-30 16:05:06
Message-ID: 39156042-E242-11D8-8EE0-000A95984CA6@drizzle.com (view raw or flat)
Thread:
Lists: pgsql-php
i'm trying to test an idea.  i know what i sent doesn't do much, but i 
try out ideas before i go too far to make sure i understand what i 
think i do
in my 'real life'  i work with oracle.  i like the idea of explicitly 
telling the database when i'm done.  i want to be able to trap errors 
and rollback if necessary.  also to give someone the choice of saving 
the work or not.  i know there are things i can do to create the 
similar effect,
create the sql, then when i'm ready submit it to the database.

i guess i'm trying to test the limits right now!

thanks for the input.

r

On 30 jul 2004, at 17.11, Rod K wrote:

> You can find many resources to explain their purpose better than I can 
> do here.
>
> To be honest, I can't see what you are trying to accomplish in your 
> script.  If it's validation you should be using session variables to 
> store the input AND echoing what was inputed on the validation page.
>
> reiner peterke wrote:
>
>> this is meant in all honesty,
>>
>> then whats the point?!
>>
>> ok, let me put it this way.  is there no way to implement pages using 
>> transactions?
>> otherwise it seems to kind of defeat the purpose of them.
>>
>> r
>> On 30 jul 2004, at 16.57, Rod K wrote:
>>
>>> You are correct.  You cannot have a transaction span multiple 
>>> pages/scripts.
>>>
>>> reiner peterke wrote:
>>>
>>>> there seems to be very little info around on actually using 
>>>> transactions with postgres.  i've tried to create a page that will 
>>>> take input from a form and insert it into my database.  it works if 
>>>> i just do it without transactions but when i try to use with the 
>>>> begin and commit sections of code, it doesn't update the data base. 
>>>>  i'm guessing it is doing a rollback when my page loads itself 
>>>> again.  can anyone help me out here ?
>>>>
>>>> thanks
>>>>
>>>> r
>>>>
>>>> code below
>>>>
>>>> <html>
>>>> <head>
>>>> <submitle>those eyes</submitle>
>>>> </head>
>>>> <body>
>>>>   <?
>>>>   $conn = pg_connect("dbname=entish user=postgres");
>>>>     if(!$conn)
>>>>     {
>>>>       print "not for the chocolate";
>>>>       exit;
>>>>     }
>>>>   if ($_POST[submit])  {
>>>>
>>>>     $begin = pg_query("begin");
>>>>     $isql = "insert into diety(diety,culture,gender)
>>>>               values 
>>>> ('$_POST[diety]','$_POST[culture]','$_POST[gender]')";
>>>>     printf("-- %s --\n",$isql);
>>>>     $results = pg_query($isql);
>>>>     ?>
>>>>     <form method="post" action="<? echo $PHP_SELF?>">
>>>>       <input type="Submit" name="action" value="commit">
>>>>       <input type="Submit" name="action" value="rollback">
>>>>     </form>
>>>>     <?
>>>>   }
>>>>   else if(!$_POST[action]) {
>>>>   ?>
>>>>     <form method="post" action="<? echo $PHP_SELF?>">
>>>>       Diety:<input type="text" name="diety"><br>
>>>>       Culture:<input type="text" name="culture"><br>
>>>>       Gender:<input type="text" name="gender"><br>
>>>>       <input type="Submit" name="submit" value="enter">
>>>>     </form>
>>>>     <?
>>>>   }
>>>>   else {
>>>>     if($_POST[action] == 'commit') {
>>>>       echo "let me see";
>>>>       $act = pg_query("commit");
>>>>     }
>>>>     else {
>>>>       $act = pg_query("rollback");
>>>>       }
>>>>   }  //end if $_POST[submit]
>>>> ?>
>>>> </body>
>>>> </html>
>>>> ---------------------------(end of 
>>>> broadcast)---------------------------
>>>> TIP 8: explain analyze is your friend
>>>
>>>
>>>
>>
>
>
> ---------------------------(end of 
> broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
>               http://www.postgresql.org/docs/faqs/FAQ.html
>


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