[PHP-DB] mysql lock
Hi, I've never used a lock on a MySQL table so far, but need one now. Two questions: 1. Do I set the lock by a normal query, but in the form of LOCK TABLE tablename WRITE, instead of SELECT * FROM tablename WHERE x = 1? 2. Can I set the lock in one query, then perform multiple other queries on the table, in between which I do some PHP work, and then release the lock several queries and lines of PHP code later? -- anders thoresson -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] generating sequence without AUTO_INCREMENT
Doing what I wanted to do took six hours and 120 lines of code, all in all, but I learnt a good deal on the way. ;-) At times, manual intervention can be a lifesaver. You have already said that you have to 'ring fence' bank holidays, and weekends, so someone has to check or enter the bank holidays. So I would provide two 'fill' functions that populates an issue number table, and will either fill the week if no bank holidays, or fill each selected day when there is a bank holiday in the week. This can then be done monthly or yearly as the look ahead time requires. Or am I missing something - I've only ever used Interbase/Firebird, and never had a problem with this sort of ident. -- Lester Caine - L.S.Caine Electronic Services -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] error checking question
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 26 June 2003 20:22 What I would like to do is somehow have a redundant error check on the server side and then display an error message above the form on the main page should fields be left blank or forbidden characters entered. Since I have access to the $_POST['variables'] on the form processing page, I've already written some code to detect the presence of error characters, etc...and no query is performed if there is an error. But how do I pass a flag variable back to the main page to echo an appropriate message above the form? One simple way: header(Location: http:/your.server.name/path/to/main_page.php?err=$errcode); exit(); And then emit an error in main_page.php if $_GET['err'] is set. If you're using sessions, another way would be to set an error variable in the session. Cheers! Mike - Mike Ford, Electronic Information Services Adviser, Learning Support Services, Learning Information Services, JG125, James Graham Building, Leeds Metropolitan University, Beckett Park, LEEDS, LS6 3QS, United Kingdom Email: [EMAIL PROTECTED] Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] latest version of php only cgi?
-Original Message- From: Doug Finch [mailto:[EMAIL PROTECTED] Sent: 26 June 2003 21:12 Is the newest version of php 4 only available as a cgi-based program? DF No. Cheers! Mike - Mike Ford, Electronic Information Services Adviser, Learning Support Services, Learning Information Services, JG125, James Graham Building, Leeds Metropolitan University, Beckett Park, LEEDS, LS6 3QS, United Kingdom Email: [EMAIL PROTECTED] Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Re: php-db Digest 25 Jun 2003 15:10:42 -0000 Issue 1899
From: Jason Wong [EMAIL PROTECTED] To: [EMAIL PROTECTED] Date: Wed, 25 Jun 2003 04:03:53 +0800 Subject: Re: [PHP-DB] md5 question! Plain Text Attachment [ Save to my Yahoo! Briefcase | Download File ] On Tuesday 24 June 2003 22:36, Peter Beckman wrote: Most sites save/allow an 8 character password. Allowing alphanumerics and underscore, period and pound (_, ., #), that is 39^8, or 5,352,009,260,481 or about 5 trillion possible passwords. If you allow more than 8 characters, that number increases. If you're using md5 then there is no inherent restriction on what characters and number of characters that can be used in the password. The limitations are in the user, they'll probably use their phone number, DOB, dog's name -- anything that's easy to remember ;-) Hi, Okay with the followup above is there a way to handle a database table that will only allow certain characters for a password? (e.g. Only letters and numbers and not _';:)(*^%$# etc...) I guess a easy managment way to do it is either via the PHP code or via JavaScript. Maybe more professional would be in the PHP code. Maybe the 'if' statement would be ideal? Any suggestions? Also while on php talk how do I make a java popup message appear in a PHP code? Is there a way to do this, alert? There are many ways to do it im Javascript but was wondering if PHP had a way to do it in the PHP code itself. (hidden away if possible) Jerry http://mobile.yahoo.com.au - Yahoo! Mobile - Check compose your email via SMS on your Telstra or Vodafone mobile. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
If you're trying to do paging, it's quite simple (there are tons of examples
out there, search google for paging php)
$sql = select count(*) from table_name
$number_of_records = mysql_query($sql);
$pointer=0;
$recs_per_page=20;
if($number_of_records $recs_per_page) {
// do a limit and keep the pointer
$sql = select * from other_table limit $pointer,$recs_per_page;
$pointer += $recs_per_page;
This isn't complete by any means but the point should be clear. You limit
the query by LIMIT starting_point,number_of_records_to_return at the end
of the sql statement.
Don't worry about the values in the column, just the amount of records you
want to return
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 26, 2003 10:25 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Greetings all, I'm not sure if this has been discussed
recently, I've read
bits and pieces and I can't remember where I read everything
so if it has
been brought up recently - sorry.
If I do an SQL (MySQL) query on the first example to get the
min and max IDs
then I will get 1 and 6 respectively. I will then be able to
loop from 1 to
6 and return all 6 products from the database. If however I
wanted to split
this in to two pages with 3 items in each page then using the
first example
below I could grab the min ID and add 2 to it to make 3. I
could not do
this using the second example because if I grab the min ID I
would get 3, if
I add 2 to it then I would get 5. 5 does not exit in this
table so that
wouldn't work. How in example 2 would I be able to split
this over two
pages?
//example 1
ID Product_Name
1 Hoover
2 Kettle
3 Fridge
4 Cooker
5 Food Mixer
6 TV
//example 2
ID Product_Name
3 Fridge
4 Cooker
7 Microwave Oven
8 Freezer
9 DVD Player
10 Computer
Any ideas?
Anything is much appreciated.
Graeme :)
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Gary, thanks for your reply, I think I'll need 2 have a think about this. I
didn't totally understand:
You limit
the query by LIMIT starting_point,number_of_records_to_return at the end
of the sql statement.
I've never used LIMIT before, could you explain this a bit more or point me
to some info?
Cheers,
Graeme :)
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Friday, June 27, 2003 2:39 PM
Subject: RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
If you're trying to do paging, it's quite simple (there are tons of
examples
out there, search google for paging php)
$sql = select count(*) from table_name
$number_of_records = mysql_query($sql);
$pointer=0;
$recs_per_page=20;
if($number_of_records $recs_per_page) {
// do a limit and keep the pointer
$sql = select * from other_table limit $pointer,$recs_per_page;
$pointer += $recs_per_page;
This isn't complete by any means but the point should be clear. You limit
the query by LIMIT starting_point,number_of_records_to_return at the end
of the sql statement.
Don't worry about the values in the column, just the amount of records you
want to return
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 26, 2003 10:25 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Greetings all, I'm not sure if this has been discussed
recently, I've read
bits and pieces and I can't remember where I read everything
so if it has
been brought up recently - sorry.
If I do an SQL (MySQL) query on the first example to get the
min and max IDs
then I will get 1 and 6 respectively. I will then be able to
loop from 1 to
6 and return all 6 products from the database. If however I
wanted to split
this in to two pages with 3 items in each page then using the
first example
below I could grab the min ID and add 2 to it to make 3. I
could not do
this using the second example because if I grab the min ID I
would get 3, if
I add 2 to it then I would get 5. 5 does not exit in this
table so that
wouldn't work. How in example 2 would I be able to split
this over two
pages?
//example 1
ID Product_Name
1 Hoover
2 Kettle
3 Fridge
4 Cooker
5 Food Mixer
6 TV
//example 2
ID Product_Name
3 Fridge
4 Cooker
7 Microwave Oven
8 Freezer
9 DVD Player
10 Computer
Any ideas?
Anything is much appreciated.
Graeme :)
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] re:[PHP-DB] Splitting Product catalog
Graeme,
Use a select string as in,
$sel=select * from product where price100 order by price LIMIT 0,100;
This would result in the query only returning the first 100 records. If you
want to page through them (back and next links). You would have to save the
current start point and the length would be the number of records you want
to display. Take the following example (please) which selected records in
groups of tens:
session_start();
$start=$_SESSION['start'];
sel=select count(*) from product;
$res=mysql_query($sel) or die(mysql_error());
$r=mysql_fetch_array($res);
$totalmsg=$r[0];
if ($start$totalmsg) {
$start=0;
$_SESSION['start']=0;
}
$res=mysql_query($sel) or die(mysql_error);
$numtoprocess=10;
$numselected=mysql_num_rows($res);
if ($numselected$numtoprocess) {
$numtoprocess=$numselected;
}
$sel=select * from product limit $start,$numtoprocess;
for ($i=0;$i$numtoprocess;$i++) {
process the record here
}
$start+=$i;
$_SESSION['start']=$start;
yada, yada, yada (put your back and next buttons here)
The above code is stripped of most error checking etc., but it should give
you a framework to get started.
Michael Lewis
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
LIMIT 0,10 will return the first ten records of a result set. To make more
sense, you should do an ORDER BY of some field to get the info sorted
correctly.
LIMIT takes 1 or two arguments
If there is only one argument, say 10, it will return the first ten records.
If there are two arguments, LIMIT 20,10 it will return 10 records starting
at record 20.
More info at
http://www.mysql.com/doc/en/SELECT.html
Search for limit on that page.
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Friday, June 27, 2003 9:20 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Gary, thanks for your reply, I think I'll need 2 have a think
about this. I
didn't totally understand:
You limit
the query by LIMIT
starting_point,number_of_records_to_return at the end
of the sql statement.
I've never used LIMIT before, could you explain this a bit
more or point me
to some info?
Cheers,
Graeme :)
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Friday, June 27, 2003 2:39 PM
Subject: RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
If you're trying to do paging, it's quite simple (there are tons of
examples
out there, search google for paging php)
$sql = select count(*) from table_name
$number_of_records = mysql_query($sql);
$pointer=0;
$recs_per_page=20;
if($number_of_records $recs_per_page) {
// do a limit and keep the pointer
$sql = select * from other_table limit $pointer,$recs_per_page;
$pointer += $recs_per_page;
This isn't complete by any means but the point should be
clear. You limit
the query by LIMIT
starting_point,number_of_records_to_return at the end
of the sql statement.
Don't worry about the values in the column, just the amount
of records you
want to return
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 26, 2003 10:25 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Greetings all, I'm not sure if this has been discussed
recently, I've read
bits and pieces and I can't remember where I read everything
so if it has
been brought up recently - sorry.
If I do an SQL (MySQL) query on the first example to get the
min and max IDs
then I will get 1 and 6 respectively. I will then be able to
loop from 1 to
6 and return all 6 products from the database. If however I
wanted to split
this in to two pages with 3 items in each page then using the
first example
below I could grab the min ID and add 2 to it to make 3. I
could not do
this using the second example because if I grab the min ID I
would get 3, if
I add 2 to it then I would get 5. 5 does not exit in this
table so that
wouldn't work. How in example 2 would I be able to split
this over two
pages?
//example 1
ID Product_Name
1 Hoover
2 Kettle
3 Fridge
4 Cooker
5 Food Mixer
6 TV
//example 2
ID Product_Name
3 Fridge
4 Cooker
7 Microwave Oven
8 Freezer
9 DVD Player
10 Computer
Any ideas?
Anything is much appreciated.
Graeme :)
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] re:[PHP-DB] Splitting Product catalog
Michael, thank you so much for that code. I think I could maybe get this
working properly. I've got 2 categories and 4 products in each and I want
to split them in to 2 pages, 2 products on each. So obviously I will have 2
links at the bottom page 1 2.. etc when I click the link 2 I will
need 2 tell the database to look up the 3rd and 4th record. So would it be
possible to pass a parameter in the URL such as newpage=2 then multiply
it by 2 and use that as the maximum limit then take 1 away from that value
and use that as the minimum limit in the SQL query?
Basically:
2x2 = 4 (maximum limit)
4-1 = 3 (minimum limit)
Would this work?
Cheers,
Graeme :)
- Original Message -
From: Michael Lewis [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 27, 2003 3:47 PM
Subject: [PHP-DB] re:[PHP-DB] Splitting Product catalog
Graeme,
Use a select string as in,
$sel=select * from product where price100 order by price LIMIT
0,100;
This would result in the query only returning the first 100 records. If
you
want to page through them (back and next links). You would have to save
the
current start point and the length would be the number of records you want
to display. Take the following example (please) which selected records in
groups of tens:
session_start();
$start=$_SESSION['start'];
sel=select count(*) from product;
$res=mysql_query($sel) or die(mysql_error());
$r=mysql_fetch_array($res);
$totalmsg=$r[0];
if ($start$totalmsg) {
$start=0;
$_SESSION['start']=0;
}
$res=mysql_query($sel) or die(mysql_error);
$numtoprocess=10;
$numselected=mysql_num_rows($res);
if ($numselected$numtoprocess) {
$numtoprocess=$numselected;
}
$sel=select * from product limit $start,$numtoprocess;
for ($i=0;$i$numtoprocess;$i++) {
process the record here
}
$start+=$i;
$_SESSION['start']=$start;
yada, yada, yada (put your back and next buttons here)
The above code is stripped of most error checking etc., but it should give
you a framework to get started.
Michael Lewis
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?Ahhh rite, I think I get
this, I've just posted another question but I think I it will work if I do it the way
I suggest in my last post. If not please let me know.
Thank you both Gary and Michael!
Cheers,
Graeme :)
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED]
Sent: Friday, June 27, 2003 3:44 PM
Subject: RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
LIMIT 0,10 will return the first ten records of a result set. To make more sense,
you should do an ORDER BY of some field to get the info sorted correctly.
LIMIT takes 1 or two arguments
If there is only one argument, say 10, it will return the first ten records. If
there are two arguments, LIMIT 20,10 it will return 10 records starting at record 20.
More info at
http://www.mysql.com/doc/en/SELECT.html
Search for limit on that page.
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Friday, June 27, 2003 9:20 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Gary, thanks for your reply, I think I'll need 2 have a think
about this. I
didn't totally understand:
You limit
the query by LIMIT
starting_point,number_of_records_to_return at the end
of the sql statement.
I've never used LIMIT before, could you explain this a bit
more or point me
to some info?
Cheers,
Graeme :)
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Friday, June 27, 2003 2:39 PM
Subject: RE: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
If you're trying to do paging, it's quite simple (there are tons of
examples
out there, search google for paging php)
$sql = select count(*) from table_name
$number_of_records = mysql_query($sql);
$pointer=0;
$recs_per_page=20;
if($number_of_records $recs_per_page) {
// do a limit and keep the pointer
$sql = select * from other_table limit $pointer,$recs_per_page;
$pointer += $recs_per_page;
This isn't complete by any means but the point should be
clear. You limit
the query by LIMIT
starting_point,number_of_records_to_return at the end
of the sql statement.
Don't worry about the values in the column, just the amount
of records you
want to return
Gary Every
Sr. UNIX Administrator
Ingram Entertainment
(615) 287-4876
Pay It Forward
mailto:[EMAIL PROTECTED]
http://accessingram.com
-Original Message-
From: Boa Constructor [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 26, 2003 10:25 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DB] Splitting Product Catalogue Over Multiple Pages?
Greetings all, I'm not sure if this has been discussed
recently, I've read
bits and pieces and I can't remember where I read everything
so if it has
been brought up recently - sorry.
If I do an SQL (MySQL) query on the first example to get the
min and max IDs
then I will get 1 and 6 respectively. I will then be able to
loop from 1 to
6 and return all 6 products from the database. If however I
wanted to split
this in to two pages with 3 items in each page then using the
first example
below I could grab the min ID and add 2 to it to make 3. I
could not do
this using the second example because if I grab the min ID I
would get 3, if
I add 2 to it then I would get 5. 5 does not exit in this
table so that
wouldn't work. How in example 2 would I be able to split
this over two
pages?
//example 1
ID Product_Name
1 Hoover
2 Kettle
3 Fridge
4 Cooker
5 Food Mixer
6 TV
//example 2
ID Product_Name
3 Fridge
4 Cooker
7 Microwave Oven
8 Freezer
9 DVD Player
10 Computer
Any ideas?
Anything is much appreciated.
Graeme :)
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] redirection checking
I am compiling latest PHP4 and get a warning telling me that I am about to compile without redirection checking. Should I be concerned about this? If so, what flag should I use in the config to alleviate this? DF -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Re: Efficiency question
Peter and Hugh, The queries are already mostly optimized. I just was using that one as an example. I'll be going through them and tweaking them, but know that about the variable assignments helps for sure. Thanks! On Thu June 26 2003 10:49 pm, Peter Beckman wrote: Since this is the PHP DB list, I can tell you this -- you would be better off performance-wise replacing the * in select * from and replacing it with a list of the columns (even if it is all of them) than you would putting all of that on one line. $r = rand(0,7)*-1; $s = abs($r); is as fast as (maybe a few CPU cycles, but when you're talking 2GHz processor, eh) $s = abs(rand(0,7)*-1); The second is probably more elegant, but then again, you still have to check to see what $data contains -- the DB might not have returned a row (for some unknown reason). Optimize DB calls before compacting variables. I'm all about writing compact optimized code, but your DB calls and DB layout (indexes and queries mostly, but also table design) cost the most performance-wise and you're better off spending time getting them better. I highly recommend: http://www.mysql.com/documentation/mysql/bychapter/manual_MySQL_Optimisatio n.html#Estimating_performance Peter On Thu, 26 Jun 2003, Hugh Bothwell wrote: Micah Stevens [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] $data = mysql_fetch_assoc(mysql_query(select * from some_table limit 1)); would be faster than: $pointer = mysql_query(select * from some_table limit 1); $data = mysql_fetch_assoc($pointer); but I'm not sure, php may optimize this. Anyone know the answer? It will be faster by one store and one fetch... the database query probably takes 1000 times as long. I don't think the difference is worth the time you'd take to change it. -- Hugh Bothwell [EMAIL PROTECTED] Kingston ON Canada v3.1 GCS/E/AT d- s+: a- C+++ L+$ P+ E- W+++$ N++ K? w++ M PS+ PE++ Y+ PGP+ t-- 5++ !X R+ tv b DI+++ D-(++) G+ e(++) h-- r- y+ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php --- Peter Beckman Internet Guy [EMAIL PROTECTED] http://www.purplecow.com/ --- -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Altering a column in an existing table
I have a column (ID) that is currently not auto_incremental. I need to change it so that it is auto_incremental. There are already records in this column. also, I need to change the field type from int(4) to int(8). Rick
Re: [PHP-DB] Altering a column in an existing table
Rick Dahl wrote: I have a column (ID) that is currently not auto_incremental. I need to change it so that it is auto_incremental. There are already records in this column. also, I need to change the field type from int(4) to int(8). Rick 1) This has nothing to do with PHP. 2) This will most likely require an ALTER query. 3) Read your DB's manual. -- The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
