want tables to start at zero rows using php

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28328838.html

I like the solution but if I create many empty tables in my new database, the auto_increment primary key will start at a high number (254 in this example).
I want to start at 0 or 1 whichever is the normal start of table

so my question is how to remove
AUTO_INCREMENT=254
   (will this change the table)
or
AUTO_INCREMENT=0 or 1

CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL auto_increment, `conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM AUTO_INCREMENT=254 DEFAULT CHARSET=utf8;

Open in new window

LVL 1
rgb192Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

gr8gonzoConsultantCommented:
Try out HeidiSQL. Its a good Gui for mysql that will also show you the commands being run. So you can set the auto incrementing ID and see the commands.
Dave BaldwinFixer of ProblemsCommented:
AUTO_INCREMENT will find the highest number in that column and add 1 to it.  You can set it to whatever you want but that's what it's going to do.  AUTO_INCREMENT=254 in a CREATE statement is basically telling you what the next number is going to be.  You can remove that entirely and it will work the way I described.
Ray PaseurCommented:
Building on the earlier question, this shows how to remove the AUTO_INCREMENT argument.
<?php // RAY_temp_rgb192.php
error_reporting(E_ALL);

// SEE http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28330417.html
// AND http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28328838.html

// TEST DATA
$sql = <<<EOD
CREATE TABLE `a_images` (
  `a_images_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=utf8;


insert into table
...

...


CREATE TABLE `a_images2` (
  `a_images_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=utf8;


insert
...
...
...

CREATE TABLE `a_images3` (
  `a_images_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=utf8;
EOD;

// ISOLATE THE CREATE TABLE STATEMENTS
preg_match_all("/CREATE TABLE [^;]+;/", $sql, $mat);
$new = implode(PHP_EOL, $mat[0]);

// REMOVE THE AUTO_INCREMENT
$new = preg_replace('/AUTO_INCREMENT.*?\s/i', NULL, $new);
var_dump($new);

Open in new window

Rowby Goren Makes an Impact on Screen and Online

Learn about longtime user Rowby Goren and his great contributions to the site. We explore his method for posing questions that are likely to yield a solution, and take a look at how his career transformed from a Hollywood writer to a website entrepreneur.

rgb192Author Commented:
<?php
$sql = file_get_contents("C:/Users/Acer/Documents/dumps/storage-creates.sql");

// ISOLATE THE CREATE TABLE STATEMENTS
preg_match_all("/CREATE TABLE [^;]+;/", $sql, $mat);
$new = implode(PHP_EOL, $mat[0]);

// REMOVE THE AUTO_INCREMENT
$new = preg_replace('/AUTO_INCREMENT.*?\s/i', NULL, $new);
//var_dump($new);

foreach($new[0] as $query)
{
  echo $query . "<br><br>";
}

Open in new window


Warning: Invalid argument supplied for foreach() in C:\wamp\www\test\readingsql4.php on line 12

HeidiSQL might solve another mysql based question, but this is a php zone question.
Dave I am looking to have php remove this line.
Ray PaseurCommented:
Please use var_dump($new) to see what that variable contains.  I see you commented it out, but you really need to get used to using var_dump().  It will save you a lot of time!

Here is the man page: foreach() works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable.

Going forward, you might want to post your questions in more than one Zone.  You can have up to three Zones.  When the question deals with PHP and MySQL, posting in both Zones makes a lot of sense.

Wishing you a good New Year 2014, ~Ray
rgb192Author Commented:
string(778) "CREATE TABLE `a_images` ( `a_images_id` int(11) NOT NULL `profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `image_url` varchar(200) default NULL, PRIMARY KEY (`a_images_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL `conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;"
Warning: Invalid argument supplied for foreach() in C:\wamp\www\test\readingsql4.php on line 12
gr8gonzoConsultantCommented:
It's because $new isn't an array, it's a string because you used implode() to convert the array to a string.

Try this if you want to keep the data in an array:

<?php
$sql = file_get_contents("C:/Users/Acer/Documents/dumps/storage-creates.sql");

// ISOLATE THE CREATE TABLE STATEMENTS
preg_match_all("/CREATE TABLE [^;]+;/", $sql, $mat);
$new = $mat[0];
// $new = implode(PHP_EOL, $mat[0]);

// REMOVE THE AUTO_INCREMENT
foreach($new as $idx => $sql)
{
  $new[$idx] = preg_replace('/AUTO_INCREMENT.*?\s/i', NULL, $sql);
}

foreach($new[0] as $query)
{
  echo $query . "<br><br>";
}

Open in new window


Let me note something - it doesn't matter how many tables you create. Each table has its own auto-incrementing value (if you use an auto-incrementing primary key). If you saw auto-incrementing values above 0, then it's usually because you did a mysqldump of a table that already had some records in it.

I mentioned HeidiSQL because you had already created the tables and it sounded like you wanted to reset the auto-increment values for each table, but if you're going to drop and recreate the tables, then this approach will work, too.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
rgb192Author Commented:
I added:
ini_set('display_errors', TRUE);
but got no additional information from that line.

<?php
ini_set('display_errors', TRUE);
$sql = file_get_contents("C:/Users/Acer/Documents/dumps/storage-creates.sql");

// ISOLATE THE CREATE TABLE STATEMENTS
preg_match_all("/CREATE TABLE [^;]+;/", $sql, $mat);
$new = $mat[0];
// $new = implode(PHP_EOL, $mat[0]);

// REMOVE THE AUTO_INCREMENT
foreach($new as $idx => $sql)
{
  $new[$idx] = preg_replace('/AUTO_INCREMENT.*?\s/i', NULL, $sql);
}

foreach($new[0] as $query)
{
  echo $query . "<br><br>";
}

Open in new window



only output is a warning:
Warning: Invalid argument supplied for foreach() in C:\wamp\www\test\readingsql5.php on line 16
Ray PaseurCommented:
I think I would start the debugging process by looking at the contents of the file that gets read into $sql.  Does it make sense?  Next I would look at the contents of $mat.  If those variables appear correct, I would then look at $new.  You can inspect these variables with var_dump().
rgb192Author Commented:
<?php
ini_set('display_errors', TRUE);
$sql = file_get_contents("C:/Users/Acer/Documents/dumps/storage-creates.sql");

// ISOLATE THE CREATE TABLE STATEMENTS
preg_match_all("/CREATE TABLE [^;]+;/", $sql, $mat);
$new = $mat[0];
// $new = implode(PHP_EOL, $mat[0]);

// REMOVE THE AUTO_INCREMENT
foreach($new as $idx => $sql)
{
  $new[$idx] = preg_replace('/AUTO_INCREMENT.*?\s/i', NULL, $sql);
}

foreach($new[0] as $query)
{
  echo $query . "<br><br>";
}
echo '<pre>';
echo '<br>sql<br>-------------------<br><br>';
var_dump($sql);
echo '<br>mat<br>-------------------<br><br>';
var_dump($mat);
echo '<br>new<br>-------------------<br><br>';
var_dump($new);
echo '</pre>';

Open in new window



output
Warning: Invalid argument supplied for foreach() in C:\wamp\www\test\readingsql6.php on line 16

sql-------------------string(554) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL auto_increment,
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM AUTO_INCREMENT=254 DEFAULT CHARSET=utf8;"
mat-------------------array(1) {
  [0]=>
  array(2) {
    [0]=>
    string(291) "CREATE TABLE `a_images` (
  `a_images_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=utf8;"
    [1]=>
    string(554) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL auto_increment,
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM AUTO_INCREMENT=254 DEFAULT CHARSET=utf8;"
  }
}
new-------------------array(2) {
  [0]=>
  string(257) "CREATE TABLE `a_images` (
  `a_images_id` int(11) NOT NULL 
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;"
  [1]=>
  string(519) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL 
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;"
}

Open in new window

Ray PaseurCommented:
$new is an array, and $new[0] is a string, so the foreach() iterator does not make sense as written on line 16.  Try this for line 16:

foreach($new as $query)
rgb192Author Commented:
CREATE TABLE `a_images` ( `a_images_id` int(11) NOT NULL `profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `image_url` varchar(200) default NULL, PRIMARY KEY (`a_images_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL `conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;


sql-------------------string(554) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL auto_increment,
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM AUTO_INCREMENT=254 DEFAULT CHARSET=utf8;"
mat-------------------array(1) {
  [0]=>
  array(2) {
    [0]=>
    string(291) "CREATE TABLE `a_images` (
  `a_images_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=utf8;"
    [1]=>
    string(554) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL auto_increment,
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM AUTO_INCREMENT=254 DEFAULT CHARSET=utf8;"
  }
}
new-------------------array(2) {
  [0]=>
  string(257) "CREATE TABLE `a_images` (
  `a_images_id` int(11) NOT NULL 
  `profile_id` varchar(20) default NULL,
  `image_name` varchar(100) default NULL,
  `image_url` varchar(200) default NULL,
  PRIMARY KEY  (`a_images_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;"
  [1]=>
  string(519) "CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL 
  `conversation_id` bigint(20) default NULL,
  `profile_id` varchar(20) default NULL,
  `sender` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `message_text` varchar(1000) default NULL,
  `dateAgo` datetime default NULL,
  `message_read` tinyint(4) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;"
}

Open in new window




output
CREATE TABLE `a_images` ( `a_images_id` int(11) NOT NULL `profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `image_url` varchar(200) default NULL, PRIMARY KEY (`a_images_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL `conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

Open in new window


desired output
CREATE TABLE `a_images` ( `a_images_id` int(11) NOT NULL  auto_increment, `profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `image_url` varchar(200) default NULL, PRIMARY KEY (`a_images_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL  auto_increment,`conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

Open in new window



Your code deletes the first
 auto_increment,
in every create query
Ray PaseurCommented:
so my question is how to remove
AUTO_INCREMENT=254
   (will this change the table)
or
AUTO_INCREMENT=0 or 1
And that is why we showed you how to remove the AUTO_INCREMENT
rgb192Author Commented:
Okay I will have another question on how to remove only the auto increment at the bottom of query.

Thanks
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
PHP

From novice to tech pro — start learning today.