php records navigation - php

Question

<?php
$host='localhost';
$user='root';
$password='root';
$database='database';
$startindex=#$_REQUEST['seek'];
$db=mysql_connect($host, $user, $password)
or die ("Impossibile connettersi al server $host");
mysql_select_db($database, $db)
or die ("Impossibile connettersi al database $database");
$query="SELECT * FROM ordini_master";
$dbResult=mysql_query($query, $db);
$AffectedRows=mysql_affected_rows($db);
mysql_data_seek($dbResult, $startindex);
$row=mysql_fetch_row($dbResult);
foreach($row as $k=>$v)
{
$myfield=mysql_fetch_field($dbResult, $k);
print($myfield->name . " : $v <br/>");
}
mysql_free_result($dbResult);
mysql_close($db);
print("<br/>Seleziona il record<br/>");
for($index=0; $index<$AffectedRows; $index++)
{
print("<a href=\"{$_SERVER['PHP_SELF']}?seek=$index\" >" .
($index+1) . "</a> ");
}
?>
This code allow the navigation between a query records, so it create a page foreach record in database and so shows one record time. How can i modify that code to paging every 10 records? So i want to show 10 records time and create a page for the next.
Sorry for my english (I'm italian) , i hope you can help me.

Answer 1

What you need first is the LIMIT statement from mysql. MySql states:
The LIMIT clause can be used to constrain the number of rows returned
by the SELECT statement. LIMIT takes one or two numeric arguments,
which must both be nonnegative integer constants (except when using
prepared statements).
With two arguments, the first argument specifies the offset of the
first row to return, and the second specifies the maximum number of
rows to return. The offset of the initial row is 0 (not 1):
As for how to implement it in your code I could not have written a better answer as the one found here.

Answer 2

Use LIMIT to get as many records as you wish.
Example:
SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15
Here is your modified code. This should work for your.
I haven't tested it but give it a try:
<?php
$host='localhost';
$user='root';
$password='root';
$database='database';
$startindex=(isset($_REQUEST['seek']) ? $_REQUEST['seek'] : 0);
$db=mysql_connect($host, $user, $password)
or die ("Impossibile connettersi al server $host");
mysql_select_db($database, $db)
or die ("Impossibile connettersi al database $database");
$queryCnt = "SELECT count(*) as cnt FROM ordini_master";
$CntRow=mysql_fetch_row(mysql_query($query, $db));
$CntData = $CntRow[0];
$step = 10;
$query="SELECT * FROM ordini_master LIMIT $startindex, $step";
$result=mysql_query($query, $db);
while ($row = mysql_fetch_assoc($result)) {
foreach($row as $k=>$v) {
$myfield=mysql_fetch_field($result, $k);
print($myfield->name . " : $v <br/>");
}
}
mysql_free_result($result);
mysql_close($db);
print("<br/>Seleziona il record<br/>");
for($index=0; $index<$CntData; $index=$index+$step) {
print("<a href=\"{$_SERVER['PHP_SELF']}?seek=$index\" >" .
($index+1) . "</a> ");
}
Use the information from tadman too.
It's very important to do something to prevent SQL injection and it's also necessary to use PDO or the mysqli extension because the mysql extension will not longer be supported.

Answer 3

You can use COUNT to display your records and create pages
function getLimitData($start,$limit){
//getting all items
$db = new PDO('mysql:host=localhost; dbname=data','root','');
$results = $db->query("SELECT * FROM table ORDER BY ID DESC limit $start,$limit");
$results = $results->fetchAll(PDO::FETCH_ASSOC);
return $results;
}
//database connection
$db = new PDO('mysql:host=localhost; dbname=data','root','');
//pagination pages
$nav_counter = basename($_SERVER['SCRIPT_FILENAME']);
$page_counter = $nav_counter;
$nav_counter = rtrim($nav_counter, ".php");
$cPage = $page_counter + 1;
//creating next pages
$first_next = $nav_counter + 1 ;
$sec_next = $first_next + 1 ;
$third_next = $sec_next + 1 ;
$fourth_next = $third_next + 1 ;
$fifth_next = $fourth_next + 1 ;
$sixth_next = $fifth_next + 1 ;
$seventh_next = $sixth_next + 1 ;
$next_page = $seventh_next + 1;
//creating previous pages
$first_prev = $nav_counter - 1 ;
$sec_prev = $nav_counter - 2 ;
$third_prev = $nav_counter - 3 ;
$fourth_prev = $nav_counter - 4 ;
$fifth_prev = $nav_counter - 5 ;
$sixth_prev = $nav_counter - 6 ;
$seventh_prev = $nav_counter - 7 ;
//row count
$tableExists = $db->tableExist();
$ROW_COUNT = $db->getRowCount();
$numRows= 9; //number of items to be displayed
//last page
//last page
$last_page = ($ROW_COUNT / $numRows) - 1;
if(!is_int($last_page)){
$last_page = (int)$last_page + 1;
}
$pageNate = '';
if($ROW_COUNT <= $numRows){
$pageNate = 'class="hide"';
}else{
$pageNate = 'class="exist"';
}
//displaying torrents
$start = 0;
$limit = $numRows;
if ($page_counter !== 'index.php') {
$start = ($limit * $nav_counter);
}
//getting number of rows left in the table
$rows_left = $db->getLimitData($start, $limit);
$number_rows = 0;
foreach ($rows_left as $r) {
$number_rows = $number_rows + 1;
}
if ($number_rows < $numRows) {
$limit = $number_rows;
}
$items = $db->getLimitData($start, $limit);
?>
displaying item
<ol>
<?php foreach($items as $item) : ?>
<li><php echo $item['Value']; ?></li>
<?php endforeach; ?>
</ol>
pagination code
<?php
$pages = array();
for ($counter = 1; $counter <= $last_page; $counter++) {
$pages[] = $counter;
}
//storing pages in array and creating a page if it doesn't exist
foreach ($pages as $key) {
$page = $key.'.php';
//if page doesn't exists create page
if(file_exists($page)== false && $key <= $last_page){
copy('index.php', $page);
}
}
?>
<p class="pagenav" >
<a href="index.php" <?php if ($page_counter == 'index.php') {echo 'class="hide"';} ?>><<</a>
<a href="<?php if ($page_counter == '1.php') {echo 'index.php';}else{echo "$first_prev".".php";} ?>" <?php if ($page_counter == 'index.php') {echo 'class="hide"';} ?>><</a>
<a href="<?php echo "$seventh_prev".".php"; ?>" <?php if($seventh_prev <= 0){echo 'class="hide"';} ?>><?php echo $seventh_prev;?></a>
<a href="<?php echo "$sixth_prev".".php"; ?>" <?php if($sixth_prev <= 0){echo 'class="hide"';} ?>><?php echo $sixth_prev;?></a>
<a href="<?php echo "$fifth_prev".".php"; ?>" <?php if($fifth_prev <= 0){echo 'class="hide"';} ?>><?php echo $fifth_prev;?></a>
<a href="<?php echo "$fourth_prev".".php"; ?>" <?php if($fourth_prev <= 0){echo 'class="hide"';} ?>><?php echo $fourth_prev;?></a>
<a href="<?php echo "$third_prev".".php"; ?>" <?php if($third_prev <= 0){echo 'class="hide"';} ?>><?php echo $third_prev;?></a>
<a href="<?php echo "$sec_prev".".php"; ?>" <?php if($sec_prev <= 0){echo 'class="hide"';} ?>><?php echo $sec_prev;?></a>
<a href="<?php echo "$first_prev".".php"; ?>" <?php if($first_prev <= 0 ){echo 'class="hide"';} ?>><?php echo $first_prev;?></a>
<a <?php if ($page_counter == 'index.php') {echo 'class="hide"';}else{ echo 'id="here"';} ?>><?php echo $nav_counter; ?></a>
<a href="<?php echo $first_next.'.php'; ?>" <?php if($first_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $first_next;?></a>
<a href="<?php echo "$sec_next".".php"; ?>" <?php if($sec_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $sec_next;?></a>
<a href="<?php echo "$third_next".".php"; ?>" <?php if($third_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $third_next;?></a>
<a href="<?php echo "$fourth_next".".php"; ?>" <?php if($fourth_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $fourth_next;?></a>
<a href="<?php echo "$fifth_next".".php"; ?>" <?php if($fifth_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $fifth_next;?></a>
<a href="<?php echo "$sixth_next".".php"; ?>" <?php if($sixth_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $sixth_next;?></a>
<a href="<?php echo "$seventh_next".".php"; ?>" <?php if($seventh_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>><?php echo $seventh_next;?></a>
<a href="<?php echo "$first_next".".php"; ?>" <?php if($first_next <= $last_page){echo 'class="exist"';}else{echo 'class="hide"';} ?>>></a>
<a href="<?php echo $last_page.'.php'; ?>" <?php if($nav_counter == $last_page){echo 'class="hide"';}else{echo 'class="exist"';} ?>>>></a>
</p>