mysql_data_seek

(PHP 4, PHP 5)

mysql_data_seekMove internal result pointer

Warning

This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

Description

bool mysql_data_seek ( resource $result , int $row_number )

mysql_data_seek() moves the internal row pointer of the MySQL result associated with the specified result identifier to point to the specified row number. The next call to a MySQL fetch function, such as mysql_fetch_assoc(), would return that row.

row_number starts at 0. The row_number should be a value in the range from 0 to mysql_num_rows() - 1. However if the result set is empty (mysql_num_rows() == 0), a seek to 0 will fail with a E_WARNING and mysql_data_seek() will return FALSE.

Parameters

result

The result resource that is being evaluated. This result comes from a call to mysql_query().

row_number

The desired row number of the new result pointer.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 mysql_data_seek() example

<?php
$link 
mysql_connect('localhost''mysql_user''mysql_password');
if (!
$link) {
    die(
'Could not connect: ' mysql_error());
}
$db_selected mysql_select_db('sample_db');
if (!
$db_selected) {
    die(
'Could not select database: ' mysql_error());
}
$query 'SELECT last_name, first_name FROM friends';
$result mysql_query($query);
if (!
$result) {
    die(
'Query failed: ' mysql_error());
}
/* fetch rows in reverse order */
for ($i mysql_num_rows($result) - 1$i >= 0$i--) {
    if (!
mysql_data_seek($result$i)) {
        echo 
"Cannot seek to row $i: " mysql_error() . "\n";
        continue;
    }

    if (!(
$row mysql_fetch_assoc($result))) {
        continue;
    }

    echo 
$row['last_name'] . ' ' $row['first_name'] . "<br />\n";
}

mysql_free_result($result);
?>

Notes

Note:

The function mysql_data_seek() can be used in conjunction only with mysql_query(), not with mysql_unbuffered_query().

See Also

Коментарии

/*here is a nice function for converting a mysql result row set into a 2d array, a time saver if need small data from several rows, saves you from having to do Alot of queries... would be nice to have this built into PHP future versions :) */

// simple example query
$r=mysql_query("select user,id,ip from accounts limit 10");

//starts the for loop, using mysql_num_rows() to count total
//amount of rows returned by $r
for($i=0; $i<mysql_num_rows($r); $i++){
             //advances the row in the mysql resource $r
    mysql_data_seek($r,$i);
             //assigns the array keys, $users[row][field]
    $users[$i]=mysql_fetch_row($r);
}

//simple, hope someone can use it :)
// -Kenneth Nash
2004-03-26 02:12:05
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html
to kennethnash1134 at yahoo dot com

your loop can be done like this as well and i guess this is faster:

$r=mysql_query("select user,id,ip from accounts limit 10");

unset($users); // Just to be sure
while($users[] = mysql_fetch_row);
array_pop($users); // Drop the last entry which is FALSE
2004-12-09 01:09:35
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html
hello, this script would be easy to understand for those that are novice in php whose want to understand about this function:

the table "user" have 2 columns "id" and "name".
"user" content:
position 0: "id"=195342481 "name"='Arthur'
position 1: "id"=179154675 "name"='John'
>>position 2<<: "id"=157761949 "name"='April' >>third row<<
position 3: "id"=124492684 "name"='Tammy'
position 4: "id"=191346457 "name"='Mike'

<?php
  mysql_connect
("localhost""root")
 
mysql_select_db("test");
 
$sql mysql_query("select * from user");
 
mysql_data_seek($sql2);
  echo 
"<table border=1>";
  while (
$row mysql_fetch_row($sql)){
    echo 
"<tr><td>$row[0]</td><td>$row[1]</td></tr>";
  }
  echo 
"</tabla>";
?>

explanation:
mysql_data_seek move internal result pointer to the third row of table user. Thus mysql_fetch_row will begin by april?s row.
2005-04-20 23:53:47
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html
Автор:
A helpful note about the 'resource' data type.

Since the 'resource' variable is pointing to a row in a result set at any given time, you can think of it as being passed to this function by reference every time you pass it or assign it to a variable.

<?

$sql 
"SELECT * from <table>";
$result mysql_query($sql);
$temp_result $result;

while (
$row mysql_fetch_assoc($temp_result)) {
   
// do stuff with $row
}

while (
$row mysql_fetch_assoc($result)) {
   
// This code will never run because the 'resource' variable is pointing past the end of the result set,
    // even though it was *not* assigned by reference to $result2.
}

?>

Therefore, the following snipits are functionally identical:

<?

// Start snipit 1

$sql "SELECT * from <table>";
$result mysql_query($sql);

while (
$row mysql_fetch_assoc($result)) {
   
// do stuff with $row
}

mysql_data_seek($result0);

while (
$row mysql_fetch_assoc($result)) {
   
// do other stuff with $row
}

// Start snipit 2

$sql "SELECT * from <table>";
$result mysql_query($sql);
$temp_result $result;

while (
$row mysql_fetch_assoc($temp_result)) {
   
// do stuff with $row
}

mysql_data_seek($result0);

while (
$row mysql_fetch_assoc($temp_result)) {
   
// do other stuff with $row
}

?>
2006-05-30 04:52:11
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html
Автор:
Here is a simple function to "peek" at the position of the internal pointer in a query result:

<?php
function mysql_pointer_position($result_set) {
       
$num_rows mysql_num_rows($result_set);
       
$i 0;
        while(
$result mysql_fetch_array($result_set)) {
           
$i++;
        }
       
$pointer_position $num_rows $i;

//Return pointer to original position
       
if($pointer_position <= $num_rows 1) {
           
mysql_data_seek($result_set$pointer_position);
        }
        return 
$pointer_position;
    }
?>
2008-08-28 17:59:19
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html
Here, you can find the current pointer of selected row easily:

<?php
//selected row with id=4
$id    =    "4";

$result    =    mysql_query("select * from jos_components");

$num    =    mysql_num_rows($result);

for(
$i=0;$i<$num;$i++){
   
   
mysql_data_seek($result,$i);
 
   
$row    =    mysql_fetch_assoc($result);
   
    if(
$row['id']    ==    $id){
       
       
$pointer    =    $i;
    }

 
}

// current pointer for selected row
echo $pointer;
?>
2011-11-25 20:30:04
http://php5.kiev.ua/manual/ru/function.mysql-data-seek.html

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