PHP MySQLi Limit Data

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PHP Tutorial � PHP MySQLi Limit Data

MySQL database provides a LIMIT clause which is used to specify the number of records displayed (returned).

This feature that PHP has is very useful for optimizing the page load time when we have a very large number of records in DataBase, as well as to improve the readability of a website.

For example, when we have a very large number of entries in the DataBase, it can be divided into several pages using pagination, where a limited number of entries will be uploaded on each page when a user requests that page by clicking on the pagination link.

Syntax:

SELECT * FROM table_name LIMIT value;

PHP MySQL Limit Data - MySQLi (object oriented)

Suppose we want to select all records from 1 to 25 (inclusive) from table "Users". The SQL query will look like this:

Example (this is HTML - PHP editor, change text on this window)

<?php
 $server_name = "localhost";

  $user_name = "my_username";

  $password = "my_password";

  $db_name = "my_DB";


/* Attempt MySQL server connection. */

  $link = new mysqli($server_name, $user_name,

  $password, $db_name);


 // Check connection

  if($mlink === false){

  die("ERROR: Could not connect. " . $link->connect_error);

  }

  // Attempt select query execution

  $sql = "SELECT * FROM Users LIMIT 25";

  if($result = $link->query($sql)){

  if($result->num_rows > 0){

  echo "<table>";

  echo "<tr>";

  echo "<th>ID</th>";

  echo "<th>First Name</th>";

  echo "<th>Last Name</th>";

  echo "<th>UserName</th>";

  echo "<th>email</th>";

  echo "</tr>";

  while($row = $result->fetch_array()){

  echo "<tr>";

  echo "<td>" . $row['id'] . "</td>";

  echo "<td>" . $row['first_name'] . "</td>";

  echo "<td>" . $row['last_name'] . "</td>";

  echo "<td>" . $row['user_name'] . "</td>";

  echo "<td>" . $row['email'] . "</td>";

  echo "</tr>";

  }

  echo "</table>";

  // Free result set

  $result->free();

  } else{

  echo "No records matching your query were found.";

  }

  } else{

  echo "ERROR: Could not able to execute $sql. " . $link->error;

  }

  

  

  // Close connection

  $link->close();

  ?>

Tags: PHP MySQL Limit: Data Selections, results per page, offset, next page, loggin attemps, order by, variable, update, limit mysql connection, limit mysql results, connections
mysql limit range
limiting number of records per page using php
mysql limit offset pagination
mysql limit order by
mysql limit number of rows in table

PHP MySQL Limit Data - MySQLi (Procedural)

The SQL query below says "return only 14 records per page, start on record 21 (OFFSET 20)": Example using MySQLi (Procedural)

Example (this is HTML - PHP editor, change text on this window)

<?php
 $server_name = "localhost";

  $user_name = "my_username";

  $password = "my_password";

  $db_name = "my_DB";


/* Attempt MySQL server connection. */

  $link = mysqli_connect($server_name, $user_name,

  $password, $db_name);


// Check connection

  if($link === false){

  die("ERROR: Could not connect. " . mysqli_connect_error());

  }
// Attempt select query execution

  $sql = "SELECT * FROM Users LIMIT 20, 14";

  if($result = mysqli_query($link, $sql)){

  if(mysqli_num_rows($result) > 0){
 echo "<table>";

  echo "<tr>";

  echo "<th>ID</th>";

  echo "<th>First Name</th>";

  echo "<th>Last Name</th>";

  echo "<th>UserName</th>";

  echo "<th>email</th>";

  echo "</tr>";

  while($row = $result->fetch_array()){

  echo "<tr>";

  echo "<td>" . $row['id'] . "</td>";

  echo "<td>" . $row['first_name'] . "</td>";

  echo "<td>" . $row['last_name'] . "</td>";

  echo "<td>" . $row['user_name'] . "</td>";

  echo "<td>" . $row['email'] . "</td>";

  echo "</tr>";

  }

  echo "</table>";

  // Close result set

  mysqli_free_result($result);

  } else{

  echo "No records matching your query were found.";

  }

  } else{

  echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);

  }

  

  // Close connection

  mysqli_close($link);

  ?>

The example above "return only 14 records, start on record 21 (OFFSET 20)":
$sql = "SELECT * FROM Users LIMIT 20, 14";
We used Shorter syntax to achieve the the result:

Using OFFSET
$sql = "SELECT * FROM Orders LIMIT 14 OFFSET 20";

PHP Get Last ID - MySQLi (PDO) extension

The following example insert another row and get the last ID from table named "Users" in database my_DB using PDO

Example (this is HTML - PHP editor, change text on this window)

<?php
 $server_name = "localhost";

  $user_name = "my_username";

  $password = "my_password";

  $db_name = "my_DB";


try {

  $link = new PDO("mysql:host=$server_name;dbname=$db_name",

  $user_name, $password);

  // set the PDO error mode to exception

  $link->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);


 $sql = "INSERT INTO Members (first_name, last_name, user_name, email)

  VALUES  ('Stwart', 'Martin', 'StwartM', 'StwartM@agernic.com'";

  // use exec() because no results are returned

  $link->exec($sql);

  $last_id = $conn->lastInsertId();

  echo "New record created successfully. Last inserted ID is: " . $last_id;

  } catch(PDOException $e) {

  echo $sql . "<br />" . $e->getMessage();

  }


$link = null;
 ?>

Output
last id : 4

PHP MySQL Limit: Data Selections, results per page, offset, next page, loggin attemps, order by, variable, update, limit mysql connection, limit mysql results, connections
mysql limit range
limiting number of records per page using php
mysql limit offset pagination
mysql limit order by
mysql limit number of rows in table

PHP MySQLi Limit Data - php tutorial

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