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PHP Basic

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PHP Superglobals

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PHP Advanced

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PHP OOP

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MySQL Database

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PHP XML

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PHP Reference

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Text lesson

MySQL Update Data

Update Data In a MySQL Table Using MySQLi and PDO

The UPDATE statement is used to modify existing records in a table.

UPDATE table_name
SET column1=value, column2=value2,…
WHERE some_column=some_value

Note the WHERE clause in the UPDATE syntax: it determines which record or records will be updated. Omitting the WHERE clause will result in all records being updated!

Let’s take a look at the “MyGuests” table:

id	firstname	lastname	email	reg_date
1	John	Doe	[email protected]	2014-10-22 14:26:15
2	Mary	Moe	[email protected]	2014-10-23 10:22:30

The following examples update the record with id=2 in the “MyGuests” table:

Example (MySQLi Object-oriented)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;
$dbname = “myDB”;

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
  die(“Connection failed: “ . $conn->connect_error);
}

$sql = “UPDATE MyGuests SET lastname=’Doe’ WHERE id=2”;

if ($conn->query($sql) === TRUE) {
  echo “Record updated successfully”;
} else {
  echo “Error updating record: “ . $conn->error;
}

$conn->close();
?>

Example (MySQLi Procedural)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;
$dbname = “myDB”;

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
  die(“Connection failed: “ . mysqli_connect_error());
}

$sql = “UPDATE MyGuests SET lastname=’Doe’ WHERE id=2”;

if (mysqli_query($conn, $sql)) {
  echo “Record updated successfully”;
} else {
  echo “Error updating record: “ . mysqli_error($conn);
}

mysqli_close($conn);
?>

Example (PDO)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;
$dbname = “myDBPDO”;

try {
$conn = new PDO(“mysql:host=$servername;dbname=$dbname”, $username, $password);
  // set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  $sql = “UPDATE MyGuests SET lastname=’Doe’ WHERE id=2”;

  // Prepare statement
  $stmt = $conn->prepare($sql);

  // execute the query
$stmt->execute();

  // echo a message to say the UPDATE succeeded
  echo $stmt->rowCount() . ” records UPDATED successfully”;
} catch(PDOException $e) {
  echo $sql . “<br>” . $e->getMessage();
}

$conn = null;
?>

After updating the record, the table will appear as follows:

id	firstname	lastname	email	reg_date
1	John	Doe	[email protected]	2014-10-22 14:26:15
2	Mary	Doe	[email protected]	2014-10-23 10:22:30