PHP MySQL excluir dados
Excluir dados de uma tabela MySQL usando MySQLi e PDO
A instrução DELETE é usada para excluir registros de uma tabela:
DELETE FROM table_name
WHERE some_column = some_value
Observe a cláusula WHERE na sintaxe DELETE: A cláusula WHERE especifica qual registro ou registros devem ser excluídos. Se você omitir a cláusula WHERE, todos os registros serão excluídos!
Para saber mais sobre SQL, visite nosso tutorial SQL .
Vejamos a tabela "MyGuests":
| id | firstname | lastname | reg_date | |
|---|---|---|---|---|
| 1 | John | Doe | [email protected] | 2014-10-22 14:26:15 |
| 2 | Mary | Moe | [email protected] | 2014-10-23 10:22:30 |
| 3 | Julie | Dooley | [email protected] | 2014-10-26 10:48:23 |
Os exemplos a seguir excluem o registro com id=3 na tabela "MyGuests":
Exemplo (orientado a objetos MySQLi)
<?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 to delete a record
$sql = "DELETE FROM MyGuests WHERE id=3";
if ($conn->query($sql) === TRUE) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
$conn->close();
?>
Exemplo (procedimento MySQLi)
<?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 to delete a record
$sql = "DELETE FROM MyGuests WHERE id=3";
if (mysqli_query($conn, $sql)) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . mysqli_error($conn);
}
mysqli_close($conn);
?>
Exemplo (DOP)
<?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 to delete a record
$sql = "DELETE FROM MyGuests WHERE id=3";
// use exec() because no results are returned
$conn->exec($sql);
echo "Record deleted successfully";
} catch(PDOException $e) {
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>
Após a exclusão do registro, a tabela ficará assim:
| id | firstname | lastname | reg_date | |
|---|---|---|---|---|
| 1 | John | Doe | [email protected] | 2014-10-22 14:26:15 |
| 2 | Mary | Moe | [email protected] | 2014-10-23 10:22:30 |