PHP MySQL-opdateringsdata
Dateer data op in 'n MySQL-tabel deur MySQLi en PDO te gebruik
Die UPDATE-stelling word gebruik om bestaande rekords in 'n tabel op te dateer:
UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value
Let op die WHERE-klousule in die UPDATE-sintaksis: Die WHERE-klousule spesifiseer watter rekord of rekords wat opgedateer moet word. As jy die WHERE-klousule weglaat, sal alle rekords opgedateer word!
Om meer te wete te kom oor SQL, besoek asseblief ons SQL-tutoriaal .
Kom ons kyk na die "MyGuests"-tabel:
| 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 |
Die volgende voorbeelde werk die rekord op met id=2 in die "MyGuests"-tabel:
Voorbeeld (MySQLi objekgeoriënteerd)
<?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();
?>
Voorbeeld (MySQLi-prosedure)
<?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);
?>
Voorbeeld (BOB)
<?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;
?>
Nadat die rekord opgedateer is, sal die tabel soos volg lyk:
| id | firstname | lastname | reg_date | |
|---|---|---|---|---|
| 1 | John | Doe | [email protected] | 2014-10-22 14:26:15 |
| 2 | Mary | Doe | [email protected] | 2014-10-23 10:22:30 |