The MySQL UPDATE query is used to update existing records in a table in a MySQL database.
It can be used to update one or more field at the same time.
It can be used to specify any condition using the WHERE clause.
Syntax :
The basic syntax of the Update Query is –
Implementation of Where Update Query :
Let us consider the following table “Data” with four columns ‘ID’, ‘FirstName’, ‘LastName’ and ‘Age’.
To update the “Age” of a person whose “ID” is 201 in the “Data” table, we can use the following code :
Update Query using Procedural Method :
<?php
$link = mysqli_connect("localhost", "root", "", "Mydb");
if($link === false){
die("ERROR: Could not connect. "
. mysqli_connect_error());
}
$sql = "UPDATE data SET Age='28' WHERE id=201";
if(mysqli_query($link, $sql)){
echo "Record was updated successfully.";
} else {
echo "ERROR: Could not able to execute $sql. "
. mysqli_error($link);
}
mysqli_close($link);
?>
|
Output :
Table After Updation –
The output on Web Browser :
Update Query using Object Oriented Method :
<?php
$mysqli = new mysqli("localhost", "root", "", "Mydb");
if($mysqli === false){
die("ERROR: Could not connect. "
. $mysqli->connect_error);
}
$sql = "UPDATE data SET Age='28' WHERE id=201";
if($mysqli->query($sql) === true){
echo "Records was updated successfully.";
} else{
echo "ERROR: Could not able to execute $sql. "
. $mysqli->error;
}
$mysqli->close();
?>
|
Output :
Table After Updation –
The output on Web Browser :
Update Query using PDO Method :
<?php
try{
$pdo = new PDO("mysql:host=localhost;
dbname=Mydb", "root", "");
$pdo->setAttribute(PDO::ATTR_ERRMODE,
PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e){
die("ERROR: Could not connect. "
. $e->getMessage());
}
try{
$sql = "UPDATE data SET Age='28' WHERE id=201";
$pdo->exec($sql);
echo "Records was updated successfully.";
} catch(PDOException $e){
die("ERROR: Could not able to execute $sql. "
. $e->getMessage());
}
unset($pdo);
?>
|
Output :
Table After Updation –
The output on Web Browser :
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