The MySQL UPDATE query is used to update existing records in a table in a MySQL database.
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 :
<?phptry{ $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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