update specific field data on sql database - php

Question

so i have a table of data in web ui
as soon as I click the button. all of the field data in "Status Email" changed. not just selected field that i meant.
this is the sintaks sql
if($mail->Send())
{
$query = "UPDATE nearly_inactive SET EmailSent = 'Sudah Kirim Email' WHERE EmailSent = 'Belum Kirim Email'";
$update = $con->prepare($query);
$update->execute();
}
how can i get the "update" only the data that I click on the button??

Answer 1

Get specific field
In order to get the specific field from a MYSQL database
Select column FROM databse WHERE x = y
Example:
SELECT id, firstname, lastname FROM MyGuests WHERE lastname='Doe'
The issue
It's best to get a unique identifier, which no other user has used. For example a 10 digit user id code. Check that this code doesn't exist, for it to be unique.
UPDATE:
Easily use the UNIQUE SQL tag to resolve this issue.
CREATE TABLE X (
ID INT UNIQUE
)
Example:
SELECT id, firstname, lastname FROM MyGuests WHERE id=ryan9273__2
Update a specific field
Now that we have fixed the issue we can easily
UPDATE x SET y=z WHERE id=b
Lets fix your code:
UPDATE nearly_inactive SET EmailSent = 'Sudah Kirim Email' WHERE EmailSent = 'Belum Kirim Email'
Lets make it more dynamic
UPDATE nearly_inactive SET :email = :emailaddr WHERE EmailSent = :id
final code:
$query = $con->prepare("UPDATE nearly_inactive SET :email = :emailaddr WHERE EmailSent = :id");
$query->bindParam(':email', $email, PDO::PARAM_STR);
$query->bindParam(':emailaddr', $emailaddr, PDO::PARAM_STR);
$query->bindParam(':id', $id, PDO::PARAM_STR);
$update->execute();
Security Matters
You are using PDO, so use bindParam aswell. Secret code enthusiast answer isn't as secure as the current code i provided!
Practice Makes Perfect
Please don't copy my code right away. learn from it and code it again ! Make it better. Also check the official PHP documentation for more info on these topics
Stay safe !
Regards,
Ryan

Answer 2

you need to determine which record need to be changed based on their unique ID. usually it's the primary key of the table. so, If your primary key is enroller_id, then pass the value of enroller_id, and put it inside your sql.
if($mail->Send())
{
//prepare your query
$statement = $this->mysqli->prepare("UPDATE nearly_inactive SET EmailSent = 'Sudah Kirim Email' WHERE enroller_id = ?");
//check for statement preparation
if ($statement === false) {
trigger_error($this->mysqli->error, E_USER_ERROR);
return;
}
//bind the value
$statement->bindParam("i", $id);
//get id for the query
$id = your_field_enroller_id;
//execute the statement
$statement->execute();
}
where enroller_id is your table primary key, and $id is the value of that field primary key.

Answer 3

<?php
$servername="localhost";
$username="root";
$password="";
$dbname="demon";
//CREATE CONNECTION
$conn=new mysqli($servername,$username,$password,$dbname);
//CHECK CONNECTION
if ($conn->connect_error)
{
die("connection failed:".$conn->connect_error);
}
$sql="UPDATE student set NAME='JohnRambo' where STUDENT_ID=1000";
$result=$conn->query($sql);
if ($result===TRUE)
{
echo"NEW RECORD CREATED SUCCESSFULLY";
}
else
{
echo "ERROR:".$sql."<br>".$conn->error;
}
$conn->close();
?>