How to insert or update foreign key values using PHP - php

Question

I did 2 tables in mysql database
user_details
bank_details
In user_details am create following entity
user_id as a Primary Key
username
password
address
In bank_details am create following entity
id as a Primary Key
user_id as a Foreign Key
bank_name
ac_no
First am insert user details using following code
<?php
$un = $_POST['un'];
$ps = $_POST['ps'];
$adr = $_POST['adr'];
$sql = mysql_query("insert into user_details username='$un', password='$ps', address='$adr'");
?>
Now i need to insert Bank Details in bank_details table
<?php
$bn = $_POST['bn'];
$ac_no = $_POST['ac'];
$sql = mysql_query("insert into bank_details user_id= ?? bank_name='$bn', ac_no='$ac_no'");
?>
How can i define that foreign key values here ?

Answer 1

Your query omits the MYSQL SET keyword. Anyway, you can do this, as per your code convention:
<?php
$mysql = mysql_connect([...]
$un = mysql_real_escape_string($_POST['un'], $mysql);
$ps = mysql_real_escape_string($_POST['ps'], $mysql);
$adr = mysql_real_escape_string($_POST['adr'], $mysql);
$sql = mysql_query("insert into user_details SET username='$un', password='$ps', address='$adr'", $mysql);
if(!$sql)
{
// something went wrong with the query, add error handling here
trigger_error('query failed', E_USER_ERROR);
}
else
{
$user_id = mysql_insert_id(); //get the id of the last inserted query/user
$bn = mysql_real_escape_string($_POST['bn'], $mysql);
$ac_no = mysql_real_escape_string($_POST['ac'], $mysql);
$sql = mysql_query("insert into bank_details SET user_id = $user_id, bank_name='$bn', ac_no='$ac_no'", $mysql);
if(!$sql)
{
// something went wrong with the query, add error handling here
trigger_error('query failed', E_USER_ERROR);
}
}
?>
I must point out, however, that using the mysql_* family of functions is deprecated, and you should seriously start using mysqli_* functions instead.
UPDATE:
As Per CodeGodie's suggestion, here's the re-written code using mysqli_* functions:
<?php
$mysqli = mysqli_connect(SERVER_NAME, USER_NAME, PASSWORD, DB_NAME);
$un = mysqli_real_escape_string($_POST['un']);
$ps = mysqli_real_escape_string($_POST['ps']);
$adr = mysqli_real_escape_string($_POST['adr']);
$sql = mysqli_query($mysqli, "insert into user_details SET username='$un', password='$ps', address='$adr'");
if(!$sql)
{
// something went wrong with the query, add error handling here
trigger_error('query failed', E_USER_ERROR);
}
else
{
$user_id = mysqli_insert_id($mysqli); //get the id of the last inserted query/user
$bn = mysqli_real_escape_string($_POST['bn']);
$ac_no = mysqli_real_escape_string($_POST['ac']);
$sql = mysqli_query($mysqli, "insert into bank_details SET user_id = $user_id, bank_name='$bn', ac_no='$ac_no'");
if(!$sql)
{
// something went wrong with the query, add error handling here
trigger_error('query failed', E_USER_ERROR);
}
}
?>