Referential Integrity problem when inserting into 2 tables at same time

Posted on 16th Feb 2014 07:03 pm by admin

Hello Everyone,

Im relativity new to PHP and MySQL and i have come up against a problem. i have 2 tables that are linked via foreign key constraints.
Code: --
-- Table structure for table `rides`
--
CREATE TABLE rides (
ride_date TIMESTAMP,
ride_name VARCHAR(50) NOT NULL,
planned_distance_travelled INT(5),
actual_distance_travelled INT(5),
planned_time_taken INT(5),
actual_time_taken INT(5),
average_heart_rate INT(5),
calories_burned INT(5),
weather_conditions VARCHAR(100),
feelings_about_ride VARCHAR(100),
PRIMARY KEY (ride_date)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- Table structure for table `usersrides`
--
CREATE TABLE usersrides (
userid SMALLINT UNSIGNED NOT NULL,
ride_date TIMESTAMP,
weight int(5),
PRIMARY KEY (userid,ride_date),
CONSTRAINT `fk_usersrides_ride_date` FOREIGN KEY (ride_date) REFERENCES ride (ride_date) ON DELETE RESTRICT ON UPDATE CASCADE
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

As you can see they are linked by the ride_date, which is a timestamp. This means that inorder to successfully insert data into the tables, the data must be inserted at the same time to the second.

This is the PHP script i am using to insert the data into the 2 tables:
Code: <?php

echo connect();

$userid = $_SESSION['userid'];
$weight = 0;

$ride_name = $_POST['ride_name'];
$planned_dist_trav = $_POST['planned_dist_trav'];
$actual_dist_trav = $_POST['actual_dist_trav'];
$planned_time_tak = $_POST['planned_time_tak'];
$actual_time_tak = $_POST['actual_time_tak'];
$avg_heart_rate = $_POST['avg_heart_rate'];
$calories= $_POST['calories'];
$weather_cond = $_POST['weather_cond'];
$feelings = $_POST['feelings'];

$ride_name = stripslashes($ride_name);
$planned_dist_trav = stripslashes($planned_dist_trav);
$actual_dist_trav = stripslashes($actual_dist_trav);
$planned_time_tak = stripslashes($planned_time_tak);
$actual_time_tak = stripslashes($actual_time_tak);
$avg_heart_rate = stripslashes($avg_heart_rate);
$calories = stripslashes($calories);
$weather_cond = stripslashes($weather_cond);
$feelings = stripslashes($feelings);

$ride_name = mysql_real_escape_string($ride_name);
$planned_dist_trav = mysql_real_escape_string($planned_dist_trav);
$actual_dist_trav = mysql_real_escape_string($actual_dist_trav);
$planned_time_tak = mysql_real_escape_string($planned_time_tak);
$actual_time_tak = mysql_real_escape_string($actual_time_tak);
$avg_heart_rate = mysql_real_escape_string($avg_heart_rate);
$calories = mysql_real_escape_string($calories);
$weather_cond = mysql_real_escape_string($weather_cond);
$feelings = mysql_real_escape_string($feelings);


//add the date into the rides table
$sql="INSERT INTO rides (ride_name, planned_distance_travelled, actual_distance_travelled, planned_time_taken, actual_time_taken, average_heart_rate, calories_burned, weather_conditions, feelings_about_ride) VALUES ('$ride_name','$planned_dist_trav','$actual_dist_trav','$planned_time_tak','$actual_time_tak','$avg_heart_rate','$calories','$weather_cond','$feelings')";
$result=mysql_query($sql);

if (!$result) {
die('Error: ' . mysql_error());
}elseif ($result) {
echo "1 Record Added to the rides table";
echo "<BR>";
}


//add the date into the usersrides table
$sql1="INSERT INTO usersrides (userid, weight) VALUES ('$userid','$weight')";
$result1=mysql_query($sql1);

if (!$result1) {
die('Error: ' . mysql_error());
}elseif ($result1) {
echo "1 Record Added to the usersrides table";
//header("Refresh: 2; url=home.php");
}
mysql_close()

?>

I realise this is alot of reading, but i didnt know how to explain this situation any other way. At the moment, data is being inserted into the 'rides' table, but when it gets to the usersrides table a foriegn key error comes up.

What i would like to know is....Is what im trying to do possible?

Thanks in advance,
-Regards,

Your Answer:

Login to answer

Other forums

problem when runing a funciton
I am trying to connect to database using a funciton in a functions.php

<?php
funct

upload photo limits
ive got a upload photo script and im just trying to make more secure currently it limits size and as

search function
HI guys,

if anyone could point us in the right direction of how to do this, or provide some t

Apple's revamped lineup arrives

I'm personally curious about the magic mouse.. a multi-touch concept sounds like it could be nea

php ajax - two drop down list with a submit button
i have created a form with 2 drop-down list and a submit button. I would like to know how to pass th

Remote Database Access
Hey guys!!

OK, i'm used to only working with databases from the CPANEL, accessing phpMyAdmin

How many users online in the last 24-hours using time()?
I'm fairly new to PHP. I have a MySQL table called 'users' and a field called 'loggedin' which is in

Giving the below syntax error
Dear Experts,

I have used 2 buttons in gui status as display and cjhange.When the user wi

for some reason mysql query not working, not inserting, please check it out
This code is not inserting anything into my db, don't know why, the $_SESSION variable does contain

Two warning messages
Quote<b>Warning</b>: mysql_real_escape_string() expects parameter 1 to