Insert into 2 tables from 1 form [duplicate] - php

Question

This question already has answers here:
MySQL Insert into multiple tables? (Database normalization?) [duplicate]
(7 answers)
Closed 9 years ago.
How do I insert from 1 form into 2 tables?
I want to submit into tables: gallery and cat.
This is the code I have for just submitting into gallery. How do I add info to the cat table simultaneously?
$sql = 'INSERT INTO gallery (image_url, image_name, image_description)
VALUES (?, ?, ?)';
$stmt = $conn->stmt_init();
if ($stmt->prepare($sql)) {
$stmt->bind_param('sss', $_FILES['upload']['name'], $_POST['image_name'],
$_POST['image_description']);
$OK = $stmt->execute();
}
What do I do with this:
$sql_2 = 'INSERT INTO cat (cat_name) VALUES (?)';

Answer 1

After the code you have above, just initialize a new statement, bind it, and execute. You can use the existing connection ($conn). The $sql and $stmt variables have already done their job by inserting into the first table, so just reset them for the second insert.
... your code as posted above, followed by:
$sql = 'INSERT INTO cat (cat_name) VALUES (?)';
$stmt = $conn->stmt_init();
if ($stmt->prepare($sql)) {
$stmt->bind_param('s', put your cat_name value here);
$OK = $stmt->execute();
}
The important thing to remember is that the second insert is just like the first: you have to initialize it, bind it, and execute it.

Answer 2

You should use transactions as demonstrated here.

Answer 3

No, you can't insert into multiple tables in one MySQL command. You can however use transactions.
BEGIN
INSERT INTO users (username, password)
VALUES('test', 'test')
INSERT INTO profiles (userid, bio, homepage)
VALUES(LAST_INSERT_ID(),'Hello world!', 'http://www.stackoverflow.com');
COMMIT;
Have a look at LAST_INSERT_ID to reuse autoincrement values.
Edit: you said "After all this time trying to figure it out, it still doesn't work. Can't I simply put the just generated ID in a $var and put that $var in all the MySQL commands?"
Let me elaborate: there are 3 possible ways here:
1/ Is the code you see above. This does it all in MySQL, and the LAST_INSERT_ID in the second statement will automatically be the value of the autoincrement-column that was inserted in the first statement.
Unfortunately, when the second statement itself inserts rows in a table with an auto-increment column, the LAST_INSERT_ID will be updated to that of table 2, and not table 1. If you still need that of table 1 afterwards, we will have to store it in a variable. This leads us to ways 2 and 3:
2/ Will stock the LAST_INSERT_ID in a MySQL variable:
A/ INSERT B/ SELECT LAST_INSERT_ID into #mysql_variable_here C/ INSERT INTO table2 (#mysql_variable_here D/ INSERT INTO table3 (#mysql_variable_here ...
3/ Will stock the LAST_INSERT_ID in a php variable (or any language that can connect to a database, of your choice):
A/ INSERT B/ Use your language to retrieve the LAST_INSERT_ID, either by executing that literal statement in MySQL, or using for example php's mysql_insert_id() which does that for you C/ INSERT ()