CODEWITHSUNDEEP
mysql
Florin Frătică
Florin Frătică

Reputation: 587

Inserting values in 2 tables where the 2nd table need an ID from the 1st table

I want to make a basic forum for my website. I have 2 tables for this:

table topics: fields id, title

table posts: fields id, topicid, message

When a user want's to create a topic he has to complete a form with topic title and message. The title will be inserted in the topics table and the message in the posts table, but I will need topicid (field id in topics table) for the second insert.

INSERT INTO topics (title) VALUES ('$title')
INSERT INTO posts (topicid, message) VALUES ('???', '$message')

How can I get the topicid?

Upvotes: 0

Views: 51

Answers (1)

Gabriel Santos
Gabriel Santos

Reputation: 4974

Mysql:

INSERT INTO topics (title) VALUES ('$title')
INSERT INTO posts (topicid, message) VALUES (LAST_INSERT_ID(), '$message')

Or with PHP:

[...]
// Connect to mysql
$title = 'Foo';
$message = 'Bar';

mysql_query('INSERT INTO topics (title) VALUES (' . $title . ')');
mysql_query('INSERT INTO posts (topicid, message) VALUES (' . mysql_insert_id() . ', ' . $message . ')');

Upvotes: 2

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