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PO
 

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  1. PO
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    <p>If I was an architector of the DB, I'd make structure like this (approx.)</p> <pre><code>CREATE TABLE statuses( id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, name VARCHAR(255) NOT NULL, description VARCHAR(255) DEFAULT NULL, PRIMARY KEY (id), UNIQUE INDEX name (name) ) ENGINE = INNODB CHARACTER SET utf8 COLLATE utf8_general_ci; CREATE TABLE users( id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, name VARCHAR(255) NOT NULL, PRIMARY KEY (id), UNIQUE INDEX name (name) ) ENGINE = INNODB CHARACTER SET utf8 COLLATE utf8_general_ci; CREATE TABLE messages( id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, reply_to INT(11) UNSIGNED NOT NULL, sender INT(11) UNSIGNED NOT NULL, recipient INT(11) UNSIGNED NOT NULL, subject VARCHAR(255) DEFAULT NULL, message TEXT DEFAULT NULL, `time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (id), INDEX FK_messages_messages_id (reply_to), INDEX FK_messages_users_id_recipient (recipient), INDEX FK_messages_users_id_sender (sender), CONSTRAINT FK_messages_messages_id FOREIGN KEY (reply_to) REFERENCES messages (id) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT FK_messages_users_id_recipient FOREIGN KEY (recipient) REFERENCES users (id) ON DELETE NO ACTION ON UPDATE NO ACTION, CONSTRAINT FK_messages_users_id_sender FOREIGN KEY (sender) REFERENCES users (id) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE = INNODB CHARACTER SET utf8 COLLATE utf8_general_ci; CREATE TABLE messages_statuses( message_id INT(11) UNSIGNED NOT NULL, status_id INT(11) UNSIGNED NOT NULL, PRIMARY KEY (message_id, status_id), INDEX FK_messages_statuses_statuses_id (status_id), CONSTRAINT FK_messages_statuses_messages_id FOREIGN KEY (message_id) REFERENCES messages (id) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT FK_messages_statuses_statuses_id FOREIGN KEY (status_id) REFERENCES statuses (id) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE = INNODB CHARACTER SET utf8 COLLATE utf8_general_ci; </code></pre> <p>I don't see anything hard here but if you'll got any questions - feel free to ask.</p>
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    1. POtable structure for personal messages
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    1. USChvanikoff
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    1. COWhat is messages_statuses? What is in this table, if each message can be deleted by each user? I mean, I have e.g. 5 messages in dialog between user1 and user2. User1 deletes messages 3 and 5, and User2 doesn't delete anything? What is in this table? How can I get only last message of each dialog?
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