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POSQL FOREIGN KEY USAGE ? what does it really do ? and when it was needed?
 

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  1. POSQL FOREIGN KEY USAGE ? what does it really do ? and when it was needed?
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    <p>ok im makeing a simple database for my example, there is users data and the user company's data .</p> <pre><code>CREATE TABLE `users` ( `UID` INT(25) NOT NULL AUTO_INCREMENT , `username` VARCHAR(60) NOT NULL , `password` VARCHAR(100) NOT NULL , `ownername` VARCHAR(150) NOT NULL , `userstatus` TINYINT(1) NOT NULL , `userregistertime` DATETIME NOT NULL , `userlastonline` DATETIME NOT NULL , PRIMARY KEY (`UID`) , INDEX `username` (`username` ASC) ) ENGINE = InnoDB DEFAULT CHARACTER SET = utf8; CREATE TABLE `company` ( `CID` INT(25) NOT NULL AUTO_INCREMENT , `UID` INT(25) NOT NULL , `companyname` VARCHAR(60) NOT NULL , `companyaddress` VARCHAR(255) NOT NULL , `companyemail` VARCHAR(255) NULL DEFAULT NULL , `companyphone` VARCHAR(20) NOT NULL , `companyimage` VARCHAR(255) NULL DEFAULT NULL , `companyyahoo` VARCHAR(255) NULL DEFAULT NULL , `companytwitter` VARCHAR(255) NULL DEFAULT NULL , `companykaskus` VARCHAR(255) NULL DEFAULT NULL , `companyfacebook` VARCHAR(255) NULL DEFAULT NULL , `companytype` TINYINT(1) NOT NULL DEFAULT '0' , `companystatus` TEXT NULL DEFAULT NULL , `companytemplate` TEXT NULL DEFAULT NULL , `companyintroduction` TEXT NULL DEFAULT NULL , `partnership` TINYINT(1) NOT NULL DEFAULT '0' , PRIMARY KEY (`CID`) , INDEX `ownername` (`UID` ASC) , INDEX `companyname` (`companyname` ASC) , CONSTRAINT `ownernamecompany` FOREIGN KEY (`UID` ) REFERENCES `users` (`UID` ) ON DELETE CASCADE ON UPDATE CASCADE) ENGINE = InnoDB DEFAULT CHARACTER SET = utf8; </code></pre> <p>1.why after i insert data to the users table ( uid is auto increment ) it doesnt update my company UID table ?</p> <p>if you have php knowledge please see how im inserting it.</p> <pre><code>$RegisterInsert1 = $dbConnect-&gt;prepare("INSERT INTO users ( `username`, `password`, `ownername`, `userregistertime`, `userlastonline`) VALUES ( :username, :password, :ownername, :userregistertime, :userlastonline)"); $RegisterInsert1-&gt;execute($RegisterData1); </code></pre> <p>as you see, i get, UID = 1 ( auto ) then username,pasword,ownername,etc inserted on user table. but somehow my company UID is not updated. it should be UID = 1 then the rest CID ( auto ) companyname null, etc null.</p> <p>2.am i right defining a foreign key usage for?</p> <p>3.please give me the best example of inserting users data + company data with the right usage from the right usage of foreign.</p> <p>how im doing it right now</p> <pre><code>// INSERT USERS DB $RegisterInsert1 = $dbConnect-&gt;prepare("INSERT INTO users ( `username`, `password`, `ownername`, `userregistertime`, `userlastonline`) VALUES ( :username, :password, :ownername, :userregistertime, :userlastonline)"); $RegisterInsert1-&gt;execute($RegisterData1); // GET USERS GIVEN AUTO GENERATED UID // QUESTION ? THIS one should be automated by foreign useage ? $GetUid = $dbConnect-&gt;prepare("SELECT UID FROM users WHERE username = :username"); $GetUid-&gt;execute($RegisterData3); $UserID = $GetUid-&gt;fetch(); $RegisterData2['UID'] = $UserID; // INSERT COMPANY INFO + UID $RegisterInsert2 = $dbConnect-&gt;prepare("INSERT INTO company ( `UID`,`companyphone`,`partnership`) VALUES ( :UID, :companyphone, :partnership)"); $RegisterInsert2-&gt;execute($RegisterData2); </code></pre>
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    1. USAdam Ramadhan
    1. USAdam Ramadhan
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    1. COU will get more appreciate ans .. if u write only that code which is related to question drct...
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    2. COwhat im trying to do is updateing the UID.company from UID.users when im inserting data olny to users table. UID.users are auto incr, and it should be copyied to UID.company when its incr. so i dont have to use // GET USERS GIVEN AUTO GENERATED UID . hope you understand. thanks mate.
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