用于从数据库获取数据的PHP代码，然后显示在表中

Question

Am new to sql, mysql and php. However, am learning. I have a database that collects students admission records. I want a PHP script to extract some fields from the students profile and print in a table.

Below ia sample of the database structure and an entry.

Table structure for table `users`
--

CREATE TABLE IF NOT EXISTS `users` (
  `salt` text,
  `userid` int(11) NOT NULL AUTO_INCREMENT,
  `username` text,
  `password` text,
  `email` text,
  `register_date` int(11) DEFAULT NULL,
  `active` tinyint(4) DEFAULT NULL,
  `reg_salt` text,
  `level` int(11) DEFAULT NULL,
  `ip` text,
  `profile` text,
  PRIMARY KEY (`userid`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=9653 ;

--
-- Dumping data for table `users`
--

INSERT INTO `users` (`salt`, `userid`, `username`, `password`, `email`, `register_date`, `active`, `reg_salt`, `level`, `ip`, `profile`)

Within the 'Profile' column are data subsets that the user or admin enters via the website in a XML defined table. An example below

VALUES
('fc61f', 1, 'Admin', 'mutolo', 'smutolo@gmail.com', 1200247562, 1, 'e14973fc61f2bf249c540eb14b8525', 1, 'a:7:{s:14:"82.145.221.205";i:1;s:13:"82.145.221.54";i:1;s:14:"105.166.190.60";i:1;s:15:"197.181.203.204";i:1;s:14:"197.178.16.134";i:11;s:14:"105.166.241.43";i:1;s:15:"197.178.252.241";i:1;}', 'a:21:{s:10:"first_name";s:5:"Nzisa";s:9:"last_name";s:4:"Muli";s:6:"Gender";s:4:"Male";s:6:"County";s:0:"";s:8:"District";s:0:"";s:8:"Location";s:0:"";s:5:"Chief";s:0:"";s:6:"Orphan";s:25:"Yes Both Parents Deceased";s:6:"Parent";s:0:"";s:9:"Emergency";s:0:"";s:7:"Primary";s:0:"";s:4:"KCPE";s:0:"";s:20:"A_Little_Information";s:29:"I am the school administrator";s:9:"Notify_Me";s:1:"1";s:11:"alumni_year";s:4:"2010";s:7:"Picture";N;s:17:"alumni_include_me";s:1:"1";s:6:"Stream";s:0:"";s:9:"Admission";s:0:"";s:5:"House";s:0:"";s:8:"user_pic";s:5:"1.JPG";}'),
('4a1b6', 9641, 'bb', 'c80d5f83dbf874c4caebedfde385e1af', 'smutolo@gmail.com', 1389444756, 0, 'a2becf9eff6dbcde14ef8c1274a1b6', 10, NULL, 'a:21:
<====profile data starts here====>
    {s:10:"first_name";s:6:"Stella";s:9:"last_name";s:4:"King";s:6:"Gender";s:6:"Female";s:6:"County";s:5:"Kitui";s:8:"District";s:8:"Katulani";s:8:"Location";s:8:"Kathungi";s:5:"Chief";s:13:"Mr. Kasasaana";s:6:"Orphan";s:19:"Yes Father Deceased";s:6:"Parent";s:17:"Mr. Mutua Stephen";s:9:"Emergency";s:27:"Mr. Mutua Stephen-074321234";s:7:"Primary";s:7:"Kakuswi";s:4:"KCPE";s:3:"234";s:20:"A_Little_Information";s:39:"Am good in soccer\r\n\r\nAm allergic to oil";s:9:"Notify_Me";s:1:"1";s:11:"alumni_year";s:4:"2010";s:7:"Picture";N;s:17:"alumni_include_me";s:1:"1";s:6:"Stream";s:7:"1 South";s:9:"Admission";s:4:"3423";s:5:"House";s:5:"Nyayo";s:8:"user_pic";s:8:"9641.JPG";}')

I want a SQL and PHP code to extract some or all of the data in the column Profile.

Hope am clear. Thanks alot

Answer 1

To select all the results from DB you can do

SELECT * FROM `users`

This will fetch everything (All Users and ALL Columns).

To fetch a specific user you can do

SELECT * FROM `users` WHERE `userid` = 1

the above query will fetch a user with user id 1

Both of the above queries will fetch all the columns. In order to get a specific column you can do

 SELECT `username` FROM `users` 

it will give you all user names

Or for a specific user, you can again use the Where clause...So it will be

 SELECT `username` FROM `users` WHERE `userid` = 1