PHP MySQL Tutorial

Publicēts: oktobris 14, 2010
Tags: MySQL , PHP , PHP MYSQL , PHP MYSQL pamācību , programmēšana , programmēšana Tutorial

PHP MySQL Tutorial

Publicēts: oktobris 14, 2010
Tags: MySQL , PHP , PHP MYSQL , PHP MYSQL pamācību , programmēšana , programmēšana Tutorial

Vienas un tikai datu bāzes pārvaldības programma interneta uzņēmējas klienti būs kādreiz mācīties ir Mans SQL. Iemesls, kāpēc tik daudzi pasaules mēroga-tīmekļa mitinātājiem piedāvā MySQL, iespējams, tiks izskaidrots turpmāk. Bieži ar citiem DMS MySQL izmanto SQL valodu un tika iegādāts ar Sun Microsystems šogad tikai apmēram vienu miljardu dolāru.

Atvērtā koda programmatūra programma

Par MySQL spēcīgākajiem priekšrocības persona ir tā, ka datu bāzu vadības metode ir balstīta uz atvērtu piegādes plānošanu. Tas nenozīmē, ka tas būtu uzskatāms freeware. Nē, vēl joprojām ir patentētas funkciju skaits uz šo programmu, un tas maksā naudu, lai izmantotu. Bet veidojot to kā atvērtu piegādes datora programmatūras MySQL ļauj tās lietotājiem noteiktība brīvības grozīt DBVS pēc saviem ieskatiem. Licencēts saskaņā ar General Public License MySQL ir atvērta piegādes kodu un kā programmatūras programma tiek izplatīta klientiem licence dod viņiem tiesības apskatīt, mainīt un uzlabot resursu kodu, tādējādi programmatūras pakotni. Tas ir cilvēks no iemesliem, kāpēc MySQL ir izrādīties tik ievērojami labi zināms.

Ātrus atjauninājumus un cilvēkiem mīļdzīvniekus

Kad citi datu bāzu pārvaldības sistēmām, piemēram, Oracle ir lēns par jaunumiem MySQL reti pieņemsim to klientiem gaidīt. Ar jaunām un modernizētām versiju nāk vairāk nekā parasti un sākotnējo pozīciju kā galvenā servera datu bāzi, kā tas izskatās MySQL ir atklājis savu vietu. Zināma un izmantota galvenokārt ar Linux operatīvo programmu, kas vienkārši notiek, ir vēlamais noteicošā metode neto serveriem, MySQL ir arī ātri un uzticami.

cPanel, phpMyAdmin un MySQL

Lielisks piemērs iesācēja platformas kurās izmanto datu bāzēm ir vadības panelis daudzi interneta saimniekiem likt lietā, cPanel. Ne tikai būs personai piekļūt video konsultācijas, lai radītu datubāzes, bet phpMyAdmin funkcija sniedz lietotājam vizuālo atbalstu pārvaldībā daudzus MySQL uzdevumus. Turklāt MySQL klātbūtne ļauj daudz vārdu mēroga tīmekļa mitinātājiem, lai nodrošinātu PHP skriptus, kas ļauj personai, lai attīstītu dinamisku pieteikumus par sava uzņēmuma mājas lapas

PHP MySQL Tutorial

Publicēts: oktobris 14, 2010
Tags: MySQL , PHP , PHP MYSQL , PHP MYSQL pamācību , programmēšana , programmēšana Tutorial

1.) CCCA ar IDX web dizainu

Satura vadības sistēma, kuras pamatā PHP un MySQL. Spēcīgs vēl viegli CMS visiem. Visaptverošu funkcionalitāti. Cenu, šķiet, būtu saprātīgi, nelielam uzņēmumam. Viegli uzstādīt un lietotājam draudzīgi. Pieejams tikai visiem IDX web dizainu klientiem. Sazinieties IDX web dizainu un Pieprasīt citātu

2.) Joomla ar Wilco Jansen

Godalgotās satura vadības sistēma (CMS), kas dod iespēju veidot Web vietas un spēcīgs tiešsaistes lietojumiem. Daudzi aspekti, tostarp tās vieglumu-of-izmantošanu un papla, padarījuši Joomla populārākās Web vietnes programmatūras pieejama. Best of all, Joomla ir open source risinājumu, kas ir brīvi pieejami ikvienam.

3.) WordPress ar Ryan Boren

State-of-the-art izdevniecības platforma ar uzsvaru uz estētika, web standartiem un lietojamību. WordPress ir gan brīva un brīnišķīgs vienlaicīgi.
Vienkāršāk, WordPress ir tas, ko jūs izmantojat, ja vēlaties strādāt ar savu blogošana programmatūru, nevis cīnīties pret to.

4.) Soholaunch

Viegli lietojams mājas izveides rīku, lai palīdzētu jums veidot, uzturēt un pārvaldīt jūsu personisko vai biznesa mājas lapā. Tas iet tieši no jūsu mājas lapā, padarot to viegli veikt iepirkumu grozs pasūtījumus internetā, izveidot veidlapas, un rediģēt vietnes lapas no jebkura datora pasaulē!

5.) Drupal

Bezmaksas programmatūras pakotne, kas ļauj individuāli vai lietotāju kopiena viegli publicēt, pārvaldīt un organizēt plašu satura tīmekļa vietnē. Desmitiem tūkstošu cilvēku un organizāciju ir izmanto Drupal pie varas rādītājiem dažādās tīmekļa vietnēs

PHP MySQL Tutorial

Publicēts: oktobris 14, 2010
Tags: MySQL , PHP , PHP MYSQL , PHP MYSQL pamācību , programmēšana , programmēšana Tutorial

Pirmais, kas mums jādara, ir savienot ar datu bāzi.

mysql_connect("somehost", "username", "password") or die ("Can't connect!");

This will try to connect to the database on somehost and login with “username” as the username and “password” as the password. If it can’t, it will output an error message saying that it can’t connect. For your own code be sure to change somehost to your host (most of the times it’s localhost, ask your admin), username to your username (duh), and password to your password. Another way to connect to a database is to open a persistent connection. To do this, use the mysql_pconnectfunction and pass it the same arguments as mysql_connect. Why open a persistent connection? When you call mysql_pconnect, instead of going out and opening a connection to the database, it sees if one is already open, if it is, the script will use it. Also, when the script has finished executing, the connection to the database will not automatically be closed like it is when using mysql_connect. This way the connection can be used later on. Using a persistent connection is a good idea if your scripts constantly need to connect to the database.

After we have opened a connection to the database, we then select a database.

mysql_select_db("database_name") or die("Can't select database!");

This will try to select the database named “database_name” (for your own code change it to the name of your database). If it can’t select the database, it will output and error. Once you’re actually connected to a database, you will want to query a table in the database to get whatever you want done. A query looks like this:

mysql_query("Some query");

Common queries are SELECTand INSERT For full documentation go to the mysql web site ( http://www.mysql.com ). Another common php function is mysql_num_rows; if it isn’t obvious this gets the number of rows from a query. Here is an example of how it can be used with mysql_query:

<?php

  $result= mysql_query("SELECT * FROM some_table");

  $number_of_rows= @mysql_num_rows($result);

  if ($number_of_rows == 0)

  {

    echo "Sorry there are no rows";

  }

  else {

    echo "Yes! we found some rows!";

  }

?>

Now you may be wondering why I put the @ sign before mysql_num_rows. In php, the @ sign suppress errors; I put it in front of mysql_num_rows so that if there are no rows, MySQL will not output a bunch of errors. So when would mysql_num_rows be useful? Well, you could use it for an authentication script which searchs the database for a username and password and if it doesn’t find any (i.e. if no rows are returned), it tells the user that the username, or password, are not correct.

Another really useful function is mysql_fetch_array, because it gets the rows and puts them in an array that contains the name of the rows. That way instead of having to access each row by number you can do it by name! For example, let’s say that our database looked like this:

User	Password
John	afasdfadsfdsf
Billy	tla;jrjealjwqsldajf
Mitch	pqrtupipripewir

We would use the following code to get the users’ names and output them:

<?php

  echo "The users in this database are: <br>";

  $result= mysql_query("SELECT * FROM some_table");

  while ($row= mysql_fetch_array($result))

  {

    $username= $row["User"];

    echo "$username<br>";

  }

?>

This will output all the usernames in a database; you can add error checking if you like. The while statement is read “while there are rows that satisfy the query, put the contents of the row from the column ‘User’ into the variable ‘username,’ and print the usernames (each on a new line) to an HTML page.”

Now let’s cover a couple of functions that actually work with the database. The first is mysql_create_db, don’t you just love how the functions are named you can figure out what they do just by looking at the function name, this one obviously creates a database. Here’s how to use it:

<?php

  echo "I am going to try to create a database...<br>";

  if (mysql_create_db("test_database"))

  {

    echo "Hooray, I've created the database!<br>";

  }

  else {

    echo "Darn couldn't create the database! because: ";

    echo "mysql_error() <br>";

  }

?>

You can see I used a new function, mysql_error, you don’t really need to know too much about it, all it does is return the error string sent by MySQL. Now since we learned how to create a database, how’s about we learn to delete one. To do that use the mysql_drop_db, here is how to use it:

<?php

  echo "I am going to try to delete a database...<br>";

  $result= mysql_drop_db("test_database");

  if (!$result)

  {

    echo "Darn couldn't I couldn't delete the database!<br>";

  }

  else {

    echo "Hooray, I've deleted the database<br>";

  }

?>

You can see that the syntax is very similar to that of mysql_create_db, just pop the name of the database you want to delete into the function.

The next two items aren’t functions, rather they are queries that you can use to manage an existing table. The following query will insert data into a database:

<?php

  echo "I am going to try to insert data into a table...<br>";

  $result= mysql_query("INSERT INTO test_database (username, password) VALUES

	               (Rahim, adfjaldadfsdaf)");

  if (!$result)

  {

    echo "Darn couldn't I couldn't delete the database!<br>";

  }

  else {

    echo "Hooray, I've deleted the database<br>";

  }

?>

This query should be pretty obvious, it inserts the data defined in between the parentheses into the rows. Just a little note to remember, the order in which you write out the column names is the order your data will be entered (i.e. a row with the contents Rahim will be entered under username, not password since we wrote username then pasword, if it was reveresd Rahim would be put under password).

The next query we’ve already gone over, I’m just going to add to it; after I’m done you should be able to use it to help create a simple search engine (upcomming tutorial)! For the sake of brevity I’ll remove all the extra php stuff and just show you the “meat” of the code.

$result= mysql_query("SELECT name FROM some_table WHERE name=Joe AND

         lastname=Sixpack OR lastname=Becker ORDER BY lastname LIMIT 20");

Now I know that looks like a long query, but it’s not really all that bad. What it’s pretty much saying is: “Get me the name from some_table where the name is Joe and the lastname is Sixpack or Becker, oh and by the way while your at it, put it in alphabetical order by the lastname; oh and one last thing, just get the first 20 results please.” MySQL has lots of other filters that you can add on to the SELECT statement, I highly suggest you download the MySQL documentation and give it a perusing.