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New Friends - PHP

One of the most compelling things PHP has going for it is it support for a wide variety of databases. And this week, PHP 101 is going to take advantage of that database support to create dynamic data-driven Web sites. This primer covers different techniques to select, insert and delete records, together with some tips to track and squash bugs when building SQL-driven sites.

TABLE OF CONTENTS:
  1. PHP 101 (part 4) - Look, Ma...It's Alive!
  2. Dumped!
  3. Hello Database!
  4. Different Strokes...
  5. ...For Different Folks
  6. What's In A Name?
  7. New Friends
  8. Today's Special
  9. Nuking The People
  10. Oops!
By: Vikram Vaswani and Harish Kamath, (c) Melonfire
Rating: starstarstarstarstar / 4
September 01, 2000

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Thus far, we've simply been using SELECT queries to pull information out of a database. But how about putting something in?

SQL aficionados know that this happens via an INSERT query - and our next example demonstrates how you can use an HTML form to insert data into the database.

<? // if form has not been submitted, display form if (!$submit) { ?> <html> <head> <basefont face=Arial> </head> <body> <h3>Enter your bookmarks:</h3> <form method="POST" action="push.php4"> <table> <tr> <td> Username </td> <td> <input name="username" length="10" maxlength="30"> </td> </tr> <tr> <td> Web site </td> <td> <input name="title1" length="30" maxlength="30"> </td> </tr> <tr> <td> URL </td> <td> <input name="url1" length="30"> </td> </tr> <tr> <td> Web site </td> <td> <input name="title2" length="30" maxlength="30"> </td> </tr> <tr> <td> URL </td> <td> <input name="url2" length="30"> </td> </tr> <tr> <td> Web site </td> <td> <input name="title3" length="30" maxlength="30"> </td> </tr> <tr> <td> URL </td> <td> <input name="url3" length="30"> </td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" name="submit" value="Submit"> </td> </tr> </table> </form> </body> </html> <? } // or process form input else { ?> <?php // connect to database $connection = mysql_connect("localhost", "test", "test") or die("Invalid server or user"); // select database mysql_select_db("php101",$connection); // formulate and run query $query = "insert into url_list(uid,title1,url1,title2,url2,title3,url3) values('$username','$title1','$url1','$title2','$url2','$tit le3','$url3')"; $result = mysql_query($query,$connection) or die("Error in query"); ?> <html> <head> <basefont face=Arial> </head> <body> <center> <h3>Success!</43> <table> <tr> <td> <?php echo $username; ?>'s bookmarks have been saved. </td> </tr> </center> </body> </html> <? } ?>
This time around, we've demonstrated yet another PHP function - mysql_select_db(), which allows you to specify the database which will be used when connecting to the database. And since you've specified the database, you can use mysql_query() instead of mysql_db_query() - while the latter needs the database name as parameter [as you've seen in the examples above], the former simply needs the query string and the connection identifier.

As you can see, inserting a record into the database is very straightforward - simply fire the query and your INSERT statement will be executed. The only way to find out if the INSERT was successful is to check the value of the variable $result - if the variable isn't set, it implies that something didn't go as planned.

 
 
>>> More PHP Articles          >>> More By Vikram Vaswani and Harish Kamath, (c) Melonfire
 

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