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IT420: Database Management and Organization PHP - MySQL Connection 8 March 2006 Adina Crainiceanu www.cs.usna.edu/~adina Web Database Architecture HTTP Client browser Web server with PHP enabled API Database Management System Goals Today Connect from PHP to MySQL MySQL Relational Database Management System Free Open source Portable High performance Support available Example Application Database: dbmusic Table: songs(ISBN, Title, SingerID, Length) Use DBMS from PHP Connect to the database server Specify database to use Send queries and retrieve results Process results Close connection All PHP functions return ‘false‘ if operation unsuccessful! Example: $searchterm = $_POST['searchterm']; //connect @ $db = mysql_connect('localhost','root'); if (!$db){ echo('connect failed'); exit; } $dbselected= mysql_select_db('dbmusic') or exit('could not select db'); //query $query = "select * from songs where Title like '%$searchterm%'"; //process results $results = mysql_query($query) or die("could not retrieve rows"); while ($row = mysql_fetch_row($results)){ echo 'Title: '.$row[1].' <br>'; } //close connection mysql_free_result($results); mysql_close($db); Connect to MySQL dbconnection mysql_connect(servername, username, [password]) Always test and handle errors! Example: $dbconn = mysql_connect(‘localhost’,’root’); if (!$dbconn){ echo ‘Could not connect to db. Exit’; exit; } Select Database to Use bool mysql_db_select(dbname, [dbconnection]) Always test and handle errors! Example: $dbs = mysql_db_select(‘dbmusic’) or die(‘Could not select db’); Query the Database qresult mysql_query(query) Example: $query = “select * from songs where Title like ‘%home%’ ”; $results = mysql_query($query); Process Select Results nbrows = mysql_num_rows(qresult) row = mysql_fetch_row(qresult) row = mysql_fetch_array(qresult) Example: while ($row = mysql_fetch_row($results)){ foreach($row as $column) echo “$column ”; echo “<br />”; } Check Modification Results intvar = mysql_affected_rows() Used after INSERT, DELETE, UPDATE Disconnect from Database Free query results mysql_free_result(qresult); Close connection mysql_close(connection) VP-5 MVR Fund Raiser Application Lab Exercise Recover the database vp5fund created last time D:\sokkit\mysql\data Start MySQL Monitor D: cd sokkit\mysql\bin mysql –u root To use the database: use vp5fund; These tables should exist: Items(ItemName, Price) Orders(OrderID, ShippingAddress) ItemsOrdered(OrderID, ItemName, Quantity) Insert few rows in tables Lab Exercise: PHP + MySQL Display all orders from VP-5 Fund Raiser application. For each order display: OrderID Shipping address Items names and price Display all orders from VP-5 Fund Raiser application with shipping address in Maryland. Lab Exercise: PHP + MySQL Save order data from VP-5 Fund Raiser application into vp5fund database. Save Your Work! Copy the D:\sokkit\mysql\data\ directory to your X drive