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Published byDale Howard Modified over 9 years ago
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MySQL and PHP 3 March 2006 Adina Crainiceanu www.cs.usna.edu/~adina IT420: Database Management and Organization
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Web Database Architecture Client browser Web server with PHP enabled Database Management System HTTPAPI
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Why Use DBMS? Fast access to data Queries to easily extract data Built-in concurrency control Built-in security control
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Learned So Far… Client browser Web server with PHP enabled Database Management System HTTPAPI
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Goals Today MySQL Connect from PHP to MySQL
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MySQL Relational Database Management System Free Open source Portable High performance Support available
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Working with MySQL SQL Monitor Always available Write SQL statements ; after each statement! PHPMyAdmin
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Current Settings Each machine is a server – web, db Web server: localhost:80 MySQL server: localhost:3306 MySQL user: root, no password ALL privileges Disk location D:/sokkit site/ mysql/
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Lab Demo Start MySQL server Use MySQL – local machine
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Lab Exercise Start MySQL server Sokkit Control Panel Start database Start MySQL monitor D:/sokkit/mysql/bin/mysql –u root Create a database called vp5fund create database vp5fund; Check database was created show databases;
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SQL for MySQL Surrogate keys variant: AUTO_INCREMENT If column value left blank, generated value = max+1 show databases tables describe tableName
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VP-5 MVR Fund Raiser Application
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Lab Exercise To use the database just created: use vp5fund; Create table (use SQL) Items(ItemName, Price) Orders(OrderID, ShippingAddress) ItemsOrdered(OrderID, ItemName, Quantity) Insert few rows in tables List all rows in Orders table (use SQL)
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Example Application Database: dbmusic Table: songs(ISBN, Title, SingerID, Length)
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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!
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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: '.$row[1].' '; } //close connection mysql_free_result($results); mysql_close($db);
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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; }
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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’);
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Query the Database qresult mysql_query(query) Example: $query = “select * from songs where Title like ‘%home%’ ”; $results = mysql_query($query);
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Process 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 “ ”; }
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Disconnect from Database Free query results mysql_free_result(qresult); Close connection mysql_close(connection)
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Lab Exercise Save order data from VP-5 Fund Raiser application into vp5fund database. Display appropriate message in order confirmation screen. Display all orders from VP-5 Fund Raiser application. Display all orders from VP-5 Fund Raiser application with shipping address in Maryland.
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Save Your Work! Copy the D:\sokkit\mysql\data\yourdatabase directory to your X drive
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