© Yanbu University College YANBU UNIVERSITY COLLEGE Management Science Department © Yanbu University College Module 6:WEB SERVER AND SERVER SIDE SCRPTING, PART-2 Chapter 19of Text Book DATABSE Connection to MySQL / PHP Internet & World Wide Web How to Program, 5/e

© Yanbu University College DATABASE CONNECTIVITY PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform) PHP Connect to the MySQL Server Use the PHP mysqli_connect() function to open a new connection to the MySQL server. Open a Connection to the MySQL Server Before we can access data in a database, we must open a connection to the MySQL server. In PHP, this is done with the mysqli_connect() function. Syntax mysqli_connect(host, username, password, dbname); STEPS 1.CREATE A USER in PHPMyAdmin 2.CREATE A DATABASE 3.CONNECT TO DATABASE 4.DATA RETREIVAL/ MANIPULATION

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PHP Create Database and Tables A database holds one or more tables. Create a Database The CREATE DATABASE statement is used to create a database table in MySQL. We must add the CREATE DATABASE statement to the mysqli_query() function to execute the command. The following example creates a database named “MIS352": <?php $con=mysqli_connect(“localhost",“haseena",“husna"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } // Create database $sql="CREATE DATABASE MIS352"; if (mysqli_query($con,$sql)) { echo "Database MIS352 created successfully"; } else { echo "Error creating database: ". mysqli_error(); } ?>

© Yanbu University College Create a Table The CREATE TABLE statement is used to create a table in MySQL. We must add the CREATE TABLE statement to the mysqli_query() function to execute the command. The following example creates a table named “MArks", with three columns. The column names will be “STD_ID", “STD_NAME" and “STD_MARKS": <?php $con=mysqli_connect("localhost","PHPClass","hello","MIS352"); // Check connection if(mysqli_connect_errno()) { echo "Failed to connect to MySQL:". mysqli_connect_error(); } // Create table $sql="CREATE TABLE Marks(STD_ID CHAR(30),STD_NAME CHAR(30),STD_MARKS INTO(20))"; // Execute query if(mysqli_query($con,$sql)) {echo "Table Marks created successfully";} else { echo "Error in creating table: ". mysqli_error(); } ?> Note: When you create a database field of type CHAR, you must specify the maximum length of the field, e.g. CHAR(50). The data type specifies what type of data the column can hold.

© Yanbu University College PHP MySQL Insert Into Insert Data Into a Database Table The INSERT INTO statement is used to add new records to a database table. Syntax It is possible to write the INSERT INTO statement in two forms. The first form doesn't specify the column names where the data will be inserted, only their values: INSERT INTO table_name VALUES (value1, value2, value3,...) The second form specifies both the column names and the values to be inserted: INSERT INTO table_name (column1, column2, column3,...) VALUES (value1, value2, value3,...)

© Yanbu University College PHP MySQL Insert Into Example:In the previous slide we created a table named “Marks", with three columns; “STD_ID", “STD_Name" and “STD_Marks". We will use the same table in this example. The following example adds two new records to the “Marks" table: <?php // connect with the database and user in Php Myadmin $n=mysqli_connect("localhost","PHPClass","hello","MIS352"); if (mysqli_connect_errno()) { echo(" Error In connection"); } else { echo("database connected"); } $stuid=($_POST['sid']); $stuname=($_POST['sn']); $stumarks=intval($_POST['sa']); $sql="insert into Marks(STD_ID,STD_NAME,STD_MARKS) values ('$stuid','$stuname',$stumarks)"; if(mysqli_query($n,$sql)) {echo " Record added successfully";} else {echo"error in insertion";} mysqli_close($n); ?>

© Yanbu University College Insert Data From a Form Into a Database HTML FILE Insert your Detail in the DATABSE ID NAME MARKS OUT PUT Now we will create an HTML form that can be used to add new records to the “MIS352" table. Here is the HTML form:

© Yanbu University College Insert Data From a Form Into a Database Inserting record When a user clicks the submit button in the HTML form in the example above, the form data is sent to "insert.php". The "insert.php" file connects to a database, and retrieves the values from the form with the PHP $_POST variables. Then, the mysqli_query() function executes the INSERT INTO statement, and a new record will be added to the “Marks" table. Here is the "insert.php" page:

© Yanbu University College Insert Data From a Form Into a Database(contd) Insert.php <?php // connect with the database and user in Php Myadmin $n=mysqli_connect("localhost","PHPClass","hello","MIS352"); if (mysqli_connect_errno()) { echo(" Error In connection"); } else { echo("database connected"); } $stuid=($_POST['sid']); $stuname=($_POST['sn']); $stumarks=intval($_POST['sa']); $sql="insert into Marks(STD_ID,STD_NAME,STD_MARKS) values ('$stuid','$stuname',$stumarks)"; if(mysqli_query($n,$sql)) {echo " Record added successfully";} else {echo"error in insertion";} mysqli_close($n); ?> OUTPUT:

© Yanbu University College PHP MySQL Select Select Data From a Database Table The SELECT statement is used to select data from a database. Syntax SELECT column_name(s) FROM table_name To get PHP to execute the statement above we must use the mysqli_query() function. This function is used to send a query or command to a MySQL connection. The example below stores the data returned by the mysql_query() function in the $result variable. Next, we use the mysqli_fetch_array() function to return the first row from the recordset as an array. Each call to mysqli_fetch_array() returns the next row in the recordset. The while loop loops through all the records in the recordset. To print the value of each row, we use the PHP $row variable ($row['FirstName'] and $row['LastName']).

© Yanbu University College <?php echo " The contents of Marks Table: "; $con=mysqli_connect("localhost","PHPClass","hello","MIS352"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM Marks"); echo " STD_ID STD_NAME STD_MARKS "; while($row = mysqli_fetch_array($result)) { echo " "; echo " ". $row['STD_ID']. " "; echo " ". $row['STD_NAME']. " "; echo " ". $row['STD_MARKS']. " "; echo " "; } echo " "; mysqli_close($con); ?> DATABASE CONNECTIVITY Complete example WITH mysqli_connect()

© Yanbu University College ID NAME <?php //connection to the database $con=mysqli_connect("localhost",”haseena",”husna","mis352"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } //execute the SQL query and return records $result = mysqli_query($con,"SELECT * FROM student"); //fetch tha data from the database while($row = mysqli_fetch_array($result)) { //display the results echo $row['ID']. " ". $row['NAME']. " ". $row[' ']; echo " "; } //close the connection mysqli_close($con); ?> DATABASE CONNECTIVITY Complete example WITH mysqli_connect()

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© Yanbu University College Die() Function Definition and Usage The die() function prints a message and exits the current script. This function is an alias of the exit() function. E.g. //connection to the database $dbhandle = mysql_connect(‘hostname’, ‘username’, ‘password’) or die("Unable to connect to MySQL");

© Yanbu University College DATABASE CONNECTIVITY WITH mysql_connect() <?php //connection to the database $dbhandle = mysql_connect(‘hostname’, ‘username’, ‘password’) or die("Unable to connect to MySQL"); echo "Connected to MySQL "; //select a database to work with $selected = mysql_select_db("examples",$dbhandle) or die("Could not select examples"); //execute the SQL query and return records $result = mysql_query("SELECT id, model,year FROM cars"); //fetch tha data from the database while ($row = mysql_fetch_array($result)) { echo "ID:".$row{'id'}." Name:".$row{'model'}."Year: ". //display the results $row{'year'}." "; } //close the connection mysql_close($dbhandle); ?>

© Yanbu University College PHP MySQL The Where Clause <?php $con=mysqli_connect("localhost",”PHPClass",”hello","mis352"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM student WHERE NAME='hia' "); while($row = mysqli_fetch_array($result)) { echo $row['ID']. " ". $row['NAME']. " ". $row[' ']; echo " "; } ?>

© Yanbu University College PHP MySQL Order By Keyword The ORDER BY Keyword The ORDER BY keyword is used to sort the data in a recordset in ascending order by default. If you want to sort the records in a descending order, you can use the DESC keyword <?php $con=mysqli_connect("localhost",”PHPClass",”Hello","mis352"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM student ORDER BY ID "); while($row = mysqli_fetch_array($result)) { echo $row['ID']. " ". $row['NAME']. " ". $row[' ']; echo " "; } ?>

© Yanbu University College PHP MySQL Update The UPDATE statement is used to modify data in a table. <?php $con=mysqli_connect("localhost",”PHPClass",”Hello","mis352"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } $b ="UPDATE student SET ID=36 WHERE NAME=‘Hasi' AND if (mysqli_query($con,$b)) { echo("RECORD UPDATED SUCCESFUL "); } ?>

© Yanbu University College PHP MySQL Delete The DELETE FROM statement is used to delete records from a database table. <?php $con=mysqli_connect("localhost","PHPClass","hello","MIS352"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: ". mysqli_connect_error(); } $a="DELETE FROM Marks WHERE STD_NAME='Malak'"; if (mysqli_query($con,$a)) { echo "1 record Deleted"; } else { echo "Error in Deletion the record: ". mysqli_error(); } mysqli_close($con); ?> OUTPUT: