© Yanbu University College YANBU UNIVERSITY COLLEGE Management Science Department © Yanbu University College Module 6:WEB SERVER AND SERVER SIDE SCRPTING,

© Yanbu University College

YANBU UNIVERSITY COLLEGEManagement Science Department


Module 6:WEB SERVER AND SERVER SIDE SCRPTING, PART-2

Chapter 19of Text BookDATABSE Connection to MySQL / PHP

Internet & World Wide Web How to Program, 5/e


DATABASE CONNECTIVITYPHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform)PHP Connect to the MySQL ServerUse the PHP mysqli_connect() function to open a new connection to the MySQL server.Open a Connection to the MySQL ServerBefore 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.Syntaxmysqli_connect(host , username , password , dbname);STEPS1. CREATE A USER in PHPMyAdmin2. CREATE A DATABASE3. CONNECT TO DATABASE4. DATA RETREIVAL/ MANIPULATION






PHP Create Database and TablesA database holds one or more tables.Create a DatabaseThe 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$con=mysqli_connect(“localhost",“haseena",“husna");// Check connectionif (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); }// Create database$sql="CREATE DATABASE MIS352";if (mysqli_query($con,$sql)) { echo "Database MIS352 created successfully"; }else { echo "Error creating database: " . mysqli_error(); }?>


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.


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,...)


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 "<center><h1 style='color:aqua'>Record added successfully";}• else• {echo"error in insertion";}• mysqli_close($n);• ?>


Insert Data From a Form Into a Database

HTML FILE<html><body><h1> Insert your Detail in the DATABSE </h1><FORM ACTION="new_insert.php" method="post"

name="f1"><label>ID <input type="text"

name="sid"></label><br> <br><label>NAME <input type="text"

name="sn"></label><br> <br><label>MARKS <input type="text"

name="sa"></label><br> <br><label><br><br><input type="submit" name="b1" Value="INSERT">

<input type="reset" ></form></body></html>

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:


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:


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,$sql)){echo "<center><h1 style='color:aqua'>Record added successfully";}else{echo"error in insertion";}mysqli_close($n);?>

OUTPUT:


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']).


<?phpecho "<h1 style='color:magenta'>The contents of Marks Table:</h1><br> <br>";$con=mysqli_connect("localhost","PHPClass","hello","MIS352");// Check connectionif (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); }$result = mysqli_query($con,"SELECT * FROM Marks");echo "<center> <table border='1'><tr><th>STD_ID</th><th>STD_NAME</th><th>STD_MARKS</th></tr>";while($row = mysqli_fetch_array($result)) {echo "<tr>";echo "<td>" . $row['STD_ID'] . "</td>";echo "<td>" . $row['STD_NAME'] . "</td>";echo "<td>" . $row['STD_MARKS'] . "</td>";echo "</tr>"; }echo "</center></table>";mysqli_close($con);?>

DATABASE CONNECTIVITY Complete example WITH mysqli_connect()


<html><Head></head><body><p> ID NAME EMAIL </p><br><?php//connection to the database$con=mysqli_connect("localhost",”haseena",”husna","mis352"); // Check connectionif (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); }//execute the SQL query and return records$result = mysqli_query($con,"SELECT * FROM student");//fetch tha data from the databasewhile($row = mysqli_fetch_array($result)) {//display the results echo $row['ID'] . " " . $row['NAME']. " " . $row['EMAIL']; echo "<br />"; }//close the connectionmysqli_close($con);?> </body></html>

DATABASE CONNECTIVITY Complete example WITH mysqli_connect()


Output


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");


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<br>";

//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 $row{'year'}."<br>";}//close the connectionmysql_close($dbhandle);?>


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['EMAIL'];echo "<br>";}?>


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['EMAIL'];echo "<br>";}?>


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 EMAIL=‘[email protected]'";if (mysqli_query($con,$b)){echo("RECORD UPDATED SUCCESFUL ");}?>


PHP MySQL Delete

The DELETE FROM statement is used to delete records from a database table.<?php$con=mysqli_connect("localhost","PHPClass","hello","MIS352");// Check connectionif (mysqli_connect_errno()){echo "Failed to connect to MySQL: " . mysqli_connect_error();}$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:

Documents

© Yanbu University College YANBU UNIVERSITY COLLEGE Management Science Department © Yanbu University College Module 6:WEB SERVER AND SERVER SIDE SCRPTING,