Php verses MySQL

Introduction
• What is MySql ?
MySql is an open source relational database
management system.
• How MySql is related to PHP?
MySql acts as a back-end database server and
helps in data storage and management of data
stored at MySql database server.

Predefined Constant
MySql Fetch Constant :
• MYSQL_ASSOC : Columns are returned into the array
having the fieldname as the array index.
• MYSQL_BOTH : Columns are returned into the array
having both a numerical index and the field name as the array
index.
• MYSQL_NUM : Columns are returned into the array having
a numerical index to the fields. This index is start with 0, the
first field in the result.

PHP MySql Function
mysql_connect : Open a connection to a MySql server.
mysql_close : Close MySql connection.
mysql_create_db : Create a MySql database.
mysql_error : Returns the text of the error message
from previous MySql operation.
mysql_fetch_assoc : Fetch a result row as an
associative array.
mysql_select_db : Select a MySql database.

How to connect to MySql via PHP.
<?php
$host = "localhost";
$username = "root";
$password = "";
mysql_connect($host,$username,$password)
or die(mysql_error());
?>

How to Select database in a table.
<?php
mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("dbemp") or die(mysql_error());
$result=mysql_query("select * from emp")
$row=mysql_fetch_array($result);
echo "<br>Roll:".$row['empno'];
echo "<br>Name:".$row['name'];
echo "<br>Roll:".$row['Job'];
?>

How to select values from MySql table.
<?php
mysql_connect("localhost", "root", "") or
die(mysql_error());
mysql_select_db("dbemp") or die(mysql_error());
$result=mysql_query("select * from emp")
echo "<table width='20%' bgcolor='lime' border='4'
bordercolor='green'>";
echo "<tr> <th>Empno</th> <th>Name</th> </tr>";

Contin…
while($row = mysql_fetch_array( $result ))
{
echo "<tr> <td>";
echo $row['empno'];
echo "</td> <td>";
echo $row['name'];
echo "</td></tr>";
}
echo "</table>";
?>

Display data from database using fetch_assoc function
$sql = "SELECT empno, name,Job FROM emp";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{while($row = $result->fetch_assoc())
{ echo "<br> Empno: ". $row["empno"]. " Name: ". $row["name"]. " Job:"
. $row["Job"] . "<br>";
} }
else
{ echo "Can't find the record"; }
$conn->close();
?>

How to insert data in a MySql Table.
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$sql = "INSERT INTO emp (ename,job, sal) VALUES
('Amit','manager','3333')";

Contin…
mysql_select_db('dbemp');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
die('Could not enter data: ' . mysql_error());
}
echo "Entered data successfullyn";
mysql_close($conn);
?>

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Php verses MySQL

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