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  • Finding Duplicate Records in MySQL using PHP

    August 29, 2013

    Below is code to test if the record is already exist in the MySQL database.

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    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
 
<!--?php 
$id = $_REQUEST['id'];
$first_name = strtoupper($_REQUEST['first_name']);
$last_name = strtoupper($_REQUEST['last_name']);
 
$connet=mysql_connect("localhost","root","") or die(mysql_error());
$db=mysql_select_db("student") or die(mysql_error());
 
// Code for checking if the text field is empty using
// different conditions
 
$id_no = (empty($id));
$first_name2 = (empty($first_name)) ;
$last_name2 = (empty($last_name));
 
if ($id_no == true &#038;&#038; $first_name2 == true
&#038;&#038; $last_name2 == true)
{
echo "<h1--> Please filled out the form correctly!";
}
else if ($first_name2 == true &amp;&amp; $last_name2 == true)
{
echo "

    Both first name and last name is not filled out correctly!

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    ";
}
else if ($id_no == true &amp;&amp; $first_name2 == true)
{
echo "

    Both ID No. and First Name is not filled out correctly!

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    ";
}
else if ($id_no == true &amp;&amp; $last_name2 == true)
{
echo "

    Both ID No. and Last Name is not filled out correctly!

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    ";
}
 
else if ($id_no == true)
{
echo "

    The student ID No. is not filled out correctly!

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    ";
}
else if ($first_name2 == true)
{
echo "

    The student first name is not filled out correctly!

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    ";
}
else if ($last_name2 == true)
{
echo "

    The student last name is not filled out correctly!

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    ";
}
 
// Code for checking for duplicate record in the database
// for the first name and the last name of the student.
 
else if (mysql_num_rows(mysql_query("SELECT first_name,last_name
FROM info WHERE first_name = '$first_name' AND
last_name = '$last_name'"))) {
echo "

     

    Sorry Duplicate Record for ”
    .$first_name. ” ” .$last_name. “. “;
    echo “

     

    Please Try Again. “;

    }
    else {
    $sql = “INSERT INTO info(id,first_name,last_name)
    VALUES (‘$id’,'$first_name’,'$last_name’)”;
    $query = mysql_query($sql) or die(mysql_error());
    echo ”

     

    The record of ”
    .$first_name. ” ” .$last_name.
    ” has been saved in the database.”;
    }
    ?>

     

     

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