Check For Existing Entry

Feb 7, 2005

I am currently trying to INSERT some data into MySQL database. What would be the correct way for checking if an entry of the same name already exist in the primary key. I was planning to do it like this.

SELECT name FROM table WHERE name = 'whatever'

Do a loop. If data is returned, prompt user that entry exist. Else, continue to INSERT.
Is this the correct way to do it? Is there a shorter way? And It is alright if I execute a lot of SQL query at one go right? What should I watch out for?


Check For Existing Entry In DB?

Jul 14, 2011

Im using PHP to parse some XML, I take 3 details from each entry in the XML - Title, Description and ID.

The ID is unique and I store the ID along with title and description in a database. Im running the parse script via CRON so to prevent duplicates I want to first check the database to see if the ID of the entry already exists in the database.

This will get my all the ID's right?

$id = mysql_query("SELECT id FROM updates");
$row = mysql_fetch_assoc($id);
if ($entry->id != $row) {
} else {
echo 'Duplicate';

Does that give me an array that I can compare the ID in the XML to?

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Feb 18, 2011

Alright,  wasn't quite sure how to summarize this in the title,  but I want to: Check if a user status is "active" or not based on the UserName input.

I have a table witch holds:

Code: [Select]VarChar Username      Var CharPassWord     int Active
Ted                        TedsPW 
something like the above(assuming it formatted correctly. In my php script I will want to input a variable for Username to check for:

inputUN in this example would be "Ted".
$UserNameToCheck = $_GET['inputUN'];

Then I want to check for that UserName in the database,  if it exists,  I want pull the value for the "Active" field for just that UserName and echo it.

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Apr 9, 2010

So I'm trying to see if an email is already registered before letting someone continue with the registration process to stop multiple accounts being linked to the same email.  I'm not sure how to do this but I was wondering if there is a way to go through the database looking for a specific email?  I'm sure there is I just don't know how to do it.

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Jul 30, 2005

I want to use my signup for to my site, but I want to check one of the entries to match a 4 digit code. This is just the entry code, I have a input box above for all of the sign-up info, including the 'code'. I want the code to be 2369 for now, so code == 2369 is the only way it'll allow them to signup. PHP Code:

        // includes
        // set up error list array
        $errorList = array();
        $count = 0;
        // validate text input fields
        if (!$username) { $errorList[$count] = "Invalid entry: Username"; $count++; }

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Check For Existing Username

Aug 30, 2001

I have a MySQL database that uses create new accounts via HTML form. I need PHP to check to see if the username of the new account already exists in the user database, if so, report a message "Username already exists, please pick another one" (for example). If the username doesn't exist, then continue adding the new user account information to the database. Below is the PHP code that is run when the form information is submitted. PHP Code:

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Mar 31, 2006

I have a database that consists of data that's imported and over written about once an hour.

In this data is customer contact info, but the info is not always current. Because this data is coming from a third party, we don't have control over updating it. What I've done is create a new table to hold updated contact info. This table does not get over written. Code:

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Jun 28, 2009

Is it possible to check an entry against a database before deciding how to process. I have a basic contact form, Name, email, message. What I would like to happen is when the user hits the submit button I want to check if the email address already exists in the database. If it doesnt I want to post the info to a new record, if it does i dont want to post anything to the database, in both instances I want to send the form to an email recipient.

If it is possible to do this please can someone either tell me where I will find a good tutorial which covers it or what search terms should I be searching for. I have tried for ages and just dont get the right results when I try to google.

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Apr 5, 2011

I have a live chat integrated into my website that uses Ajax, PHP and MySQL.

When two people have the chat window open they can chat and it works fine.

How can I send an alert to the person being requested to chat with, or for the chat.php page to popup automatically.

It prob needs to be some function constantly running in the background check the DB for new message entries.

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Jun 19, 2006

how can i check with php a table for a column. if it doesn't exist i
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May 12, 2011

I was wondering if it is possible to check for username and email existance in one query but still know which one (or both) was found. Example of two queries below.

PHP Code:
// Input sanitization, connection, etc
// Check for username
$sql = "SELECT * FROM {$dbusers} WHERE admin_user='{$form['username']}'";
$result = $db->query($sql);


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May 8, 2011

I am not sure why, but the code below doesn't check for existing username and proccesses the request. Just realized the same code has been formatted for email check and it works for email but not for username.

code for existing username check (not checking):

//Session info
$username = $_SESSION["username"];
$_SESSION["username"] = $username;
$ucheck = mysql_real_escape_string($_POST['username']);
$check3 = mysql_query("SELECT username FROM accounts
WHERE username = '$ucheck' AND NOT(username='$username')")
or die(mysql_error());


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Nov 23, 2010

Does anyone know how can I check whether the selected table in mssql is exist by php??

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Mar 29, 2009

I have the following script that adds data to a mysql table :

PHP Code:

#connects to the MySQL server
$username = "my_username";
$password  = "my_password";


I'm trying to get my script to check wether the category name already exist or not in the table. If the name already exists I want the script to choose another name because duplicate entry is not allowed.

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Apr 19, 2011

i have just find this on forum.but i cant analyze where to check the existing upload filename..

this is my script..

PHP Code:


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Nov 8, 2010

im inserting data into the table using drop-down list & multi select list,well it works very well. but i need to make sure i should not insert same StudentID & CourseID twice. here my code for you could anyone tell me pls where should i write code to check existing data?

$con = mysql_connect("localhost","root","");
if (!$con)
die('Could not connect: ' . mysql_error());
mysql_select_db("uni", $con)or trigger_error('MySQL error: ' . mysql_error());
$result  = mysql_query("SELECT * FROM student") or trigger_error('MySQL error: ' . mysql_error());
echo '<select name="sid">';


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Using symfony framework, which code is best to query database table to check if entry is already there?

I need query like this:

$q = $this->createQuery('t')
->where(' = ?', $email)
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I am trying to check if any data in any existing row/rows was updated ( not checkng for new row) so I try using the mysql_affected_rows(), however regardless of updates within an existing row it keeps showing "no updates" (I know updates were passed) I simplyfied the echo wordings but the skeleton script is the same

$num = mysql_affected_rows($sql, $conn);

if ($num == 0) {

echo "<p>No update yet!</p>";

} else {

echo $num;
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I am trying to check MYSQL table field for existing Tags. If they exist i dont want it to insert the tag.

If they dont exist i want it to run the INSERT query. My code below wont work though.. it just keeps returning already exists even when the tag dosent exist in the table.

//make variables safe
$tagname = mysql_real_escape_string($_POST['tag']);
$status = 0;
$new = 1;
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$sql1 = "SELECT tag_name FROM Tags";
$result1 = mysql_query($sql1);
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I have a cronjob that calls a script. In this script, I want to use my class to check if the url exists, and if it doesn't, delete the entry in the database. Something like this:

foreach row in table, if (Security::checkUrl(team_url)), delete entry. else: update xml.

How can I do something like this? I don't need help with the url verification only the mysql query and how i should go through each row and delete the rows where the url is invalid.

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For creation i used say

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How do i do this during editing, say I need to select 'Health' which is available in the variable $row['course detail']

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I'm looking for an easy method to implement an 'entry form' for an online competition on my website (a competition page, if you like).

As I am running a 'trade promotion' I will need to apply for a trade permit license, therefore will need to satisfy the local authorities that the entry form and drawing method are acceptible.

The competition page will feature the prize on offer and the fields for entrants to fill in their details.

The tricky part I think is that I then require the entries to be able to be 'drawn randomly' once the competition has ended. Any tips here on how to successfully and easily run a competition from your site?

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How can I create a function to see if this entry has a link within it? Can someone get me started? Pretty much, I want the function to find any <a, <a href or any other related link instances within a string. I'd prefer not to throw the entry into an array.

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Based on my loop structure, how am I be able to store those entry on my database. Can anyone help me please.

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HTML Code:

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I'm getting the following error:Duplicate entry 'ahamzaoui_v2' for key 'Username' in /opt/lampp/htdocs/webEchange/SiteWeb_V5/dupliquerCompte2.php on line 135when running a php script. I've tried it many times but I don't know why I'm getting this error.Here is the code around line 135:$sql = "UPDATE utilisateur SET Username = '" . ysql_real_escape_string($infos['Username']) . "2', MotDePasse = '" . sql_real_escape_string($infos['MotDePasse']) . "2' WHERE Matricule = " . fos['Matricule'];line 135 -> if(mysql_query($sql))as you can see, I'm trying to append a 2 to the existing value for Username.Here is what I don't understand. If I go have a look at the utilisateur table, I can't find any entry with the value ahamzaoui_v2.Then I try running the script, and I get the error! The funny thing is, after the script has run (and reported an error), the value is changed! I now have ahamzaoui_v2 instead of ahamzaoui_v. The problem is that the REST of the script is not executed so I only get a part of what I want (a small part).Apart from a SELECT statement, this is the first query I run, so I really can't see how there can be a duplicate entry, espectially since I just checked for that before.upon reading this thread, I tryed running check table utilisateur, but it revealed no errors whatsoever..btw, if I run the script many times in a row, I always get the error, and the username ends up with a whole lot of 2's appended to it (ahamzaoui_v222)

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