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?

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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) {
Insert
} else {
echo 'Duplicate';
}

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

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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 
              1
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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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:

<?
    }
    else
        {
        // includes
        include("dbconex.php");
        // 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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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.

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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

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

[Code]...

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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());

[Code]....

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Mar 29, 2009

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

PHP Code:

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

[Code].....

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:
<?php
session_start();
//var_dump($_POST);
include_once("conn.php");
$ran=rand();

[Code]...

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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?

<?php
$con = mysql_connect("localhost","root","");
if (!$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">';

[Code]...

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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('t.email = ?', $email)
->andWhere('t.type = ?','newsletter');

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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;
echo "<p>Updated!</p>";

}

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//make variables safe
$tagname = mysql_real_escape_string($_POST['tag']);
$status = 0;
$new = 1;
//get existing tagnames first
$sql1 = "SELECT tag_name FROM Tags";
$result1 = mysql_query($sql1);
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[Code]...

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I'm wondering what would be the most efficient way of achieving this?

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For creation i used say

<p><b>Category:</b>&nbsp;&nbsp;&nbsp;<select name="category">
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The competition page will feature the prize on offer and the fields for entrants to fill in their details.

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HTML Code:
<html>
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