chasdrury Posted September 29, 2006 Share Posted September 29, 2006 Hi guysI have created the following PHP script which works perfectly - sends name, phone and email to a mySQL database. What I need to do it somewhere put in a command that checks the Database for duplicate email entries - The email sends out discount details for the shop so we only want to send one per email address. Is this possible? How would I go about doing this?CheersChas[code]$name=$_POST['requiredname'];$phone=$_POST['requiredphone'];$email=$_POST['requiredemail'];$from = "[email protected]";$subject = "Hair Kandi Discount Voucher";mysql_connect(localhost,$username,$password);@mysql_select_db($database) or die( "Unable to select database");$query = "INSERT INTO contacts VALUES ('','$name','$phone','$email')";mysql_query($query); //begin message $message = <<<EOF<html> <body bgcolor="#333333">[/code] Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/ Share on other sites More sharing options...
chris9902 Posted September 29, 2006 Share Posted September 29, 2006 it's been a long time since I've done any PHP coding so if it doesn't work... sorry.[code]$check = mysql_query("SELECT email FROM contacts");$result = mysql_fetch_array($check);foreach ($result as $i){ if ($i == $_POST['requiredemail']) { exit("dupe"); }}[/code]what this *should* do is select all the "email" fields from "contacts" and store them in a new array.then the foreach() loops through them one by one and check them against $_POST['requiredemail'].it's a $i matches $_POST['requiredemail'] it will exit().you can tidy this up a bit so it could print an error message or something. Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100765 Share on other sites More sharing options...
Barand Posted September 29, 2006 Share Posted September 29, 2006 This query will tell you which email addys are duplicated[code]SELECT email, COUNT(*) as adcountFROM contactsGROUP BY emailHAVING adcount > 1[/code]Once you have got rid of the duplicates, put a unique index on email column to prevent further duplication Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100766 Share on other sites More sharing options...
chasdrury Posted September 29, 2006 Author Share Posted September 29, 2006 [quote author=chris9902 link=topic=109942.msg443592#msg443592 date=1159526134]it's been a long time since I've done any PHP coding so if it doesn't work... sorry.[code]$check = mysql_query("SELECT email FROM contacts");$result = mysql_fetch_array($check);foreach ($result as $i){ if ($i == $_POST['requiredemail']) { exit("dupe"); }}[/code]what this *should* do is select all the "email" fields from "contacts" and store them in a new array.then the foreach() loops through them one by one and check them against $_POST['requiredemail'].it's a $i matches $_POST['requiredemail'] it will exit().you can tidy this up a bit so it could print an error message or something.[/quote]Thanks. Where would the code go in my PHP then, just with all the other code? The database is currently empty - what I want to do is stop duplicates from appearing. Is this how to do it?Chaz Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100768 Share on other sites More sharing options...
chris9902 Posted September 29, 2006 Share Posted September 29, 2006 if your DB is empty I would use Barand's example and set unique key in your DB.if you want to use my code then you should put it somewhere before you send the message or add anything to your DB.no point error checking afterwards is it ;) Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100769 Share on other sites More sharing options...
Barand Posted September 29, 2006 Share Posted September 29, 2006 Chris9902,Afraid that code won't work. It fetches all email address but only checks the first one.Better to look for the specific email address being entered to see if any there already[code]<?php$check = mysql_query("SELECT COUNT(*) FROM contacts WHERE email = '$email' ");if (mysql_result ($check, 0) > 0) { // error - email exists}else { // insert code can go here}?>[/code] Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100773 Share on other sites More sharing options...
chris9902 Posted September 29, 2006 Share Posted September 29, 2006 ;) told you it had been a long time.man I need some books. Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100775 Share on other sites More sharing options...
chasdrury Posted September 29, 2006 Author Share Posted September 29, 2006 Thanks guys. I have inputted this into the insert.php script and it still doesn't work. It lets through any email, whether or not they are in the database. The only difference now is that I have put a unique identifier in the email list in the SQL, so the data isn't written to the database, but the people still get the auto email discount thing, since no error is kicked up. My PHP is below (I have copied in everything upto the start of the discount email)[code]<?$username="xxx";$password="xxx";$database="xxx";$name=$_POST['requiredname'];$phone=$_POST['requiredphone'];$email=$_POST['requiredemail'];$from = "[email protected]";$subject = "Hair Kandi Discount Voucher";mysql_connect(localhost,$username,$password);@mysql_select_db($database) or die( "Unable to select database");$check = mysql_query("SELECT COUNT(*) FROM contacts WHERE email = '$email' ");if (mysql_result ($check, 0) > 0) { // error - email exists}else {}$query = "INSERT INTO contacts VALUES ('','$name','$phone','$email')";mysql_query($query); //begin message $message = <<<EOF<html> <body bgcolor="#333333"><table width="511" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <tr> <td width="511" height="113" valign="top"><img src=[/code]What am i doing wrong!!!??Chaz Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100780 Share on other sites More sharing options...
Barand Posted September 29, 2006 Share Posted September 29, 2006 [code]else {}[/code]The processing (if no dupes) needs to be inside the else {}[code]<?phpif (mysql_result ($check, 0) > 0) { // error - email exists echo "Email exists in file<br/>";}else { $query = "INSERT INTO contacts VALUES ('','$name','$phone','$email')"; mysql_query($query); //begin message $message = <<<EOF <html> <body bgcolor="#333333"> <table width="511" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <tr> <td width="511" height="113" valign="top"><img src= ... ...}?>[/code] Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100793 Share on other sites More sharing options...
chasdrury Posted September 29, 2006 Author Share Posted September 29, 2006 Thanks very much, works perfectly now!Chaz Link to comment https://forums.phpfreaks.com/topic/22475-check-for-duplicates-in-mysql-using-php/#findComment-100797 Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.