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Disable textbox in mysql when duplicate record is inserted
In my mysqli code when i try to insert a duplicate value in a textbox it should show me a message as "this field already exists" and it should not allow me to submit the form.
I don't want to delete the existing record. It is fine if I delete it.
Is there any function available in mysqli to achieve this?
A:
The easiest way would be to use a unique constraint on your column and abort the insertion if the constraint is violated.
For example, if you add a unique key constraint on your table's autoincrement primary key, if the insertion is not unique, an error will be thrown to the user.
A:
To get this to work you need to set MYSQL_INSERT_ERRNO to something other than 1062 (duplicate key).
You can also set it to different code like MYSQL_ERR_LOCKED_BY_OTHER_THREAD.
This means that the only error that will be returned is if an error occurs. Other insert failures will be ignored and MYSQL will rollback the transaction. This has the downside that you need to catch the error using a transaction.
$con = new mysqli($host, $user, $password, $database, $port);
$con->set_charset('utf8');
$con->query('SET MYSQL_INSERT_ERRNO=1062');
$con->query('SET MYSQL_INSERT_LOCK_THRESHOLD=500');
$con->query('SET MYSQL_INSERT_ERROR=MYSQL_ERR_LOCKED_BY_OTHER_THREAD');
$result = $con->query('INSERT INTO table_ ac619d1d87
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