How to cancel action when detect same line in MySQL [closed] - php

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I need PHP code to detect is that line in MySQL database table.
Thanks

Answer 1

from my understanding of your question - in your php code you can do something like this
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
$sqlSearch = "select everything from <table_name> where <column_name> = <value>;";
$result = mysqli_query($con,$sqlSearch );
if (mysqli_num_rows($result) > 0){
// do nothing
}
else{
$sqlInsert = "insert into <table_name> (column1,column2...) VALUES(value1,value2...);";
$result = mysqli_query($con,$sqlInsert);
}
?>
basically, you want to search the database to see if that row exist and if it does not you want to perform an insert query.

Answer 2

I hope this piece of code, helps you.
<?php
$variable1 = 1;
$query = "SELECT * FROM table_name WHERE column_name='$variable1'";
$result = $conn->query($query); //$conn is the connection variable
if($result->num_rows==0){
//insert into table if no duplicate tuple doesnot exist.
$insertquery = "INSERT INTO table_name (column_name) VALUES ('$variable1')";
$insertresult = $conn->query($insertquery);
}else{
//do something
}
?>