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Python mysql check for duplicate before insert


Python mysql check for duplicate before insert

By : user3861329
Date : November 19 2020, 07:01 PM
wish helps you You can either find out whether it's in there first, by SELECTing by url, or you can make the url field unique:
code :


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How to check if tow columns are duplicate when INSERT data in MySQL?

How to check if tow columns are duplicate when INSERT data in MySQL?


By : shm
Date : March 29 2020, 07:55 AM
Hope that helps You can also create a stored procedure and check if the file_id already exists or not:
code :
drop if procedure exists check_user_files;
create procedure check_user_files
(
    in p_file_id smallint
)
begin
    declare v_success tinyint unsigned default 0;

    if not exists (select 1 from user_files where file_id = p_file_id) then

        [....] -- insert statement

    else

        [....] -- remove or update

    end if;

    select v_success as success;
end;
mysql insert on duplicate key update, check which one occurred

mysql insert on duplicate key update, check which one occurred


By : user2252359
Date : March 29 2020, 07:55 AM
will be helpful for those in need From the PHP manual mysql_affected_rows :
MySQL/PHP check for duplicate before INSERT

MySQL/PHP check for duplicate before INSERT


By : Martin Slade
Date : March 29 2020, 07:55 AM
Hope this helps Your code creates a race condition if two people attempt to create the same ame at the same time and you're not handling the fallout properly.
If you have set the SERVER_NAME column to UNIQUE then you needn't check for the existence of a server name before you perform your INSERT as MySQL will do that for you. Use INSERT IGNORE ad check the number of affected rows after the query has executed to find out if it worked:
code :
//Create connection to database using mysqli
$conn = new mysqli($dbhost, $dbuser, $dbpass, $db);

//Set variables according to user input on previous form
$Server_Name = $_POST['Server_Name'];

//Define the INSERT statement with IGNORE keyword
    $stmt = "INSERT IGNORE INTO dcr_master (Server_Name, Description,..., ... , ... )";
    if ($conn->query($stmt) === false) {
        die("Database error:".$conn->error);
    }

// Check for success
    if ($conn->affected_rows == 0) {
        print "<br>Error! <p></p>";
        echo "" . $Server_Name . " already exists in the DCR";
        print "<p></p>Please check the Server Name and try again";
    } else {

//Success and return new id
        echo "<br><p></p>Record Added!<p></p>";
        echo "New id: " . $conn->insert_id;
    }
PHP to insert data (with duplicate check) to MySQL not working

PHP to insert data (with duplicate check) to MySQL not working


By : adhi
Date : March 29 2020, 07:55 AM
this one helps. I want to check for a duplicate before I insert data to my table. , Check the change that is stated by comment and try this:-
code :
<?php

$username='abc@xyz.com';

$success = false;

try {

     $con = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
     $con->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
     $sql = "INSERT INTO tbl_profileavatars (user_name,img_src) VALUES (:contactname,:imagepath) ON DUPLICATE KEY UPDATE user_name=:contactname,img_src =:imagepath";

     $stmt = $conn->prepare($sql);
     error_log("\n statemt prepared".$stmt, 3, "logs/my-errors.log");
     // do change like this because when you want to pass multiple value 
     // then you need to pass in form of array
     $stmt->execute(array(':contactname'=>$username,':imagepath'=>$cropped)); 
     //($stmt);
     $success = true;
     return "Thank you for contacting us .Our representatives will getback to you within 24 hours <br/> <a href='contact.php'>go back</a>";

    }catch( PDOException $e ) {
      print_r ( $e );
      error_log("\n exception \n".$e, 3, "logs/my-errors.log");
      return $e->getMessage();
    }
?>
Insert Batch php mysql with check duplicate and sum values of field duplicate

Insert Batch php mysql with check duplicate and sum values of field duplicate


By : user2472083
Date : March 29 2020, 07:55 AM
With these it helps Good option will to pass only data to DB that you want to insert. All the data cleaning task can be done in controller.
code :
// Create a data array and add all info
$data = [];
//if user does not exist add it in array
if (empty($dt_exist($id))) {
  $data[$ID_USER] = array(
                  'COA_CODE' => $key['COA_CODE'],
                  'AMOUNT' => $amount,
                  'MODUL' => $modul,
                  'USER_ID' => $ID_USER
                  );
}
else {
      //if user exist in $data just modify the amount
      if (!empty($data[$ID_USER])) {
        $data[$ID_USER]['AMOUNT'] += $dt_exsis['AMOUNT']; 
     }
      else {
        // if user does not exist in data create add all info
        $data[$dt_exsis['ID_USER']] = array(
                  'COA_CODE' => $dt_exsis['COA_CODE'],
                  'AMOUNT' => $dt_exsis['amount'],
                  'MODUL' => $dt_exsis['modul'],
                  'USER_ID' => $dt_exsis['ID_USER']
                  );
    }
}
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