通过在列中插入相同的值来“插入SQL”

Question

I have a bidding system that works with a robotic bidding automatic, and also with a button where the customer can bid.

When the client clicks the button, it calls a function that executes the following query:

$qryins = "Insert into bid_account (user_id,bidpack_buy_date,bid_count,auction_id,product_id,bid_flag,bidding_price,bidding_type,bidding_time)
                values('$uid',NOW(),'1','$aid','$prid','d',$newprice,'s'," . $oldtime . ")";

This query is in a PHP file.

The part of robotic is done by a procedure in the database, with the following command, which runs every second:

Insert into bid_account (user_id, bidpack_buy_date, bid_count, auction_id, product_id, bid_flag, bidding_price, bidding_type, bidding_time)
        SELECT prox_user_id, NOW(), '1', auctionID, productID, 'd', prox_valor, 's', auc_due_time FROM t_autolances
        WHERE prox_valor NOT IN (SELECT bidding_price FROM bid_account WHERE auction_id=auctionID); 

Bids are run with a timer, equal to those auctions of cents. The problem that is occurring is that if the customer clicks the button at the same time that the robo gives the bid, it writes to the database with equal values.

I need it to write the different value to the " bidding_price " column, like this:

I need it written this way:

robot 0.25
customer 0.26

and not like this:

robot 0.25
client 0.25

I did not want to put all the code here because it is too long, so I put the most important parts.

$q = "select * from auc_due_table adt left join auction a on adt.auction_id=a.auctionID left join auction_management am on a.time_duration=am.auc_manage where auction_id=$aid";
$r = mysqli_query($db, $q);
$ob = mysqli_fetch_object($r);

$oldtime = $ob->auc_due_time;
$oldprice = $ob->auc_due_price;
$plusprice = $ob->auc_plus_price;
$plustime = $ob->auc_plus_time;
$newprice = $ob->pennyauction == 1 ? $oldprice + 0.01 : $oldprice + $plusprice;
$newtime = $oldtime < $plustime ? $plustime : $oldtime;

Answer 1

maybe this:

   Insert 
       into bid_account 
                     (
                     user_id, 
                     bidpack_buy_date, 
                     bid_count, 
                     auction_id, 
                     product_id, 
                     bid_flag, 
                     bidding_price, 
                     bidding_type, 
                     bidding_time
                     )
             SELECT 
                     prox_user_id, 
                     NOW(), 
                     '1', 
                     auctionID, 
                     productID, 
                     'd', 
                     (SELECT max(bidding_price)+0.01 FROM bid_account WHERE auction_id=auctionID) AS bidding_price,                     
                     's', 
                     auc_due_time 
             FROM 
                     t_autolances
             LIMIT 1

Answer 2

You need to do the addition of the user's amount in SQL, not in PHP.

$qryins = "Insert into bid_account (user_id,bidpack_buy_date,bid_count,auction_id,product_id,bid_flag,bidding_price,bidding_type,bidding_time)
            SELECT '$uid', NOW(),'1', auction_id, '$prid','d', 
                    auc_due_price + IF(pennyauction, 0.01, auc_plus_price), 's', auc_due_time
            from auc_due_table adt 
            left join auction a on adt.auction_id=a.auctionID 
            left join auction_management am on a.time_duration=am.auc_manage 
            where auction_id=$aid";

The other solution is to use a transaction. Start the transaction before the SELECT query, and commit it after the INSERT .

mysqli_query($db, "START TRANSACTION");
$r = mysqli_query($db, $q);
$ob = mysqli_fetch_object($r);
$oldtime = $ob->auc_due_time;
$oldprice = $ob->auc_due_price;
$plusprice = $ob->auc_plus_price;
$plustime = $ob->auc_plus_time;
$newprice = $ob->pennyauction == 1 ? $oldprice + 0.01 : $oldprice + $plusprice;
$newtime = $oldtime < $plustime ? $plustime : $oldtime;
$qryins = "...";
mysqli_query($db, $qryins);
mysqli_query($db, "COMMIT");