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PHP releases Finalization If a user is adding items to his car ready, he usually goes to a purchase. Fill a command requires several steps to check whether enough stock available to complete the order is the conversion of the shopping cart to order less the wines sold from the inventory. These tasks require the closure of the database and examples of relatively complex query processing. To order the script. 3 shown in Example 12-1 performs these tasks. The script works as follows: It checks whether the user is connected and that the basket a. These tests should never miss the buy button only appears when the user views the car is registered and the basket of a website. If one test fails, an error is recorded and the script allows the caller script. The inventory, objects, paintings and controls are locked for writing, and users and clients to read the tables are locked. The inventory items and tables are updated every command in the procurement process, and they must be locked, because the inventory is first checked to ensure that sufficient quantities of wine are available and will be updated later. Without a guarantee, it is possible for another user to buy the wine, while the script is run, which sold more wine than in the camp. This is an example of the dirty read problem in Chapter 6 deals with competition and lock should be used to avoid the problem. Each item in the basket is then processed and inventory is checked to ensure that the wine is sufficient. If a wine is, the count () of the online inventory appropriate zero an error message is recorded. Similarly, if less wine will be available to the user, the sum () on_hand the amount of matching lines, unless the user basket is a piece of recorded errors. If an error occurs, the script also updates the location of the user so that the quantity (amount) of wine in the basket of the user matches the quantity on_hand. In the case of an error, the script uses showWine () to show the user the details of the wine. This function opens a separate connection to the DBMS, so that the wine_variety wine, a vineyard and tables grape_variety should not be locked for reading in order. If verification of inventories, to be successful, the script to convert user made an order from a customer. This process is simple: Determine the cust_id from the session variable user login name with the function getCustomerID (). Find the maximum for this client order_id. Updating order and online articles by replacing the cust_id of -1 with the client and the order_id cust_id with the next order_id available for this client. After the database is updated, the cart is emptied session_unregister () to the session variable order_no deleted. After the order is completed and verified the inventory, the script ends the ordering process by reducing the inventory. This can never fail, since all the necessary tables are locked, and you have verified that sufficient quantities are available. The process is similar to the review of the cart: They go through each item and for anyone to upgrade the inventory. Stocks are processed from the oldest to youngest. Consider an example in which the user wants to buy 24 bottles of wine. There are two surveys of wine: the first with 13 bottles and has been added to May 2000, the second with 25 bottles and was taken in September 2001. emptied to fill the order, the oldest stock of 13 bottles and will be deleted, and the second survey will be reduced from 11 bottles. With the process completed, the tables are unlocked. If there are no errors, the script directs the expedition. A script to confirm the order and pass the order_id cust_id and as a method to get parameters. If something goes wrong, the user on the shopping cart page is returned. Example 12-1. . Order 3 Completes Acquisition of the user , $ available) (if (session_register (“message”)) session_register message (“message”) if ($ available == 0) $. = “Sorry, we have to sell to. showWine ($ cartRow [winesInCart $] ["wine_id"], NULL). “
N” else $ message. = “Sorry, we did that. on_hand $ [" SUM (on_hand) "].” bottle ” on the left. showWine ($ cartRow [winesInCart $] ["wine_id"], NULL). “
N” / / Update the user to match the amount / / amount available $ query = ” UPDATE Articles SET qty = ‘$. Disposal. “WHERE cust_id = -1 order_id = $ order_no AND item_id =”. CartRow [winesInCart $ $] ["item_id"] if ((@ mysql_query ($ query, $ connection) )) show ();)) error / / $ for winesInCart 0) (/ / Get the oldest inventory $ row = @ mysql_fetch_array ($ result) / / Is there more wine in this directory like / / if the user wants ($ row ["on_hand" currentRow]> $ ["Qty "]) (/ / reduce the inventory by the amount / / user has ordered $ query =” UPDATE SET = consisted on_hand on_hand – “. $ currentRow [" Qty "].” WHERE wine_id = “. currentRow $ ["wine_id"]. “ET inventory_id =”. $ row ["inventory_id"] / / The user should no longer / / wine $ currentRow ["Qty"] = 0) else (/ / Remove the inventory – we sold the / / rest of this user $ query = “DELETE FROM inventory WHERE wine_id =”. $ currentRow ["wine_id"]. “ET inventory_id =”. $ row ["inventory_id"] / / This reduced inventory, Client / / required quantities of 1, but / / we process more inventory to $ currentRow ["Qty"] -= $ row ["on_hand"]) / / UPDATE or DELETE if the inventory (! (@ mysql_query ($ query, $ connection message))) show error else $ ();))). = “N
quantities in the basket.” “Have updated n.” / / Finally, UNLOCK tables $ query = “UNLOCK TABLES” if ((@ mysql_query ($ query, $ connection))) error show () / / Redirect to the confirmation e-mail page when / / all goes well / / (supply and CustID orderID script) / / else return to the side and display a message if (empty ($ message)) (header (“Location: eg. Express. php first?”. “CustID = $ = $ custid & orderID newOrder_no “) output;;) else header (” Location: eg. basket. “);?> second-php PHP Tutorial

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