php购物车的代码

<?
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if(!$session && !$scid) {
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$session = md5(uniqid(rand()));
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SetCookie("scid", "$session", time() + 14400);
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} /* last number is expiration time in seconds, 14400 sec = 4 hrs */
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class Cart {
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function check_item($table, $session, $product) {
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$query = "SELECT * FROM $table WHERE session='$session' AND product='$product' ";
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$result = mysql_query($query);
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if(!$result) {
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return 0;
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}
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$numRows = mysql_num_rows($result);
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if($numRows == 0) {
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return 0;
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} else {
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$row = mysql_fetch_object($result);
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return $row->quantity;
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}
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}
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function add_item($table, $session, $product, $quantity) {
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$qty = $this->check_item($table, $session, $product);
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if($qty == 0) {
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$query = "INSERT INTO $table (session, product, quantity) VALUES ";
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$query .= "('$session', '$product', '$quantity') ";
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mysql_query($query);
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} else {
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$quantity += $qty;
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$query = "UPDATE $table SET quantity='$quantity' WHERE session='$session' AND ";
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$query .= "product='$product' ";
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mysql_query($query);
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}
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}
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function delete_item($table, $session, $product) {
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$query = "DELETE FROM $table WHERE session='$session' AND product='$product' ";
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mysql_query($query);
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}
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function modify_quantity($table, $session, $product, $quantity) {
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$query = "UPDATE $table SET quantity='$quantity' WHERE session='$session' ";
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$query .= "AND product='$product' ";
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mysql_query($query);
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}
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function clear_cart($table, $session) {
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$query = "DELETE FROM $table WHERE session='$session' ";
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mysql_query($query);
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}
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function cart_total($table, $session) {
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$query = "SELECT * FROM $table WHERE session='$session' ";
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$result = mysql_query($query);
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if(mysql_num_rows($result) > 0) {
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while($row = mysql_fetch_object($result)) {
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$query = "SELECT price FROM inventory WHERE product='$row->product' ";
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$invResult = mysql_query($query);
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$row_price = mysql_fetch_object($invResult);
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$total += ($row_price->price * $row->quantity);
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}
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}
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return $total;
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}
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function display_contents($table, $session) {
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$count = 0;
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$query = "SELECT * FROM $table WHERE session='$session' ORDER BY id ";
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$result = mysql_query($query);
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while($row = mysql_fetch_object($result)) {
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$query = "SELECT * FROM inventory WHERE product='$row->product' ";
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$result_inv = mysql_query($query);
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$row_inventory = mysql_fetch_object($result_inv);
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$contents["product"][$count] = $row_inventory->product;
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$contents["price"][$count] = $row_inventory->price;
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$contents["quantity"][$count] = $row->quantity;
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$contents["total"][$count] = ($row_inventory->price * $row->quantity);
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$contents["description"][$count] = $row_inventory->description;
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$count++;
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}
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$total = $this->cart_total($table, $session);
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$contents["final"] = $total;
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return $contents;
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}
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function num_items($table, $session) {
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$query = "SELECT * FROM $table WHERE session='$session' ";
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$result = mysql_query($query);
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$num_rows = mysql_num_rows($result);
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return $num_rows;
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}
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function quant_items($table, $session) {
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$quant = 0;
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$query = "SELECT * FROM $table WHERE session='$session' ";
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$result = mysql_query($query);
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while($row = mysql_fetch_object($result)) {
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$quant += $row->quantity;
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}
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return $quant;
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}
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}
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?>
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/*
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This part contains a description of how to create the tables on your mysql server.
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# MySQL dump 6.0
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#
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# Host: localhost Database: kmartShopper
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#--------------------------------------------------------
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# Server version 3.22.25
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#
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# Table structure for table 'inventory'
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#
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CREATE TABLE inventory (
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product tinytext NOT NULL,
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quantity tinytext NOT NULL,
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id int(4) DEFAULT '0' NOT NULL auto_increment,
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description tinytext NOT NULL,
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price float(10,2) DEFAULT '0.00' NOT NULL,
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category char(1) DEFAULT '' NOT NULL,
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KEY id (id),
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PRIMARY KEY (id),
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KEY price (price)
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);
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#
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# Table structure for table 'shopping'
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#
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CREATE TABLE shopping (
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session tinytext NOT NULL,
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product tinytext NOT NULL,
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quantity tinytext NOT NULL,
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card tinytext NOT NULL,
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id int(4) DEFAULT '0' NOT NULL auto_increment,
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KEY id (id),
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PRIMARY KEY (id)
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);
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*/
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Example
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<?
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include("shoppingcart.php");
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$cart = new Cart;
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$mysql_link = mysql_connect("localhost", "wwwrun", "");
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$mysql_select_db("kmartShopper", $mysql_link) /* heh, use whatever database name you put the 2 tables under in place of kmartShopper */
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?>
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/* call functions like $cart->add_item and such, see the code. */
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