有人知道用PHP从MySql数据库中的两个表中获取数据的方法吗？我的android应用程序允许用户将商品放在购物车中（MySql中的表）。当用户点击应用程序中的购物车按钮时，它会加载"购物车活动"，并加载一个列表视图，其中包含他们登录后根据"会话ID"或"客户ID"添加到购物车中的所有内容。我现在要做的是，当项目添加到购物篮时，我会捕获产品ID、产品名称和图像URL、数量和价格。它工作起来既好又快。我想做的是，由于产品名称、图像url和价格已经在"产品表"中，我想做同样的事情，但当用户将项目添加到他们的购物车时，只捕获产品ID和会话ID。当客户进入购物车活动时，我希望我的PHP脚本在Shopping_Art表中获取产品ID，然后在产品表中搜索该产品ID，并返回价格、图像URL、名称等。
这是我的PHP脚本：
if($The_Function=="LOAD_CART"){
$response = array();
require_once __DIR__ . '/db_connect.php';
$con = new DB_CONNECT();
$user_session = $_GET['session'];
$user_item_status = $_GET['status'];
$order_total = 0.00;
$result = mysql_query("SELECT * FROM shopping_cart WHERE SessionID LIKE '$user_session' AND Status LIKE '$user_item_status'");
if(!empty($result)){
if (mysql_num_rows($result) > 0) {
$response["cart_contents"] = array();
//$result = mysql_fetch_array($result);
while ($row = mysql_fetch_array($result)) {
$myItems = array();
$myItems["product_id"] = $row["PID"];
$myItems["product_name"] = $row["Item"];
$myItems["product_price"] = $row["Price"];
$myItems["product_qty"] = $row["Qty"];
$myItems["image_url"] = $row["URL"];
$myItems["line_id"] = $row["ItemCount"];
$line_total = $row["Price"] * $row["Qty"];
$order_total = $order_total + $line_total;
array_push($response["cart_contents"], $myItems);
}
// success
$response["success"] = 1;
$response["order_total"] = $order_total;
// user node
// $response["products"] = array();
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
}
这是我正在尝试做的。此代码不起作用。
if($The_Function=="LOAD_CART2"){
$response = array();
require_once __DIR__ . '/db_connect.php';
$con = new DB_CONNECT();
$user_session = $_GET['session'];
$user_item_status = $_GET['status'];
$order_total = 0.00;
$result = mysql_query("SELECT * FROM shopping_cart WHERE SessionID LIKE '$user_session' AND Status LIKE '$user_item_status'");
if(!empty($result)){
if (mysql_num_rows($result) > 0) {
$response["cart_contents"] = array();
//$result = mysql_fetch_array($result);
while ($row = mysql_fetch_array($result)) {
$line_total = $row["Price"] * $row["Qty"];
$line_ID = $row["ItemCount"];
$Quantity = $row["Qty"];
$Prod_ID = $row["PID"];
$result2 = mysql_query("SELECT * FROM products WHERE pid LIKE '$Prod_ID'");
$myItems = array();
$theItem=$row["name"];
$thePrice=$row["price"];
$theImage=$row["prod_image"];
$myItems["line_id"] = $line_ID;
$myItems["product_qty"] = $Quantity;
$myItems["product_id"] = $Prod_ID;
$myItems["product_name"] = $theItem;
$myItems["product_price"] = $thePrice;
$myItems["image_url"] = $theImage;
$order_total = $order_total + $line_total;
array_push($response["cart_contents"], $myItems);
}
}
// success
$response["success"] = 1;
$response["order_total"] = $order_total;
// user node
// $response["products"] = array();
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
这就是我刚刚尝试的：
if($The_Function=="LOAD_CART2"){
$response = array();
require_once __DIR__ . '/db_connect.php';
$con = new DB_CONNECT();
$user_session = $_GET['session'];
$user_item_status = $_GET['status'];
$order_total = 0.00;
$result = mysql_query("SELECT s.*, p.* FROM shopping_cart AS s LEFT JOIN products AS p ON p.pid = s.PID WHERE s.SessionID ='$user_session' AND s.Status = '$user_item_status'");
if(!empty($result)){
if (mysql_num_rows($result) > 0) {
$response["cart_contents"] = array();
//$result = mysql_fetch_array($result);
while ($row = mysql_fetch_array($result)) {
$myItems = array();
//FROM shopping_cart Table
$line_total = $row["Price"] * $row["Qty"];
$myItems["line_id"] = $row["ItemCount"];
$myItems["product_qty"] = $row["Qty"];
$myItems["product_id"] = $row["PID"];
//FROM product TABLE
$myItems["product_name"]=$row["p.name"];
$myItems["product_price"]=$row["p.price"];
$myItems["image_url"]=$row["p.prod_image"];
}
$order_total = $order_total + $line_total;
array_push($response["cart_contents"], $myItems);
}
// success
$response["success"] = 1;
$response["order_total"] = $order_total;
// user node
// $response["products"] = array();
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
我的方案：
products TABLE
pid|name|price|created_at|prod_image|description|catagory
shopping_cart TABLE
FirstName|LastName|OrderNumber|CustomerID|Email|Price|Qty|Status|URL|PID|SessionID|CustomerType|ItemCount
您应该使用LEFT JOIN，而不是对每个项执行单独的查询。
类似于：
"SELECT s.*, p.* FROM shopping_cart AS s
LEFT JOIN products AS p ON p.pid = s.PID
WHERE s.SessionID ='$user_session' AND s.Status = '$user_item_status'
假设小写pid在products表中，大写pid在shopping_card表中。