连接两个表以进行删除

时间：2015-09-16 10:05:53

标签： php mysql

我有两张桌子，tb_empgrocery是父，tb_empgroc_master是孩子。一个客户的每个订单都保存到数据库表 - tb_empgrocery，然后tb_empgroc_master计算并输出客户订购的项目总数和总金额。

这是tb_empgrocery

的表格 
empgrocID     order_no          date_ordered     item_no  qty_ordered  unit_price   amount
    1     15-09-0000000001  2015-09-16 17:24:36   40933         2         65.00     130.00
    2     15-09-0000000001  2015-09-16 17:24:36   40935        43          4.07     175.01
    3     15-09-0000000001  2015-09-16 17:24:36   40934        23          4.07      93.61

适用于tb_empgroc_master 

empgrocmstID     order_no          date_ordered     total_items  total_amount  order_status
    1        15-09-0000000001  2015-09-16 17:24:36       3          398.62        Pending

正如您所看到的，tb_empgroc_master计算了客户表格tb_empgrocery订购的所有商品。 order_no连接这两个表

这是我的两个表的代码

case "Add":
    $itemno = $_POST['itemno'];
    $qty = $_POST['qty'];
    $unitprc = $_POST['unitprc'];
    $amt = $_POST['amt'];
    $coopmemid = $_SESSION['kiosk']['is_coopmemID_kiosk'];
    $totamt = 0;
    $totitm = count($itemno);
    $a_empgroid = array();
    for($x=0; $x<$totitm; $x++) {
        $Addquery = "INSERT INTO tb_empgrocery (coopmemID , date_ordered, item_no, qty_ordered, unit_price, amount) 
                    VALUES ('$coopmemid',(NOW()),'$itemno[$x]','$qty[$x]','$unitprc[$x]','$amt[$x]')";
        $atecCoop->query($Addquery);
        $totamt+=$amt[$x];
        $inserted_id = $atecCoop->insert_id;
        array_push($a_empgroid,$inserted_id);
    }
    $Savequery = "INSERT INTO tb_empgroc_master (order_status, date_ordered, total_items, total_amount) VALUES ('Pending', (NOW()), '$totitm', '$totamt')";
    $atecCoop->query($Savequery);
    $empgrocmstid = $atecCoop->insert_id;
    $orderno = date('y-m-').str_pad($empgrocmstid, 10, "0", STR_PAD_LEFT);
    $sql = "UPDATE tb_empgroc_master SET order_no='$orderno' WHERE empgrocmstID='$empgrocmstid'";
    $atecCoop->query($sql);
    foreach($a_empgroid as $empgrocid) {
        $sql = "UPDATE tb_empgrocery SET order_no='$orderno' WHERE empgrocID='$empgrocid'";
        $atecCoop->query($sql);
    }
break;

这是我的删除查询... 

case "Delete":
    $Deletequery = "CREATE TRIGGER update_tb_empgrocery AFTER UPDATE ON tb_empgrocery FOR EACH ROW
                    BEGIN
                        UPDATE tb_empgroc_master
                        INNER JOIN
                        (
                            SELECT order_no, SUM(amount) AS total_amount, COUNT(empgrocID) AS total_items
                            FROM tb_empgrocery
                            GROUP BY order_no
                        )
                            SET tb_empgroc_master.total_items = tb_empgrocery.total_items,
                            tb_empgroc_master.total_amount = tb_empgrocery.total_amount
                            WHERE tb_empgroc_master.order_no = NEW.order_no;

                            DELETE FROM tb_empgroc_master WHERE empgrocmstID='".$_POST['empgrocmstID']."';

                    END;
                    DELIMITER";
    $atecCoop->query($Deletequery);

我的问题是当我删除tb_empgrocery中的一个项目时，tb_empgroc_master没有更新。它必须更新total_items，它将变为2和total_amount（如果我删除了tb_empgrocery中的其中一个项目）。

感谢您的帮助。

PHP代码

<?php
    if(!session_id()){
        session_start();
    }
    include_once '../fileadmin/dbinit.php';
    $todo = $_POST['todo'];
//    $con = mysql_connect("localhost","root","","atec_coop");
//    if (!$con){
//        die("Can't connect".mysql_error());
//    }
    mysql_select_db("atec_coop",$con);
    switch ($todo) {
        case "display":
            $sql = "SELECT * from tb_empgroc_master";
//            $myData = mysql_query($sql,$con);
            $result = $atecCoop->query($sql);
//            mysql_close($con);

            $html = ''; $ctr = 0;
            if ($result->num_rows){
                while ($row = $result->fetch_object()){
                $id = $row->empgrocmstID;
                $date_ordered = date("m-d-Y");
                $order_no = date($row->order_no);
                $total_items = number_format($row->total_items);
                $total_amount = number_format($row->total_amount,2);
                $order_status = wordwrap($row->order_status);
                $Order = $row->empgrocmstID;

                $html .= "<tr id='$id'>";
                $html .= "<td class='date_ordered' style='text-align:center'>$date_ordered</td>";
                $html .= "<td class='order_no' style='text-align:center'>$order_no</td>";
                $html .= "<td class='total_items' style='text-align:right'>$total_items</td>";
                $html .= "<td class='total_amount' style='text-align:right'>$total_amount</td>";
                $html .= "<td id='$Order' class='order_status' style='text-align:center'>$order_status</td>";
                $html .= "</tr>";
                }
            }
            echo $html;
        break;
        case "Cancel":
            $Cancelquery = "UPDATE tb_empgroc_master SET order_status='Cancelled' WHERE empgrocmstID='".$_POST['empgrocmstID']."'";
            $atecCoop->query($Cancelquery);
        break;
        case "ApprovePartial":
            $sql = "SELECT * from tb_empgroc_master";
//            $myData = mysql_query($sql,$con);
            $result = $atecCoop->query($sql);
//            mysql_close($con);

            $html = ''; $ctr = 0;
            if ($result->num_rows){
                while ($row = $result->fetch_object()){
                $id = $row->empgrocmstID;
                $date_ordered = date("m-d-Y");
                $order_no = date($row->order_no);
                $total_items = number_format($row->total_items);
                $total_amount = number_format($row->total_amount,2);
                $order_status = wordwrap($row->order_status);
                $Order = $row->empgrocmstID;

                $html .= "<tr id='$id'>";
                $html .= "<td class='date_ordered' style='text-align:center'>$date_ordered</td>";
                $html .= "<td class='order_no' style='text-align:center'>$order_no</td>";
                $html .= "<td class='total_items' style='text-align:right'>$total_items</td>";
                $html .= "<td class='total_amount' style='text-align:right'>$total_amount</td>";
                $html .= "<td id='$Order' class='order_status' style='text-align:center'>$order_status</td>";
                $html .= "</tr>";
                }
            }
            echo $html;

            $ApprovePartialquery = "UPDATE tb_empgroc_master SET order_status='Partially Delivered' WHERE empgrocmstID='".$_POST['empgrocmstID']."'";
            $atecCoop->query($ApprovePartialquery);
        break;
        case "Approve":
            $Approvequery = "UPDATE tb_empgroc_master SET order_status='Delivered' WHERE empgrocmstID='".$_POST['empgrocmstID']."'";
            $atecCoop->query($Approvequery);
        break;
        case "Delete":
            $Deletequery = "DELETE FROM tb_empgroc_master WHERE empgrocmstID='".$_POST['empgrocmstID']."'";
            $atecCoop->query($Deletequery);
        break;
    }
?>

1 个答案:

答案 0 :(得分：0)

MySQL支持触发器。这些是您可以编写的函数，这些函数在插入/更新/删除记录时执行。你需要其中一个。

当在 tb_empgrocery 上更新记录时，您将使用类似此示例的内容来触发触发器，然后更新主表上该图表的数字。

CREATE TRIGGER `update_tb_empgrocery` AFTER UPDATE ON `tb_empgrocery` FOR EACH ROW
BEGIN
    UPDATE tb_empgroc_master a
    INNER JOIN
    (
        SELECT order_no, SUM(amount) AS total_amount, COUNT(empgrocID) AS total_items
        FROM tb_empgrocery
        GROUP BY order_no
    ) b
    SET a.total_items = b.total_items, 
    a.total_amount = b.total_amount
    WHERE a.order_no = NEW.order_no;
  END;;

DELIMITER ;

请注意，很少有人使用它们，这可能会导致问题。如果将来代码存在问题，很可能是大多数人都不会想到的问题。

修改

以下是创建所需3个触发器的代码。第一行 DELIMITER // 只是从a更改默认分隔符;至 //。这样每条线在创建时不会作为语句执行，而是被视为创建触发器函数的代码。

首先创建一个在更新tb_empgrocery上的现有记录时触发的触发器

DELIMITER //
CREATE TRIGGER `update_tb_empgrocery` AFTER UPDATE ON `tb_empgrocery` FOR EACH ROW
BEGIN
    UPDATE tb_empgroc_master a
    LEFT OUTER JOIN
    (
        SELECT order_no, SUM(amount) AS total_amount, COUNT(empgrocID) AS total_items
        FROM tb_empgrocery
        GROUP BY order_no
    ) b
    ON a.order_no = b.order_no
    SET a.total_items = COALESCE(b.total_items, 0), 
    a.total_amount = COALESCE(b.total_amount, 0)
    WHERE a.order_no = NEW.order_no;
  END;

接下来创建一个触发器，当新记录插入tb_empgrocery时触发该触发器。

DELIMITER //
CREATE TRIGGER `insert_tb_empgrocery` AFTER INSERT ON `tb_empgrocery` FOR EACH ROW
BEGIN
    UPDATE tb_empgroc_master a
    LEFT OUTER JOIN
    (
        SELECT order_no, SUM(amount) AS total_amount, COUNT(empgrocID) AS total_items
        FROM tb_empgrocery
        GROUP BY order_no
    ) b
    ON a.order_no = b.order_no
    SET a.total_items = COALESCE(b.total_items, 0), 
    a.total_amount = COALESCE(b.total_amount, 0)
    WHERE a.order_no = NEW.order_no;
  END;

最后创建一个在删除tb_empgrocery上的现有记录时触发的触发器。

DELIMITER //
CREATE TRIGGER `delete_tb_empgrocery` AFTER DELETE ON `tb_empgrocery` FOR EACH ROW
BEGIN
    UPDATE tb_empgroc_master a
    LEFT OUTER JOIN
    (
        SELECT order_no, SUM(amount) AS total_amount, COUNT(empgrocID) AS total_items
        FROM tb_empgrocery
        GROUP BY order_no
    ) b
    ON a.order_no = b.order_no
    SET a.total_items = COALESCE(b.total_items, 0), 
    a.total_amount = COALESCE(b.total_amount, 0)
    WHERE a.order_no = OLD.order_no;
  END;
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