Php 而循环只运行一次

我正在尝试开发一个交易应用程序，我编写了这个PHP脚本，它应该执行买卖订单，计划每5分钟运行一次，并执行订单表中所有pendingstatus=1的订单。 问题是一次只执行一个订单。以下是脚本：

public function execute_order(){
    $which_sql = "SELECT * FROM orders WHERE status_id = 1 AND price = (SELECT max(price) FROM orders WHERE status_id = 1)";
    $which_result = $this->connection ->query($which_sql);
    if($which_result->num_rows>0){
        while($row=$which_result->fetch_assoc()){
            $which=$row["order_type_id"];
            $ord_id = $row["ord_id"];
            echo "order type id= ".$which."\r\n";
            $maxprice = $row["price"];
            $volume = $row["vol"];
            $ord_id= $row["ord_id"];
            $comp = $row["comp"];
            $sh_id = $row["sh_id"];
            echo "price =". $maxprice."\r\n";
            echo "volume= ".$volume."\r\n";
            echo "order id = ".$ord_id."\r\n";
            echo "comp = ".$comp."\r\n";
            echo "sh_id= ".$sh_id."\r\n";

            //start of the switch phrase
            switch ($which){
                //SELL ORDER
                case 1:
                    //the update query
                    $update_sql = "UPDATE orders SET status_id = 2 WHERE ord_id = $ord_id";
                    //update execution
                    if ($this -> connection->query($update_sql) === TRUE){
                        echo "1. SUCCESSFULL SELL UPDATE \r\n";
                    }
                    else{
                        echo "ERROR SELL UPDATE: " . $this -> connection->error."\r\n";
                    }
                    //THE INSERT QUERY
                    $insert_sql = "INSERT INTO trades(tr_vol,tr_price, tr_ord_id) VALUES ('$volume','$maxprice','$ord_id')";
                    //THE INSERT EXECUTION
                    if($this->connection->query($insert_sql)==TRUE){
                        echo "2.SUCCESSFULL SELL INSERTION \r\n";
                    }
                    else{
                        echo "ERROR SELL INSERTION: ".$this -> connection->error."\r\n";
                    }
                    //ADDITION QUERY
                    $add_sql = "UPDATE market_table SET volume = (volume+$volume) WHERE e_name LIKE '$comp'";
                    //ADDITION EXECUTION
                    if($this -> connection->query($add_sql)==TRUE){
                        echo "3. SUCCESSFULL SELL ADDITION \r\n";
                    }
                    else{
                        echo "ERROR SELL ADDITION: ".$this -> connection->error."\r\n";
                    }
                    //PAYMENT QUERY
                    $total= ($maxprice*$volume);
                    $pay_sql= "UPDATE sh_credit SET credit = (credit+$total) WHERE sh_id = $sh_id";
                    //PAYMENT EXECUTION
                    if($this ->connection ->query($pay_sql)==TRUE){
                        echo"4. SUCCESSFULL SELL PAYMENT \r\n";
                        echo"________________________________________________________________\r\n";
                    }
                    else{
                        echo "ERROR SELL PAYMENT: ".$this -> connection->error."\r\n";
                    }



                //BUY ORDER
                case 2:
                    //check if there are stocks available for the order to be executed
                    $check_sql= "SELECT volume FROM market_table WHERE lower(e_name) LIKE '$comp'";
                    echo "*********VOLUME CHECK POINT******* \r\n";
                    $check_result = $this -> connection->query($check_sql);
                    if($check_result->num_rows > 0){
                        if($check_row= $check_result->fetch_assoc()){
                            $check_vol=$check_row["volume"];
                            echo "remaining volume= ".$check_vol."\r\n";

                            //execute the order when stocks are available
                            if($check_vol>0){
                                $total= ($maxprice*$volume);
                                //check if shareholder has enough credit
                                $check_credit_sql="SELECT credit FROM sh_credit WHERE sh_id = $sh_id";
                                $check_credit_result = $this->connection->query($check_credit_sql);
                                if ($check_credit_row=$check_credit_result->fetch_assoc()){
                                    $check_credit=$check_credit_row["credit"];
                                }
                                //execute the order when credit is enough
                                if ($check_credit >0){
                                    //charging query
                                    $charge_sql= "UPDATE sh_credit SET credit = (credit-$total) WHERE sh_id = $sh_id";
                                    //charge execution
                                    if($this ->connection ->query($charge_sql)==TRUE){
                                        echo"4. SUCCESSFULL BUY CHARGING \r\n";
                                    }
                                    else{
                                        echo "ERROR BUY CHARGING: ".$this -> connection->error."\r\n";
                                    }
                                    //the update query: update order's status
                                    $update_sql = "UPDATE orders SET status_id = 2 WHERE ord_id = $ord_id";
                                    //update execution
                                    if ($this -> connection->query($update_sql) === TRUE) {
                                        echo "1. SUCCESSFULL BUY UPDATE \r\n";
                                    }
                                    else {
                                        echo "ERROR BUY UPDATE: " . $this -> connection->error."\r\n";
                                    }   
                                    //insert query: insert into trades table the executed order
                                    $insert_sql = "INSERT INTO trades(tr_vol,tr_price, tr_ord_id) VALUES ('$volume','$maxprice','$ord_id')";
                                    //insert execution
                                    if($this -> connection->query($insert_sql) == TRUE){
                                        echo "2. SUCCESSFULL BUY INSERTION\r\n";
                                    }
                                    else{
                                        echo "ERROR BUY INSERTION: ".$this -> connection->error."\r\n";
                                    }
                                    //substraction the volume query
                                    $sub_sql = "UPDATE market_table SET volume = (volume-$volume) WHERE e_name LIKE '$comp'";
                                    //sub execution
                                    if($this -> connection->query($sub_sql)==TRUE){
                                        echo "3. SUCCESSFULL BUY SUBSTRACTION \r\n";
                                        echo"________________________________________________________________ \r\n";
                                    }
                                    else{
                                        echo "ERROR BUY SUBSTRACTING: ".$this -> connection->error."\r\n";
                                    }
                                }
                                else {
                                    echo"shareholder doesn't have enough credit \r\n";
                                    //cancel query
                                    $cancel_sql="UPDATE orders SET status_id = 3 WHERE ord_id = $ord_id";
                                    //cancel execution
                                    if($this -> connection->query($cancel_sql)==TRUE){
                                        echo"1. ORDER CANCELED SUCCESSFULLY \r\n";
                                        echo "________________________________________________________________ \r\n";
                                    }
                                    else{
                                        echo"ERROR CANCELING ORDER WHEN CREDIT ISN'T ENOUGH \r\n";
                                    }
                                }
                            }
                            else {
                                echo "available stocks aren't enough \r\n";
                                //cancel query
                                $cancel_sql="UPDATE orders SET status_id = 3 WHERE ord_id = $ord_id";
                                //cancel execution
                                if($this -> connection->query($cancel_sql)==TRUE){
                                    echo"1. ORDER CANCELED BECAUSE STOCKS ARE ENOUGH \r\n";
                                    echo"________________________________________________________________ \r\n";
                                }
                                else{
                                    echo"ERROR CANCELING ORDER WHEN STOCKS AREN'T ENOUGH \r\n";
                                }   
                            }
                        }       
                    }
            }
        }
    }
    else {
        echo "0 results";
    }
}

---

我认为你应该补充：

break;

---

在开关状态的每个案例的末尾。

我认为您应该添加：

break;

---

在切换状态的每个案例末尾。

以及在sql server上执行SELECT*FROM orders（状态为1）和price=SELECT maxprice FROM orders（状态为1）时，您有多少个结果？状态为1您确定您的结果不仅有一行吗？请在phpmydmin上运行您的查询，并确认它有多行记录。是的，它只返回一条记录，要尝试修改它，你能建议我另一种执行命令的方法吗？？这是一个学校项目，在sql server上执行SELECT*FROM orders（状态为1）和price=SELECT maxprice（从状态为1的订单中选择maxprice）时，您有多少个结果？状态为1您确定您的结果不仅有一行吗？请在phpmydmin上运行您的查询，并确认它有多个记录。是的，它只返回一行一条记录，要修改它，你能给我建议另一种执行命令的方式吗？？这是一个学校项目，可能无法解决您当前的问题，但您确实需要休息，除非您想执行所有案例。这可能无法解决您当前的问题，但您确实需要休息，除非您想执行所有案例。