Question

我有以下代码，它将从这9个变量中获取值并将它们插入到表中。但是，我不知道如何将NULL值插入到我的表中。如第10行所示，如果我尝试使用关键字NULL，则将其视为字符串。

        $WorkOrder = $_POST['WorkOrder'];
        $Originated = $_POST['Originated'];
        $CustID = $_POST['CustID'];
        $Customer = $_POST['Customer'];
        $Contact = $_POST['Contact'];
        $Completed = $_POST['Completed'];
        $AccountNum = $_POST['AccountNum'];
        $Description = $_POST['Description'];
        $Status = $_POST['Status'];
        $Status = "NULL"; //Testing with NULL

        $insertquery = "INSERT INTO ElectronicShop(WorkOrder, Originated, CustID, Customer, Contact, Completed, AccountNum, Description, Status) 
                       VALUES ('$WorkOrder','$Originated','$CustID','$Customer','$Contact','$Completed','$AccountNum','$Description','$Status')";
        $data = sqlsrv_query($connectString, $insertquery) or die(print_r(sqlsrv_errors(SQLSRV_ERR_ALL), true));

我将通过网页中的文本框获取这9个变量的值。因此，我无法在查询中手动输入NULL。

Answer 1

而不是：

$insertquery = "INSERT INTO ElectronicShop(WorkOrder, Originated, CustID, Customer,  Contact, Completed, AccountNum, Description, Status) VALUES ('$WorkOrder','$Originated','$CustID','$Customer','$Contact','$Completed','$AccountNum','$Description','$Status')";

使用：

$insertquery = "INSERT INTO ElectronicShop(WorkOrder, Originated, CustID, Customer, Contact, Completed, AccountNum, Description, Status) VALUES
('$WorkOrder','$Originated','$CustID','$Customer','$Contact','$Completed','$AccountNum','$Description', NULL)";

您不需要为它指定变量，只需写入＆＃34; NULL＆＃34;在您的查询中没有字符串标记符号（＆＃39;）。

格尔茨

Answer 2

不要使用qoutes＆＃34;＆＃34;：

$ Status =＆＃34; NULL＆＃34 ;;

使用：

$ Status = null;

Answer 3

如果Status列的默认值不是NULL，则不要在insert语句的列列表中使用此列。

如何通过PHP代码将Null值放在SQL服务器中

3 个答案: