PDO无法将数据插入数据库

Question

我是pdo的新手。在这里，我尝试使用以下编码将数据插入数据库。但是，我无法将数据插入数据库。我收到以下错误

  

致命错误：在非对象上调用成员函数prepare（）

我在SO和互联网上搜索了这个错误。有些人说在代码顶部添加global $conn;。我添加了这些代码，但我得到了相同的错误。如果我想清除此错误，有人告诉我该怎么办？

CONFIG.PHP

      <?php
            $user = "root";
            $password = "password";

            try
            {
                $conn = new PDO('mysql:host=localhost;dbname=evouchers', $user, $password);
                $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            }
            catch(PDOException $e)
            {
                'DATABASE CONNECTION ERROR' .$e->getMessage();
            }
        ?>

    **Database.php**

        <?php
            session_start();

            include('config.php');

                if(isset($_POST['submit_val']))
                {
                    $cmeal = $_POST['meal'];
                    try
                    {
                        $stmt = $conn->prepare("INSERT INTO ebmealplans ( MealPlanName, CreatedOn ) VALUES ( :cmeal, NOW() )");
                        $conn->errorInfo();
                        $stmt->bindParam(':cmeal', $cmeal, PDO::PARAM_STR);
                        $stmt->execute();
                    }
                    catch(PDOException $e)
                    {
                        'Query failed to insert into database ' .$e->getMessage();
                    }

                    $croom = $_POST['room'];
                    $ref_key = $conn->lastInsertId();
                    try
                    {
                        $stmt = $conn->prepare("INSERT INTO ebroomtypes ( RoomTypeName, CreatedOn ) VALUES ( :croom, NOW() )");
                        $conn->errorInfo();
                        $stmt->bindParam(':croom', $croom, PDO::PARAM_STR);
                        $stmt->execute();
                    }
                    catch(PDOException $e)
                    {
                        'Query failed to insert into database ' .$e->getMessage();
                    }


<*************** UPDATED CODES ***************>


  $creference = $_POST['reference'];
            $crefdate = $_POST['refdate'];
            $ccin = $_POST['cin'];
            $cout = $_POST['out'];
            $cgname = $_POST['gname'];
            $ctotaladults = $_POST['totaladults'];
            $cchildrens = $_POST['childrens'];
            $cinfants = $_POST['infants'];
            $cgphone = $_POST['gphone'];
            $cgemail = $_POST['gemail'];
            $cgfax = $_POST['gfax'];
            $cgaddress1 = $_POST['gaddress1'];
            $cgaddress2 = $_POST['gaddress2'];
            $cregion = $_POST['region'];
            $ccity = $_POST['city'];
            $cstate = $_POST['city_state'];
            $ccountry = $_POST['country'];
            $ccurrency = $_POST['currency'];
            $ccurrencyto = $_POST['tocurrency'];
            $camount = $_POST['camount'];
            $ccurrencyvalue = $_POST['currencyvalue'];
            $voucher_fk = $conn->lastInsertId();
            try
            {
                $stmt = $conn->prepare("INSERT INTO ebvouchers ( VoucherReference, BookingDate, CheckIndate, CheckOutDate, MealPlanID_Fk, RoomTypeID_Fk, GuestName, TotalAdults, Childrens, Infants, GuestPhone, GuestEmail, GuestFax, GuestAddressLine1, GuestAddressLine2, GuestRegion, GuestCity, GuestState, GuestCountry, GuestCurrency, GuestCurrencyTo, CurrencyAmount, GuestCurrencyValue, VoucherCreatedOn ) VALUES ( :reference, :refdate, :ccin, :cout, :r_key, :r_key, :gname, :totaladults, :childrens, :infants, :gphone, :gemail, :gfax, :gaddress1, :gaddress2, :gregion, :city, :state, :country, :currency, :currencyto, :amount, :currencyvalue, NOW() )");
                $conn->errorInfo();
                $stmt->bindParam(':reference', $creference, PDO::PARAM_STR);
                $stmt->bindParam(':refdate', $crefdate, PDO::PARAM_STR);
                $stmt->bindParam(':ccin', $ccin, PDO::PARAM_STR);
                $stmt->bindParam(':cout', $cout, PDO::PARAM_STR);
                $stmt->bindParam(':r_key', $ref_key, PDO::PARAM_STR);
                $stmt->bindParam(':r_key', $ref_key, PDO::PARAM_STR);
                $stmt->bindParam(':gname', $cgname, PDO::PARAM_STR);
                $stmt->bindParam(':totaladults', $ctotaladults, PDO::PARAM_STR);
                $stmt->bindParam(':childrens', $cchildrens, PDO::PARAM_STR);
                $stmt->bindParam(':infants', $cinfants, PDO::PARAM_STR);
                $stmt->bindParam(':gphone', $cgphone, PDO::PARAM_STR);
                $stmt->bindParam(':gemail', $cgemail, PDO::PARAM_STR);
                $stmt->bindParam(':gfax', $cgfax, PDO::PARAM_STR);
                $stmt->bindParam(':gaddress1', $cgaddress1, PDO::PARAM_STR);
                $stmt->bindParam(':gaddress2', $cgaddress2, PDO::PARAM_STR);
                $stmt->bindParam(':gregion', $cregion, PDO::PARAM_STR);
                $stmt->bindParam(':city', $ccity, PDO::PARAM_STR);
                $stmt->bindParam(':state', $cstate, PDO::PARAM_STR);
                $stmt->bindParam(':country', $ccountry, PDO::PARAM_STR);
                $stmt->bindParam(':currency', $ccurrency, PDO::PARAM_STR);
                $stmt->bindParam(':currencyto', $ccurrencyto, PDO::PARAM_STR);
                $stmt->bindParam(':amount', $camount, PDO::PARAM_STR);
                $stmt->bindParam(':currencyvalue', $ccurrencyvalue, PDO::PARAM_STR);
                $stmt->execute();
            }
            catch(PDOException $e)
            {
                'Query failed to insert into database ' .$e->getMessage();
            }

<*************** UPDATED CODES ***************>

                    foreach ( $_POST['slno'] as $key=>$slno )
                    {
                        $date = $_POST['date'][$key];
                        $particulars = $_POST['particulars'][$key];
                        $noofnights = $_POST['noofnights'][$key];
                        $rate = $_POST['rate'][$key];
                        $price = $_POST['price'][$key];
                        $tax = $_POST['tax'][$key];
                        $nettotal = $_POST['nettotal'];
                        $totalamount = $_POST['totalamount'];
                        $finaltotal = $_POST['finaltotal'];
                        $c_date = $date;
                        $c_slno = $slno;
                        $c_particulars = $particulars;
                        $c_noofnights = $noofnights;
                        $c_rate = $rate;
                        $c_price = $price;
                        $c_tax = $tax;
                        $c_nettotal = $nettotal;
                        $c_totalamount = $totalamount;
                        $c_finaltotal = $finaltotal;

                        try
                        {
                            $stmt = $conn->prepare("INSERT INTO ebvouchertariffs ( TariffSlNo, TariffDate, TariffParticulars, NoOfNights, TariffRate, TariffPrice, TariffTax, TariffNetTotal, TariffAddTotal, TariffFinalTotal, VoucherID_Fk, CreatedOn ) VALUES ( :c_slno, :c_date, :c_particulars, :c_noofnights, :c_rate, :c_price, :c_tax, :c_nettotal, :c_totalamount, :c_finaltotal, :voucher_fk, NOW() )");
                        $conn->errorInfo();
                        $stmt->bindParam(':c_slno', $c_slno, PDO::PARAM_STR);
                        $stmt->bindParam(':c_date', $c_date, PDO::PARAM_STR);
                        $stmt->bindParam(':c_particulars', $c_particulars, PDO::PARAM_STR);
                        $stmt->bindParam(':c_noofnights', $c_noofnights, PDO::PARAM_STR);
                        $stmt->bindParam(':c_rate', $c_rate, PDO::PARAM_STR);
                        $stmt->bindParam(':c_price', $c_price, PDO::PARAM_STR);
                        $stmt->bindParam(':c_tax', $c_tax, PDO::PARAM_STR);
                        $stmt->bindParam(':c_nettotal', $c_nettotal, PDO::PARAM_STR);
                        $stmt->bindParam(':c_totalamount', $c_totalamount, PDO::PARAM_STR);
                        $stmt->bindParam(':c_finaltotal', $c_finaltotal, PDO::PARAM_STR);
                        $stmt->bindParam(':voucher_fk', $voucher_fk, PDO::PARAM_STR);
                        $stmt->execute();
                        }
                        catch(PDOException $e)
                        {
                            'Query failed to insert into database ' .$e->getMessage();
                        }

                        $conn = null;

                        }
                }
            ?>

Answer 1

您没有打印例外。如果您有任何例外，您将无法获得它。我想你$conn= null;中的问题 $ conn = null;此行使您的连接对象无效，并且在执行此行之后，您具有无效的pdo对象。因此，您在循环中遇到此错误。它应该在执行此行之前执行所有其他查询。只需删除此行。并打印您的异常消息，如下所示：

试试这个：

<?php
    session_start();

    include('config.php');

        if(isset($_POST['submit_val']))
        {
            $cmeal = $_POST['meal'];
            try
            {
                $stmt = $conn->prepare("INSERT INTO ebmealplans ( MealPlanName, CreatedOn ) VALUES ( :cmeal, NOW() )");
                $conn->errorInfo();
                $stmt->bindParam(':cmeal', $cmeal, PDO::PARAM_STR);
                $stmt->execute();
            }
            catch(PDOException $e)
            {
                die('Query failed to insert into database ' .$e->getMessage());
            }

            $croom = $_POST['room'];
            $ref_key = $conn->lastInsertId();
            try
            {
                $stmt = $conn->prepare("INSERT INTO ebroomtypes ( RoomTypeName, CreatedOn ) VALUES ( :croom, NOW() )");
                $conn->errorInfo();
                $stmt->bindParam(':croom', $croom, PDO::PARAM_STR);
                $stmt->execute();
            }
            catch(PDOException $e)
            {
               die( 'Query failed to insert into database ' .$e->getMessage());
            }

            foreach ( $_POST['slno'] as $key=>$slno )
            {
                $date = $_POST['date'][$key];
                $particulars = $_POST['particulars'][$key];
                $noofnights = $_POST['noofnights'][$key];
                $rate = $_POST['rate'][$key];
                $price = $_POST['price'][$key];
                $tax = $_POST['tax'][$key];
                $nettotal = $_POST['nettotal'];
                $totalamount = $_POST['totalamount'];
                $finaltotal = $_POST['finaltotal'];
                $c_date = $date;
                $c_slno = $slno;
                $c_particulars = $particulars;
                $c_noofnights = $noofnights;
                $c_rate = $rate;
                $c_price = $price;
                $c_tax = $tax;
                $c_nettotal = $nettotal;
                $c_totalamount = $totalamount;
                $c_finaltotal = $finaltotal;

                try
                {
                    $stmt = $conn->prepare("INSERT INTO ebvouchertariffs ( TariffSlNo, TariffDate, TariffParticulars, NoOfNights, TariffRate, TariffPrice, TariffTax, TariffNetTotal, TariffAddTotal, TariffFinalTotal, VoucherID_Fk, CreatedOn ) VALUES ( :c_slno, :c_date, :c_particulars, :c_noofnights, :c_rate, :c_price, :c_tax, :c_nettotal, :c_totalamount, :c_finaltotal, :voucher_fk, NOW() )");
                $conn->errorInfo();
                $stmt->bindParam(':c_slno', $c_slno, PDO::PARAM_STR);
                $stmt->bindParam(':c_date', $c_date, PDO::PARAM_STR);
                $stmt->bindParam(':c_particulars', $c_particulars, PDO::PARAM_STR);
                $stmt->bindParam(':c_noofnights', $c_noofnights, PDO::PARAM_STR);
                $stmt->bindParam(':c_rate', $c_rate, PDO::PARAM_STR);
                $stmt->bindParam(':c_price', $c_price, PDO::PARAM_STR);
                $stmt->bindParam(':c_tax', $c_tax, PDO::PARAM_STR);
                $stmt->bindParam(':c_nettotal', $c_nettotal, PDO::PARAM_STR);
                $stmt->bindParam(':c_totalamount', $c_totalamount, PDO::PARAM_STR);
                $stmt->bindParam(':c_finaltotal', $c_finaltotal, PDO::PARAM_STR);
                $stmt->bindParam(':voucher_fk', $voucher_fk, PDO::PARAM_STR);
                $stmt->execute();
                }
                catch(PDOException $e)
                {
                    die('Query failed to insert into database ' .$e->getMessage());
                }

                //$conn = null;

                }
        }
    ?>