Question

当我们尝试更新时，会显示所有输出（“成功步骤”）1,2,4,5。但是当我们尝试检查数据库时，只有第一个数据库能够进行更新。

$host = "172.16.1.16";
$user  = "root";
$password =  "root";
$dbname1 = "nocs";
$dbname2 = "nocs_backup";

这是第一个数据库

$db1 = new mysqli($host, $user, $password, $dbname1);
if($db1->connect_errno > 0){
    die('Unable to connect to database' . $db1->connect_error);
}
else
{
    $updateComponentSql = "UPDATE component 
                           SET `Component_name`='$name', `Brand`='$brand', 
                               `Model`='$model', `Type`='$type',
                               `Capacity`='$capacity',`Serial_no`='$serial', 
                               `Description`='Installed' 
                           WHERE `Component_id`='$d_id' 
                           AND `computer_id`='$c_id'";

    if (mysqli_query($db1, $updateComponentSql))
    {
        echo "<script type='text/javascript'>
                alert('Succesful step 1');
              </script>";   
    }

这是第二个

    $db2 = mysqli_connect($host, $user, $password, $dbname2);
    echo "<script type='text/javascript'>alert('Succesful step 2');</script>";

    if($db2->connect_errno > 0)
    {   
        die('Unable to connect to database' . $db2->connect_error);
        echo "<script type='text/javascript'>alert('Successful step 3');</script>";
    }
    else
    {
        echo "<script type='text/javascript'>alert('Succesful step 4');</script>";
            if (mysqli_query($db2, "UPDATE component 
                                    SET (`Component_name`='$name', 
                                         `Brand`='$brand', `Model`='$model', 
                                         `Type`='$type',`Capacity`='$capacity',
                                         `Serial_no`='$serial', 
                                         `Description`='Installed' 
                                     WHERE `Component_id`='$d_id' 
                                     AND `computer_id`='$c_id)" ))
            {
                echo "<script type='text/javascript'>
                        alert('Succesful step 5');
                      </script>";
            }   
        }

}

我们的智慧结束了。请帮助我们:(

Answer 1

第二个UPDATE查询中有无关的括号。

if (mysqli_query($db2, "UPDATE component 
                        SET `Component_name`='$name', `Brand`='$brand', `Model`='$model', 
                            `Type`='$type', `Capacity`='$capacity', `Serial_no`='$serial', 
                            `Description`='Installed' 
                        WHERE `Component_id`='$d_id' AND `computer_id`='$c_id" ))
{
    echo "<script type='text/javascript'>alert('Succesful step 5');</script>";
} else {
    echo "<script type='text/javascript'>alert(" . json_encode(mysqli_error($db2)) . ");</script>";
}

更新仅发生在第一个数据库中，而不发生在第二个数据库中

1 个答案: