通过一个mysql查询更新多行

Question

i'm trying to update multiple rows by one mysql update query.this is my code.but it didn't work.it display error.i'm trying to update start and end field in mysql table

$resname=$_POST['resname'];
$rw1start=$_POST['rw1start'];
$rw1end=$_POST['rw1end'];
$rw2start=$_POST['rw2start'];
$rw2end=$_POST['rw2end'];
$rw3start=$_POST['rw3start'];
$rw3end=$_POST['rw3end'];
$rw4start=$_POST['rw4start'];
$rw4end=$_POST['rw4end'];
$rw5start=$_POST['rw5start'];
$rw5end=$_POST['rw5end'];
$rw6start=$_POST['rw6start'];
$rw6end=$_POST['rw6end'];
$rw7start=$_POST['rw7start'];
$rw7end=$_POST['rw7end'];

    $sql="UPDATE opening 
            SET start = (case when day = 'Monday' then '$rw1start'
                             when day = 'Tuesday' then '$rw2start'
                             when day = 'Wednesday' then '$rw3start'
                              when day = 'Thursday' then '$rw4start'
                               when day = 'Friday' then '$rw5start'
                                when day = 'Saturday' then '$rw6start'
                                 when day = 'Sunday' then '$rw7start'
                        end),
            SET end = (case when day = 'Monday' then '$rw1end'
                             when day = 'Tuesday' then '$rw2end'
                             when day = 'Wednesday' then '$rw3end'
                              when day = 'Thursday' then '$rw4end'
                               when day = 'Friday' then '$rw5end'
                                when day = 'Saturday' then '$rw6end'
                                 when day = 'Sunday' then '$rw7end'
                        end)        


                    WHERE (day in 'Monday', 'Tuesday', 'Wednesday','Thursday','Friday','Saturday','Sunday') AND res_name='$resname'";

    $result=mysql_query($sql)or die ("Error");

Answer 1

Your update command is not correct in addition you have column name end which is reserved. You need to backtick it. You have used set 2 times but in update statement you need only once as

update table set col1 = 'someval',col2='someval' 


$sql="UPDATE opening 
SET start = (
               case 
               when day = 'Monday' then '$rw1start'
               when day = 'Tuesday' then '$rw2start'
               when day = 'Wednesday' then '$rw3start'
               when day = 'Thursday' then '$rw4start'
               when day = 'Friday' then '$rw5start'
               when day = 'Saturday' then '$rw6start'
               when day = 'Sunday' then '$rw7start'
               end
             ),
     `end` = (
               case 
               when day = 'Monday' then '$rw1end'
               when day = 'Tuesday' then '$rw2end'
               when day = 'Wednesday' then '$rw3end'
               when day = 'Thursday' then '$rw4end'
               when day = 'Friday' then '$rw5end'
               when day = 'Saturday' then '$rw6end'
               when day = 'Sunday' then '$rw7end'
               end
             ) 
           WHERE day in ('Monday', 'Tuesday',  'Wednesday','Thursday','Friday','Saturday','Sunday') 
           AND res_name='$resname'";