从mysql降序排序

Question

So I was trying to write code in PHP. My goal was to write a generic code for mysql get operations. For an instance I would like to pass the table name and from and to values to get the result back in the form of JSON like below.

function get($table, $from, $to) {
     $q = mysqli_query('select * from '.$table.' limit '. $from.', '.$to);
     // do some more 
     return json_encode($arr);
}

The above code will give the result. as expected. Now the problem I face is when I want my code to return the values depending in the descending order depending on the auto_incrment ed column of my table. I'm completely stuck at this point.

I used to do like this when I didn't wanted a gereric code.

select * from tablename order by auto_inc_col limit 0,10

I tried with google to get some answers regarding the same. But couldn't get it. As per my experience I should specify the column name which I'm unable to with the code I'm trying to write now.

Now my question is this. Is it possible to specify a column name dynamically through any of the mysql queries. If possible How? Or should I quit this generic code and start writing the code for each table seperately? Please help me to get out of this problem.

Answer 1

I'm not quite sure what you are asking, but wouldn't something like this help ?

function get($table, $from, $to) {
    $q = mysqli_query('select * from '.$table.' order by auto_inc_col DESC limit '. $from.', '.$to);

You could even have variables $sortCol and $sortOrder.