如果我知道MySQL同一行中其他列的值，如何获取列的值？

Question

I have to retrieve the column data by using the other column data in the same row which I already knew.

Eg. Table

table Name: fixtures

fix_id | fix_against
1837 |  Aus Vs. Eng
2942 |  Ind Vs. SA

Here I already knew the 'fix_id'.. So, I need to retrieve the 'fix_against' value using the 'fix_id' in the same row.

Suppose, if fix_id = 1837 , I will retrieve Aus vS Eng (fix_against) value.

Here is what I tried.

global $wpdb; $known_value = 1837;
  $sql = $wpdb->prepare( "SELECT fix_against FROM fixtures WHERE fix_id = '$known_value'");
$result = $wpdb->get_results( $sql );echo $result;

This doesn't apparently work. Any suggestion will be highly appreciated.

Answer 1

Your query is right. Your problem is here :

$result = $wpdb->get_results( $sql );
echo $result;

By default, $wpdb->get_results returns an array of objects. In your case, something like $result[0]->fix_against would work. However, if you only need value of one cell, you're better off using $wpdb->get_var

$fix_against = $wpdb->get_var($sql);
echo $fix_against;

If you only need one row, you could use $wpdb->get_row

$result= $wpdb->get_row($sql);
echo $result->fix_against;

You can learn more about wpdb class here