Ticket #22115: ticket-22115-save-query-errors.2.patch

src/wp-includes/wp-db.php

@@ -1366 +1366 @@
                 }
 
                 // If there is an error then take note of it..
-                if ( $this->last_error = mysql_error( $this->dbh ) ) {
+                if ( $this->last_error ) {
                         // Clear insert_id on a subsequent failed insert.
                         if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) )
                                 $this->insert_id = 0;
@@ -1419 +1419 @@
                 $this->result = @mysql_query( $query, $this->dbh );
                 $this->num_queries++;
 
+                $this->last_error = mysql_error( $this->dbh );
+
                 if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
-                        $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
+                        $this->queries[] = array( $query, $this->timer_stop(),
+                                                  $this->get_caller(), $this->last_error );
                 }
         }