循环浏览2个查询的结果

Question

I have 2 queries that show month to date totals. I need to loop through them so they end up in the same table. Is it possible to combine the WHILE or combine the queries to have the ORDERS alternate?

$MTDcurrent = $db->Execute("SELECT SUM(order_total) AS MTDC, month(date_purchased) AS Months FROM " . TABLE_ORDERS ." 
                        WHERE orders_status IN(1,2,3,100,101,103,105) AND date(date_purchased) BETWEEN DATE_FORMAT(current_date,'%Y-01-01') AND current_date GROUP BY Months ASC LIMIT 10 ");

$MTDprevious = $db->Execute("SELECT SUM(order_total) AS MTDP, month(date_purchased) AS Months FROM " . TABLE_ORDERS ." 
                        WHERE orders_status IN(1,2,3,100,101,103,105) AND date(date_purchased) BETWEEN DATE_FORMAT(date_sub(current_date, INTERVAL 1 year),'%Y-01-01') AND date_sub(current_date, INTERVAL 1 year)
                        GROUP BY Months ASC LIMIT 10 ");

Thanks in Advance

Answer 1

You can do this directly with while loop like this:

while( ($row = array_shift( $MTDcurrent)) || ($row = array_shift( $MTDprevious))){
    $row = 'your data';
}

However I don't consider this clean and obvious way. You may rather merge arrays with array_merge (if there's no large amount of data):

foreach( array_merge( $MTDcurrent, $MTDprevious) as $row){
   $row = 'your data';
}

And if your code is performance critical and will use large amount of data you should implement Iterator with next function like this:

public function next() {
  $this->row = mysql_fetch_assoc( $this->query);
  if( $this->row){
     return;
  }

  if( count( $this->queries)){
    $this->query = mysql_query( array_shift( $this->queries));
    $this->next();
  }
}

Warning: this is just an idea, not whole implementation you should rely on!

EDIT blah, I got question wrong, you're looking for mysql UNION statement .

Answer 2

This is a slightly different approach avoiding the multiple queries. I have not tried it as I do not have an RDBMS on the machine I am using right now but it should be close enough -

SELECT
    SUM(order_total) AS MTDP,
    month(date_purchased) AS Months,
    year(date_purchased) AS Years
FROM orders
WHERE orders_status IN(1,2,3,100,101,103,105)
AND DATE(date_purchased) > DATE_FORMAT(DATE_SUB(CURRENT_DATE, INTERVAL 1 year),'%Y-01-01')
GROUP BY Years, Months
ORDER BY Months ASC, Years ASC

In your response to your comment - you could modify the date part of the WHERE clause to be a combination of your two WHERE clauses

AND (
        (date(date_purchased) BETWEEN DATE_FORMAT(current_date,'%Y-01-01') AND current_date)
    OR
        (date(date_purchased) BETWEEN DATE_FORMAT(date_sub(current_date, INTERVAL 1 year),'%Y-01-01') AND date_sub(current_date, INTERVAL 1 year))
)