zencart里常用 SQL

1.如何替换某个字段的一些字符

如我把products表的products_image字段中包含2011的字符替换成Zencart2012
update `products` set `products_image`=replace(`products_image`,'2011','zencart2012');

2.修改表的字段的长度

如我把products表的products_image字段长度修改为varchar(300)
ALTER TABLE products MODIFY product_image varchar(256) ;

3.清空某个表的所有属性

如清空products表的所有数据信息
truncate TABLE products;

4.查询某个时间段订单,也可以自己扩展查询某个时间段的产品或者新闻
SELECT * FROM `orders` WHERE `date_purchased` BETWEEN '2010-05-22 00:00:00' AND '2012-02-01 00:00:00' order by orders_id desc

5.SQL组合查询，查询某个类别的商品

“select distinct p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
p.products_date_added, p.products_price, p.products_type, p.master_categories_id
from ” . TABLE_PRODUCTS . ” p, ” . TABLE_PRODUCTS_DESCRIPTION . ” pd,
where p.products_id = pd.products_id and p.products_id in(select products_id from ".TABLE_PRODUCTS_TO_CATEGORIES." where categories_id=你要显示的类别)
and pd.language_id = ‘” . (int)$_SESSION['languages_id'] . “‘
and p.products_status = 1 ” . $display_limit

建议使用下面这种

“select distinct p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
p.products_date_added, p.products_price, p.products_type, p.master_categories_id
from ” . TABLE_PRODUCTS . ” p, ” . TABLE_PRODUCTS_DESCRIPTION . ” pd,”. TABLE_PRODUCTS_TO_CATEGORIES . ” pc
where p.products_id = pd.products_id and pc.categories_id in(54,55,62,67,61)
and pd.language_id = ‘” . (int)$_SESSION['languages_id'] . “‘
and p.products_status = 1 ” . $display_limit

6.获取zencart所有分类下拉菜单的函数
zen_draw_pull_down_menu('selectoption', zen_get_category_tree(), array_pop($arr), 'id="list"');