• $M_shopping = M('Shops'); 

• $M_product = M('Product'); 

• $list_shops = $M_shopping->join('as shops left join hr_product as product on shops.product_id = product.p_id') 

• ->field('product.p_id,product.p_name,shops.product_amount,shops.product_id') 

• ->where("shops.user_cookie='".$_COOKIE['hr_think_userid']."'") 

• ->group('shops.id') 

• ->select();

三个数据表的关联查询

$M_shopping = M('Shops');

$M_product = M('Product');

$M_proimg = M('Product_image');

$list_shops = $M_shopping->join('as shops left join hr_product as product on shops.product_id = product.p_id left join

hr_product_image as productimgon productimg.p_id = product.p_id')->fiel('productimg.pi_url,product.p_id,product.p_name,shops.product_amount,shops.product_id,product.am_id,

product.p_procolor,product.p_price,product_amount*p_price as totalone')->where("shops.user_cookie='".$_COOKIE['hr_think_userid']."'")

->group('shops.id')->select();

数据表的查询条件

1：下面的是直接吧查询的条件放到了where中，这样就方便了条件的书写

$m_test = M("Product");

$productmeaage = $m_test->where("p_id='$proid'")->select();

2：除了上面的方法还有一种是以数组的方式

$M_product = M('Product');

$map['pid'] = $proid;

$p_result = $M_product->where($map)->select();