1. ?? ??

1.1 ??? ??

??? ??? ? ??? ??? ??? ??? ???? ??? ?????. ? ?? hasOne? ?????. () ? alongTo() ??? ???? ??? ?????. ? ?? ??? ???? ??? ?????. ??? ??? ???(user ???)?? ?? ??? ??? ?? ???(userinfo ???)???. ??? ??? ??? ????.

user:
id
name

userinfo:
id
user_id
age

? ? ???? user_id ??? ?? ?????. . ?? ??? ????? ??? ??? ?? ??? ???? ???. ??? ??? ????.

??? ???? ??? ??? ??? ???? userinfo() ???? ?????.

//User模型

<?php

class User extends Model{
public function userinfo(){
return $this -> hasOne(&#39;UserInfo&#39;, &#39;user_id&#39;);
}
}

User ???? age() ???? ?????. ? ???? ??? userinfo ??? age ??? ????? ??? ?????.

//User模型
<?php

class User extends Model{
protected $readonly = [&#39;age&#39;];

public function userinfo(){
return $this -> hasOne(&#39;UserInfo&#39;, &#39;user_id&#39;);
}

public function getAgeAttr($value, $data){
if(isset($data[&#39;userinfo&#39;])){
return $data[&#39;userinfo&#39;][&#39;age&#39;];
}
return &#39;&#39;;
}
}

? ??? ??? ? find() ???? ???? ??? ???? ??? ??? ? ????.

//查詢user表中id為1的用戶

$user = User::get(1);
echo $user -> name;
echo $user -> age;

??: ? ????? $readonly ??? ???? $readonly ??? ??? ????. ThinkPHP ?? ??? ??????? ???? ??? ??? ? ?? ??? ?????. ? ????? age ??? ?? ?? ???? ???? $user -> age? ???? ? getAgeAttr ???? ???? ???? userinfo ??? age ??? ?????.

1.2 ??? ??

??? ??? ? ??? ??? ? ??? ?? ???? ?? ?? ????? ??? ???? ??? ?????. ?? ?? ??:

order:
id
user_id
order_no

order_goods:
id
order_id
name
price

?? ? ???? order_id ??? ?? ???? ????. ?? ??? ????? ???? ?? ??? ?? ?? ??? ??? ???. ???? ??? ??? ????.

??? ???? ??() ???? ?????. ? ???? ???? ?? ??? ??? ??? ?????.

//User模型

<?php
class User extends Model{
public function orders(){
return $this -> hasMany(&#39;Order&#39;, &#39;user_id&#39;);
}
}

?? ???? ??() ???? ?????. ? ???? ??? ?? ??? ??? ?????.

//Order模型
<?php
class Order extends Model{
public function goods(){
return $this -> hasMany(&#39;OrderGoods&#39;, &#39;order_id&#39;);
}
}

? ??? ??? ? find() ???? ???? ???? ??? ? ??? ???? ??? ??? ? ????.

//查詢user表中id為1的用戶的訂單信息和訂單的商品信息

$user = User::get(1, 'orders.goods');
var_dump($user -> orders[0] -> goods);

??? ????('orders.goods')? ?? ??? ???? ?? ?????. ??? ?? ? ?? ?? ?? ??.

2. ?? ??

2.1 ?? ?? ??

?? ?? ???? ?? ??? ???? ??? ?? ??? ??? ?? ??? ???? ?? ??? ??? ? ????. ?? ??, ?? ???? ?? ?? ??? ????? ???.

$user = User::get(1);
$orders = $user -> orders;
echo $user -> name;
foreach($orders as $order){
echo $order -> order_no . "\n";
}

2.2 ??? ??

??? ??? ? ???? ??? ???? ???? ??? ??? ???? ? ?? ??? ??? ? ????. . ?? ?? ??? ????.

$user = User::with('orders')->get(1);

? ???? $user ??? ??? ? with() ???? ??? ????? ??????. ?? ?? ?? ????? ??? ???? ???? ????. ?? ??? ???????.

2.3 ?? ??

?? ??? ?? ??? ?? ?? ??? ???? ?? with ??? ?? true ?? ??? ???? ?? ??? ???? ??? ?? ????. ?:

$user = User::with('orders')->find(1, true);

? ???? find() ???? true ????? ??????. ? ????? ??? ??? ?? ??? ????? ?? ?????.

? ??? ThinkPHP? ?? ?? ??? ???? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!