在自學的時候，感覺國內用的人真的是少，資料也很少，所以簡單記錄下關於CURD的用法！
一、初始化
數據庫中有一張user表，字段爲ID name
那麼如果要新添加一條記錄該怎麼做呢？
首先在models文件下建一個對應的類繼承於\Phalcon\Mvc\Model
裏面設定變量public $id; public $name; 對應於數據庫
public function getSource(){
return "user";
}
public function getId(){
return $this->id;
}
public function getName(){
return $this->name;
}
public function setName($name){
$this->name = $name;
}
這裏getSource裏的返回值爲數據庫中表的名字，如果類名與數據庫表名相同，則不用加這個方法
後面3個方法分別設定id可讀 name可讀 name可寫
二、讀取操作
一般這些對數據庫的操作都是放在模型類裏面的
比如現在要查找id爲1的數據
public function find(){
$data = $this->find("id = '1'");
return $data;
}
public function find(){
$data = $this->findFirst("id = '1'");
return $data;
}
find返回的是類的集合，findFirst返回的則是一條數據
那麼這麼讀取呢
先寫find的讀取方法
既然返回的是類的集合，那麼就用foreach遍歷
一般這些對數據庫的操作都是放在模型類裏面的
foreach ($data as $val) {
echo $val->name;
}
findFirst就相當於一個$val
直接讀取就可以了
echo $data->name;
find裏的參數：
| 參數 | 描述 | 舉例 |
|---|---|---|
| conditions | Search conditions for the find operation. Is used to extract only those records that fulfill a specified criterion. By default Phalcon\Mvc\Model assumes the first parameter are the conditions. | “conditions” => “name LIKE ‘steve%’” |
| columns | Return specific columns instead of the full columns in the model. When using this option an incomplete object is returned | “columns” => “id, name” |
| bind | Bind is used together with options, by replacing placeholders and escaping values thus increasing security | “bind” => array(“status” => “A”, “type” => “some-time”) |
| bindTypes | When binding parameters, you can use this parameter to define additional casting to the bound parameters increasing even more the security | “bindTypes” => array(Column::BIND_TYPE_STR, Column::BIND_TYPE_INT) |
| order | Is used to sort the resultset. Use one or more fields separated by commas. | “order” => “name DESC, status” |
| limit | Limit the results of the query to results to certain range | “limit” => 10 / “limit” => array(“number” => 10, “offset” => 5) |
| group | Allows to collect data across multiple records and group the results by one or more columns | “group” => “name, status” |
| for_update | With this option, Phalcon\Mvc\Model reads the latest available data, setting exclusive locks on each row it reads | “for_update” => true |
| shared_lock | With this option, Phalcon\Mvc\Model reads the latest available data, setting shared locks on each row it reads | “shared_lock” => true |
| cache | Cache the resultset, reducing the continuous access to the relational system | “cache” => array(“lifetime” => 3600, “key” => “my-find-key”) |
| hydration | Sets the hydration strategy to represent each returned record in the result | “hydration” => Resultset::HYDRATE_OBJECTS |
三、添加操作
比如現在要添加一個name爲sck的記錄
代碼爲：
public function add(){
$this->name = 'sck';
$this->save();
}
說明一下，在phalcon中，數據庫的具體操作都是封裝好的，而我們現在創建的這個類繼承於\Phalcon\Mvc\Model，這裏本身就已經有很多方法了，可以var
_dump出來看一下的，我們只要對一個空的$this 直接賦值 ，最後通過save這個方法就可以直接對數據庫進行操作了。
四、更新操作
這個和添加操作其實是很類似的
比如現在要對之前name爲sck的記錄進行更新
代碼爲：
public function update(){
$data = $this->find("name = 'sck'");
$data->name = 'scksck';
$data->save();
}
必須要將數據先讀取到$data中，$data是一個新的類，然後直接對裏面的數據進行修改，最後在save一下就可以了
五、刪除操作
比如現在要把id爲1的記錄刪除
代碼爲：
一般這些對數據庫的操作都是放在模型類裏面的
public function delete(){
$data = $this->find("id = '1'");
$data->delete();
}
也是要先將數據讀取到$data