我正在为 PHP PDO 编写一个类,以便我可以缩短准备和执行方法。
不必每次都编写准备和绑定:
$db = new PDO('sqlite:db.sdb');
$prep = $db->prepare("INSERT INTO animals (animal_type, animal_name) VALUES (:animal_type, :animal_name)");
$data_to_set = array(':animal_type' => 'Cow', ':animal_name' => 'Carolina');
$prep->execute($data_to_set);
在这种情况下, animal_type 和 animal_name 会重复,所以我创建了一个类来消除它:
class QuickPDO{
public $fields, $values, $args;
public function __construct($args){
foreach ($args as $key => $value) {
$this->fields .= substr($key, 1).', ';
$this->values .= $key.", ";
}
$this->values= substr($this->values, 0, -2);
$this->fields = substr($this->fields, 0, -2);
$this->args = $args;
}
public function insert($table){
$returning_query = "INSERT INTO $table ($this->fields) VALUES ($this->values)";
return $returning_query;
}
}
所以这变得更容易并变成:
$myPDO = new QuickPDO([':animal_type' => 'Cow', ':animal_name' => 'Carolina']);
$prep = $db->prepare($myPDO->insert('animals'));
$prep->execute($myPDO->args);
到这里,没问题。但是这样我只能为每个QuickPDO Object做一个prepare,不是很方便,所以我想把__construct改成一个函数“set”:
public function set($args){
foreach ($args as $key => $value) {
$this->fields .= substr($key, 1).', ';
$this->values .= $key.", ";
}
$this->values= substr($this->values, 0, -2);
$this->fields = substr($this->fields, 0, -2);
$this->args = $args;
}
并这样称呼它:
$myPDO = new QuickPDO();
$myPDO->set([':animal_type' => 'Cow', ':animal_name' => 'Carolina']);
$prep = $db->prepare($myPDO->insert('animals'));
$prep->execute($myPDO->args);
当我尝试对 $myPDO 执行新的 set() 时,问题就出现了。我做错了什么,但我无法弄清楚它是什么。