我正在为PHP PDO编写一个class,以便缩短准备和执行方法。
而不是每次都要写一个准备和绑定:
$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被重复,所以我创建了一个类来去掉这个:
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;
}
}
因此,这变得更容易,并成为:
$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。但这样我只能为每个QuickPDO对象做一个准备,这不是很方便,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;
}
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,但我搞不清是什么。
好的,已解决
$myPDO->set([':animal_type' => 'Like', ':animal_name' => 'This']);
$prep = $db->prepare($myPDO->insert('animals'));
$prep->execute($myPDO->args);
$myPDO->set([':animal_type' => 'Works', ':animal_name' => 'Fine']);
$prep->execute($myPDO->args);
顺序很重要。。。