Detailed explanation of PHP object-oriented identification object instance

This article mainly brings you a brief talk about PHP object-oriented identification objects. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Identification object mode

The main function of this mode is to create the wehre condition string in the sql statement. See the code and comments directly below:

namespace woo\mapper;


//字段对象
class Field {
  protected $name = null;     //字段名称
  protected $operator = null;     //操作符  
  protected $comps = array();     //存放条件的数组  
  protected $incomplete = false;   //检查条件数组是否有值
  
  function __construct ($name){
    $this->name= $name;
  }
  
  //添加where 条件
  function addTest($operator,$value){
    $this->comps[] = array('name'=>$this->name,'operator'=>$operator,'value'=>$value);
  }
  
  //获取存放条件的数组
  function getComps(){
    return $this->comps;
  }
  
  function isIncomplete(){
    return empty($this->comps);
  }
}


//标识对象
class IdentityObject {
  protected $currentfield = null;    //当前操作的字段对象
  protected $fields = array();    //字段集合
  private $and = null;
  private $enforce = array();      //限定的合法字段    
  
  function __construct($field = null, array $enforce = null){
    if(!is_null($enforce)){
      $this->enforce = $enforce;
    }
    if(!is_null($field)){
      $this->field($field);
    }
  }
  
  //获取限定的合法字段
  function getObjectFields(){
    return $this->enforce;
  }
  
  //主要功能为设置当前需要操作的对象
  function field($fieldname){
    if(!$this->isVoid()&& $this->currentfield->isIncomplete()){
      throw new \Exception("Incomplete field");
    }
    $this->enforceField($fieldname);
    if(isset($this->fields[$fieldname]){
      $this->currentfield = $this->fields[$fieldname];
    } else {
      $this->currentfield = new Field($fieldname);
      $this->fields[$fieldname] = $this->currentfield;
    }
    return $this;          //采用连贯语法
  }
  
  //字段集合是否为空
  function isVoid(){
    return empty($this->fields);
  }
  
  //检查字段是否合法
  function enforceField ($fieldname){
    if(!in_array($fieldname,$this->enforce) && !empty($this->enforce)){
      $forcelist = implode(',',$this->enforce);
      throw new \Exception("{$fieldname} not a legal field {$forcelist}");
    }
  }
  
  
  //向字段对象添加where条件
  function eq($value){
    return $this->operator("=",$value);
  }
  
  function lt($value){
    return $this->operator("<",$value);
  }
  
  function gt($value){
    return $this->operator(">",$value);
  }
  
  //向字段对象添加where条件
  private function operator($symbol,$value){
    if($this->isVoid){
      throw new \Exception("no object field defined");
    }
    $this->currentfield->addTest($symbol,$value);
    return $this;                   //采用连贯语法
  }
  
  //获取此类中所有字段对象集合的where条件数组
  function getComps(){
    $ret = array();
    foreach($this->fields as $key => $field){
      $ret = array_merge($ret,$field->getComps());
    }
    return $ret;
  }
}

//客户端代码
$idobj = new IdentityObject ();
$idobj->field("name")->eq("The Good Show")->field("start")->gt(time())->lt(time()+(24*60*60));
$test = $idobj->getComps();
var_dump($test);

//输出类似下面的内容

/*
array{
  array('name'=>'name','operator'=>'=','value'=>'The Good Show'),
  array('name'=>'start','operator'=>'>','value'=>'123456'),  //123456表示time()函数输出的时间戳
  array('name'=>'start','operator'=>'<&#39;,&#39;value&#39;=>'123456')
}

*/

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