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HomeBackend DevelopmentPHP TutorialThinkPHP处置海量数据分表机制详细代码

ThinkPHP处理海量数据分表机制详细代码

应用ThinkPHP内置的分表算法处理百万级用户数据.  数据表:  house_member_0  house_member_1  house_member_2  house_member_3  模型中  class MemberModel extends AdvModel {  protected $partition = array('field'=>'username','type'=>'id','num'=>'4');  public function getDao($data=array()) {  $data = empty($data) ? $_POST : $data;  $table = $this->getPartitionTableName($data);  return $this->table($table);  }  }  方法中  class MemberAction extends BaseAction {  public function login() {  if($this->isPost()) {  $this->validToken();  $dao = D('Member')->getDao();  $res = $dao->where('username = '.$_POST['username'])->find();  // output 为自定义方法  // $isAjax - bool  $this->output(false);  }  $this->display();  }  }  /**  +----------------------  * 得到分表的的数据表名  +----------------------  * @access public  +----------------------  * @param array $data 操作的数据  +----------------------  * @return string  +----------------------  */  public function getPartitionTableName($data=array()) {  // 对数据表进行分区  if(isset($data[$this->partition['field']])) {  $field = $data[$this->partition['field']];  switch($this->partition['type']) {  case 'id':  // 按照id范围分表  $step = $this->partition['expr'];  $seq = floor($field / $step)+1;  break;  case 'year':  // 按照年份分表  if(!is_numeric($field)) {  $field = strtotime($field);  }  $seq = date('Y',$field)-$this->partition['expr']+1;  break;  case 'mod':  // 按照id的模数分表  $seq = ($field % $this->partition['num'])+1;  break;  case 'md5':  // 按照md5的序列分表  $seq = (ord(substr(md5($field),0,1)) % $this->partition['num'])+1;  break;  default :  if(function_exists($this->partition['type'])) {  // 支持指定函数哈希  $fun = $this->partition['type'];  $seq = (ord(substr($fun($field),0,1)) % $this->partition['num'])+1;  }else{  // 按照字段的首字母的值分表  $seq = (ord($field{0}) % $this->partition['num'])+1;  }  }  return $this->getTableName().'_'.$seq;  }else{  // 当设置的分表字段不在查询条件或者数据中  // 进行联合查询,必须设定 partition['num']  $tableName = array();  for($i=0;$i<$this->partition['num'];$i++)  $tableName[] = 'SELECT * FROM '.$this->getTableName().'_'.$i;  $tableName = '( '.implode(" UNION ",$tableName).') AS '.$this->name;  return $tableName;  }  }

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