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应用ThinkPHP内置的分表算法处理百万级用户数据.

作者:  时间: 2011-05-28

  数据表:

  house_member_0

  house_member_1

  house_member_2

  house_member_3

  模型中//wedding jewelry wholesale

  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jewelry display

  $seq = ($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;

  }

  }