ThinkPHP处理海量数据分表机制详细代码及说明
发布时间：2011-02-18 18:50:06作者：知识屋
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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