ThinkPHP处理海量数据分表机制详细代码及说明_PHP教程
- WBOY원래의
- 2016-07-13 17:42:51995검색
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;$ipartition[num];$i++)
$tableName[] = SELECT * FROM .$this->getTableName()._.$i;
$tableName = ( .implode(" UNION ",$tableName).) AS .$this->name;
return $tableName;
}
}