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395 lines
12 KiB
PHP
395 lines
12 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace traits\model;
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trait Adv
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{
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protected $optimLock = 'lock_version';
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//protected $serializeField = [];
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//protected $readonlyField = [];
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//protected $partition = [];
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/**
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* 利用__call方法重载 实现一些特殊的Model方法 （魔术方法）
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* @access public
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* @param string $method 方法名称
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* @param mixed $args 调用参数
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* @return mixed
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*/
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public function __call($method, $args)
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{
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if (strtolower(substr($method, 0, 3)) == 'top') {
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// 获取前N条记录
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$count = substr($method, 3);
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array_unshift($args, $count);
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return call_user_func_array([ & $this, 'topN'], $args);
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} else {
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return parent::__call($method, $args);
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}
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}
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/**
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* 对保存到数据库的数据进行处理
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* @access protected
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* @param mixed $data 要操作的数据
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* @return boolean
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*/
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protected function _before_write($data)
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{
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// 检查序列化字段
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$data = $this->serializeField($data);
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}
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// 查询成功后的回调方法
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protected function _after_find(&$result, $options = [])
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{
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// 检查序列化字段
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$this->checkSerializeField($result);
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// 缓存乐观锁
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$this->cacheLockVersion($result);
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}
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// 查询数据集成功后的回调方法
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protected function _after_select(&$resultSet, $options = [])
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{
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// 检查序列化字段
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$resultSet = $this->checkListSerializeField($resultSet);
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}
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// 写入前的回调方法
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protected function _before_insert(&$data, $options = [])
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{
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// 记录乐观锁
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$data = $this->recordLockVersion($data);
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}
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// 更新前的回调方法
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protected function _before_update(&$data, $options = [])
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{
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// 检查乐观锁
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$pk = $this->getPK();
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if (isset($options['where'][$pk])) {
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$id = $options['where'][$pk];
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if (!$this->checkLockVersion($id, $data)) {
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return false;
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}
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}
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// 检查只读字段
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$data = $this->checkReadonlyField($data);
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}
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/**
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* 记录乐观锁
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* @access protected
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* @param array $data 数据对象
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* @return array
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*/
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protected function recordLockVersion($data)
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{
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// 记录乐观锁
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if ($this->optimLock && !isset($data[$this->optimLock])) {
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if (in_array($this->optimLock, $this->fields, true)) {
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$data[$this->optimLock] = 0;
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}
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}
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return $data;
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}
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/**
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* 缓存乐观锁
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* @access protected
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* @param array $data 数据对象
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* @return void
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*/
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protected function cacheLockVersion($data)
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{
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if ($this->optimLock) {
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if (isset($data[$this->optimLock]) && isset($data[$this->getPk()])) {
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// 只有当存在乐观锁字段和主键有值的时候才记录乐观锁
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$_SESSION[$this->name . '_' . $data[$this->getPk()] . '_lock_version'] = $data[$this->optimLock];
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}
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}
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}
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/**
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* 检查乐观锁
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* @access protected
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* @param inteter $id 当前主键
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* @param array $data 当前数据
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* @return mixed
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*/
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protected function checkLockVersion($id, &$data)
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{
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// 检查乐观锁
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$identify = $this->name . '_' . $id . '_lock_version';
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if ($this->optimLock && isset($_SESSION[$identify])) {
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$lock_version = $_SESSION[$identify];
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$vo = $this->field($this->optimLock)->find($id);
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$_SESSION[$identify] = $lock_version;
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$curr_version = $vo[$this->optimLock];
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if (isset($curr_version)) {
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if ($curr_version > 0 && $lock_version != $curr_version) {
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// 记录已经更新
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$this->error = 'record has update';
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return false;
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} else {
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// 更新乐观锁
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$save_version = $data[$this->optimLock];
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if ($save_version != $lock_version + 1) {
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$data[$this->optimLock] = $lock_version + 1;
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}
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$_SESSION[$identify] = $lock_version + 1;
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}
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}
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}
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return true;
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}
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/**
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* 查找前N个记录
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* @access public
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* @param integer $count 记录个数
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* @param array $options 查询表达式
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* @return array
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*/
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public function topN($count, $options = [])
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{
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$options['limit'] = $count;
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return $this->select($options);
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}
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/**
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* 查询符合条件的第N条记录
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* 0 表示第一条记录 -1 表示最后一条记录
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* @access public
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* @param integer $position 记录位置
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* @param array $options 查询表达式
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* @return mixed
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*/
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public function getN($position = 0, $options = [])
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{
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if ($position >= 0) {
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// 正向查找
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$options['limit'] = $position . ',1';
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$list = $this->select($options);
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return $list ? $list[0] : false;
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} else {
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// 逆序查找
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$list = $this->select($options);
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return $list ? $list[count($list) - abs($position)] : false;
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}
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}
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/**
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* 获取满足条件的第一条记录
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* @access public
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* @param array $options 查询表达式
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* @return mixed
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*/
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public function first($options = [])
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{
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return $this->getN(0, $options);
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}
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/**
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* 获取满足条件的最后一条记录
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* @access public
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* @param array $options 查询表达式
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* @return mixed
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*/
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public function last($options = [])
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{
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return $this->getN(-1, $options);
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}
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/**
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* 返回数据
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* @access public
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* @param array $data 数据
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* @param string $type 返回类型 默认为数组
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* @return mixed
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*/
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public function returnResult($data, $type = 'array')
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{
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switch ($type) {
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case 'array':
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return $data;
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case 'object':
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return (object) $data;
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default: // 允许用户自定义返回类型
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if (class_exists($type)) {
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return new $type($data);
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} else {
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throw new \think\Exception(' class not exist :' . $type);
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}
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}
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}
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/**
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* 返回数据列表
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* @access protected
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* @param array $resultSet 数据
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* @param string $type 返回类型 默认为数组
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* @return void
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*/
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protected function returnResultSet(&$resultSet, $type = '')
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{
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foreach ($resultSet as $key => $data) {
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$resultSet[$key] = $this->returnResult($data, $type);
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}
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return $resultSet;
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}
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/**
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* 检查序列化数据字段
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* @access protected
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* @param array $data 数据
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* @return array
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*/
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protected function serializeField(&$data)
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{
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// 检查序列化字段
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if (!empty($this->serializeField)) {
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// 定义方式 $this->serializeField = ['ser'=>['name','email']];
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foreach ($this->serializeField as $key => $val) {
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if (empty($data[$key])) {
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$serialize = [];
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foreach ($val as $name) {
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if (isset($data[$name])) {
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$serialize[$name] = $data[$name];
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unset($data[$name]);
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}
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}
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if (!empty($serialize)) {
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$data[$key] = serialize($serialize);
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}
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}
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}
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}
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return $data;
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}
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// 检查返回数据的序列化字段
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protected function checkSerializeField(&$result)
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{
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// 检查序列化字段
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if (!empty($this->serializeField)) {
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foreach ($this->serializeField as $key => $val) {
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if (isset($result[$key])) {
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$serialize = unserialize($result[$key]);
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foreach ($serialize as $name => $value) {
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$result[$name] = $value;
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}
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unset($serialize, $result[$key]);
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}
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}
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}
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return $result;
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}
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// 检查数据集的序列化字段
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protected function checkListSerializeField(&$resultSet)
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{
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// 检查序列化字段
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if (!empty($this->serializeField)) {
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foreach ($this->serializeField as $key => $val) {
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foreach ($resultSet as $k => $result) {
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if (isset($result[$key])) {
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$serialize = unserialize($result[$key]);
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foreach ($serialize as $name => $value) {
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$result[$name] = $value;
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}
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unset($serialize, $result[$key]);
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$resultSet[$k] = $result;
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}
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}
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}
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}
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return $resultSet;
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}
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/**
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* 检查只读字段
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* @access protected
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* @param array $data 数据
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* @return array
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*/
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protected function checkReadonlyField(&$data)
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{
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if (!empty($this->readonlyField)) {
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foreach ($this->readonlyField as $key => $field) {
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if (isset($data[$field])) {
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unset($data[$field]);
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}
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}
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}
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return $data;
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}
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/**
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* 得到分表的的数据表名
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* @access public
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* @param array $data 操作的数据
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* @return string
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*/
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public function getPartitionTableName($data = [])
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{
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// 对数据表进行分区
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if (isset($data[$this->partition['field']])) {
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$field = $data[$this->partition['field']];
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switch ($this->partition['type']) {
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case 'id':
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// 按照id范围分表
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$step = $this->partition['expr'];
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$seq = floor($field / $step) + 1;
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break;
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case 'year':
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// 按照年份分表
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if (!is_numeric($field)) {
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$field = strtotime($field);
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}
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$seq = date('Y', $field) - $this->partition['expr'] + 1;
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break;
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case 'mod':
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// 按照id的模数分表
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$seq = ($field % $this->partition['num']) + 1;
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break;
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case 'md5':
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// 按照md5的序列分表
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$seq = (ord(substr(md5($field), 0, 1)) % $this->partition['num']) + 1;
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break;
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default:
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if (function_exists($this->partition['type'])) {
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// 支持指定函数哈希
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$fun = $this->partition['type'];
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$seq = (ord(substr($fun($field), 0, 1)) % $this->partition['num']) + 1;
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} else {
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// 按照字段的首字母的值分表
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$seq = (ord($field{0}) % $this->partition['num']) + 1;
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}
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}
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return $this->getTableName() . '_' . $seq;
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} else {
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// 当设置的分表字段不在查询条件或者数据中
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// 进行联合查询，必须设定 partition['num']
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$tableName = [];
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for ($i = 0; $i < $this->partition['num']; $i++) {
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$tableName[] = 'SELECT * FROM ' . $this->getTableName() . '_' . ($i + 1);
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}
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return '( ' . implode(" UNION ", $tableName) . ') AS ' . $this->name;
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}
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}
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}
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