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- <?php
- namespace KIF\Dao;
- use KIF\Exception\DaoException;
- use KIF\Verify;
- use KIF\Exception\ParamsException;
- use Exception;
- use KIF\Db\MySQLi;
- use KIF\Dao\SqlHelper;
- use KIF\Core\Config;
- use KIF\Cache\Memcached;
- use KIF\Math\Math;
- /**
- * 数据库操作的抽象类
- * @author gaoxiaogang@yoka.com
- *
- */
- abstract class AbstractDao {
- /**
- * 数据表名
- * 该抽象类针对表的操作(如:delete、create、findBy)都是基于该属性。由继承的子类填充该值。
- * 好处:1、如果继承的子类只针对一个表,把tableName设为静态表名即可。
- * 2、如果继承的子类针对一类表操作(如根据某个唯一标志把相同结构的数据hash到多张表中),则针对不同表操作时,动态设置该值
- * @var string
- */
- protected $tableName;
- /**
- * 表的主键名。默认为id
- * @var string
- */
- protected $primaryKey = 'id';
-
- /**
- *
- * 是否使用缓存
- * @var boolean
- */
- private $useCache = false;
-
- /**
- *
- * 缓存失效时间 ,默认1小时
- * @var int
- */
- private $cache_expiration = 3600;
-
- /**
- *
- * 存放这个数据表的缓存标志。
- * 目的:清空这个标志,能清空这张表的所有行记录缓存
- * @var string
- */
- private $tableCacheFlag;
-
- /**
- *
- * 用于缓存表记录的memcache缓存集群标志
- * 优先使用config里的 memcached->dao_cache;如不存在,则使用 memcached->default;如仍不存在,则不启用缓存.
- * @var string
- */
- private $memcacheClusterFlag;
- /**
- *
- * 插入行为
- * @var string
- */
- const PARAM_CREATE_ACTION_INSERT = 'INSERT INTO';
- /**
- *
- * 插入,但重复时忽略
- * @var string
- */
- const PARAM_CREATE_ACTION_INSERT_IGNORE = 'INSERT IGNORE';
- /**
- *
- * 插入,但重复时完全replace
- * @var string
- */
- const PARAM_CREATE_ACTION_REPLACE = 'REPLACE INTO';
- /**
- *
- * 插入,但重复时自动转为update
- * @var string
- */
- const PARAM_CREATE_ACTION_ONDUPLICATE = 'ON DUPLICATE KEY UPDATE';
- /**
- * 数据库实例,可被动态切换到主库或从库
- *
- * @var KIF\Db\MySQLi
- */
- protected $db;
-
- /**
- *
- * mysql集群标志
- * @var string
- */
- private $cluster_flag;
- /**
- *
- * @param string $cluster_flag mysql集群标志
- *
- */
- public function __construct($cluster_flag = 'default') {
- $appConfig = Config::getInstance()->current();
- $dbConfig = $appConfig['db'];
-
- if (!$dbConfig || !isset($dbConfig[$cluster_flag]) || !is_string($dbConfig[$cluster_flag])) {
- throw new ParamsException("load config error:{$dbConfig}");
- }
- $this->cluster_flag = $cluster_flag;
-
- if (isset($appConfig['memcached']['dao_cache'])) {
- $this->memcacheClusterFlag = 'dao_cache';
- } elseif (isset($appConfig['memcached']['default'])) {
- $this->memcacheClusterFlag = 'default';
- } else {# 没有缓存配置,不启用缓存
- $this->useCache(false);
- }
- $dsn = $dbConfig[$cluster_flag];
- $this->db = new MySQLi($dsn);
- }
- /**
- *
- * 获取设置的主键名
- * @return string
- */
- public function getPrimaryKey() {
- return $this->primaryKey;
- }
- /**
- * 设置表名
- * 动态设置表名是为了拆表
- * @param $tableName
- */
- public function setTableName($tableName) {
- $this->tableName = $tableName;
- }
-
- /**
- *
- * 控制是否使用缓存。使用缓存,会将数据表的行记录缓存起来,极大的提高效率和高可用;同时也会在记录删除、更新时,清空对应的缓存。
- * @param boolean $useCache
- */
- public function useCache($useCache = true) {
- $this->useCache = (bool) $useCache;
- }
- /**
- * 解析条件
- * @param array|string $condition
- * @throws Exception parameter errors
- * @return string
- */
- public function parseCondition($condition = null) {
- if(empty($condition)) return '';
-
- // 如果条件语句是字符串 直接拼接
- if(is_string($condition)){
- return "
- WHERE ". $condition ." ";
- }
- // 如果不是字符串 强制传递数组 如果不是数组抛异常
- if(!is_array($condition)){
- throw new Exception('parameter errors');
- }
- $condition = $this->quote($condition);
- $where = array();
- foreach($condition as $tmpK => $tmpV) {
- # 避免条件字段重复,支持二维数组。比如$conditon = array(
- # array(
- # 'publish_time' => SqlHelper::addCompareOperator(">=", $s_ts),
- # ),
- # array(
- # 'publish_time' => SqlHelper::addCompareOperator("<", $e_ts),
- # ),
- # );
- # 以前只能这样变相支持:$condition = array(
- # 'publish_time' => SqlHelper::addCompareOperator(">=", $s_ts),
- # '`publish_time`' => SqlHelper::addCompareOperator("<", $e_ts),
- # );
- if (Verify::naturalNumber($tmpK)) {
- list($key, $val) = each($tmpV);
- } else {
- $key = $tmpK;
- $val = $tmpV;
- }
-
- if (strpos($key, '`') === false // 没用使用 ` 字符,比如 `status`
- && strpos($key, '(') === false) // 也不含有括号(即不是函数),比如 last_insert_id(status)
- {
- $key = "`{$key}`";
- }
- if(is_scalar($val)) {
- $where[] = "{$key} " . SqlHelper::explodeCompareOperator($val);
- } elseif(is_array($val)) {
- $where[] = "{$key} IN (".join(',', $val).")";
- } else {
- throw new Exception('parameter errors');
- }
- }
- return "
- WHERE ".join(' && ', $where)."
- ";
- }
- /**
- * 根据条件查找主键id列表集
- * 做这个方法,是出于架构上的考虑。只取出主键id集,然后通过主键id集才去取数据(内存或数据库)
- * @param array|String $condition 条件
- * @param string | int $limit 指定分页
- * @param string $order 指定排序
- * @return array 如:array(123, 124)。无值时返回空数组
- */
- public function findIdsBy($condition = null, $limit = null, $order = null) {
- $result = $this->findBy($condition, $this->primaryKey, $limit, $this->primaryKey, $order);
- if (! $result) {
- return array();
- }
- return array_keys($result);
- }
- /**
- * 查找的底层方法。对查找只提供有限支持,太复杂的查询请手动sql
- * final 让该方法禁止被继承
- * 1、根据条件查找,多条件只支持 与(&&),不支持或之类的
- * 2、支持limit
- * 3、group by
- * @param array|string $condition
- * @param string $returnAssociateKey 如果指定该指,返回的值不再以0,1,2为key,而是以其对应的值为key
- * @param string | int $limit
- * @param string $selectCols 要获取的列。语法:id, uid ,默认为 *
- * @param string $order 指定排序
- * @return array
- */
- final public function findBy($condition = null, $returnAssociateKey = null, $limit = null, $selectCols = '*', $order = null) {
- $where = $this->parseCondition($condition);
- if (!isset($limit) || !preg_match('#^(?:\d+\s*,\s*)?\d+$#', $limit)) {
- $strLimit = ' ';
- } else {
- $strLimit = " LIMIT $limit ";
- }
- $strOrder = '';
- if(!empty($order)) {
- $strOrder = " ORDER BY {$order} ";
- }
- if(!isset($selectCols)) {
- $selectCols = '*';
- }
- $sql = "SELECT {$selectCols} FROM {$this->tableName}
- {$where}
- {$strOrder}
- {$strLimit}
- ;
- ";
- return $this->db->fetchAll($sql, $returnAssociateKey);
- }
- public function fetchOne($condition = null, $selectCols = '*', $order = null) {
- $result = self::findBy($condition, null, 1, $selectCols, $order);
- if (!$result) {
- return false;
- }
- return array_pop($result);
- }
- /**
- * 获取所有
- * @param string $order 排序方式。默认以主键倒序;有效的格式:"create_time desc"
- * @param string $limit 该参数用于支持分页,默认为不使用分页。格式 "offset, length"
- * @return array
- */
- public function getsAll($order = null, $limit = null) {
- $ids = self::getsAllIds($order, $limit);
- return $this->gets($ids);
- }
- /**
- * 获取所有id列表集
- * @param string $order 排序方式。默认以主键倒序;有效的格式:"create_time desc"
- * @param string $limit 该参数用于支持分页,默认为不使用分页。格式 "offset, length"
- * @return array
- */
- public function getsAllIds($order = null, $limit = null) {
- if (is_null($order)) {
- $order = "{$this->primaryKey} desc";
- }
- if (!is_string($order)) {
- throw new Exception('$order 必须是字符串或null');
- }
- $condition = null;
- $ids = self::findIdsBy($condition, $limit, $order);
- return $ids;
- }
- /**
- * 获取指定$id
- * @param int | string $id
- * @return false | array
- */
- public function get($id) {
- if (Verify::int($id)) {
- if ($id < 1) {
- return false;
- }
- } elseif (is_string($id)) {
- if (strlen($id) == 0) {
- return false;
- }
- } else {
- return false;
- }
- $result = self::gets(array($id));// 调用该类自身的gets方法,而不是继承者的gets方法!
- if (!$result) {
- return false;
- }
- return array_pop($result);
- }
- /**
- * 批量获取信息
- * @param array $ids id组成的数组
- * @return array 无结果时返回空数组
- */
- public function gets(array $ids) {
- $return = array();
- if (empty($ids)) {
- return $return;
- }
- $ids = array_unique($ids);
-
- # 从缓存取
- $cache_return = self::getsFromCache($ids);
- $non_cache_ids = array_diff($ids, array_keys($cache_return));
- if (!$non_cache_ids) {
- return $cache_return;
- }
-
- # 从DB取
- $db_return = self::getsFromDB($non_cache_ids);
- if ($db_return) {
- self::setToCache($db_return);
- }
- foreach ($ids as $id) {
- if (isset($cache_return[$id])) {
- $return[$id] = $cache_return[$id];
- continue;
- }
-
- if (isset($db_return[$id])) {
- $return[$id] = $db_return[$id];
- continue;
- }
- }
-
- return $return;
- }
-
- /**
- *
- * 从后端数据库取结果
- * @param array $ids
- * @return array 格式:array(
- * (int) id => (mixed) value,
- * ... ,
- * )
- *
- */
- private function getsFromDB(array $ids) {
- $return = array();
- $condition = array(
- $this->primaryKey => $ids,
- );
- $result = $this->findBy($condition, $this->primaryKey);
- if (!$result) {
- return $return;
- }
- foreach ($ids as $id) {
- $id = (string) $id;// php的数组下标是int整时,如果超出了操作系统平台的最大有符号正整数后,会取不到值。转成字符串型,解决这个bug
- if (array_key_exists($id, $result)) {
- $return[$id] = $result[$id];
- }
- }
- return $return;
- }
-
- /**
- *
- * 获取表缓存的标志。后续这个表里每行的缓存,都会关联上这个表缓存标志。
- * 所以只要清空这个标志,即可使整个表记录的缓存失效。
- * @Exception DaoException::CACHE_SET_TABLE_FLAG_ERROR
- * @Exception DaoException::CACHE_SERVICE_UNAVAILABLE
- * @return String
- */
- public function getTableCacheFlag() {
- if ($this->tableCacheFlag) {
- return $this->tableCacheFlag;
- }
-
- $dbconfig = Config::getInstance()->get('db');
- $cacheKey_elements = array(
- serialize($dbconfig[$this->cluster_flag]),
- $this->tableName,
- 'table_cache_flag',
- );
- $key = Math::md5_16(join($cacheKey_elements, '::'));
- $objMemcached = new Memcached($this->memcacheClusterFlag);
- $tmpGetResult = $objMemcached->get($key);
- if ($tmpGetResult) {
- $this->tableCacheFlag = $tmpGetResult;
- return $this->tableCacheFlag;
- }
-
- if (is_null($tmpGetResult)) {// 缓存不存在,建立
- $tmpVal = microtime(true);
- if ($objMemcached->set($key, $tmpVal, 0)) {// 永不过期
- $this->tableCacheFlag = $tmpVal;
- return $this->tableCacheFlag;
- }
-
- # TODO 设置缓存失败的处理
- throw new DaoException(DaoException::CACHE_SET_TABLE_FLAG_ERROR);
- }
-
- if (!$tmpGetResult) {
- # TODO memcache服务不可用的处理
- throw new DaoException(DaoException::CACHE_SERVICE_UNAVAILABLE);
- }
- }
-
- /**
- *
- * 获取指定ids集对应的缓存key集
- * @param array $ids array(13343, 9939);
- * @Exception DaoException::CACHE_SET_TABLE_FLAG_ERROR
- * @Exception DaoException::CACHE_SERVICE_UNAVAILABLE
- * @return array 格式:array(
- * (int) id => (string) cacheKey,
- * ... ,
- *
- * )
- */
- public function getsCacheKeys(array $ids) {
- $tableCacheFlag = $this->getTableCacheFlag();
- $cacheKeys = array();
- $dbconfig = Config::getInstance()->get('db');
- foreach ($ids as $id) {
- $cacheKey_elements = array(
- $tableCacheFlag,
- serialize($dbconfig[$this->cluster_flag]),
- $this->tableName,
- $id,
- 'row_cache',// 这是针对数据库记录行的缓存
- );
- $cacheKeys[$id] = Math::md5_16(join($cacheKey_elements, '::'));
- }
-
- return $cacheKeys;
- }
-
- /**
- *
- * 从缓存里取数据表对应的行记录
- * @param array $ids
- * @return array 只返回缓存里有的值,如果缓存里没有任何值,则返回空数组
- */
- private function getsFromCache(array $ids) {
- $return = array();
- if (!$this->useCache) {
- return $return;
- }
- try {
- $cacheKeys = self::getsCacheKeys($ids);
- } catch (DaoException $e) {
- return $return;
- }
-
- $objMemcached = new Memcached($this->memcacheClusterFlag);
- $cacheVals = $objMemcached->gets($cacheKeys);
-
- $cache_return = array_combine(array_keys($cacheKeys), $cacheVals);
- foreach ($cacheVals as $tmpK => $tmpV) {
- if (is_null($tmpV)) {
- continue;
- }
-
- $return[array_search($tmpK, $cacheKeys)] = $tmpV;
- }
-
- return $return;
- }
-
- /**
- *
- * 从缓存里将$id对应的行记录删除
- * @param int $id
- * @throws Exception
- * @return Boolean
- */
- private function deleteFromCache($id) {
- if (!$this->useCache) {
- return false;
- }
- $objMemcached = new Memcached($this->memcacheClusterFlag);
-
- if (Verify::unsignedInt($id)) {
- try {
- $cacheKeys = self::getsCacheKeys(array($id));
- } catch (DaoException $e) {
- return false;
- }
- return $objMemcached->delete(array_pop($cacheKeys));
- }
-
- if (is_array($id) && !empty($id)) {
- try {
- $cacheKeys = self::getsCacheKeys($id);
- } catch (DaoException $e) {
- return false;
- }
-
- if (count($cacheKeys) == 1) {
- return $objMemcached->delete(array_pop($cacheKeys));
- }
- return $objMemcached->deletes($cacheKeys);
- }
-
- return false;
- }
-
- /**
- *
- * 清除缓存的这张表的所有记录
- * @return Boolean
- */
- public function deleteAllCaches() {
- if (!$this->useCache) {
- return false;
- }
-
- try {
- $tableCacheFlag = $this->getTableCacheFlag();
- } catch (DaoException $e) {
- return false;
- }
-
- $objMemcached = new Memcached($this->memcacheClusterFlag);
- return $objMemcached->delete($tableCacheFlag);
- }
-
- /**
- *
- * 将gets出来的结果集,存到缓存
- * @param array $results
- * @return boolean
- */
- private function setToCache(array $results) {
- if (!$this->useCache) {
- return false;
- }
- if (!$results) {
- return false;
- }
- try {
- $cacheKeys = self::getsCacheKeys(array_keys($results));
- } catch (DaoException $e) {
- return false;
- }
- $objMemcached = new Memcached($this->memcacheClusterFlag);
- return $objMemcached->sets(array_combine($cacheKeys, $results), $this->cache_expiration);
- }
- /**
- * 创建一条记录
- * @param array $tableInfo 待插入的数据
- * @param boolean $isAutoIncrement 操作成功时,如果该值为true,返回最后插入的id;否则返回true
- * @return boolean | int
- */
- private function _create(array $tableInfo, $isAutoIncrement = true, $action = self::PARAM_CREATE_ACTION_INSERT) {
- if(empty($tableInfo)) return false;
- switch($action) {
- case self::PARAM_CREATE_ACTION_INSERT :
- case self::PARAM_CREATE_ACTION_INSERT_IGNORE :
- case self::PARAM_CREATE_ACTION_REPLACE :
- break;
- default:
- throw new Exception('error insert action');
- }
- $sql = "{$action} {$this->tableName}
- SET
- ";
- $sqlSets = '';
- $tableInfo = $this->quote($tableInfo);
- foreach($tableInfo as $key => $val) {
- if($sqlSets != '') $sqlSets .= ' ,';
- $sqlSets .= "
- `{$key}` = {$val}
- ";
- }
- $sql .= $sqlSets;
- if($this->db->query($sql)) {
- if($isAutoIncrement) {
- $id = $this->db->insertId();
-
- # 清空这条记录的缓存
- self::deleteFromCache($id);
-
- return $id > 0 ? $id : true;
- } else {
- return true;
- }
- }
- return false;
- }
- /**
- * 创建一条记录,如果重复,则替换
- * @param array $tableInfo 待插入的数据
- * @param boolean $isAutoIncrement 操作成功时,如果该值为true,返回最后插入的id;否则返回true
- * @return boolean | int
- */
- public function replace(array $tableInfo, $isAutoIncrement = true) {
- return $this->_create($tableInfo, $isAutoIncrement, self::PARAM_CREATE_ACTION_REPLACE);
- }
- /**
- * 创建一条记录
- * @param array $tableInfo 待插入的数据
- * @param boolean $isAutoIncrement 操作成功时,如果该值为true,返回最后插入的id;否则返回true
- * @return boolean | int
- */
- public function create(array $tableInfo, $isAutoIncrement = true) {
- return $this->_create($tableInfo, $isAutoIncrement, self::PARAM_CREATE_ACTION_INSERT);
- }
- /**
- * 创建一条记录,如果重复,则忽略
- * @param array $tableInfo 待插入的数据
- * @param boolean $isAutoIncrement 操作成功时,如果该值为true,返回最后插入的id;否则返回true
- * @return boolean | int PS:$isAutoIncrement = true时:1、如果插入了,返回自动id值;2、如果已存在,返回true。
- */
- public function insertIgnore(array $tableInfo, $isAutoIncrement = true) {
- return $this->_create($tableInfo, $isAutoIncrement, self::PARAM_CREATE_ACTION_INSERT_IGNORE);
- }
- /**
- *
- * 插入一条记录,如果重复,自动转为更新语句
- * @param array $tableInfo
- * @param array $onDuplicate 如果重复时,需要更新的信息。如果不指定,则使用$tableInfo的值,即认为要全部更新
- * @return int | Boolean
- * int:只要存在,无论之前记录是否存在,都会返回记录的id;
- * true:执行成功,但获取记录id时失败;
- * false:执行失败
- */
- public function insertDuplicate(array $tableInfo, array $onDuplicate = array()) {
- if (!$tableInfo) {
- return false;
- }
- $tmpArrKeys = array();
- foreach ($tableInfo as $tmpKey => $tmpV) {
- $tmpArrKeys[] = "`{$tmpKey}`";
- }
- $sql = "INSERT INTO {$this->tableName} (" . join(', ', $tmpArrKeys). ") VALUES ";
- $tmpArrValues = array();
- $new_tableInfo = $this->quote($tableInfo);
- foreach ($new_tableInfo as $tmpKey => $tmpV) {
- $tmpArrValues[] = $tmpV;
- }
- $sql .= " ( " . join(', ', $tmpArrValues) . " ) ";
- $sql .= "
- ON DUPLICATE KEY UPDATE
- ";
- $tmpArrDps = array();
- if (empty($onDuplicate)) {
- $onDuplicate = $tableInfo;
- }
- $new_onDuplicate = $this->quote($onDuplicate);
- foreach ($new_onDuplicate as $tmpKey => $tmpV) {
- $tmpArrDps[] = " `{$tmpKey}` = {$tmpV} ";
- }
- $sql .= join(', ', $tmpArrDps);
- if (!$this->db->query($sql)) {
- return false;
- }
- $id = $this->db->insertId();
-
- # 清空这条记录的缓存
- self::deleteFromCache($id);
-
- return $id > 0 ? $id : true;
- }
- /**
- * 根据条件更新指定数据
- * @param array $tableInfo 待更新的数据(与数据库字段对应的数据)
- * @param array $condition 条件(与数据库字段对应的数据)
- * @return boolean
- */
- public function update(array $tableInfo, array $condition) {
- if(empty($tableInfo)) return false;
- $sql = "UPDATE {$this->tableName}
- SET
- ";
- $sqlSets = '';
- foreach($tableInfo as $key => $val) {
- if($sqlSets != '') $sqlSets .= ' ,';
- $sqlSets .= "
- `{$key}` = {$this->quote($val)}
- ";
- }
- $sql .= $sqlSets;
- $where = $this->parseCondition($condition);
- $sql .= "
- {$where}
- ;
- ";
- $tmpQueryResult = $this->db->query($sql);
-
- if ($tmpQueryResult) {
- if (isset($condition[$this->primaryKey])) {
- # 清空这条记录的缓存,条件里有可能是一批ids
- self::deleteFromCache($condition[$this->primaryKey]);
- } else {
- $this->deleteAllCaches();
- }
- }
-
- return $tmpQueryResult;
- }
- /**
- * 根据条件删除数据
- * @param Array|String $condition 条件
- * @return boolean
- */
- public function delete($condition) {
- $where = $this->parseCondition($condition);
- $sql = "DELETE FROM {$this->tableName}
- {$where}
- ;
- ";
-
- $tmpQueryResult = $this->db->query($sql);
-
- if ($tmpQueryResult) {
- if (isset($condition[$this->primaryKey])) {
- # 清空这条记录的缓存,条件里有可能是一批ids
- self::deleteFromCache($condition[$this->primaryKey]);
- } else {
- $this->deleteAllCaches();
- }
- }
-
- return $tmpQueryResult;
- }
- /**
- * 转义数据
- * @param mixed $data
- */
- public function quote($data) {
- return SqlHelper::escape($data, true);
- }
- /**
- * 判断给定的值是否是有效的自增主键值
- * @param mixid $pk
- * @return boolean
- */
- static protected function isValidPK($pk) {
- return SqlHelper::isValidPK($pk);
- }
- /**
- * 判断给定数组的某个key的值,是否是有效的自增主键值
- * @param array $arr
- * @param mixid $key
- * @return boolean
- */
- static protected function isValidPKWithArray(array $arr, $key) {
- return SqlHelper::isValidPKWithArray($arr, $key);
- }
- /**
- * 获取指定条件的记录数
- * @return int
- */
- public function totals($condtion = null){
- $result = $this->findBy($condtion, null, null, "count(*)");
- if (!$result) {
- return 0;
- }
- return (int) array_pop(array_pop($result));
- }
- }
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