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                # 表操作 **鎖表** ``` Db::lock('ticket_record,ticket,member'); //多個表用半角逗號分隔 Db::lock('user as u,member as m'); //鎖定具有設置表前綴的表,多用在多表關聯操作時 ``` **解鎖表** ``` Db::unlock(); ``` **清空表** ``` Db::truncate('user'); ``` **獲取表所有字段列表** ``` Db::getTableFieldLists('user'); //獲取user表的所有字段 ``` **測表字段是否存在** ``` Db::fieldExists('title','news'); 檢測 news 表是否存在 title 字段 ``` **檢測表是否存在** ``` Db::tableExists('comment'); ``` **獲所有表信息** 獲得當前數據庫的所有表信息 , 數據大小包括碎片、數據、索引 ``` Db::getAllTableInfo(); ``` **獲得數據庫大小** 獲得當前數據庫大小即所有表碎片、數據、索引之和 ``` Db::getDataBaseSize(); ``` **獲取表大小** 獲得 news 表大小,包含表碎片、數據、索引之和 ``` Db::getTableSize('news'); ``` **修復表** ``` Db::repair('user'); ``` **優化表** ``` Db::optimize('user'); ``` **執行多條SQL語句** ``` $sql = <<<EOF CREATE TABLE `hd_core_attachment` ( `id` int(11) NOT NULL AUTO_INCREMENT, `uid` int(11) NOT NULL COMMENT '會員id', `filename` varchar(300) NOT NULL COMMENT '文件名', `path` varchar(300) NOT NULL COMMENT '相對路徑', `type` varchar(10) NOT NULL DEFAULT '' COMMENT '類型', `createtime` int(10) NOT NULL COMMENT '上傳時間', `size` mediumint(9) NOT NULL COMMENT '文件大小', `user_type` tinyint(1) DEFAULT NULL COMMENT '1 管理員 0 會員', PRIMARY KEY (`id`), KEY `uid` (`uid`) ) ENGINE=MyISAM AUTO_INCREMENT=28 DEFAULT CHARSET=utf8 COMMENT='附件'; CREATE TABLE `hd_rule` ( `rid` int(10) unsigned NOT NULL AUTO_INCREMENT, `siteid` int(10) unsigned NOT NULL COMMENT '站點編號', `name` varchar(45) DEFAULT NULL COMMENT '規則名稱', `module` varchar(45) DEFAULT NULL COMMENT '模塊名稱', `rank` tinyint(3) unsigned DEFAULT NULL COMMENT '排序', `status` tinyint(1) unsigned DEFAULT NULL COMMENT '是否禁用', PRIMARY KEY (`rid`), KEY `fk_hd_rule_hd_site1_idx` (`siteid`) ) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COMMENT='回復規則'; EOF; Db::sql($sql); ```
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