# Code coverage report for thinkjs/lib/Lib/Driver/Session/DbSession.js

## Statements: 100% (39 / 39) Branches: 92.86% (13 / 14) Functions: 100% (13 / 13) Lines: 100% (39 / 39) Ignored: none

All files » thinkjs/lib/Lib/Driver/Session/ » DbSession.js

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     /**
     * DbSession
     * 需要在数据库中建立对应的数据表
     *
     *  DROP TABLE IF EXISTS `think_session`;
      CREATE TABLE `think_session` (
        `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
        `key` varchar(255) NOT NULL DEFAULT '',
        `data` text,
        `expire` bigint(11) NOT NULL,
        PRIMARY KEY (`id`),
        UNIQUE KEY `cookie` (`key`),
        KEY `expire` (`expire`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
     *
     *
     * @return {[type]} [description]
     */
    module.exports = Cache(function(){
      'use strict';
      /**
       * Session的Model
       * @type {[type]}
       */
      var model = null;
      return {
        /**
         * gc类型
         * @type {String}
         */
        gcType: 'DbSession',
        /**
         * [init description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        init: function(options){
          this.super_('init', options);
          this.key = this.options.cookie;
          this.data = {};
          this.isChanged = false;
          if (!model) {
            model = D('Session');
          }
          this.model = model;
        },
        /**
         * 初始化数据
         * @return {[type]} [description]
         */
        initData: function(){
          if (!this.promise) {
            var self = this;
            this.promise = model.where({key: this.key}).find().then(function(data){
              if (isEmpty(data)) {
                return model.add({
                  key: self.key,
                  expire: Date.now() + self.options.timeout * 1000
                });
              }
              if (Date.now() > data.expire) {
                return;
              }
              self.data = JSON.parse(data.data || '{}');
            });
          }
          return this.promise;
        },
        /**
         * 获取
         * @param  {[type]} name [description]
         * @return {[type]}      [description]
         */
        get: function(name){
          var self = this;
          return this.initData().then(function(){
            return self.data[name];
          });
        },
        /**
         * 设置
         * @param {[type]} name  [description]
         * @param {[type]} value [description]
         */
        set: function(name, value){
          var self = this;
          return this.initData().then(function(){
            self.isChanged = true;
            self.data[name] = value;
          });
        },
        /**
         * 删除
         * @param  {[type]} name [description]
         * @return {[type]}      [description]
         */
        rm: function(name){
          var self = this;
          return this.initData().then(function(){
            self.isChanged = true;
            if (name) {
              delete self.data[name];
            }else{
              self.data = {};
            }
          })
        },
        /**
         * 将数据保存到数据库中
         * @return {[type]} [description]
         */
        flush: function(){
          var self = this;
          var data = {
            expire: Date.now() + self.options.timeout * 1000
          };
          return this.initData().then(function(){
            //数据有修改时才更新data字段
            if (self.isChanged) {
              data.data = JSON.stringify(self.data);
            }
            return model.where({key: self.key}).update(data);
          });
        },
        /**
         * [gc description]
         * @param  {[type]} now [description]
         * @return {[type]}     [description]
         */
        gc: function(now){
          return model.where({
            expire: ['<', now]
          }).delete();
        }
      };
    });