# Code coverage report for thinkjs/lib/Lib/Core/Model.js

## Statements: 100% (450 / 450) Branches: 100% (260 / 260) Functions: 100% (110 / 110) Lines: 100% (450 / 450) Ignored: none

All files » thinkjs/lib/Lib/Core/ » Model.js

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     var util = require('util');
    var querystring = require('querystring');
    var Db = thinkRequire('Db');

    //数据库实例化对象
    var dbInstances = {};
    //数据表的字段信息
    var tableFieldsCache = {};

    /**
     * Model类
     * @type {[type]}
     */
    var Model = module.exports = Class(function(){
      'use strict';
      //解析page参数
      var parsePage = function(options){
        if ('page' in options) {
          var page = options.page + '';
          var num = 0;
          if (page.indexOf(',') > -1) {
            page = page.split(',');
            num = parseInt(page[1], 10);
            page = page[0];
          }
          num = num || C('db_nums_per_page');
          page = parseInt(page, 10) || 1;
          return {
            page: page,
            num: num
          };
        }
        return {
          page: 1,
          num: C('db_nums_per_page')
        };
      };
      /**
       * 字符串命名风格转换
       * @param  {[type]} name [description]
       * @param  {[type]} type [description]
       * @return {[type]}      [description]
       */
      var parseName = function(name){
        name = name.trim();
        //首字母如果是大写，不转义为_x
        name = name[0].toLowerCase() + name.substr(1);
        return name.replace(/[A-Z]/g, function(a){
          return '_' + a;
        });
      };

      return {
        // 当前数据库操作对象
        db: null,
        // 主键名称
        pk: 'id',
        // 数据库配置信息
        config: null,
        // 配置信息key
        configKey: '',
        // 模型名称
        name: '',
        // 数据表前缀
        tablePrefix: '',
        // 数据表名（不包含表前缀）
        tableName: '',
        // 实际数据表名（包含表前缀）
        trueTableName: '',
        // 数据表字段信息
        fields: {},
        // 数据信息
        _data: {},
        // 参数
        _options: {},
        /**
         * 初始化
         * @access public
         * @param string $name 模型名称
         * @param mixed config 数据库连接信息
         */
        init: function(name, config){
          // 获取模型名称
          if (name) {
            this.name = name;
          }
          if (isString(config)) {
            config = {db_prefix: config};
          }
          this.config = config || '';
          //数据表前缀
          if (this.config.db_prefix) {
            this.tablePrefix = this.config.db_prefix;
          }else if(!this.tablePrefix) {
            this.tablePrefix = C('db_prefix');
          }
        },
        /**
         * 初始化数据库连接
         * @return {[type]} [description]
         */
        initDb: function(){
          if (this.db) {
            return this.db;
          }
          var config = this.config;
          var configKey = md5(JSON.stringify(config));
          if (!dbInstances[configKey]) {
            dbInstances[configKey] = Db.getInstance(config);
          }
          this.db = dbInstances[configKey];
          this.configKey = configKey;
          return this.db;
        },
        /**
         * 获取模型名
         * @access public
         * @return string
         */
        getModelName: function(){
          if (this.name) {
            return this.name;
          }
          var filename = this.__filename || __filename;
          var last = filename.lastIndexOf('/');
          this.name = filename.substr(last + 1, filename.length - last - 9);
          return this.name;
        },
        /**
         * 获取表名
         * @return {[type]} [description]
         */
        getTableName: function(){
          if (!this.trueTableName) {
            var tableName = this.tablePrefix || '';
            tableName += this.tableName || parseName(this.getModelName());
            this.trueTableName = tableName.toLowerCase();
          }
          return this.trueTableName;
        },
        /**
         * 获取数据表信息
         * @access protected
         * @return Promise
         */
        getTableFields: function(table, all){
          this.initDb();
          if (table === true) {
            table = undefined;
            all = true;
          }
          if (!isEmpty(this.fields)) {
            return getPromise(all ? this.fields : this.fields._field);
          }
          var tableName = table || this.getTableName();
          var fields = tableFieldsCache[tableName];
          if (!isEmpty(fields)) {
            this.fields = fields;
            return getPromise(all ? fields : fields._field);
          }
          var self = this;
          //从数据表里查询字段信息
          return this.flushFields(tableName).then(function(fields){
            self.fields = fields;
            if (C('db_fields_cache')) {
              tableFieldsCache[tableName] = fields;
            }
            return getPromise(all ? fields : fields._field);
          });
        },
        /**
         * 获取数据表信息
         * @param  {[type]} table [description]
         * @return Promise       [description]
         */
        flushFields: function(table){
          table = table || this.getTableName();
          return this.initDb().getFields(table).then(function(data){
            var fields = {
              '_field': Object.keys(data),
              '_autoinc': false,
              '_unique': []
            };
            var types = {};
            for(var key in data){
              var val = data[key];
              types[key] = val.type;
              if (val.primary) {
                fields._pk = key;
                if (val.autoinc) {
                  fields._autoinc = true;
                }
              }else if (val.unique) {
                fields._unique.push(key);
              }
            }
            fields._type = types;
            return fields;
          })
        },
        /**
         * 根据数据获取类型为唯一的字段
         * @return {[type]} [description]
         */
        getUniqueField: function(data){
          if (!data) {
            return this.fields._unique[0];
          }
          var fields = this.fields._unique;
          for(var i = 0, length = fields.length; i < length; i++){
            if (data[fields[i]]) {
              return fields[i];
            }
          }
        },
        /**
         * 获取上一次操作的sql
         * @return {[type]} [description]
         */
        getLastSql: function(){
          return this.initDb().getLastSql();
        },
        /**
         * 获取主键名称
         * @access public
         * @return string
         */
        getPk: function(){
          //如果fields为空，那么异步去获取
          if (isEmpty(this.fields)) {
            var self = this;
            return this.getTableFields().then(function(){
              return self.fields._pk || self.pk;
            })
          }
          return this.fields._pk || this.pk;
        },
        /**
         * 缓存
         * @param  {[type]} key    [description]
         * @param  {[type]} expire [description]
         * @param  {[type]} type   [description]
         * @return {[type]}        [description]
         */
        cache: function(key, timeout){
          if (key === undefined) {
            return this;
          }
          var options = this._getCacheOptions(key, timeout);
          this._options.cache = options;
          return this;
        },
        /**
         * 获取缓存的选项
         * @param  {[type]} key     [description]
         * @param  {[type]} timeout [description]
         * @return {[type]}         [description]
         */
        _getCacheOptions: function(key, timeout, type){
          if (isObject(key)) {
            return key;
          }
          if (isNumber(key)) {
            timeout = key;
            key = '';
          }
          //如果key为true，那么使用sql的md5值
          if (key === true) {
            key = '';
          }
          var cacheType = type === undefined ? C('db_cache_type') : type;
          var options = {
            key: key,
            timeout: timeout || C('db_cache_timeout'),
            type: cacheType,
            gcType: 'dbCache'
          }
          if (cacheType === 'File') {
            options.cache_path = C('db_cache_path');
          }
          return options;
        },
        /**
         * 指定查询数量
         * @param  {[type]} offset [description]
         * @param  {[type]} length [description]
         * @return {[type]}        [description]
         */
        limit: function(offset, length){
          this._options.limit = length === undefined ? offset : offset + ',' + length;
          return this;
        },
        /**
         * 指定分页
         * @return {[type]} [description]
         */
        page: function(page, listRows){
          this._options.page = listRows === undefined ? page : page + ',' + listRows;
          return this;
        },
        /**
         * where条件
         * @return {[type]} [description]
         */
        where: function(where){
          if (!where) {
            return this;
          }
          if (isString(where)) {
            where = {_string: where};
          }
          this._options.where = extend(this._options.where || {}, where);
          return this;
        },
        /**
         * 要查询的字段
         * @param  {[type]} field   [description]
         * @param  {[type]} reverse [description]
         * @return {[type]}         [description]
         */
        field: function(field, reverse){
          if (isArray(field)) {
            field = field.join(',');
          }else if (!field) {
            field = '*';
          }
          this._options.field = field;
          this._options.fieldReverse = reverse;
          return this;
        },
        /**
         * 设置表名
         * @param  {[type]} table [description]
         * @return {[type]}       [description]
         */
        table: function(table, hasPrefix){
          if (!table) {
            return this;
          }
          this._options.table = hasPrefix ? table : this.tablePrefix + table;
          return this;
        },
        /**
         * 联合查询
         * @return {[type]} [description]
         */
        union: function(union, all){
          if (!union) {
            return this;
          }
          if (!this._options.union) {
            this._options.union = [];
          }
          this._options.union.push({
            union: union,
            all: all
          });
          return this;
        },
        /**
         * .join({
         *   'xxx': {
         *     join: 'left',
         *     as: 'c',
         *     on: ['id', 'cid']
         *   }
         * })
         * 联合查询
         * @param  {[type]} join [description]
         * @return {[type]}      [description]
         */
        join: function(join){
          if (!join) {
            return this;
          }
          if (!this._options.join) {
            this._options.join = [];
          }
          if (isArray(join)) {
            this._options.join = this._options.join.concat(join);
          }else{
            this._options.join.push(join);
          }
          return this;
        },
        /**
         * 生成查询SQL 可用于子查询
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        buildSql: function(options){
          var self = this;
          return this.parseOptions(options).then(function(options){
            return '( ' + self.db.buildSelectSql(options).trim() + ' )';
          });
        },
        /**
         * 解析参数
         * @param  {[type]} options [description]
         * @return promise         [description]
         */
        parseOptions: function(oriOpts, extraOptions){
          var options;
          if (isScalar(oriOpts)) {
            options = extend({}, this._options);
          }else{
            options = extend({}, this._options, oriOpts, extraOptions);
          }
          //查询过后清空sql表达式组装 避免影响下次查询
          this._options = {};
          //获取表名
          options.table = options.table || this.getTableName();
          //表前缀，Db里会使用
          options.tablePrefix = this.tablePrefix;
          options.model = this.getModelName();
          //数据表别名
          if (options.alias) {
            options.table += ' AS ' + options.alias;
          }
          var promise = this.getTableFields(options.table).then(function(fields){
            if (isScalar(oriOpts)) {
              options = extend(options, self.parseWhereOptions(oriOpts), extraOptions);
            }
            return fields;
          })
          var self = this;
          return promise.then(function(fields){
            // 字段类型验证
            if (isObject(options.where) && !isEmpty(fields)) {
              var keyReg = /[\.\|\&]/;
              // 对数组查询条件进行字段类型检查
              for(var key in options.where){
                var val = options.where[key];
                key = key.trim();
                if (fields.indexOf(key) > -1) {
                  if (isScalar(val)) {
                    options.where[key] = self.parseType(options.where, key)[key];
                  }
                }else if(key[0] !== '_' && !keyReg.test(key)){ //字段名不合法，报错
                  return getPromise(new Error('field `' + key + '` in where condition is not valid'), true);
                }
              }
            }
            //field反选
            if (options.field && options.fieldReverse) {
              //fieldReverse设置为false
              options.fieldReverse = false;
              var optionsField = options.field.split(',');
              options.field = fields.filter(function(item){
                if (optionsField.indexOf(item) > -1) {
                  return;
                }
                return item;
              }).join(',');
            }
            return self._optionsFilter(options, fields);
          });
        },
        /**
         * 选项过滤器
         * 具体的Model类里进行实现
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _optionsFilter: function(options){
          return options;
        },
        /**
         * 数据类型检测
         * @param  {[type]} data [description]
         * @param  {[type]} key  [description]
         * @return {[type]}      [description]
         */
        parseType: function(data, key){
          var fieldType = this.fields._type[key] || '';
          if (fieldType.indexOf('bigint') === -1 && fieldType.indexOf('int') > -1) {
            data[key] = parseInt(data[key], 10) || 0;
          }else if(fieldType.indexOf('double') > -1 || fieldType.indexOf('float') > -1){
            data[key] = parseFloat(data[key]) || 0.0;
          }else if(fieldType.indexOf('bool') > -1){
            data[key] = !! data[key];
          }
          return data;
        },
        /**
         * 对插入到数据库中的数据进行处理，要在parseOptions后执行
         * @param  {[type]} data [description]
         * @return {[type]}      [description]
         */
        parseData: function(data){
          //因为会对data进行修改，所以这里需要深度拷贝
          data = extend({}, data);
          var key;
          if (!isEmpty(this.fields)) {
            for(key in data){
              var val = data[key];
              if (this.fields._field.indexOf(key) === -1) {
                delete data[key];
              }else if(isScalar(val)){
                data = this.parseType(data, key);
              }
            }
          }
          //安全过滤
          if (isFunction(this._options.filter)) {
            for(key in data){
              var ret = this._options.filter.call(this, key, data[key]);
              if (ret === undefined) {
                delete data[key];
              }else{
                data[key] = ret;
              }
            }
            delete this._options.filter;
          }
          data = this._dataFilter(data);
          return data;
        },
        /**
         * 数据过滤器
         * 具体的Model类里进行实现
         * @param  {[type]} data [description]
         * @return {[type]}      [description]
         */
        _dataFilter: function(data){
          return data;
        },
        /**
         * 数据插入之前操作，可以返回一个promise
         * @param  {[type]} data    [description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _beforeAdd: function(data){
          return data;
        },
        /**
         * 数据插入之后操作，可以返回一个promise
         * @param  {[type]} data    [description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _afterAdd: function(data){
          return data;
        },
        /**
         * 添加一条数据
         * @param {[type]} data    [description]
         * @param {[type]} options [description]
         * @param int 返回插入的id
         */
        add: function(data, options, replace){
          if (options === true) {
            replace = true;
            options = {};
          }
          //copy data
          data = extend({}, this._data, data);
          this._data = {};
          if (isEmpty(data)) {
            return getPromise(new Error('_DATA_TYPE_INVALID_'), true);
          }
          var self = this;
          //解析后的选项
          var parsedOptions = {};
          //解析后的数据
          var parsedData = {};
          return this.parseOptions(options).then(function(options){
            parsedOptions = options;
            return self._beforeAdd(data, parsedOptions);
          }).then(function(data){
            parsedData = data;
            data = self.parseData(data);
            return self.db.insert(data, parsedOptions, replace);
          }).then(function(){
            parsedData[self.getPk()] = self.db.getLastInsertId();
            return self._afterAdd(parsedData, parsedOptions);
          }).then(function(){
            return parsedData[self.getPk()];
          });
        },
        /**
         * 如果当前条件的数据不存在，才添加
         * @param  {[type]} data      要插入的数据
         * @param  {[type]} where      where条件
         * @param  boolean returnType 返回值是否包含type
         * @return {[type]}            promise
         */
        thenAdd: function(data, where, returnType){
          if (where === true) {
            returnType = true;
            where = '';
          }
          var self = this;
          return this.where(where).find().then(function(findData){
            if (!isEmpty(findData)) {
              var idValue = findData[self.getPk()];
              return returnType ? {id: idValue, type: 'exist'} : idValue;
            }
            return self.add(data).then(function(insertId){
              return returnType ? {id: insertId, type: 'add'} : insertId;
            });
          });
        },
        /**
         * 插入多条数据
         * @param {[type]} data    [description]
         * @param {[type]} options [description]
         * @param {[type]} replace [description]
         */
        addAll: function(data, options, replace){
          if (!isArray(data) || !isObject(data[0])) {
            return getPromise(new Error('_DATA_TYPE_INVALID_'), true);
          }
          if (options === true) {
            replace = true;
            options = {};
          }
          var self = this;
          return this.parseOptions(options).then(function(options){
            return self.db.insertAll(data, options, replace);
          }).then(function(){
            return self.db.getLastInsertId();
          });
        },
        /**
         * 删除后续操作
         * @return {[type]} [description]
         */
        _afterDelete: function(data){
          return data;
        },
        /**
         * 删除数据
         * @return {[type]} [description]
         */
        delete: function(options){
          var self = this;
          var parsedOptions = {};
          var affectedRows = 0;
          return this.parseOptions(options).then(function(options){
            parsedOptions = options;
            return self.db.delete(options);
          }).then(function(rows){
            affectedRows = rows;
            return self._afterDelete(parsedOptions.where || {}, parsedOptions);
          }).then(function(){
            return affectedRows;
          })
        },
        /**
         * 更新前置操作
         * @param  {[type]} data    [description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _beforeUpdate: function(data){
          return data;
        },
        /**
         * 更新后置操作
         * @param  {[type]} data    [description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _afterUpdate: function(data){
          return data;
        },
        /**
         * 更新数据
         * @return {[type]} [description]
         */
        update: function(data, options){
          data = extend({}, this._data, data);
          this._data = {};
          if (isEmpty(data)) {
            return getPromise(new Error('_DATA_TYPE_INVALID_'), true);
          }
          var self = this;
          var parsedOptions = {};
          var parsedData = {};
          var affectedRows = 0;
          return this.parseOptions(options).then(function(options){
            parsedOptions = options;
            return self._beforeUpdate(data, options);
          }).then(function(data){
            var pk = self.getPk();
            parsedData = data;
            data = self.parseData(data);
            if (isEmpty(parsedOptions.where)) {
              // 如果存在主键数据 则自动作为更新条件
              if (!isEmpty(data[pk])) {
                parsedOptions.where = getObject(pk, data[pk]);
                delete data[pk];
              }else{
                return getPromise(new Error('_OPERATION_WRONG_'), true);
              }
            }else{
              parsedData[pk] = parsedOptions.where[pk];
            }
            return self.db.update(data, parsedOptions);
          }).then(function(rows){
            affectedRows = rows;
            return self._afterUpdate(parsedData, parsedOptions);
          }).then(function(){
            return affectedRows;
          });
        },
        /**
         * 更新多个数据，自动用主键作为查询条件
         * @param  {[type]} dataList [description]
         * @return {[type]}          [description]
         */
        updateAll: function(dataList){
          if (!isArray(dataList) || !isObject(dataList[0])) {
            return getPromise(new Error('_DATA_TYPE_INVALID_'), true);
          }
          var self = this;
          var promises = dataList.map(function(data){
            return self.update(data);
          });
          return Promise.all(promises);
        },
        /**
         * 更新某个字段的值
         * @param  {[type]} field [description]
         * @param  {[type]} value [description]
         * @return {[type]}       [description]
         */
        updateField: function(field, value){
          var data = {};
          if (isObject(field)) {
            data = field;
          }else{
            data[field] = value;
          }
          return this.update(data);
        },
        /**
         * 字段值增长
         * @return {[type]} [description]
         */
        updateInc: function(field, step){
          step = parseInt(step, 10) || 1;
          return this.updateField(field, ['exp', field + '+' + step]);
        },
        /**
         * 字段值减少
         * @return {[type]} [description]
         */
        updateDec: function(field, step){
          step = parseInt(step, 10) || 1;
          return this.updateField(field, ['exp', field + '-' + step]);
        },
        /**
         * 解析options中简洁的where条件
         * @return {[type]} [description]
         */
        parseWhereOptions: function(options){
          if (isNumber(options) || isString(options)) {
            var pk = this.getPk();
            options += '';
            var where = {};
            if (options.indexOf(',') > -1) {
              where[pk] = ['IN', options];
            }else{
              where[pk] = options;
            }
            options = {
              where: where
            };
          }
          return options || {};
        },
        /**
         * find查询后置操作
         * @return {[type]} [description]
         */
        _afterFind: function(result){
          return result;
        },
        /**
         * 查询一条数据
         * @return 返回一个promise
         */
        find: function(options){
          var self = this;
          var parsedOptions = {};
          return this.parseOptions(options, {limit: 1}).then(function(options){
            parsedOptions = options;
            return self.db.select(options);
          }).then(function(data){
            return self._afterFind(data[0] || {}, parsedOptions);
          });
        },
        /**
         * 查询后置操作
         * @param  {[type]} result  [description]
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        _afterSelect: function(result){
          return result;
        },
        /**
         * 查询数据
         * @return 返回一个promise
         */
        select: function(options){
          var self = this;
          var parsedOptions = {};
          return this.parseOptions(options).then(function(options){
            parsedOptions = options;
            return self.db.select(options);
          }).then(function(result){
            return self._afterSelect(result, parsedOptions);
          });
        },
        /**
         * 查询添加
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        selectAdd: function(options){
          var self = this;
          var promise = getPromise(options);
          if (options instanceof Model) {
            promise = options.parseOptions();
          }
          return Promise.all([this.parseOptions(), promise]).then(function(data){
            var fields = data[0].field || self.fields._field;
            return self.db.selectAdd(fields, data[0].table, data[1]);
          });
        },
        /**
         * 返回数据里含有count信息的查询
         * @param  options  查询选项
         * @param  pageFlag 当页面不合法时的处理方式，true为获取第一页，false为获取最后一页，undefined获取为空
         * @return promise
         */
        countSelect: function(options, pageFlag){
          if (isBoolean(options)) {
            pageFlag = options;
            options = {};
          }
          var self = this;
          //解析后的options
          var parsedOptions = {};
          var result = {};
          return this.parseOptions(options).then(function(options){
            delete options.table;
            parsedOptions = options;
            return self.options({
              where: options.where,
              cache: options.cache,
              join: options.join,
              alias: options.alias
            }).count((options.alias || self.getTableName()) + '.' + self.getPk());
          }).then(function(count){
            var pageOptions = parsePage(parsedOptions);
            var totalPage = Math.ceil(count / pageOptions.num);
            if (isBoolean(pageFlag)) {
              if (pageOptions.page > totalPage) {
                pageOptions.page = pageFlag === true ? 1 : totalPage;
              }
              parsedOptions.page = pageOptions.page + ',' + pageOptions.num;
            }
            result = extend({count: count, total: totalPage}, pageOptions);
            if (!parsedOptions.page) {
              parsedOptions.page = pageOptions.page;
            }
            return self.select(parsedOptions);
          }).then(function(data){
            result.data = data;
            return result;
          });
        },
        /**
         * 获取某个字段下的记录
         * @return {[type]} [description]
         */
        getField: function(field, one){
          var self = this;
          return this.parseOptions({'field': field}).then(function(options){
            if (isNumber(one)) {
              options.limit = one;
            }else if (one === true) {
              options.limit = 1;
            }
            return self.db.select(options);
          }).then(function(data){
            var multi = field.indexOf(',') > -1;
            if (multi) {
              var fields = field.split(/\s*,\s*/);
              var result = {};
              fields.forEach(function(item){
                result[item] = [];
              })
              data.every(function(item){
                fields.forEach(function(fItem){
                  if (one === true) {
                    result[fItem] = item[fItem];
                  }else{
                    result[fItem].push(item[fItem]);
                  }
                })
                return one !== true;
              })
              return result;
            }else{
              data = data.map(function(item){
                return Object.values(item)[0];
              })
              return one === true ? data[0] : data;
            }
          });
        },
        /**
         * 根据某个字段值获取一条数据
         * @param  {[type]} name  [description]
         * @param  {[type]} value [description]
         * @return {[type]}       [description]
         */
        getBy: function(name, value){
          var where = getObject(name, value);
          return this.where(where).find();
        },
        /**
         * SQL查询
         * @return {[type]} [description]
         */
        query: function(sql, parse){
          if (parse !== undefined && !isBoolean(parse) && !isArray(parse)) {
            parse = [].slice.call(arguments, 1);
          }
          var self = this;
          sql = this.parseSql(sql, parse);
          return this.initDb().select(sql, this._options.cache).then(function(data){
            self._options = {};
            return data;
          });
        },
        /**
         * 执行SQL语法，非查询类的SQL语句，返回值为影响的行数
         * @param  {[type]} sql   [description]
         * @param  {[type]} parse [description]
         * @return {[type]}       [description]
         */
        execute: function(sql, parse){
          if (parse !== undefined && !isBoolean(parse) && !isArray(parse)) {
            parse = [].slice.call(arguments, 1);
          }
          sql = this.parseSql(sql, parse);
          return this.initDb().execute(sql);
        },
        /**
         * 解析SQL语句
         * @return promise [description]
         */
        parseSql: function(sql, parse){
          if (parse === undefined) {
            parse = [];
          }else if(!isArray(parse)){
            parse = [parse];
          }
          parse.unshift(sql);
          sql = util.format.apply(null, parse);
          var map = {
            '__TABLE__': '`' + this.getTableName() + '`'
          };
          var self = this;
          sql = sql.replace(/__([A-Z]+)__/g, function(a, b){
            return map[a] || ('`' + self.tablePrefix + b.toLowerCase() + '`');
          });
          return sql;
        },
        /**
         * 启动事务
         * @return {[type]} [description]
         */
        startTrans: function(){
          var self = this;
          return this.initDb().commit().then(function(){
            return self.db.startTrans();
          });
        },
        /**
         * 提交事务
         * @return {[type]} [description]
         */
        commit: function(){
          return this.initDb().commit();
        },
        /**
         * 回滚事务
         * @return {[type]} [description]
         */
        rollback: function(){
          return this.initDb().rollback();
        },
        /**
         * 设置数据对象值
         * @return {[type]} [description]
         */
        data: function(data){
          if (data === true) {
            return this._data;
          }
          if (isString(data)) {
            data = querystring.parse(data);
          }
          this._data = data;
          return this;
        },
        /**
         * 设置操作选项
         * @param  {[type]} options [description]
         * @return {[type]}         [description]
         */
        options: function(options){
          if (options === true) {
            return this._options;
          }
          this._options = options;
          return this;
        },
        /**
         * 关闭数据库连接
         * @return {[type]} [description]
         */
        close: function(){
          delete dbInstances[this.configKey];
          if (this.db) {
            this.db.close();
            this.db = null;
          }
        }
      };
    }).extend(function(){
      'use strict';
      //追加的方法
      var methods = {};
      // 链操作方法列表
      var methodNameList = [
        'order','alias','having','group',
        'lock','auto','filter','validate'
      ];
      methodNameList.forEach(function(item){
        methods[item] = function(data){
          this._options[item] = data;
          return this;
        };
      });
      methods.distinct = function(data){
        this._options.distinct = data;
        //如果传过来一个字段，则映射到field上
        if (isString(data)) {
          this._options.field = data;
        }
        return this;
      };
      ['count','sum','min','max','avg'].forEach(function(item){
        methods[item] = function(field){
          field = field || this.pk;
          return this.getField(item.toUpperCase() + '(' + field + ') AS thinkjs_' + item, true);
        };
      });
      //方法别名
      var aliasMethodMap = {
        update: 'save',
        updateField: 'setField',
        updateInc: 'setInc',
        updateDec: 'setDec'
      };
      Object.keys(aliasMethodMap).forEach(function(key){
        var value = aliasMethodMap[key];
        methods[value] = function(){
          return this[key].apply(this, arguments);
        };
      });
      return methods;
    });
    /**
     * 关闭所有的数据库连接
     * @return {[type]} [description]
     */
    Model.close = function(){
      'use strict';
      for(var key in dbInstances) {
        dbInstances[key].close();
      }
      dbInstances = {};
    };
    /**
     * 清除数据表字段缓存
     * @return {[type]} [description]
     */
    Model.clearTableFieldsCache = function(){
      'use strict';
      tableFieldsCache = {};
    }