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4
| 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 = {};
} |