在NodeJS中我们可以借助ORM框架来方便地实现事务操作,这里用bookshelf.js来举例说明。...bookshelf.js是一个基于knex.js的Node.js ORM框架,支持PostgreSQL,MySQL和SQLite3 简单来说,bookself是一个优秀的代码库,它易于阅读、理解、可扩展...bookshelf遵从和backbone.js一样棒的Models和Collections思想,使用相同的模式、命名惯例和哲学构建轻量、易于操控的ORM。...**/ Bookshelf.plugin('registry'); return Bookshelf; }; model/users.js 'use strict' const bookshelf...var Users = bookshelf.Model.extend({ tableName: 'users' }); module.exports = Users; model/room.js
在NodeJS中我们可以借助ORM框架来方便地实现事务操作,这里用bookshelf.js来举例说明。...bookshelf.js是一个基于knex.js的Node.js ORM框架,支持PostgreSQL,MySQL和SQLite3 简单来说,bookself是一个优秀的代码库,它易于阅读、理解、可扩展...bookshelf遵从和backbone.js一样棒的Models和Collections思想,使用相同的模式、命名惯例和哲学构建轻量、易于操控的ORM。...return Bookshelf; }; model/users.js 'use strict' const bookshelf = require('....var Users = bookshelf.Model.extend({ tableName: 'users' }); module.exports = Users; model/room.js
After this has happend hundreds of times, L finally made a great effort to decide to tidy up his bookshelf...To make his bookshelf look more smart, L decided to arrange his books such that their height on the bookshelf...(i.e.the shortest book is on the left,and as one moves towards the right end of the bookshelf the books....”, where X is the maximum number of books L can put onto his bookshelf....At most 6 book(s) can be put onto the bookshelf. 我解法是在求给定的序列中最长下降子序列中,还要回朔求倒着的最长下降子序列,再把正着的和倒着的加上一起。
(book1); bookShelf.add(book2); bookShelf.add(book3); bookShelf.remove(book3); //基于underscore这个js...title> ...*/ //基于underscore这个js库,还可以使用each的方法获取collection中的数据 bookShelf.each(function(book){
效果预览 生成Token 进入网站 登录微信读书 (islu.cn) 扫码登录 F12打开控制台复制Token 静态生成网页 在适当位置创建read.js 文件 我以根目录举例 粘贴一下代码内容 记得看注释...} }) }) .catch(error => console.log('Wechat Reading error', error)); 运行 node read.js...获取数据生成的 JSON 文件 在页面中加入以下代码
title:'default' }, initialize:function(){ //初始化操作 } }); //定义一个Collection对象 var BookShelf...=new BookShelf; //将model添加到Collection中,这是集合管理Model的必要操作,可以使用不同的方式 //方式1:手动添加 bookshelf.add(book1); bookshelf.add...(book2); bookshelf.add(book3) //也可以移除 bookshelf.remove(book2); //方式2:数组添加,在实例化Bookshelf的时候添加 var bookshelf...=new BookShelf([book1,book2,book3]); //方式3:使用each()遍历 bookShelf.each(function(book)){ alert(book.get...我们可以在集合上绑定 “change” 事件,从而当集合中的模型发生变化时fetch(获得)通知,集合也可以监听 “add” 和 “remove” 事件, 从服务器更新,并能使用 Underscore.js
方法从服务器端获取数据 使用前提:要从server获取数据,首先要定义url属性;当然,我们也可以在fetch中定义url的值; 注意:在Collection中,无urlRoot这个属性; 示例: var bookShelf...=new Backbone.Collection; bookShelf.url='/books/'; bookShelf.fetch({ //获取成功时,返回success信息 success:function...=new Backbone.Collection; bookshelf.bind('reset',showAllBooks);//在fetch之前绑定reset方法 bookshelf.fetch({...; } }); //reset方法 showAllBooks:function(){ bookshelf.each(function book){ document.writeIn(book.get...除此之外,Backbone 还代理了 Underscore.js 用来给Backbone.Collection 提供 6 个对象函数。
代码清单4 BookShelf类(BookShelf.java) package com.yrt; public class BookShelf implements Aggregate {...bookShelf; private int index; public BookShelfIterator(BookShelf bookShelf) { this.bookShelf...构造函数会将收到的Bookshelf的实例保存在bookShelf成员中,并将index初始化为0. hasNext方法是Iterator接口中所声明的方法。...bookShelf = new BookShelf(4); bookShelf.appendBook(new Book("Around the World in 80 Days"));...bookShelf.appendBook(new Book("Bible")); bookShelf.appendBook(new Book("Cinderella")
_name if __name__ == "__main__": bookShelf = BookShelf() bookShelf.appendBook(Book("A"))...bookShelf.appendBook(Book("B")) bookShelf.appendBook(Book("C")) bookShelf.appendBook(Book("D"..._bookShelf: BookShelf = bookShelf self...._name if __name__ == "__main__": bookShelf: BookShelf = BookShelf() bookShelf.appendBook(Book...("A")) bookShelf.appendBook(Book("B")) bookShelf.appendBook(Book("C")) bookShelf.appendBook
> { @Override public int select(int dbs, BookShelf t) { return Math.abs(..., new BookShelf.GridStrategy()); } } 单表单主键增删改查 public class DemoSimplePk { private...var bss = new ArrayList(); for (int i = 0; i < 100; i++) { var...bs = new BookShelf("user" + i, "book" + i, "comment" + i, new Date()); bss.add(bs);...>(); for (int i = 0; i < BookShelf.PARTITIONS; i++) { bss.addAll(db.find(
bookShelf; private int index; public BookShelfIterator(BookShelf bookShelf) {...this.bookShelf = bookShelf; index = 0; } @Override public boolean hasNext() {... bookShelf = new BookShelf(4); bookShelf.appendBook(new Book("深入理解Java虚拟机"));...bookShelf.appendBook(new Book("深入分析Java Web技术内幕")); bookShelf.appendBook(new Book("Java编程思想")...); bookShelf.appendBook(new Book("Linux就该这么学")); Iterator iterator = bookShelf.iterator
比如基于 Knex 的bookshelf: var knex = require('knex')({ // 可替换为Knex支持的其它数据库 client: 'mysql', connection...: process.env.MYSQL_DATABASE_CONNECTION }); var bookshelf = require('bookshelf')(knex); var User = bookshelf.Model.extend...({ tableName: 'users', posts: function() { return this.hasMany(Posts); } }); var Posts = bookshelf.Model.extend...This is true if you switch from one platform to another, such as JS/Node.js to C#/.NET....参考资料 Why you should avoid ORMs (with examples in Node.js) Stop using Knex.js – Using SQL query builder
Aggregate { private Book[] books; private int last = 0; public BookShelf(int maxsize) {...bookShelf; private int index; public BookShelfIterator(BookShelf bookShelf) { this.bookShelf...= bookShelf; this.index = 0; } public boolean hasNext() { if (index < bookShelf.getLength...bookShelf = new BookShelf(4); bookShelf.appendBook(new Book("A")); bookShelf.appendBook...(new Book("B")); bookShelf.appendBook(new Book("C")); bookShelf.appendBook(new Book("
bookShelf; private int index; public BookShelfIterator(BookShelf bookShelf) { this.bookShelf...= bookShelf; } @Override public boolean hasNext() { if(index<bookShelf.getLength()){...bookShelf = new BookShelf(4); bookShelf.appendBook(new Book("A")); bookShelf.appendBook(new...bookShelf = new BookShelf(); bookShelf.appendBook(new Book("A")); bookShelf.appendBook(new Book...("B")); bookShelf.appendBook(new Book("C")); bookShelf.appendBook(new Book("D")); Iterator
bookShelf; private int index; public BookShelfIterator(BookShelf bookShelf){ this.bookShelf...bookShelf = new BookShelf(5); //向书架中添加书籍 bookShelf.appendBook(new Book("深入理解Java虚拟机"...)); bookShelf.appendBook(new Book("Java编程思想")); bookShelf.appendBook(new Book("高性能MySQL...")); bookShelf.appendBook(new Book("Effective Java 中文版")); bookShelf.appendBook(new Book...上面例子中书架类BookShelf 代表的就是这个角色。
(100), INTIME DATE ); 表名为:bookshelf,有列:图书id,图书名称,图书类型,作者,入库时间。...通过上面学习的 SELECT语法,来查询一下这张表: SELECT * FROM bookshelf; 可以发现,新建的bookshelf表没有任何记录。...INSERT INTO bookshelf (book_id, book_name, book_type, author, intime) VALUES (1, '飘', '长篇小说', '玛格丽特·...改 的基本语法: UPDATE 表名 SET 列名 = 新的值; 删 的基本语法: DELETE FROM 表名; 现在来模拟一下场景: 1、修改作者名: UPDATE bookshelf...DELETE FROM bookshelf WHERE book_name = '从你的全世界路过'; COMMIT; 通过上面的几个栗子????
(100), INTIME DATE ); 表名为:bookshelf,有列:图书id,图书名称,图书类型,作者,入库时间。...通过上面学习的 SELECT语法,来查询一下这张表: SELECT * FROM bookshelf; 可以发现,新建的bookshelf表没有任何记录。...INSERT INTO bookshelf (book_id, book_name, book_type, author, intime) VALUES (1, '飘', '长篇小说', '玛格丽特·...改 的基本语法: UPDATE 表名 SET 列名 = 新的值; 删 的基本语法: DELETE FROM 表名; 现在来模拟一下场景: 1、修改作者名: UPDATE bookshelf SET...DELETE FROM bookshelf WHERE book_name = '从你的全世界路过'; COMMIT; 通过上面的几个栗子????
导入包 from django.views.decorators.csrf import csrf_exempt # 使用装饰器即可避免csrf限制 @csrf_exempt def add_bookshelf...在前后端不分离的项目中,若需要在AJAX使用csrftoken的值则可在js脚本中通过document.cookie直接获取cookie的值(也可以通过其他更快捷的轮子如js-cookie)。...在前后端分离的项目中(已配置django-cors-headers),无法直接使用js从cookie中获取csrfToken的值(浏览器的同源策略),即使已经成功设置了csrfToken的cookie值
True:主键 unique: True:值唯一 6、关系:ForeignKey,OneToOneField,ManyToManyField BookshelfInfo BookInfo bookshelf...= models.ForeignKey(Bookshelf) 用一访问多: 对象.模型类_set bookshelf.bookinfo_set 用一访问一: 对象.模型类...book.bookshelfinfo 访问id: 对象.属性_id book.bookshelf_id 使用例子: bookshelf = Bookshelf.objects.get...(pk=1) # 查询指定书架 bookshelf.bookinfo_set.all() # 获取该书架所有的书信息 7、使用:max_length db_column on_delete...=models.CASCADE class Meta:db_table,ording class Bookshelf(models.Model): shelf_type = models.CharField
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