schema

SpringMVC简单构造restful, 并返回json

房东的猫 提交于 2019-12-20 11:55:27
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 文章要要点: 快速搭建构造restful的StringMvc GET, POST , PUT , DELETE的各种调用 同一资源 多种表述 ( ContentNegotiatingViewResolver 解析器),既可以返回对象给JSP, 也可以返回JSON 快速搭建构造restful的StringMvc 首现搭建一个简单的restfulMvc框架, 并上配置文件, 后期会增加带JSON返回值的配置 JAR包 web.xml配置 <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 可以自定义servlet.xml配置文件的位置和名称,默认为WEB-INF目录下,名称为[<servlet-name>]-servlet.xml,如spring-servlet.xml--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/spring-servlet.xml</param

AOP 与 Spring中AOP使用(上)

人走茶凉 提交于 2019-12-20 11:49:05
AOP简介 在软件业,AOP为Aspect Oriented Programming的缩写,意为:面向切面编程, 通过预编译方式和运行期动态代理实现程序功能的统一维护的一种技术。 AOP是OOP的延续,是软件开发中的一个热点,也是Spring框架中的一个重要内容,是函数式编程的一种衍生范型。 利用AOP可以对业务逻辑的各个部分进行隔离,从而使得业务逻辑各部分之间的耦合度降低,提高程序的可重用性,同时提高了开发的效率。 开发存在的问题 JDK动态代理 JDK动态代理必须依赖接口(必须有接口) public interface GoodsDao { public void save(); public void update(); } 接口实现类: public class GoodsDaoImpl implements GoodsDao { @Override public void save() { System.out.println("保存操作"); } @Override public void update() { System.out.println("更新操作"); } } JDK动态代理类: public class GoodsJDKProxy { public GoodsDao createProxy(GoodsDao goodsDao){ // 增强功能

Spring系列之AOP

不羁的心 提交于 2019-12-20 11:36:00
一、概述   AOP(Aspect Oriented Programming),面向切面编程,通过预编译方式和运行期动态代理实现程序功能的统一维护的一种技术,是Spring框架中的一个重要内容。利用AOP可以对业务逻辑的各个部分进行隔离,从而使得业务逻辑各部分之间的耦合度降低,提高程序的可用性,提高开发效率。   主要功能体现在:日志记录,性能统计,安全控制,事务处理,异常处理等。   主要概念: 切面(Aspect):要实现的交叉功能,是应用系统模块化的一个切面或领域,常见的例子就是日志记录 连接点(JoinPoint):应用程序执行过程中插入切面的地点,可以是方法调用,异常抛出,切面代码在这些地方插入到你的应用流程中,添加新的行为 通知(Advice):通知切面的实际实现,它通知应用系统新的行为 切入点(Pointcut):定义了通知应该在应用在哪些连接点,通常通过指定类名和方法名或者匹配类名和方法名式样的正则表达式来指定切入点 目标对象(Target):被通知的对象,既可以是你编写的类也可以是你要添加定制行为的第三方类   AOP实现的关键在于AOP框架自动创建的AOP代理,AOP代理主要分为静态代理和动态代理两大类,其中静态代理是使用AOP框架提供的命令进行编译,从而在编译阶段就可以生成AOP代理类,也称为编译时增强,动态代理则在运行时借助于JDK动态代理

SpringBoot+idea搭建微服务简化流程

断了今生、忘了曾经 提交于 2019-12-20 11:31:09
作者: 程序猿的月光宝盒 1.新建普通maven工程 2.在父级pom中按需修改 3.删除父级 src 目录 4.创建公共模块common,里面只有service接口和实体类 5.构建微服务模块,provider 6.引用Zookeeper和Dubbo的依赖 在这个provider中修改pom文件坐标 <dependencies> <!--引入公共模块项目--> <dependency> <groupId>cn.kgc</groupId> <artifactId>common</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <!--这是微服dubbo的核心服务包--> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> <exclusions> <exclusion> <artifactId>spring</artifactId> <groupId>org.springframework</groupId> </exclusion> </exclusions> </dependency> <!--这是zookeeper的服务操作包

database schema for timesheet

社会主义新天地 提交于 2019-12-20 10:10:25
问题 Could someone help me with a rough database schema for a timesheet application where the i would be able to Store hours per day for a time period ( 2 weeks ) for different projects. Ex person A can put 3 hours for projectA and 4 hours for projectB on the same day Make it so that its is easy to get a reports on total hours put for a project, or to get total hours on all projects by a certain person EDIT: Another requirement would be that each timesheet for a particular time period for every

Best Database Change Control Methodologies

偶尔善良 提交于 2019-12-20 09:57:51
问题 As a database architect, developer, and consultant, there are many questions that can be answered. One, though I was asked recently and still can't answer good, is... "What is one of, or some of, the best methods or techniques to keep database changes documented, organized, and yet able to roll out effectively either in a single-developer or multi-developer environment." This may involve stored procedures and other object scripts, but especially schemas - from documentation, to the new

cant get data from database after multiple schema declared (mongoose + express + mongodb

旧街凉风 提交于 2019-12-20 09:37:49
问题 I'm new to node.js and I am having problem accessing to the when multiple mongoose schema were declare. //schema.js in model var mongoose = require('mongoose'); var Schema = mongoose.Schema , ObjectId = Schema.ObjectId; //User Schema var userSchema = new Schema({ id: ObjectId, firstname: {type: String, require: true}, lastname: {type: String, require: true}, username: {type: String, unique: true, require: true}, password: {type: String, require: true}, role: {type: [String], require: true} })

PostgreSQL's schemas for multi-tenant applications

◇◆丶佛笑我妖孽 提交于 2019-12-20 08:49:39
问题 I'm learning about multi-tenant applications and how PostgreSQL's schemas can be used for this. Researching the subject, I ended up finding an article in which the author describes a poor experience when using PostgreSQL's schemas in multi-tenant applications. The main problems would be having bad performance for migrations and high usage of database resources. It seems like having only one schema (sharing the tables among the tenants) would lead to better performance than having one

mongoose 笔记

无人久伴 提交于 2019-12-20 08:41:00
一:参考学习网址 npm: https://www.npmjs.com/package/mongoose 官网API:http://mongoosejs.com/docs/guide.html 二:在node中的连接 1.先要安装mongoose: npm i mongoose --save 2.如何连接: var mongoose = require('mongoose'); //连接 mongoose.connect( ' 地址 ' ) //自己需要连接的数据库地址,如本机的test数据库,就是 mongoose.connect('mongodb://localhost/test') var db = mongoose.connection; //连接成功 db.on('connected', function () { console.log('Mongoose connection open to ' + DB_URL); }); //连接异常 db.on('error',function (err) { console.log('Mongoose connection error: ' + err); }); //连接断开 db.on('disconnected', function () { console.log('Mongoose connection

How to Guess schema in Mysqlinput on the fly in Talend

大兔子大兔子 提交于 2019-12-20 07:13:30
问题 I've build a job that copy data from a mysql db table to b mysql table. The table columns are the same except sometimes a new column can be added in table a db. i want to retrieve all the columns from a to b but only those that exists in table b. i was able to put in the query specific select colume statment that exists in table b like: select coulmn1,column2,columns3... from table a the issue is if i add a new column in b that matches a the talend job schema in Mysqlinput should be changed