trigamous relationship

Recently on the watercress will "friend" two-way relationship, change to "concern" one-way relationship, there are some disputes between users. Here I would like to express my understanding of this, I would like to use a number of nodes diagram. (The painting is simpler, I can not imagine to express clearly, possible) 1, "two-way" to confirm the relationship, i

The contents of this section Introduced Type of collection in NHibernate Establish a parent-child relationship Parent-Child Association mappings Conclusion Introduced Through the introduction of several previous articles, basically understand the nhibernate, but in the nhibernate mapping relationship is the highlight of NHibernate, but also the most difficult to master technology. From this beginning

Label:from the database is a backup of the primary database, when the primary database changes from the database to be updated, these database software can design the update cycle. This is a means of improving information security. The master-slave database server is not geographically located, and the database can be saved when an accident occurs. relationship structure of the primary foreign key:1, one-to-one, without reference to the primary foreig

Everyone, while learning Java, mostly use the IDE environment such as Eclipse, but this is not good, and the package access rights, is also a key step of framework control in Java,Only if you really have to master. The relationship between Java files and the package can really grasp the relationship, and help to write a good framework;Less nonsense, first on the code;This is with the package com.xuyaowen.de

There are two kinds of connection relationships between routers in Ospf: the neighbor relationship and the adjacent relationship. This blog post will detail the establishment and working principles of these two relationships. If two routers share a Public Data Link (there is no other router between the two routers, or there is a virtual connection between the two routers), and the parameters specified in th

There are various object relationships in the real environment, and special relationship type descriptors can be used to describe these relationships.For example:1. The square is a form of shape, you can use "is-a" to describe the relationship between the square and the shape.2. The car has a steering wheel and can use "has-a" to describe the relationship between

Java Tour (vi)--single case design pattern, inheritance extends, aggregation relationship, child parent class variable relationship, Super, overlay Java also more and more deep, everyone refueling it! Let's take a step I. Single-CASE design mode What is design mode? There are 23 design patterns in Java, the most effective way to solve a problem Single Case design

In this chapter, the main discussion is that if the edges in the network are represented by ±, + means friends,-how will the network be distributed?Micro-individual strategies tend to show regularity on the macro level (Do you think Adam Smith, your late bread is not because of the gifts of others, but out of everyone's consideration of their own interests, the individual for their own interests is the social macro can be stable operation), in the social network is also such a distribution, The

Demo Video: http://u.115.com/file/f2b86d8eab Demonstration highlightsThis Demo Video mainly describes how to use the object relation designer provided by Vs to establish the relationship between object classes.Although this tool can automatically establish the relationship between entity classes and object classes in the object model based on the relationship be

After restoring the database backed up by SQL2000 to sql2005, the "database relationship diagram" prompt: the database does not have a valid owner, so you cannot install the database relationship diagram support object "SOLUTION After restoring the database backed up by SQL2000 to sql2005, the "database relationship diagram" prompt: the database does not have a

Jpa Bidirectional Multi-to-Multi-relationship, jpa Bidirectional Multi-to-Relationship Compared with other associations, many-to-many relationships are a little more complex. This complexity is mainly reflected in the understanding of such associations. Different from other associations, this association has an intermediate table, and the operation is a little more complicated. Let's take a look. 1. entity

the project files in the article have been put on GitHub, welcome everyone to Follow,star,Address: Https://github.com/lawlite19/SmartEducationA: Design entity, I am here through the UML design, and then directly can generate Java entity classes (easy to see the relationship of each class)(1) User login class users and User details class Userdetails is a one-to-one relationship;(2) User details class Userde

)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{ NSLog(@"NYViewController---willRotateToInterfaceOrientation");}- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ NSLog(@"NYViewController---didRotateFromInterfaceOrientation");}If we write these two methods to the three controller of one and three, the corresponding screen rotation, only the main controller print this method, but the

The parent-child relationship of the view and the parent-child relationship of the controller are displayed in the controller view of iOS. I. Effect Ii. project code The Demo uses several controllers to draw different xib and drag a few spaces at will, mainly switching between several buttons. The main code is as follows: /// NYViewController. m // view display of the controller /// Created by apple on 14-1

The new BUG that occurs after the DiscuzDB layer cross-database ing relationship table name prefix bug is fixed. A new BUG occurs when the DiscuzDB layer cross-database ing relational table name prefix bug is fixed. the new logic of the discuz relational table introduces a new bug, which may cause cross-database connection, A new BUG is generated after the table name prefix ing bug is fixed in the Discuz DB layer cross-database ing

Based on the primary key mapping 1-1 correlation relationship and based on the foreign key mapping 1-1 correlation relationship, the main difference is that the configuration map file will be differentTwo persistence classes for manager and department1: Based on primary key mapping 1-1 Association relationship1) mapping files for entities that generate primary keys using the primary key of other persisted c

Description of the relationship between width and padding, and the relationship between widthpadding Description of the relationship between width and padding:This topic describes the relationship between width and padding.The main problem is that the width package does not contain padding. In fact, their

, an employee table and a department table need to be created, stores all department and employee information, and these two tables are associated with each other by using a foreign key, so that all employees of the department can be queried Based on the department name, at the same time, the employee's department can be queried based on the employee's name. It is not hard to see that the relationship between departments and employees is one-to-many.

The relationship between PHP and MySQL and some simple operations, phpmysql relationships Post Code First Php$con=mysql_connect("localhost", "root", "root");//Link Database if(!$con){ die(' Connection Failed! ' .Mysql_error());//Judging whether it is successful } /*if (mysql_query ("Create DATABASE TestDB", $con)) {//via mysql_query query or send command echo "create TestDB success"; } e

table column, identity self-increment - IDname= "Id"> Generate primary Key - Generatorclass= "UUID">Generator> ID> Name: attribute names in entities, Length: Lengths, Column: Fields in table (Entity attributes and fields can be omitted), type: types (can not be written automatically by Hiberbate) - Propertyname= "Name" /> building a collection with data from an intermediate table - Setname= "Stus"Table= "M2m_1_stu_cour"Cas