cmdb relationship mapping

ORM Entity Relationship Mapping, the relationship between data tables and tables in a database, is manifested by the relationship between entity bean and entity bean, and the operation of database by manipulating entity Bean is realized. ORM (Object-relation-map), where Object represents the entity bean,relation rep

　　on A study Hibernate The basic mapping, that is, single-table mapping, it is easy to understand, but for the relational database, the existence of a relationship between tables is not very small, the relationship between the database is established through the main foreign key , the reaction to Hibernate How do you

ORM: (object/relation Mapping Object Relational mapping) the most famous ORM model should be the JAVA hibernate. ORM Basic Concepts: Object-Relational mapping (relational Mapping, or ORM) is a technique for solving the mismatch between object-oriented and relational databases. To put it simply, ORM uses __set __get __c

next to the "Persistent API (JPA) series (vii) Entity Relationship Mapping (ORM) Single-table mapping @idclass"This article describes the Federated primary key: Using @embeddedid to embed an external primary keyThe above is a reference to the external primary key via @idclass, and the Federated primary Key can also be used Embedded PRIMARY Key Alternative. 1) New

() {return man;} public void Setman (String mans) {This.man = man;} Public String Getwoman () {return woman;} public void Setwoman (String woman) {This.woman = woman;} Public familypk () {}public familypk (string man, String woman) {This.man = Man;this.woman = woman;} @Overridepublic int hashcode () {final int prime = 31;int result = 1;result = Prime * result + (man = null)? 0:man.has Hcode ()); result = Prime * result + ((woman = = null)? 0:woman.hashcode ()); return result; @Overridepublic bo

maintenance of relationship changes, if the inverse=true is to maintain the relationship between the change of the right reversal, to the other side to deal with, The general one side does not maintain the association relations all is to make the many end to maintain namely sets Inverse=true, in Many-to-one inverse does not support the configuration, the default namely handles the correlation relation the

About the database crud (create retrieve update delete) Automation AIDS, the leader must be an ORM (object-relational mapping) tool. Hibernate,activerecord can be said to play a Java,ruby language philosophy to the ultimate tool, the other dynamic language Orm tools mostly refer to both the architecture and model, use their premise is to grasp the object-oriented basis (object-oriented 3 Principles and applications) and database application basics (d

Example: Amazon Online shopping mall can sell a lot of things, such as books, electrical appliances, fruits, etc., Then we use object-oriented concept to abstract a commodity class, he has a common property of the commodity, such as the shelf time, the current price, preferential price waiting, The commodity can inherit the commodity class, can also retain their own properties, such as product name and so On. This relationship is called Inheritance.As

Discuz DB Layer cross-Library mapping relationship table name prefix a new bug,discuz relationship table generated after a bug fix New logic introduces a new bug that causes the table name prefix mapping to be confusing when connecting across multiple libraries, and requires a more logical fix. http:

MyEclipse, generate a Get, set methodTwo: Write Hibernate's hbm.xml mapping file, the normal attribute segmentation on both screens to write on the line, The main entity is the corresponding relationship between entities(1) The user class and the user information class is one-to-one, I use the Foreign Key Association (that is, the user table contains the user information table of the primary key ID)In the

Wo rker0_. Wid=worker0_1_.id where worker0_. wid=?//parameter ID to join the Worker's table in the WID field */}Test Page test.jspResults:HQL for console printing:Hibernate:select Student_. Sid, student_1_. Name as name0_, student_1_. Sex as sex0_, student_1_. Age as age0_, Student_. Sno as Sno1_, Student_. School as school1_ from student student_ inner join person student_1_ on Student_. Sid=student_1_.id where Student_. Sid=? Hibernate:insert into who (Name, Sex, age, ID) VALUES (?,?,?,?) Hib

The open source Framework's mapping of the data layer includes the mapping of entities and the mapping of relationships, where the mapping of relationships is the most complex. 　　If you have a bad relationship mapping, you simply

????? In the previous article, we mapped a single entity class through the annotation pair, but the entity classes are related to each other in the project, this article is the different relation angle from the entity class, the specific learning how to map their association, the main content is as follows: One-way relational mapping A one-way, many-to-one correlation relationship

One, hibernate many-to-one association mapping: is the "many" at the end of the foreign key, pointing to the one end.For example, multiple students corresponding to a class, a number of users corresponding to a level, etc., are many-to-one relationship.　　1. "Many" end entities add variables and Getter,setter methods that refer to "one" end entities.For example, multiple students corresponding to a class, in

0, what is eloquenteloquent is Laravel's ' ORM ', the ' Object Relational Mapping ', the object-relational mapping. ORM appears to help us make the operation of the database easier. Eloquent lets a ' model class ' correspond to a database table, and encapsulates a lot of ' function ' at the bottom so that the model class can be easily invoked.Take a look at the following code: ' Protected $fi

A one-to-one relationship mapping is a reference that both sides of the relationship contain each other. In fact, a one-to-one relationship in life is also very common, such as people and identity cards, students and school numbers, are one-to-one relationship

with @attributeoverrides@SecondaryTables Multiple table mappings@SecondaryTable Define the secondary table mappings and @secondarytables nested with@GeneratedValue identifier generation policy, default autoTable-Table Relationship Mapping@OneToOne: One-to-one mapping. It contains five properties:Targetentity: Associated Target classCascade: cascading operation w

Many-to-many relationships (student student, course course)The definition of student class and the configuration of HBM files are as follows1 Public class Student {2 Private int ID; 3 Private String name; 4 Private New Hashset(); 5 }1 XML version= "1.0" encoding= "UTF-8"?>2 DOCTYPE hibernate-mapping Public3 "-//hibernate/hibernate Mapping DTD 3.0//en"4 "Http://hibernate.sourceforge.net/hibernat

Yesterday, we shared a one -way, one-way, one- to - Many mapping relationship in Hibernate, and today we share the many-to-many mappings in hibernate in two directions .This time we take the project and the staff to raise a chestnut, because you can imagine, in the real environment, a project must be corresponding to a number of employees, which undoubtedly,At the same time, a comparison of cattle employee