hibernate mapping

Hibernate for the operation of the database, all the use of object-oriented thinking to understand and implement. The general map of the individual table, I believe that everyone has no problem, but for some of the special relationship between tables, Hibernate provides some unique way to simplify it. Today we'll talk about the correlation mapping for Many-to-ma

The previous article discusses a one-to-many mapping in detail, and there are a lot of problems with unidirectional mappings in a pair of mappings, so it is not recommended to use a two-way association to optimize the relationship if one-to-many mappings are to be considered, which is essentially using one, one-way many-to-many Still in accordance with the previous article format to discuss, first of all, the relationship between the object, a one-w

A: basic mapping: A data table corresponding to an entity class, called this mapping as the basic mappingTwo : relational mapping: It is the mapping that deals with the relationship between n related objects and n related tables on the basis of basic mappings. Mainly divided into the following types: One-Way A

The previous article discusses a one-to-many mapping in detail, and there are a lot of problems with unidirectional mappings in a pair of mappings, so it is not recommended to use a two-way association to optimize the relationship if one-to-many mappings are to be considered, which is essentially using one, one-way many-to-manyStill in accordance with the previous article format to discuss, first of all, the relationship between the object, a one-way

Last Post hibernate from getting started to mastering (eight) One-to-many one-way correlation mapping, we explained a pair of multiple one-way mapping of the relevant content, this time we explain a pair of multiple two-way mapping related content. One-to-many Two-Way Association mappings One-to-many Two-Way associat

to the underlying database, but instead manipulate persisted objects in an object-oriented manner, while the ORM framework translates these object-oriented operations into the underlying SQL operations.The only function of the ORM tool is to convert the persisted object to the operation of the database by saving, deleting, modifying and so on. From then on, programmers can manipulate persisted objects in an object-oriented manner, while the ORM Framework is responsible for translating the corre

The mapping file is configured in spring Applicationcontext.xml, typically in the bean instance of The first type:As configuration files become more and more cumbersome to read and modify, and XML-based configuration can lead to input errors, you may be wasting half a day searching for errors because of a single character error.The second type:In this case, you can use the Localsessionfactorybean "Mappingdirectorylocations" property to define the

Hibernate Relational Mapping Directory│├─ One-Way Association│├─One way foreign key unidirectional Association│├─One-to- primary key one-way Association│├─Single connection table one-way Association│├─one-to-many foreign key unidirectional association│├─one-to-many connection Table unidirectional Association│├─multi-to-one foreign key one-way Association│├─multiple-to-one connection table one-way Associatio

,Joincolumns, Joincolumn, InversejoincolumnXml:Bidirectional:Note: Set @manytomany (mappedby= "") on a one-way basis on the other side of the collectionXML: Also set E. Component mapping: A bean that is part of a table, not as an entity, such as a student ID as part of a student entity;Component references in entities add @embeddedUsing Note: (1) bidirectional correlation Mappedby attribute must be set, XML with Indicates that the relationship is domi

; } Public voidsetName (String name) { This. Name =name; }}@Entity Public class extends Person { privateint score; Public int Getscore () { return score; } Public void setscore (int score) { this. score = score; } } @Entity Public class extends Person { private String title; Public String GetTitle () { return title; } Public void Settitle (String title) { this. title = title; } } c) Each sub-Class A table join

Hibernet MappingCollection mappings:The property fields of the class are collections.SetMapping of Set collection propertiesName specifies the properties of the set collection to be mappedTable to which to map table collection propertiesKEY specifies the foreign key field of the collection table (t_address)element specifies other fields of the collection tableType element, be sure to specifyList--List Collection MappingsLIST-INDEX Specifies the name of the row sequence (because the list collecti

Group-user:one to manyIn group class, we had a set1.Annotation@Entity @table (name= "X_group") Public classGroup {Private intID; PrivateString name; //For one-to-many illustration PrivateSetNewHashset(); @Id @GeneratedValue Public intgetId () {returnID; } Public voidSetId (intID) { This. ID =ID; } @OneToMany @JoinColumn (name= "GroupId") PublicSetgetusers () {returnusers; } Public voidSetusers (setusers) { This. Users =users; } PublicString GetName () {returnname;

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

3 in1.subclass classname= "Worker"Table= "worker"Discriminator-value= "worker"> IDname= "id"type= "Java.lang.Integer"> columnname= "ID"/> Generatorclass= "Native"/> ID> discriminatorcolumn= "type"type= "string">discriminator> Propertyname= "Name"> Property> Subclassname= "Driver"Discriminator-value= "Driver"> Propertyname= "Car"> Property> Subclass> class>2.joined-subclass classname= "Animal"Table= "Animal">

Student and teacher are many-to-many relationships (only 2 entity classes built)1 Public class Student {2 Private int ID; 3 Private String name; 4 Private New Hashset(); 5 }1 Public class Teacher {2 Private int ID; 3 Private String name; 4 Private New Hashset(); 5 }Many-to-many1 Package= "Entity" >2className= "Student" >34class= "Native"/>5678Table property of the label: Configure the name of the relationship table9Column property of the Label: foreign key field nam

() { //Create an Employee object EMP emp=new emp (); Emp.setempname ("Unknown"); Create Project Object Project pro=new project (); Pro.setpname ("garden"); Add an Employee object to the project conversely pro.getemps (). Add (EMP); Emp.getpros (). Add (pro); Save Session.save (pro); Session.save (EMP);

Describes the role of each node in ActionName.hbm.xml: Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. Hibernate Mapping Table Detailed

(calendar.second) + i);Totaltradeamt = Totaltradeamt + Onetomanyformanymodel.gettradeamt ();if (onetomanyforonemodel.getdetails () = = null) {Onetomanyforonemodel.setdetails (New hashsetSystem.out.println ("Create hashset}Onetomanyforonemodel.getdetails (). Add (Onetomanyformanymodel);}??Onetomanyforonemodel.settotaltradeamt (Totaltradeamt);Onetomanyforonemodel.setmodifytime (New Date ());??Curtransaction = Hibernateutils.begintransaction (cursession);Cursession.persist (Onetomanyforonemodel);C

Annotationconfiguration (). Configure (). Buildsessionfactory ();} @AfterClasspublic static void Afterclass () {sessionfactory.close ();} @Testpublic void Testsave () {Org o = new org (); O.setname ("head Office"); org O1 = new org (); O1.setname ("Branch 1"); Org o2 = new org (); O 2.setName ("Branch 2"), org o11 = new Org (), O11.setname ("branch 1 under Department 1"), org o12 = new Org (), O12.setname ("branch 1 under Department 2"), O. GetChildren (). Add (O1), O.getchildren (). Add (O2);