TOC

Hibernate - Exemple un-à-un (annotation)

Hibernate - Exemple One-to-One (Annotation)

Dans ce didacticiel, il réutilisera toute l'infrastructure du précédent "http://www.example.com/hibernate/hibernate-one-to-one-relationship-example/[Hibernate un à un exemple de relation - mappage XML]" tutoriel, améliorez-le pour prendre en charge l'annotation Hibernate / JPA.

Structure du projet

Voir la structure finale du projet de ce tutoriel.

project structure

Note
Depuis Hibernate 3.6, les codes d'annotation sont fusionnés dans le module principal d'Hibernate, ainsi, le fichier“previous pom.xml peut être réutilisé.

1. Relation de table «un à un»

Voir à nouveau la relation précédente d'une table.

one to one relationship

2. Classe de modèle Hibernate

Créez deux classes de modèle -Stock.java etStockDetail.java, et placez le code d'annotation à l'intérieur.

Fichier: Stock.java 

package com.example.stock;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

@Entity
@Table(name = "stock", catalog = "exampledb", uniqueConstraints = {
        @UniqueConstraint(columnNames = "STOCK_NAME"),
        @UniqueConstraint(columnNames = "STOCK_CODE") })
public class Stock implements java.io.Serializable {

    private Integer stockId;
    private String stockCode;
    private String stockName;
    private StockDetail stockDetail;

    public Stock() {
    }

    public Stock(String stockCode, String stockName) {
        this.stockCode = stockCode;
        this.stockName = stockName;
    }

    public Stock(String stockCode, String stockName, StockDetail stockDetail) {
        this.stockCode = stockCode;
        this.stockName = stockName;
        this.stockDetail = stockDetail;
    }

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "STOCK_ID", unique = true, nullable = false)
    public Integer getStockId() {
        return this.stockId;
    }

    public void setStockId(Integer stockId) {
        this.stockId = stockId;
    }

    @Column(name = "STOCK_CODE", unique = true, nullable = false, length = 10)
    public String getStockCode() {
        return this.stockCode;
    }

    public void setStockCode(String stockCode) {
        this.stockCode = stockCode;
    }

    @Column(name = "STOCK_NAME", unique = true, nullable = false, length = 20)
    public String getStockName() {
        return this.stockName;
    }

    public void setStockName(String stockName) {
        this.stockName = stockName;
    }

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "stock", cascade = CascadeType.ALL)
    public StockDetail getStockDetail() {
        return this.stockDetail;
    }

    public void setStockDetail(StockDetail stockDetail) {
        this.stockDetail = stockDetail;
    }

}

Fichier: StockDetail.java 

package com.example.stock;

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.Parameter;

@Entity
@Table(name = "stock_detail", catalog = "exampledb")
public class StockDetail implements java.io.Serializable {

    private Integer stockId;
    private Stock stock;
    private String compName;
    private String compDesc;
    private String remark;
    private Date listedDate;

    public StockDetail() {
    }

    public StockDetail(Stock stock, String compName, String compDesc,
            String remark, Date listedDate) {
        this.stock = stock;
        this.compName = compName;
        this.compDesc = compDesc;
        this.remark = remark;
        this.listedDate = listedDate;
    }

    @GenericGenerator(name = "generator", strategy = "foreign",
    parameters = @Parameter(name = "property", value = "stock"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(name = "STOCK_ID", unique = true, nullable = false)
    public Integer getStockId() {
        return this.stockId;
    }

    public void setStockId(Integer stockId) {
        this.stockId = stockId;
    }

    @OneToOne(fetch = FetchType.LAZY)
    @PrimaryKeyJoinColumn
    public Stock getStock() {
        return this.stock;
    }

    public void setStock(Stock stock) {
        this.stock = stock;
    }

    @Column(name = "COMP_NAME", nullable = false, length = 100)
    public String getCompName() {
        return this.compName;
    }

    public void setCompName(String compName) {
        this.compName = compName;
    }

    @Column(name = "COMP_DESC", nullable = false)
    public String getCompDesc() {
        return this.compDesc;
    }

    public void setCompDesc(String compDesc) {
        this.compDesc = compDesc;
    }

    @Column(name = "REMARK", nullable = false)
    public String getRemark() {
        return this.remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    @Temporal(TemporalType.DATE)
    @Column(name = "LISTED_DATE", nullable = false, length = 10)
    public Date getListedDate() {
        return this.listedDate;
    }

    public void setListedDate(Date listedDate) {
        this.listedDate = listedDate;
    }

}

3. Hibernate Configuration File

Place les classes annotéesStock.java etStockDetail.java dans votre fichier de configuration Hibernate, ainsi que les détails de connexion MySQL.

Fichier: hibernate.cfg.xml 






    com.mysql.jdbc.Driver
    jdbc:mysql://localhost:3306/exampledb
    root
    password
    org.hibernate.dialect.MySQLDialect
    true

4. Exécuter

Exécutez-le, Hibernate insérera une ligne dans la table STOCK et une ligne dans la table STOCK_DETAIL.

Fichier: App.java 

package com.example;

import java.util.Date;

import org.hibernate.Session;

import com.example.stock.Stock;
import com.example.stock.StockDetail;
import com.example.util.HibernateUtil;

public class App {
    public static void main(String[] args) {
        System.out.println("Hibernate one to one (Annotation)");
        Session session = HibernateUtil.getSessionFactory().openSession();

        session.beginTransaction();

        Stock stock = new Stock();

        stock.setStockCode("7052");
        stock.setStockName("PADINI");

        StockDetail stockDetail = new StockDetail();
        stockDetail.setCompName("PADINI Holding Malaysia");
        stockDetail.setCompDesc("one stop shopping");
        stockDetail.setRemark("vinci vinci");
        stockDetail.setListedDate(new Date());

        stock.setStockDetail(stockDetail);
        stockDetail.setStock(stock);

        session.save(stock);
        session.getTransaction().commit();

        System.out.println("Done");
    }
}

Sortie 

Hibernate one to one (Annotation)
Hibernate: insert into exampledb.stock (STOCK_CODE, STOCK_NAME) values (?, ?)
Hibernate: insert into exampledb.stock_detail
(COMP_DESC, COMP_NAME, LISTED_DATE, REMARK, STOCK_ID) values (?, ?, ?, ?, ?)
Done

Téléchargez-le -Hibernate-one-to-one-annotation,zip (9 Ko)

Référence

  1. Documentation Hibernate - relation un à un

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