Hibernate - Exemple un-à-plusieurs (annotation)

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

Structure du projet

Passez en revue la nouvelle structure de projet de ce didacticiel.

one to many annotation folder

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

1. Relation de table «un à plusieurs»

Voir à nouveau la relation précédente à plusieurs tables.

one to many table relationship

2. Classe de modèle Hibernate

Mettez à jour les classes de modèle précédentes -Stock.java etStockDailyRecord.java, et définissez le code d'annotation à l'intérieur.

Fichier: Stock.java

package com.example.stock;

import java.util.HashSet;
import java.util.Set;
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.OneToMany;
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 Set stockDailyRecords = new HashSet(
            0);

    public Stock() {
    }

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

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

    @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;
    }

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "stock")
    public Set getStockDailyRecords() {
        return this.stockDailyRecords;
    }

    public void setStockDailyRecords(Set stockDailyRecords) {
        this.stockDailyRecords = stockDailyRecords;
    }

}

Fichier: StockDailyRecord.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 static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.UniqueConstraint;

@Entity
@Table(name = "stock_daily_record", catalog = "exampledb",
uniqueConstraints = @UniqueConstraint(columnNames = "DATE"))
public class StockDailyRecord implements java.io.Serializable {

    private Integer recordId;
    private Stock stock;
    private Float priceOpen;
    private Float priceClose;
    private Float priceChange;
    private Long volume;
    private Date date;

    public StockDailyRecord() {
    }

    public StockDailyRecord(Stock stock, Date date) {
        this.stock = stock;
        this.date = date;
    }

    public StockDailyRecord(Stock stock, Float priceOpen, Float priceClose,
            Float priceChange, Long volume, Date date) {
        this.stock = stock;
        this.priceOpen = priceOpen;
        this.priceClose = priceClose;
        this.priceChange = priceChange;
        this.volume = volume;
        this.date = date;
    }

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

    public void setRecordId(Integer recordId) {
        this.recordId = recordId;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "STOCK_ID", nullable = false)
    public Stock getStock() {
        return this.stock;
    }

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

    @Column(name = "PRICE_OPEN", precision = 6)
    public Float getPriceOpen() {
        return this.priceOpen;
    }

    public void setPriceOpen(Float priceOpen) {
        this.priceOpen = priceOpen;
    }

    @Column(name = "PRICE_CLOSE", precision = 6)
    public Float getPriceClose() {
        return this.priceClose;
    }

    public void setPriceClose(Float priceClose) {
        this.priceClose = priceClose;
    }

    @Column(name = "PRICE_CHANGE", precision = 6)
    public Float getPriceChange() {
        return this.priceChange;
    }

    public void setPriceChange(Float priceChange) {
        this.priceChange = priceChange;
    }

    @Column(name = "VOLUME")
    public Long getVolume() {
        return this.volume;
    }

    public void setVolume(Long volume) {
        this.volume = volume;
    }

    @Temporal(TemporalType.DATE)
    @Column(name = "DATE", unique = true, nullable = false, length = 10)
    public Date getDate() {
        return this.date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

}

3. Hibernate Configuration File

Place les classes annotéesStock.java etStockDailyRecord.java danshibernate.cfg.xml comme ceci:

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_DAILY_RECORD.

Fichier: App.java

package com.example;

import java.util.Date;

import org.hibernate.Session;

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

public class App {
    public static void main(String[] args) {

        System.out.println("Hibernate one to many (Annotation)");
    Session session = HibernateUtil.getSessionFactory().openSession();

    session.beginTransaction();

    Stock stock = new Stock();
        stock.setStockCode("7052");
        stock.setStockName("PADINI");
        session.save(stock);

        StockDailyRecord stockDailyRecords = new StockDailyRecord();
        stockDailyRecords.setPriceOpen(new Float("1.2"));
        stockDailyRecords.setPriceClose(new Float("1.1"));
        stockDailyRecords.setPriceChange(new Float("10.0"));
        stockDailyRecords.setVolume(3000000L);
        stockDailyRecords.setDate(new Date());

        stockDailyRecords.setStock(stock);
        stock.getStockDailyRecords().add(stockDailyRecords);

        session.save(stockDailyRecords);

    session.getTransaction().commit();
    System.out.println("Done");
    }
}

Sortie

Hibernate one to many (Annotation)
Hibernate:
    insert
    into
        exampledb.stock
        (STOCK_CODE, STOCK_NAME)
    values
        (?, ?)
Hibernate:
    insert
    into
        exampledb.stock_daily_record
        (DATE, PRICE_CHANGE, PRICE_CLOSE, PRICE_OPEN, STOCK_ID, VOLUME)
    values
        (?, ?, ?, ?, ?, ?)
Done

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

Référence

Documentation Hibernate - relation un à plusieurs

TOC

Hibernate - Exemple un-à-plusieurs (annotation)