Ruhezustand - Eins-zu-Eins-Beispiel (Anmerkung)

In diesem Lernprogramm wird die gesamte Infrastruktur des vorherigen "http://www.example.com/hibernate/hibernate-one-to-one-relationship-example/[Hibernate one to one Relationship Example - XML Mapping]" wiederverwendet. Tutorial, erweitern Sie es, um Hibernate / JPA-Annotation zu unterstützen.

Projektstruktur

Siehe die endgültige Projektstruktur dieses Tutorials.

project structure

Note
Seit Hibernate 3.6 werden Anmerkungscodes in das Hibernate-Kernmodul zusammengeführt, sodass die Datei“previous pom.xml wiederverwendet werden kann.

1. Eins-zu-eins-Tabellenbeziehung

Siehe die vorherige Eins-zu-Eins-Tabellenbeziehung erneut.

one to one relationship

2. Hibernate Model Class

Erstellen Sie zwei Modellklassen -Stock.java undStockDetail.java, und fügen Sie den Anmerkungscode ein.

Datei: 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;
    }

}

Datei: 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. Ruhezustand-Konfigurationsdatei

Fügt kommentierte KlassenStock.java undStockDetail.java in Ihre Hibernate-Konfigurationsdatei sowie MySQL-Verbindungsdetails ein.

Datei: hibernate.cfg.xml






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

4. Starte es

Wenn Sie es ausführen, fügt Hibernate eine Zeile in die Tabelle STOCK und eine Zeile in die Tabelle STOCK_DETAIL ein.

Datei: 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");
    }
}

Ausgabe

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

Laden Sie es herunter -Hibernate-one-to-one-annotation,zip (9KB)

Referenz

Hibernate-Dokumentation - Eins-zu-eins-Beziehung

TOC

Ruhezustand - Eins-zu-Eins-Beispiel (Anmerkung)