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February 17, 2018 17:53
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One to many relationship hibernate
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1 -------> many | |
Stock -------> Stock_Daily_Record | |
@OneToMany(fetch = FetchType.LAZY, mappedBy = "stock") -------> @ManyToOne(fetch = FetchType.LAZY) | |
@JoinColumn(name = "STOCK_ID", nullable = false) | |
package com.mkyong.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 = "mkyongdb", 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<StockDailyRecord> stockDailyRecords = new HashSet<StockDailyRecord>( | |
0); | |
public Stock() { | |
} | |
public Stock(String stockCode, String stockName) { | |
this.stockCode = stockCode; | |
this.stockName = stockName; | |
} | |
public Stock(String stockCode, String stockName, | |
Set<StockDailyRecord> 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<StockDailyRecord> getStockDailyRecords() { | |
return this.stockDailyRecords; | |
} | |
public void setStockDailyRecords(Set<StockDailyRecord> stockDailyRecords) { | |
this.stockDailyRecords = stockDailyRecords; | |
} | |
} | |
--------------------------------------------------------------------------------------------------------------- | |
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 = "mkyongdb", | |
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 | |
Puts annotated classes Stock.java and StockDailyRecord.java in hibernate.cfg.xml like this : | |
File : hibernate.cfg.xml | |
<?xml version="1.0" encoding="utf-8"?> | |
<!DOCTYPE hibernate-configuration PUBLIC | |
"-//Hibernate/Hibernate Configuration DTD 3.0//EN" | |
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> | |
<hibernate-configuration> | |
<session-factory> | |
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> | |
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mkyongdb</property> | |
<property name="hibernate.connection.username">root</property> | |
<property name="hibernate.connection.password">password</property> | |
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> | |
<property name="show_sql">true</property> | |
<mapping class="com.mkyong.stock.Stock" /> | |
<mapping class="com.mkyong.stock.StockDailyRecord" /> | |
</session-factory> | |
</hibernate-configuration> | |
4. Run It | |
Run it, Hibernate will insert a row into the STOCK table and a row into the STOCK_DAILY_RECORD table. | |
File : App.java | |
package com.mkyong; | |
import java.util.Date; | |
import org.hibernate.Session; | |
import com.mkyong.stock.Stock; | |
import com.mkyong.stock.StockDailyRecord; | |
import com.mkyong.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"); | |
} | |
} |
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