表脚本：
DROP TABLE IF EXISTS STOCK; CREATE TABLE STOCK ( STOCK_ID INT(10) NOT NULL, STOCK_CODE VARCHAR(10) NOT NULL, STOCK_NAME VARCHAR(20) NOT NULL, PRIMARY KEY (STOCK_ID,STOCK_CODE), KEY STOCK_CODE_IDX (STOCK_CODE) );
DROP TABLE IF EXISTS STOCK_DAILY_RECORD;
CREATE TABLE STOCK_DAILY_RECORD ( RECORD_ID INT(10) NOT NULL, STOCK_CODE VARCHAR(10) NOT NULL, PRICE_OPEN FLOAT(6,2) DEFAULT NULL, PRICE_CLOSE FLOAT(6,2) DEFAULT NULL, PRICE_CHANGE FLOAT(6,2) DEFAULT NULL, VOLUME BIGINT(20) DEFAULT NULL, STOCK_ID INT(10) NOT NULL, PRIMARY KEY (RECORD_ID,STOCK_CODE), KEY FK_STOCK_ID (STOCK_ID,STOCK_CODE), CONSTRAINT FK_STOCK_ID FOREIGN KEY (STOCK_ID,STOCK_CODE) REFERENCES STOCK (STOCK_ID,STOCK_CODE) ) ;
这是我可以填充实体类以在stock和stockdailyrecord表中保存值的主类：
package org.hibernate.HibernateEntity;
import org.hibernate.Session;
import com.model.Stock;
import com.model.StockDailyRecord;
import com.model.StockDailyRecordId;
import com.model.StockId;
/**
* Hello world!
*
*/
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();
StockId id = new StockId(2, "7052");
stock.setId(id);
stock.setStockName("PADINI");
StockDailyRecord stockDetail = new StockDailyRecord();
StockDailyRecordId id1 = new StockDailyRecordId(101, "7052");
stockDetail.setId(id1);
stockDetail.setPriceChange(200.0f);
stockDetail.setPriceClose(210.0f);
stockDetail.setPriceOpen(120.0f);
stockDetail.setVolume(12l);
stock.getStockDailyRecords().add(stockDetail);
stockDetail.setStock(stock);
session.save(stock);
//session.save(stockDetail);
session.getTransaction().commit();
System.out.println("Done");
}
}
使用嵌入了hibernate和id：
的复合键配置的实体类package com.model;
// Generated Jan 12, 2018 8:17:38 AM by Hibernate Tools 5.2.6.Final
import java.util.HashSet;
import java.util.Set;
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
/**
* Stock generated by hbm2java
*/
@Entity
@Table(name = "stock", catalog = "testdb")
public class Stock implements java.io.Serializable {
private StockId id;
private String stockName;
private Set<StockDailyRecord> stockDailyRecords = new HashSet<StockDailyRecord>(0);
public Stock() {
}
public Stock(StockId id, String stockName) {
this.id = id;
this.stockName = stockName;
}
public Stock(StockId id, String stockName, Set<StockDailyRecord> stockDailyRecords) {
this.id = id;
this.stockName = stockName;
this.stockDailyRecords = stockDailyRecords;
}
@EmbeddedId
@AttributeOverrides({ @AttributeOverride(name = "stockId", column = @Column(name = "STOCK_ID", nullable = false)),
@AttributeOverride(name = "stockCode", column = @Column(name = "STOCK_CODE", nullable = false, length = 10)) })
public StockId getId() {
return this.id;
}
public void setId(StockId id) {
this.id = id;
}
@Column(name = "STOCK_NAME", nullable = false, length = 20)
public String getStockName() {
return this.stockName;
}
public void setStockName(String stockName) {
this.stockName = stockName;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "stock")
@Cascade(CascadeType.ALL)
public Set<StockDailyRecord> getStockDailyRecords() {
return this.stockDailyRecords;
}
public void setStockDailyRecords(Set<StockDailyRecord> stockDailyRecords) {
this.stockDailyRecords = stockDailyRecords;
}
}
使用嵌入了hibernate和id：
的复合键配置的实体类package com.model;
// Generated Jan 12, 2018 8:17:38 AM by Hibernate Tools 5.2.6.Final
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
/**
* StockDailyRecord generated by hbm2java
*/
@Entity
@Table(name = "stock_daily_record", catalog = "testdb")
public class StockDailyRecord implements java.io.Serializable {
private StockDailyRecordId id;
private Stock stock;
private Float priceOpen;
private Float priceClose;
private Float priceChange;
private Long volume;
public StockDailyRecord() {
}
public StockDailyRecord(StockDailyRecordId id, Stock stock) {
this.id = id;
this.stock = stock;
}
public StockDailyRecord(StockDailyRecordId id, Stock stock, Float priceOpen, Float priceClose, Float priceChange,
Long volume) {
this.id = id;
this.stock = stock;
this.priceOpen = priceOpen;
this.priceClose = priceClose;
this.priceChange = priceChange;
this.volume = volume;
}
@EmbeddedId
@AttributeOverrides({ @AttributeOverride(name = "recordId", column = @Column(name = "RECORD_ID", nullable = false)),
@AttributeOverride(name = "stockCode", column = @Column(name = "STOCK_CODE", nullable = false, length = 10)) })
public StockDailyRecordId getId() {
return this.id;
}
public void setId(StockDailyRecordId id) {
this.id = id;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({
@JoinColumn(name = "STOCK_ID", referencedColumnName = "STOCK_ID", nullable = false, insertable = false, updatable = false),
@JoinColumn(name = "STOCK_CODE", referencedColumnName = "STOCK_CODE", nullable = false, insertable = false, updatable = 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;
}
}
使用嵌入了hibernate和id：
的复合键配置的实体类package com.model;
// Generated Jan 12, 2018 8:17:38 AM by Hibernate Tools 5.2.6.Final
import javax.persistence.Column;
import javax.persistence.Embeddable;
/**
* StockDailyRecordId generated by hbm2java
*/
@Embeddable
public class StockDailyRecordId implements java.io.Serializable {
private int recordId;
private String stockCode;
public StockDailyRecordId() {
}
public StockDailyRecordId(int recordId, String stockCode) {
this.recordId = recordId;
this.stockCode = stockCode;
}
@Column(name = "RECORD_ID", nullable = false)
public int getRecordId() {
return this.recordId;
}
public void setRecordId(int recordId) {
this.recordId = recordId;
}
@Column(name = "STOCK_CODE", nullable = false, length = 10)
public String getStockCode() {
return this.stockCode;
}
public void setStockCode(String stockCode) {
this.stockCode = stockCode;
}
public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof StockDailyRecordId))
return false;
StockDailyRecordId castOther = (StockDailyRecordId) other;
return (this.getRecordId() == castOther.getRecordId())
&& ((this.getStockCode() == castOther.getStockCode()) || (this.getStockCode() != null
&& castOther.getStockCode() != null && this.getStockCode().equals(castOther.getStockCode())));
}
public int hashCode() {
int result = 17;
result = 37 * result + this.getRecordId();
result = 37 * result + (getStockCode() == null ? 0 : this.getStockCode().hashCode());
return result;
}
}
使用嵌入了hibernate和id：
的复合键配置的实体类package com.model;
// Generated Jan 12, 2018 8:17:38 AM by Hibernate Tools 5.2.6.Final
import javax.persistence.Column;
import javax.persistence.Embeddable;
/**
* StockId generated by hbm2java
*/
@Embeddable
public class StockId implements java.io.Serializable {
private int stockId;
private String stockCode;
public StockId() {
}
public StockId(int stockId, String stockCode) {
this.stockId = stockId;
this.stockCode = stockCode;
}
@Column(name = "STOCK_ID", nullable = false)
public int getStockId() {
return this.stockId;
}
public void setStockId(int stockId) {
this.stockId = stockId;
}
@Column(name = "STOCK_CODE", nullable = false, length = 10)
public String getStockCode() {
return this.stockCode;
}
public void setStockCode(String stockCode) {
this.stockCode = stockCode;
}
public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof StockId))
return false;
StockId castOther = (StockId) other;
return (this.getStockId() == castOther.getStockId())
&& ((this.getStockCode() == castOther.getStockCode()) || (this.getStockCode() != null
&& castOther.getStockCode() != null && this.getStockCode().equals(castOther.getStockCode())));
}
public int hashCode() {
int result = 17;
result = 37 * result + this.getStockId();
result = 37 * result + (getStockCode() == null ? 0 : this.getStockCode().hashCode());
return result;
}
}
用于使用hibernate配置创建会话工厂的类：
package org.hibernate.HibernateEntity;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public static void shutdown() {
// Close caches and connection pools
getSessionFactory().close();
}
}
Stockdailyrecord 没有填充库存ID，请提供建议。
08:20:05.202 [main] DEBUG org.hibernate.pretty.Printer - listing entities:
08:20:05.203 [main] DEBUG org.hibernate.pretty.Printer - com.model.StockDailyRecord{priceChange=200.0, volume=12, priceClose=210.0, priceOpen=120.0, id=component[recordId,stockCode]{recordId=101, stockCode=7052}, stock=com.model.Stock#component[stockCode,stockId]{stockId=2, stockCode=7052}}
08:20:05.203 [main] DEBUG org.hibernate.pretty.Printer - com.model.Stock{stockName=PADINI, stockDailyRecords=[com.model.StockDailyRecord#component[recordId,stockCode]{recordId=101, stockCode=7052}], id=component[stockCode,stockId]{stockId=2, stockCode=7052}}
08:20:05.205 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
08:20:05.206 [main] DEBUG org.hibernate.SQL - insert into testdb.stock (STOCK_NAME, STOCK_CODE, STOCK_ID) values (?, ?, ?)
08:20:05.207 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - Executing batch size: 1
08:20:05.271 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
08:20:05.271 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
08:20:05.271 [main] DEBUG org.hibernate.SQL - insert into testdb.stock_daily_record (PRICE_CHANGE, PRICE_CLOSE, PRICE_OPEN, VOLUME, RECORD_ID, STOCK_CODE) values (?, ?, ?, ?, ?, ?)
08:20:05.277 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - Executing batch size: 1
08:20:05.300 [main] DEBUG org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
08:20:05.315 [main] DEBUG o.h.util.JDBCExceptionReporter - Could not execute JDBC batch update [insert into testdb.stock_daily_record (PRICE_CHANGE, PRICE_CLOSE, PRICE_OPEN, VOLUME, RECORD_ID, STOCK_CODE) values (?, ?, ?, ?, ?, ?)]
java.sql.BatchUpdateException: Field 'STOCK_ID' doesn't have a default value
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2024) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1449) ~[mysql-connector-java-5.1.15.jar:na]
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70) ~[hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268) ~[hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133) [hibernate-core-3.6.3.Final.jar:3.6.3.Final]
at org.hibernate.HibernateEntity.App.main(App.java:40) [classes/:na]
Caused by: java.sql.SQLException: Field 'STOCK_ID' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415) ~[mysql-connector-java-5.1.15.jar:na]
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1976) ~[mysql-connector-java-5.1.15.jar:na]
... 11 common frames omitted
08:20:05.316 [main] WARN o.h.util.JDBCExceptionReporter - SQL Error: 1364, SQLState: HY000
08:20:05.316 [main] ERROR o.h.util.JDBCExceptionReporter - Field 'STOCK_ID' doesn't have a default value
Exception in thread "main" org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
at org.hibernate.HibernateEntity.App.main(App.java:40)
Caused by: java.sql.BatchUpdateException: Field 'STOCK_ID' doesn't have a default value
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2024)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1449)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
... 8 more
Caused by: java.sql.SQLException: Field 'STOCK_ID' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1976)
... 11 more
答案 0 :(得分：0)
由于您没有填写字段STOCK_ID但是它在数据库中无法为空，因此引发了错误。添加子句AUTO_INCREMENT以防止表STOCK中的字段STOCK_ID：
STOCK_ID INT(10) NOT NULL AUTO_INCREMENT
和表STOCK_DAILY_RECORD中的RECORD_ID：
RECORD_ID INT(10) NOT NULL AUTO_INCREMENT
但请记住，STOCK_CODE也不是null，你必须在插入之前填充它。
答案 1 :(得分：0)
您可以在创建实体实例的位置发布代码并保存吗？错误是自我解释的。您必须设置STOCK_ID的值。你想让它成为一个标识列（mysql中的auto_increment）吗？如果是这种情况，请更改数据模型以将STOCK_ID声明为标识，并为stockId添加@GeneratedValue（strategy = GenerationType.IDENTITY）。