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我使用hibernate在hsql數據庫中插入類餐的對象它工作正常，如果我只插入1個對象，但只要我嘗試插入第二個它給我一個錯誤。這裏是我的代碼和錯誤：通過休眠插入2對象後Hsql錯誤
public static void main(String[] args) {
Main obj = new Main();
Long mealId1 = obj.saveMeal("Pommes");
Long mealId2 = obj.saveMeal("Doener1");
}
public Long saveMeal(String mealName)
{
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
Long mealId = null;
try {
transaction = session.beginTransaction();
Meal meal = new Meal(mealName);
mealId = (Long) session.save(meal);
transaction.commit();
} catch (HibernateException e) {
transaction.rollback();
e.printStackTrace();
} finally {
session.close();
}
return mealId;
}
package data;
import java.util.List;
import java.util.LinkedList;
public class Meal implements java.io.Serializable {
private long id;
private String name;
private List<Image> images;
private List<Review> reviews;
private Grouping grouping;
public Meal() {
}
public Meal(String mealName) {
name = mealName;
}
public Meal(long mealId, String mealName) {
id = mealId;
name = mealName;
}
public long getId() {
return id;
}
public void setId(long mealId) {
id = mealId;
}
public String getMealName() {
return name;
}
public void setMealName(String mealName) {
name = mealName;
}
public float getAvg() {
float avg = 0;
for (int i = 0; i < reviews.size(); i++)
{
avg = avg + reviews.get(i).getReviewPoints();
}
return avg;
}
public List<Image> getNumberImages(int number) {
assert (number >= 0);
return images.subList(0, number) ;
}
public List<Image> getImages() {
return images;
}
public void setImages(LinkedList<Image> images) {
this.images = images;
}
public List<Review> getReviews(int number) {
assert (number >= 0);
return reviews.subList(0, number) ;
}
public LinkedList<String> getAltNames() {
LinkedList<String> altNames = new LinkedList<String>();
LinkedList<Meal> altNameMeals = grouping.getMeals();
for (int i = 0; i < altNameMeals.size(); i++)
{
altNames.add(altNameMeals.get(i).getMealName());
}
return altNames;
}
public void addReview(Review review) {
if (!reviews.contains(review)) {
reviews.add(review);
}
}
public Grouping getGrouping() {
return grouping;
}
public void setGrouping(Grouping grouping) {
this.grouping = grouping;
}
public void addImage(Image image) {
if (!images.contains(image)) {
images.add(image);
}
}<hibernate-mapping>
<class name="data.Meal" table="MEAL">
<id name="id" type="long" access="field">
<column name="ID" />
<generator class="assigned" />
</id>
<property name="name" type="java.lang.String" access="field">
<column name="NAME" />
</property>
<list name="images" inverse="false" table="IMAGE" lazy="true" access="field">
<key>
<column name="ID" />
</key>
<list-index column="column_name" />
<one-to-many class="data.Image" />
</list>
<list name="reviews" inverse="false" table="REVIEW" lazy="true" access="field">
<key>
<column name="ID" />
</key>
<list-index></list-index>
<one-to-many class="data.Review" />
</list>
<many-to-one name="grouping" class="data.Grouping" fetch="join">
<column name="GROUPING" />
</many-to-one>
</class>
首先是主要方法2日被persitet類和第三該類的Hibernate映射。這是錯誤消息：
843 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: -104, SQLState: 23505
843 [main] ERROR org.hibernate.util.JDBCExceptionReporter - integrity constraint violation: unique constraint or index violation; SYS_PK_10585 table: MEAL
843 [main] ERROR org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session