我是新来的休眠,我想在xml映射的示例。我在运行应用程序时遇到以上错误,请帮助。这里是我写com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:无法添加或更新子行
这里是映射类
quotation.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="main.com.paramatrix.models.Quotation" table="quotation">
<id name="quotationId" type="long">
<column name="QUOTATION_ID" />
<generator class="identity" />
</id>
<property column="NO_OF_ITEMS" name="noOfItems" type="long" />
<property column="QUOTATION_GEN_DATE" name="quotationGenDate"
type="string" />
<one-to-one name="invoice" class="main.com.paramatrix.models.Invoice"
cascade="save-update"></one-to-one>
<set name="itemList" table="item" inverse="true" lazy="true"
fetch="select">
<key>
<column name="QUOTATION_ID" not-null="true" />
</key>
<one-to-many class="main.com.paramatrix.models.Item" />
</set>
<many-to-one name="user" class="main.com.paramatrix.models.User"
fetch="select">
<column name="USER_ID" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>
user.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="main.com.paramatrix.models.User" table="user">
<id name="userId" type="long">
<column name="USER_ID" />
<generator class="identity" />
</id>
<property column="USER_NAME" name="userName" type="string" />
<set name="quotationList" table="quotation" inverse="true" lazy="true"
fetch="select">
<key>
<column name="USER_ID" not-null="true" />
</key>
<one-to-many class="main.com.paramatrix.models.Quotation" />
</set>
</class>
</hibernate-mapping>
这里是POJO类我的代码已用于制图
User.java
public class User implements Serializable{
private long userId ;
private String userName;
private Set<Quotation> quotationList = new HashSet<Quotation>();
public long getUserId() {
return userId;
}
public void setUserId(long userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Set<Quotation> getQuotationList() {
return quotationList;
}
public void setQuotationList(Set<Quotation> quotationList) {
this.quotationList = quotationList;
}
}
Quotation.java
public class Quotation implements Serializable{
private long quotationId;
private long noOfItems;
private String quotationGenDate;
private Set<Item> itemList = new HashSet<Item>();
private Invoice invoice;
private User user;
public long getQuotationId() {
return quotationId;
}
public void setQuotationId(long quotationId) {
this.quotationId = quotationId;
}
public long getNoOfItems() {
return noOfItems;
}
public void setNoOfItems(long noOfItems) {
this.noOfItems = noOfItems;
}
public String getQuotationGenDate() {
return quotationGenDate;
}
public void setQuotationGenDate(String quotationGenDate) {
this.quotationGenDate = quotationGenDate;
}
public Set<Item> getItemList() {
return itemList;
}
public void setItemList(Set<Item> itemList) {
this.itemList = itemList;
}
public Invoice getInvoice() {
return invoice;
}
public void setInvoice(Invoice invoice) {
this.invoice = invoice;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
App.js
public class App {
public static void main(String args[]) {
User user = new User();
user.setUserName("Pradip");
Quotation quotation = new Quotation();
Item item1 = new Item();
item1.setItemName("laptop");
Item item2 = new Item();
item2.setItemName("mobile");
// Set<Item> itemList = new HashSet<>();
// itemList.add(item1);
// itemList.add(item2);
// quotation.setNoOfItems(itemList.size());
quotation.setUser(user);
quotation.getItemList().add(item1);
quotation.getItemList().add(item2);
quotation.setNoOfItems(quotation.getItemList().size());
Invoice invoice = new Invoice();
invoice.setInvoiceGenDate("13-10-2017");
invoice.setTotalBill(50000);
quotation.setInvoice(invoice);
invoice.setQuotation(quotation);
// Set<Quotation> quotationos = new HashSet<Quotation>();
// quotationos.add(quotation);
user.getQuotationList().add(quotation);
DataProvider.addData(main.com.paramatrix.models.User.class, user);
DataProvider.addData(main.com.paramatrix.models.Quotation.class, quotation);
DataProvider.addData(main.com.paramatrix.models.Invoice.class, invoice);
}
在此先感谢!
这里是错误消息
不能添加或更新子行,外键约束失败 (
hibernate_assign
quotation
,约束FKA771958CD5030893
外键(USER_ID
)参考文献user
(USER_ID
))在 异常线程“main”org.hibernate.exception.ConstraintViolationException: 无法插入:[main.com.paramatrix.models.Quotation] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96) 在 org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 在 org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:63) 在 org.hibernate.persister.entity .AbstractEntityPersister.insert(AbstractEntityPersister.java:2346) 在 org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2853) 在 org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71 ) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(Abs tractSaveEventListener.java:320) 在 org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) 在 org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) 在 org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) 在 org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) 在 org.hibernate.event.def .DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) 在 org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) 在org.hibernate.impl.SessionImpl。 fireSave(SessionImpl.java:713) org.hibernate.impl.SessionImpl.save(SessionImpl。java:701)at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)at main.com.paramatrix.util.DataProvider.addData(DataProvider.java:10) at main.com.paramatrix。 util.App.main(App.java:49)引起的: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: 不能添加或更新子行,外键约束失败 (hibernate_assign
quotation
,约束FKA771958CD5030893
。 外键(USER_ID
)参考文献user
(USER_ID
))在 sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法) 在sun.reflect.NativeConstructorAccessorImpl.newInstance(未知 来源)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.Util.getInstance(Util.java:408)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java :3973)处 com.mysql.jdbc.MysqlIO.sqlQueryDirect在 com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527 com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)) (MysqlIO.java:2680)at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2501)at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) 在 com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079) 在 com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement的的.java:2013) 在 com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) 在 com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) 在 org.hibernate作为。 id.IdentityGenerator $ GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:93) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractRetu rningDelegate.java:56)
你可以添加堆栈跟踪吗? –
刚刚编辑问题 –
错误表示您不尊重外键约束,因此您可能在添加或更新引用之前尝试添加或更新用户!产生这个错误的代码在哪里? –