我遇到了Hibernate映射的问题。我正在使用oracle数据库。请查看代码，请帮我解决此问题。
模型类：
package com.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name="emp")
public class Employee {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="eno")
int empid;
@Column(name="name")
String name;
@ManyToOne()
@JoinColumn(name="deptid",nullable=false)
Department dept;
public int getEmpid() {
return empid;
}
public void setEmpid(int empid) {
this.empid = empid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Department getDept() {
return dept;
}
public void setDept(Department dept) {
this.dept = dept;
}
}
package com.model;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="dept")
public class Department {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="deptid")
int deptid;
@Column(name="deptname")
String deptname;
@OneToMany(mappedBy="dept")
Set<Employee> empset;
public int getDeptid() {
return deptid;
}
public void setDeptid(int deptid) {
this.deptid = deptid;
}
public String getDeptname() {
return deptname;
}
public void setDeptname(String deptname) {
this.deptname = deptname;
}
public Set<Employee> getEmpset() {
return empset;
}
public void setEmpset(Set<Employee> empset) {
this.empset = empset;
}
}
配置文件：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
<property name="connection.username">user_name</property>
<property name="connection.password">password</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">validate</property>
<mapping class="com.model.Employee"/>
<mapping class="com.model.Department"/>
</session-factory>
</hibernate-configuration>
测试类：
package com.demo;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.model.Department;
import com.model.Employee;
public class HibernateTest {
public static void main(String[] args) {
Configuration cfg = new Configuration();
cfg.configure();
SessionFactory sf = cfg.buildSessionFactory();
Session sess = sf.openSession();
Transaction tx = sess.beginTransaction();
Department dept1 = new Department();
dept1.setDeptname("aaa");
sess.save(dept1);
Employee emp1 = new Employee();
emp1.setName("aaa");
emp1.setDept(dept1);
sess.save(emp1);
tx.commit();
sess.close();
}
}
db表结构： create table emp（eno number（4）primary key，name varchar2（10），deptid number（5）forign key references dept（deptid））;
create table emp（deptid number（5）primary key，deptname varchar2（10））;
我得到的错误是：
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:129)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:190)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:61)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:490)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:195)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:179)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:214)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:715)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:707)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:702)
at com.demo.HibernateTest.main(HibernateTest.java:23)
Caused by: java.sql.SQLException: ORA-01400: cannot insert NULL into ("VASAVI"."DEPT"."DEPTID")
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:955)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1169)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3368)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)
... 21 more
答案 0 :(得分：0)
我已经使用hibernate.properties测试了MySQL数据库上的持久化类。一切都很完美（没有任何错误）。所以，我认为，您需要使用
重新创建数据库模式class TestSMS
{
public static string strIp = "10.00.105.00";
public static int Port = 1009;
//-----------------connect------------------//
public static Socket Connect(string host, int port)
{
Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp);
Console.WriteLine("Establishing Connection to {0}",
host);
socket.Connect(host, port);
clsError.LogError("TestSMS:Connect()", "Connection established");
return socket;
}
//---------------End connect----------------//
//-------------------send--------------------//
public static int SendReceiveTest(Socket server,string Message)
{
byte[] connectionString = Encoding.UTF8.GetBytes("CON^`!XML^`!ABCD#END#");
byte[] msg = Encoding.UTF8.GetBytes(Message);
byte[] bytes = new byte[1024];
string response = string.Empty;
int byteCount = 0;
int i = 0;
try
{
// Blocks until send returns.
i = server.Send(connectionString, connectionString.Length, SocketFlags.None);
clsError.LogError("TestSMS:SendReceiveTest()", "Connection string sent");
// Get reply from the server.
byteCount = server.Receive(bytes, server.Available,
SocketFlags.None);
if (byteCount > 0)
{
response = Encoding.UTF8.GetString(bytes);
if (response.IndexOf("CON!0") != 0)
{
i = server.Send(msg, msg.Length, SocketFlags.None);
clsError.LogError("TestSMS:SendReceiveTest()", "Message data sent");
byteCount = server.Receive(bytes, server.Available,
SocketFlags.None);
response = Encoding.UTF8.GetString(bytes);
if ((response.ToString().IndexOf("ACK!1") == 0) || (response.ToString().IndexOf("ACK!MSGSTATUS=TRUE") == 0))
{
clsError.LogError("TestSMS:SendReceiveTest()", "Message sent successfully: " + response);
}
//log
}
else
{
clsError.LogError("TestSMS:SendReceiveTest()", "Could not handshake with SMS Server");
}
}
else
{
clsError.LogError("TestSMS:SendReceiveTest()", "No Acknowledgement recieved");
}
}
catch (SocketException e)
{
clsError.LogError("TestSMS:SendReceiveTest()", e.Message.ToString());
return (e.ErrorCode);
}
return 0;
}
//-----------------End send------------------//
static void Main(string[] args)
{
try
{
string strXmlFormat = " MSG^`!<DEPT>IPL</DEPT><APPID>TLC</APPID><MOBILE>918879440021</MOBILE><DEPTMSGID>14092111115JH21075</DEPTMSGID><MESSAGE>This is a test message</MESSAGE><FROMDATETIME></FROMDATETIME><TODATETIME></TODATETIME><NODELIVERYTIMEFROM>2200</NODELIVERYTIMEFROM><NODELIVERYTIMETO>0700</NODELIVERYTIMETO><HTTPMODE>S</HTTPMODE><REMARKS></REMARKS><REMARKS1></REMARKS1><REMARKS2></REMARKS2><TRN_GENERATE_TIMESTAMP>2015-12-10 16:48:54 </TRN_GENERATE_TIMESTAMP>#END#";
clsError.LogError("Inside Main:Msg in XML format", strXmlFormat);
Socket Socket;
Socket = TestSMS.Connect(TestSMS.strIp, TestSMS.Port);
TestSMS.SendReceiveTest(Socket, strXmlFormat);
}
catch (Exception ex)
{
clsError.LogError("Inside Main:Main()", ex.Message.ToString());
throw ex;
}
}
}
答案 1 :(得分：0)
如果要在具有唯一索引或约束的列中插入值，并且此列的插入值已存在于另一行中，则始终显示此错误。重新创建数据库模式。 更改配置文件
<property name="hibernate.hbm2ddl.auto">validate</property>
到
<property name="hibernate.hbm2ddl.auto">create</property>