我需要一个帮助.
org.hibernate.exception.sqlGrammarException: UnkNown column 'this_1_.houses_id' in 'field list'
我想他必须写this_1_id而不是this_1_.houses_id
可能我做错了实体和关系？
2实体 – 房屋和街道
ER型号：
表街
> Id
>名称
> Houses_id
桌子
> id
>名称
我的课程：
街
@Entity
@Table(name="Streets")
public class Street {
private Long id;
private String name;
private Long houses_id;
private House house;
public Street(){}
@Id
@GeneratedValue(generator="increment")
@GenericGenerator(name="increment",strategy="increment")
@Column(name="id")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToOne
@JoinTable(name="Houses",joinColumns = @JoinColumn(name="id"),inverseJoinColumns=@JoinColumn(name="houses_id"))
public House getHouse() {
return house;
}
public void setHouse(House house) {
this.house = house;
}
@Column(name="houses_id")
public Long getHouses_id() {
return houses_id;
}
public void setHouses_id(Long houses_id) {
this.houses_id = houses_id;
}
}
屋
@Entity
@Table(name="Houses")
public class House {
private Long id;
private String name;
public House(){}
@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name="increment",strategy="increment")
@Column(name="id")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
我的DAOIMP：
StreetDAOImp：
public class StreetDAOImpl implements StreetDAO {
@Override
public void addStreet(Street street) throws sqlException {
// Todo Auto-generated method stub
Session session = null;
try {
session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.save(street);
session.getTransaction().commit();
} catch (Exception e) {
// Todo: handle exception
e.printstacktrace();
}
finally{
if(session != null && session.isopen()){
session.close();
}
}
}
@Override
public Collection getAllStreets() throws sqlException {
// Todo Auto-generated method stub
Session session = null;
List<Street> streets = new ArrayList<Street>();
try {
session = HibernateUtil.getSessionFactory().openSession();
streets = session.createCriteria(Street.class).list();
//Query q = session.createquery("select str from com.ff.model.Street str join str.houses h where h.id = str.houses_id");
} catch (Exception e) {
// Todo: handle exception
e.printstacktrace();
}
return streets;
}
}
HouseDAOImpl：
public class HouseDAOImpl implements HouseDAO {
@Override
public void addHouse(House house)throws sqlException {
// Todo Auto-generated method stub
Session session = null;
try {
session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.save(house);
session.getTransaction().commit();
} catch (Exception e) {
// Todo: handle exception
e.printstacktrace();
}
finally{
if(session != null && session.isopen()){
session.close();
}
}
}
@Override
public Collection getAllHouses() throws sqlException {
// Todo Auto-generated method stub
Session session = null;
List<House> houses = new ArrayList<House>();
try {
session = HibernateUtil.getSessionFactory().openSession();
houses = session.createCriteria(House.class).list();
} catch (Exception e) {
// Todo: handle exception
e.printstacktrace();
}
finally {
if (session != null && session.isopen()) {
session.close();
}
}
return houses;
}}
错误：
log4j:WARN No appenders Could be found for logger (org.jboss.logging). log4j:WARN Please initialize the log4j system properly. Hibernate: select this_.id as id1_1_,this_.houses_id as houses2_1_1_,this_.name as name1_1_,this_1_.houses_id as houses3_0_1_,house2_.id as id0_0_,house2_.name as name0_0_ from Streets this_ left outer join Houses this_1_ on this_.id=this_1_.id left outer join Houses house2_ on this_1_.houses_id=house2_.id org.hibernate.exception.sqlGrammarException: UnkNown column 'this_1_.houses_id' in 'field list' at org.hibernate.exception.internal.sqlExceptionTypeDelegate.convert(sqlExceptionTypeDelegate.java:82) at org.hibernate.exception.internal.StandardsqlExceptionConverter.convert(StandardsqlExceptionConverter.java:49) at org.hibernate.engine.jdbc.spi.sqlExceptionHelper.convert(sqlExceptionHelper.java:125) at org.hibernate.engine.jdbc.spi.sqlExceptionHelper.convert(sqlExceptionHelper.java:110) at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129) at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81) at $Proxy14.executeQuery(UnkNown Source) at org.hibernate.loader.Loader.getResultSet(Loader.java:2031) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1832) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1811) at org.hibernate.loader.Loader.doQuery(Loader.java:899) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341) at org.hibernate.loader.Loader.doList(Loader.java:2516) at org.hibernate.loader.Loader.doList(Loader.java:2502) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2332) at org.hibernate.loader.Loader.list(Loader.java:2327) at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124) at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1621) at org.hibernate.internal.Criteriaimpl.list(Criteriaimpl.java:374) at com.ff.DAO.StreetDAOImpl.getAllStreets(StreetDAOImpl.java:48) at FFMain.main(FFMain.java:58) Caused by: com.MysqL.jdbc.exceptions.jdbc4.MysqLSyntaxErrorException: UnkNown column 'this_1_.houses_id' in 'field list' at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at com.MysqL.jdbc.Util.handleNewInstance(Util.java:406) at com.MysqL.jdbc.Util.getInstance(Util.java:381) at com.MysqL.jdbc.sqlError.createsqlException(sqlError.java:1030) at com.MysqL.jdbc.sqlError.createsqlException(sqlError.java:956) at com.MysqL.jdbc.MysqLIO.checkerrorPacket(MysqLIO.java:3491) at com.MysqL.jdbc.MysqLIO.checkerrorPacket(MysqLIO.java:3423) at com.MysqL.jdbc.MysqLIO.sendCommand(MysqLIO.java:1936) at com.MysqL.jdbc.MysqLIO.sqlQueryDirect(MysqLIO.java:2060) at com.MysqL.jdbc.ConnectionImpl.execsql(ConnectionImpl.java:2542) at com.MysqL.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734) at com.MysqL.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1885) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122) ... 16 more
解决方法
看看这段代码：
@JoinTable(name="Houses",inverseJoinColumns=@JoinColumn(name="houses_id"))
我不知道你在这里想要实现什么,但是JoinTable通常用于解决与中介表的ManyToMany关系.所以这个代码意味着你有一个具有id和homes_id列的房屋.错误消息说在Houses表中没有house_id(这对我来说听起来是合乎逻辑的)也许你应该尝试ManyToOne和JoinColumn？例如：
@JoinColumn(name="house_id")
或houses_id,如果这是你的外键在街道表.如果这真的是一对一的关系,多个声音很奇怪.
原文地址：https://www.jb51.cc/java/123903.html
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