我需要帮助 .
当我使用 getAllStreets() 方法时，我在HQL中有错误：
org.hibernate.exception.SQLGrammarException: Unknown column 'this_1_.houses_id' in 'field list'
我猜他必须写 this_1_id 而不是 this_1_.houses_id
可能是我做错了实体和关系？
2实体 - 房屋和街道
ER - 型号：
表街道
-
同上
-
姓名
-
Houses_id
表房子
-
id
-
名字
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
4 回答
看看这段代码：
我不确定你想在这里实现什么，但JoinTable通常用于解决与中间表的ManyToMany关系 . 所以这段代码意味着你有
Houses表id和houses_id列 . 错误消息说Houses表中没有houses_id（这听起来对我合乎逻辑）也许你应该尝试ManyToOne和JoinColumn？例如：
或
houses_id如果那是你在街道表中的外键 . 如果这是多对一的关系，那么多个听起来很奇怪 .请确保您呼叫的表格具有正确的列 . 我遇到了问题，我发现映射的域列在数据库中不匹配 .
只需检查POJO中的变量名称和数据库中提供的名称 . 当它们不相同时，会抛出此错误 .
请检查您的数据库是否包含所有表 . 如果表中缺少任何表或属性，请将它们添加到数据库并重新添加hibernate映射文件 . 我以这种方式修复了这个错误 . 我在我的数据库的两个表中丢失了2个属性，一旦我添加它们并重新添加hibernate，错误就修复了 .