本机SQL抛出无效的列名异常

Question

我正在为我的应用程序使用Hibernate 3.2.5。

我有一张Dept桌子和一张Employees桌子。

部门java

private int deptId;
private String deptName;
private Map empMap = new HashMap();
//Getters and Setters

员工.java

private int empId;
private String empName;
private int deptId;
private int age;
private String sex;
private Dept dept;

HBM映射文件

<class name="com.jdbc.Dept" table="dept">
  <id name="deptId" type="integer" column="DEPT_ID">
      <generator class="assigned"></generator>
  </id>  
  <property name="deptName">
      <column name="DEPT_NAME"></column>
  </property>    
  <map name="empMap" inverse="false" cascade="all" lazy="true">
      <key column="DEPT_ID"></key>
      <map-key formula="EMP_ID" type="integer"></map-key>
      <one-to-many class="com.jdbc.Employees"/>
  </map>

以下是本机SQL的代码：

SQLQuery query = session.createSQLQuery("Select d.DEPT_ID, e.EMP_NAME from Dept d,Emp e where d.DEPT_ID = e.DEPT_ID")
                .addEntity(Dept.class);
List<Dept> departments = query.list();
        for(Dept depart :departments)
            System.out.println(depart.getDeptName());

我得到了例外：

org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:2223)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
at com.jdbc.HibernateStartup.main(HibernateStartup.java:75)
Caused by: java.sql.SQLException: Invalid column name
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207)
at oracle.jdbc.driver.OracleStatement.getColumnIndex(OracleStatement.java:3295)
at oracle.jdbc.driver.OracleResultSetImpl.findColumn(OracleResultSetImpl.java:1913)
at oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:1514)
at org.hibernate.type.StringType.get(StringType.java:18)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154)
at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2096)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1380)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1308)
at org.hibernate.loader.Loader.getRow(Loader.java:1206)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:580)
at org.hibernate.loader.Loader.doQuery(Loader.java:701)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
... 7 more

当我直接在数据库中运行查询时，我会得到正确的输出，但是在hibernate状态下，它给出的是Invalid COlumn name。我已经确认列名仅是正确的。

请让我知道如何解决此问题。

Answer 1

您的映射中包含以下内容：

<column name="DEPT_NAME"></column>

但是您的sql Select和之间没有这样的列from：

session.createSQLQuery("Select d.DEPT_ID, e.EMP_NAME from Dept d,Emp e where d.DEPT_ID = e.DEPT_ID")

Hibernate无法绑定该属性。试试这个：

session.createSQLQuery("Select d.DEPT_ID, d.DEPT_NAME, e.EMP_NAME from Dept d,Emp e where d.DEPT_ID = e.DEPT_ID")