Ormlite - 扩展BaseDaoImpl时构造函数调用失败

Question

我有以下表格 -

@DatabaseTable(tableName="b", daoClass=B_DaoImpl.class)
public class B {

   @DatabaseField
   public String b1 ;

   public B(){
     // For Ormlite
   }
}

@DatabaseTable(tableName="a", daoClass=A_DaoImpl.class)
public class A {

   @DatabaseField
   public String a1 ;

   @DatabaseField(foreign=true)
   public B b;

   public A(){
     // For Ormlite
   }
}

对于这些表,相关的Dao和DaoImpl如下

public interface A_Dao extends Dao<A, String>{}
public interface B_Dao extends Dao<B, String>{}


public class B_DaoImpl extends BaseDaoImpl<User, String> implements B_Dao {

   public B_DaoImpl(ConnectionSource connectionSource) throws SQLException {
      super(connectionSource, B.class);
   }
}

public class A_DaoImpl extends BaseDaoImpl<User, String> implements A_Dao {

   public A_DaoImpl(ConnectionSource connectionSource) throws SQLException {
      super(connectionSource, A.class);
   }
}

数据库助手如下:

 public class DatabaseHelperImpl extends OrmLiteSqliteOpenHelper implements DatabaseHelper {

   private A_DaoImpl aDao = null;
   private B_DaoImpl bDao = null;

   public B_DaoImpl getBDao() throws SQLException {
       if (bDao == null) {
          bDao = getDao(B.class);
       }
       return bDao;
   }

   public A_DaoImpl getA() throws SQLException {
        if (aDao  == null ) {
          aDao = getDao(A.class);
        }
        return aDao;
   }
}

现在,当我试着打电话时 -

ADao aDao = databaseHelper.getA();

它出错并出现以下错误:

 Could not call the constructor in class class A_DaoImpl

现在,如果我没有A中的foriegn键 - 即如果A不包含公共B b,它可以正常工作.这里有什么我想念的吗？

非常感谢你提前.

Answer 1

我怀疑在异常堆栈跟踪结束时缺少原因消息.例如,如果我复制上面的示例,我得到:

java.sql.SQLException: Could not call the constructor in class class 
      com.j256.ormlite.table.CustomDaoTest$A_DaoImpl
  at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22)
  ...
Caused by: java.lang.reflect.InvocationTargetException
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  ...
Caused by: java.lang.IllegalArgumentException: Foreign field class
>>>>      com.j256.ormlite.table.CustomDaoTest$B does not have id field  <<<<<<
  at com.j256.ormlite.field.FieldType.configDaoInformation(FieldType.java:332)
  ...

因为A有一个外来的类B,所以B需要有一个id字段.外部字段需要标识字段.

我敢肯定,A并B为你的类的简单版本,因此,如果您发布更多的例外,包括所有原因的信息,我会适当地修改我的答案.