我有这种情况。
这是我的Village.java
:
public class Village{
private Integer vid;
private String villageName;
private String district;
public Integer getVid() {
return vid;
}
public void setVid(Integer vid) {
this.vid = vid;
}
public String getVillageName() {
return villageName;
}
public void setVillageName(String villageName) {
this.villageName = villageName;
}
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
}
这是我的Dao.java
界面:
public interface Dao<T> {
public void insert();
public void update();
public void delete();
}
这是我的方面Village_Dao.aj
(你可以忽略静态方法逻辑):
import org.apache.ibatis.session.SqlSession;
import com.madx.finance.data.utils.persistence.Dao;
import com.madx.finance.data.utils.factory.ConnectionFactory;
public aspect Village_Dao {
declare parents: Village implements Dao<Village>;
public void Village.insert() {
Village.insertVillage(this);
}
public void Village.update() {
Village.updateVillage(this);
}
public void Village.delete() {
Village.deleteVillage(this.getVid());
}
public Village Village.getData() {
return Village.getDataVillage(this.getVid());
}
public static void Village.insertVillage(Village village) {
SqlSession session = ConnectionFactory.getSqlSessionFactory().openSession();
VillageMapper mapper = session.getMapper(VillageMapper.class);
mapper.insertVillage(village);
session.commit();
session.close();
}
public static void Village.updateVillage(Village village) {
SqlSession session = ConnectionFactory.getSqlSessionFactory().openSession();
VillageMapper mapper = session.getMapper(VillageMapper.class);
mapper.updateVillage(village);
session.commit();
session.close();
}
public static void Village.deleteVillage(Integer id) {
SqlSession session = ConnectionFactory.getSqlSessionFactory().openSession();
VillageMapper mapper = session.getMapper(VillageMapper.class);
mapper.deleteVillage(id);
session.commit();
session.close();
}
public static Village Village.getDataVillage(Integer id) {
SqlSession session = ConnectionFactory.getSqlSessionFactory().openSession();
VillageMapper mapper = session.getMapper(VillageMapper.class);
Village village = mapper.selectVillage(id);
session.close();
return village;
}
}
我尝试将Village_Dao.aj
转换为带注释的版本Village_Dao_Java.java
但没有成功。
我只是设法让类实现Dao,但我无法编写方法(在此文件中单独插入,更新e删除Village_Dao_Java.java
)。
这是Village_Dao_Java.java
的版本(仍未完整)(我读过这个link但我无法在这种情况下使用它):
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.DeclareParents;
import com.madx.finance.data.utils.persistence.Dao;
@Aspect
public class Village_Dao_Java {
@DeclareParents("com.madx.demo.Village")
private Dao<Village> implementedInterface;
}
答案 0 :(得分:2)
使用@AspectJ样式无法实现所需的功能,您需要使用更强大的本机语法。 (你为什么还要转换?)
这背后的原因是Java编译器只能将@DeclareParents
转换为Village
是您在方面中定义的任何接口实现的子类的形式,例如:< / p>
@Aspect
public class Village_Dao_Java {
public static class VillageDao implements Dao<Village> {
@Override
public void insert() {
Village.insertVillage(this);
}
@Override
public void update() {
Village.updateVillage(this);
}
@Override
public void delete() {
Village.deleteVillage(this.getVid());
}
public Village getData() {
return getDataVillage(this.getVid());
}
}
@DeclareParents(
value = "de.scrum_master.app.Village",
defaultImpl = VillageDao.class
)
private Dao<Village> villageDao;
}
但这种方法有几个问题:
VillageDao
子类Village
访问静态方法,因此您无法在VillageDao
中声明静态方法,但必须直接在Village
中声明它们VillageDao
中声明它们,你可以打电话给他们,例如通过VillageDao.insertVillage(this)
,但签名public static void insertVillage(Village village)
将不再适合,因为this
是VillageDao
,而不是自己的子类Village
。this.getVid()
,因为this
是VillageDao
而不是Village
,但getter方法在原始{{1}中有固定签名}。class。等等。 Java编译器的功能不足以完成AspectJ编译器的功能:将代码编织到原始类文件中。
Ergo:请坚持使用原生语法。它不仅更强大,而且IMO也更具可读性。我永远不明白为什么这么多人试图将强大的AspectJ哄骗到糟糕的替代@AspectJ语法中。不知何故,他们似乎相信他们从纯Java语法中获益。我不同意。他们只是降低了技术手段和糟糕的语法,从未打算用于成熟的AOP。