实体package bikurim.silverfix.com.bikurim;
import android.app.SearchManager;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import java.util.ArrayList;
import bikurim.silverfix.com.bikurim.adapters.MenuDrawerAdapter;
import bikurim.silverfix.com.bikurim.adapters.RecyclerViewAdapter;
import bikurim.silverfix.com.bikurim.items.FamilyItem;
public class MainActivity extends AppCompatActivity {
private ArrayList<FamilyItem> families = new ArrayList<FamilyItem>();
private ArrayList<bikurim.silverfix.com.bikurim.items.MenuItem> items = new ArrayList<bikurim.silverfix.com.bikurim.items.MenuItem>();
private DrawerLayout drawerLayout;
private ActionBarDrawerToggle drawerToggle;
private RecyclerView recyclerView, menuView;
private RecyclerViewAdapter adapter;
private MenuDrawerAdapter navAdapter;
private SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_families);
// Setting up the tool bar
final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// Setting up the main lists and their adapters
fillList();
createMenuItems();
recyclerView = (RecyclerView) findViewById(R.id.rv);
menuView = (RecyclerView) findViewById(R.id.right_drawer);
adapter = new RecyclerViewAdapter(families);
navAdapter = new MenuDrawerAdapter(items);
// Default Animator
DefaultItemAnimator animator = new DefaultItemAnimator();
recyclerView.setItemAnimator(animator);
menuView.setItemAnimator(animator);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
menuView.setLayoutManager(new LinearLayoutManager(this));
menuView.setAdapter(navAdapter);
Log.d("Menu Items Count:", ""+navAdapter.getItemCount());
// Setting up the navigation drawer side-menu with DrawerLayout
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.drawer_open, R.string.drawer_close) {
/** Called when a drawer is in closed state. */
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
getSupportActionBar().setTitle(R.string.app_name);
}
/** Called when a drawer is in open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getSupportActionBar().setTitle(R.string.drawer_name);
}
};
drawerLayout.addDrawerListener(drawerToggle);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Does absolutly nothing, yet!", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
}
private void fillList() {
families.add(new FamilyItem("Ohayon", "12:36"));
families.add(new FamilyItem("Zohar", "14:23"));
families.add(new FamilyItem("Lasry", "15:55"));
families.add(new FamilyItem("Zambuzak", "17:45"));
families.add(new FamilyItem("Cohen", "11:33"));
families.add(new FamilyItem("Tapera", "09:25"));
families.add(new FamilyItem("Ochuya", "09:25"));
families.add(new FamilyItem("Konichiwua", "09:25"));
families.add(new FamilyItem("Kontaktiwa", "09:25"));
}
private void createMenuItems() {
items.add(new bikurim.silverfix.com.bikurim.items.MenuItem(R.drawable.about, "עזרה"));
items.add(new bikurim.silverfix.com.bikurim.items.MenuItem(R.drawable.settings, "הגדרות"));
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
drawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
drawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_families, menu);
SearchManager searchManager =
(SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(
searchManager.getSearchableInfo(getComponentName()));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
adapter.getFilter().filter(query);
return true; // handled
}
@Override
public boolean onQueryTextChange(String newText) {
adapter.getFilter().filter(newText);
return true;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (drawerToggle.onOptionsItemSelected(item)) {
return true;
}
//noinspection SimplifiableIfStatement
if (id == R.id.action_search) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
的集合属性Project与实体contributors的{{1}}关系映射
@OneToMany然后我需要先检查User是否已@Entity
@Table( name = "projects" )
public class Project {
...
@OneToMany
@JoinTable(name = "project_contributors")
private List<User> contributors = new ArrayList<User>();
...
}
contributors user，然后再添加id。我正在尝试使用HQL查询，但我显然非常感兴趣。
我在尝试什么：
contributorId但它给出了错误
Query query = session.createQuery(
"select p.contributors from Project p where p.id = :pId and p.contributors.id = :cId"
);
query.setParameter("pId", projectId);
query.setParameter("cId", contributorId);
@SuppressWarnings("unchecked")
List<User> res = (List<User>) query.list();
有没有一个好的撒玛利亚人想给我一点推力？
我做的另一次尝试是
illegal attempt to dereference collection [project0_.id.contributors] with element property reference [id]
但没有。
答案 0 :(得分：15)
contributors是一个集合。因此，它没有名为id的属性。
Id是此Collection的元素的属性。
您可以通过加入集合而不是取消引用它来解决问题：
SELECT p
FROM Project pj
JOIN pj.contributors p
WHERE pj.id = :pId
AND p.Id = :cId
答案 1 :(得分：2)
有助于读取您的HQL，就好像是Java代码试图取消引用Java类中的字段一样：
p.contributors.id
您正在尝试访问id p.contributors List<User>。列表没有ID。这样就行不通了。
select p.contributors
这样的查询，如果正确的话，将返回一个贡献者列表的列表。这不是你想要的。
你会在SQL中做到这一点？加入。与JPQL相同：
select c from Project p
join p.contributors c
where p.id = :pId and c.id = :cId
进行连接并为其分配别名允许查询关联的目标实体。