我想动态构建一个gremlin_python查询，该查询在单个事务中添加顶点并删除顶点。
例如：假设我的图形的顶点具有属性desc ='toBeDeleted'。我想建立一个查询来添加desc = My adapter.java
public class MyAdapter extends ArrayAdapter<String> {
ArrayList<String> name=new ArrayList<>();
ArrayList<String> status=new ArrayList<>();
ArrayList<String> imgs=new ArrayList<>();
ArrayList<String> key=new ArrayList<>();
private Context context;
private int resource;
private LayoutInflater layoutInflater;
public MyAdapter(@NonNull Context context, int resource, ArrayList<String> name, ArrayList<String> status, ArrayList<String> imgs,ArrayList<String> key) {
super(context, resource);
this.imgs=imgs;
this.name=name;
this.status=status;
this.key=key;
this.resource=resource;
this.context=context;
layoutInflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return name.size();
}
@NonNull
@Override
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
// return super.getView(position, convertView, parent);
View v=layoutInflater.inflate(resource,parent,false);
CircleImageView view=v.findViewById(R.id.single_user_image);
if(imgs!=null) {
Picasso.get().load(imgs.get(position)).placeholder(R.drawable.user).into(view);
}else{
Picasso.get().load(R.drawable.user).into(view);
Toasty.error(context,"check internet connection", Toast.LENGTH_SHORT).show();
}
TextView tv1=v.findViewById(R.id.single_user_name);
TextView tv2=v.findViewById(R.id.single_user_status);
tv1.setText(name.get(position));
tv2.setText("Connected Since:"+status.get(position));
v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(getContext(),SingleUserProfileActivity.class);
intent.putExtra("key",key.get(position));
getContext().startActivity(intent);
}
});
return v;
}
}
Myactivity.java
public class ConnectedUsersFragment extends Fragment {
ListView connectedUsersList;
DatabaseReference connectedUsersReference;
DatabaseReference userInfoRefernce;
DatabaseReference presenceReference;
ArrayList<String> name=new ArrayList<>();
ArrayList<String> status=new ArrayList<>();
ArrayList<String> imgs=new ArrayList<>();
ArrayList<String> key=new ArrayList<>();
MyAdapter adapter;
FirebaseUser user;
public ConnectedUsersFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.fragment_connected_users, container, false);
connectedUsersList=v.findViewById(R.id.connected_users_list);
user=FirebaseAuth.getInstance().getCurrentUser();
presenceReference=FirebaseDatabase.getInstance().getReference().child("users").child(user.getUid());
connectedUsersReference= FirebaseDatabase.getInstance().getReference().child("connected_users").child(user.getUid());
userInfoRefernce=FirebaseDatabase.getInstance().getReference().child("users");
adapter=new MyAdapter(getContext(),R.layout.single_user_layout,name,status,imgs,key);
connectedUsersList.setAdapter(adapter);
connectedUsersReference.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
String userKey=dataSnapshot.getKey();
final String userConnectedDate=dataSnapshot.child("date").getValue(String.class);
userInfoRefernce.child(userKey).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String userKey=dataSnapshot.getKey();
String username=dataSnapshot.child("name").getValue(String.class);
String userstatus=dataSnapshot.child("profile_status").getValue(String.class);
String userimg=dataSnapshot.child("thumb_image").getValue(String.class);
name.add(username);
status.add(userConnectedDate);
imgs.add(userimg);
key.add(userKey);
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toasty.error(getContext(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toasty.warning(getContext(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
return v;
}
@Override
public void onStart() {
super.onStart();
if(user!=null) {
presenceReference.child("online").setValue("true");
}
}
@Override
public void onResume() {
super.onResume();
if(user!=null) {
presenceReference.child("online").setValue("true");
}
}
@Override
public void onStop() {
super.onStop();
if(user!=null) {
presenceReference.child("online").setValue(ServerValue.TIMESTAMP);
}
}
@Override
public void onPause() {
super.onPause();
if(user!=null) {
presenceReference.child("online").setValue(ServerValue.TIMESTAMP);
}
}
}
，desc_1，desc_2的顶点，并删除desc = desc_3的顶点吗？
toBeDeleted注意：我已经尝试过了，但是它两次创建了desc_1，desc_2，desc_3。
我也在寻找一种删除边以及部分交易的方法