hierarchical

问题 Let's say I have a structure like this: Is it possible to create an enum that will return the string value of selected cell? For example: enum.GROUP_MAIN1.SUBGROUP1.COL1 will return value "COL1" . I was looking for nested enums but didn't find the solution to this situation. 回答1: You can do this with such trick: public interface GROUPMAIN1 { enum SUBGROUP1 implements GROUPMAIN1 { COL1, COL2, COL3 } enum SUBGROUP2 implements GROUPMAIN1 { COL3, COL4 } } So to get enum you will need to use

问题 Let's say I have a structure like this: Is it possible to create an enum that will return the string value of selected cell? For example: enum.GROUP_MAIN1.SUBGROUP1.COL1 will return value "COL1" . I was looking for nested enums but didn't find the solution to this situation. 回答1: You can do this with such trick: public interface GROUPMAIN1 { enum SUBGROUP1 implements GROUPMAIN1 { COL1, COL2, COL3 } enum SUBGROUP2 implements GROUPMAIN1 { COL3, COL4 } } So to get enum you will need to use

问题 Let's say I have a structure like this: Is it possible to create an enum that will return the string value of selected cell? For example: enum.GROUP_MAIN1.SUBGROUP1.COL1 will return value "COL1" . I was looking for nested enums but didn't find the solution to this situation. 回答1: You can do this with such trick: public interface GROUPMAIN1 { enum SUBGROUP1 implements GROUPMAIN1 { COL1, COL2, COL3 } enum SUBGROUP2 implements GROUPMAIN1 { COL3, COL4 } } So to get enum you will need to use

来源： https://stackoverflow.com/questions/63264851/display-sub-subcategories-terms-list-on-woocommerce-subcategory-archive-pages

问题 I have this pandas dataframe with column "Code" that contains the sequential hierarchical code. My goal is to create new columns with each hierarchical level code and its name as followed: Original data: Code Name 0 A USA 1 AM Massachusetts 2 AMB Boston 3 AMS Springfield 4 D Germany 5 DB Brandenburg 6 DBB Berlin 7 DBD Dresden My Goal: Code Name Level1 Level1Name Level2 Level2Name Level3 Level3Name 0 A USA A USA AM Massachusetts AMB Boston 1 AM Massachusetts A USA AM Massachusetts AMB Boston 2

问题 Consider a pandas dataframe with hierarchical columns and rows generated as follows: import pandas as pd import numpy as np row1 = ['a', 'b'] row2 = ['c', 'd', 'e'] row3 = ['w', 'x', 'y', 'z'] row_tuple_list = [] for r1 in row1: for r2 in row2: for r3 in row3: row_tuple_list.append((r1, r2, r3)) row_index = pd.MultiIndex.from_tuples(row_tuple_list, names=['row1', 'row2', 'row3']) col1 = ['f'] col2 = ['g', 'h'] col_tuple_list = [] for c1 in col1: for c2 in col2: col_tuple_list.append((c1, c2))

问题 If a blog has a 'categories' table such as the following: CREATE TABLE categories ( id INTEGER PRIMARY KEY AUTO_INCREMENT, parent_id INTEGER NOT NULL, name VARCHAR(30) NOT NULL, description TEXT, count INTEGER NOT NULL DEFAULT 0 ); And if the parent_id field is intended to refer to the 'id' field of the categories table, then how could I add a constraint that would ensure that values inserted into parent_id references the id field? I simply want to make sure that only category id values that

问题 Any hope to make this Taxonomy dropdown to work with hierarchical. I added 'hierarchical' => 1 but it seems doesn't work for me! <?php if( $terms = get_terms([ 'taxonomy' => 'category', 'hierarchical' => 1, 'hide_empty' => false, 'child_of' => 233 ]) ) : echo '<select name="categoryfilter4"><option>Downloads...</option>'; foreach ( $terms as $term ) : echo '<option value="' . $term->term_id . '">' . $term->name . '</option>'; // ID of the category as the value of an option endforeach; echo '<

问题 +--------+---------+-----------+ | id | title | parent_id | +--------+---------+-----------+ | 1 | Lvl-1 | null | +--------+---------+-----------+ | 2 | Lvl-2 | null | +--------+---------+-----------+ | 3 | Lvl-11 | 1 | +--------+---------+-----------+ | 4 | Lvl-12 | 1 | +--------+---------+-----------+ | 5 | Lvl-121 | 4 | +--------+---------+-----------+ How do i actualy get root parent for each row For example, row with id 5 have parent with id 4 and id 4 have parent with id 1 , so root id

问题 I have to design an interface for hierarchical entity: interface HierarchicalEntity<T extends HierarchicalEntity<T>> { T getParent(); Stream<T> getAncestors(); } It's quite easy to implement default getAncestors() method in terms of getParent() in such a way that the former would return Stream of all the ancestors. Implementation example: default Stream<T> getAncestors() { Stream.Builder<T> parentsBuilder = Stream.builder(); T parent = getParent(); while (parent != null) { parentsBuilder.add