I have a requirement to fulfill, we have a "supercategories" field in the advanced search filters of the "Product" entity. The categories are divided into 4 stages, the first stage is the root category and has the second stage categories as subcategories, the latter have the third stage categories as subcategories and the latter still have zero subcategories but have products. What I need to do is this: EG:
If a first-stage category is specified in that field:
SAP retrieves all child (second-stage) categories of the first-stage category
level specified.
For each second level category, SAP retrieves all child categories (third level) of the second level category.
For each third-level category, it retrieves the products belonging to that category.
All this only if "supercategories" filter is present in the search filters otherwise the search should not change.
How can I override the advanced search and take that supercategories filter value and do my logic with it? Thanks a lot.
Related
A product can have distinctive sorts of attributes, and they can change with regard to items, such as a car can have taking after qualities: {cost, colour, price} and chair can have : {cost, width, profundity, stature}. Product attributes are organized in a progressive bunch structure, where a product attribute group can contain one or a few product attributes and/or attributes. Group can contain one or a more Product Attributes and/or Product Attribute Groups.
Write the code required to handle the over portrayed items and a print work that prints the information in such a way that it is evident which properties have a place to which item and which quality gather in case any.
I'm still learning Hibernate (jpa annotation) with Spring, but is there a way I would be able to take a single table and output hierarchical structure? Eg, I have a table called 'books' with the columns: book_id, author, library, floor, section. Is there a way I could return it with library -> floor -> section -> all the books in that section.
I have a class called books that essentially provides the everything required for creating the table. I also created a controller that lets me retrieve all the books, and it outputs it onto the webpage in a JSON format. Is there a way I could do this so it'll be hierarchical.
My first thought would be to make classes called library, floor, and section. Library would hold the name of the library and a list of floors in that library, floor would hold hold the name of the floot and a list of sections in that floor, and section would hold the name of the section and a list of all the books in that section. It became very long and involved, and I couldn't even get it to work, so I was hoping there was a much simpler way of doing it.
Yes there is, you can map ORM hierarchy in one of 3 ways, single table, one per concrete class and one per relationship.
For single table you have to use a discriminator column in the table that differentiates data and tells what row is for which object.
Refer:
http://www.thejavageek.com/2014/05/14/jpa-single-table-inheritance-example/
I am creating a pojo class in spring mvc. I am trying to have a product class which will have n number of products and each of which can follow under different categories.
As the categories of these products will remain the same. Let say it will have only 5 different categories by default.
Now I have to relate the each product to related categories.
Question:
I the above case how can I relate the product to different categories?
Which relationship will be suitable in hibernate.(One to many or many to one)?
How this relationship can be designed?
As per your requirement I can think of 2 particular cases below:
If a category can have n number of products but a product can belong to only one particular category then relationship from Category to Product will be 1 to Many.
If a category can have n number of products and also a product can belong to n number of categories then relationship between category to product will be many to many in which case you also need to have a third table which will be a JOIN table.
I want to use input type "filtered_select" and "filter" in a way that on selecting value from one select box two more select box should filter values.
If I have some data in organization table and two more tables employees and projects. I want to select One organization. Depending upon my selection other two drop downs should fetch all employees and projects of that organization.
You need to achieve this by using AJAX calls. On click, you need to fire the query to database and populate data in respective drop down employees and projects. You would need to use serveResource() method.
I am authoring a javabean and would like to know if it should include properties to set values obtained from a sql join?
Say I have database tables for Products and Orders. These are also my java bean names.
Now I want to display a list of all products but in addition to all the product properties, I want to have columns to display last purchase date and last purchased by
My db query to get the product list would need to do joins to gather the additional info. It does not seem correct to have setters and getters for `last purchase date and last purchased by' in Product.java model. I may want to have a 3rd column so constantly adding new columns to my bean doesn't make sense.
How do you go about this? I seem to encounter this when needing to display lists of models in my view.
Have a Map in Product. Upon firing the sql, store hte results of the join as key value pair in the Map. K=lastpurchasedby(columnName) and V= the value
So no need to add individual attributes. They all come in key-value pairs.