pojo

问题 In our project we have a constraint of not having the luxury to alter the table structure already in place. The tables are highly denormalized in nature. We have come up with good POJOs for the application. We have the Entity beans generated out of the exiting tables. Now we have to map the POJOs to the entities so that we can persist. Ultimately, we combine a good POJO with a bad table. Any thoughts on options/alternatives/suggestions to this approach? 回答1: Hibernate/JPA(2) has a rich set of

问题 I can send callback param(s) and it works perfectly as long as I am only sending some primitive types like String. But the same thing does not work for even the simplest POJO. PrimeFaces guide says that the RequestContext.addCallbackParam() method can handle POJOs and it coverts them into JSON. I don't know why it's not working in my case. Has anybody done that? 回答1: Solution found! --------------------------------------------------------------------- I did some research and found the answer

问题 I'm using spring 3.1.2 and I need to parse a json object into POJO. This is the json that I need to parse: { "Person" : { "id" : "2" }, "Dog" : { "dateOfBirth" : "2012-08-20 00:00:00", "price" : "10.00" } } I need to convert this json object (which is combined from two objects) into one POJO, here it is: public class MyClass{ public MyClass(){} public MyClass(String personsId, TimeStamp dogsDateOfBirth, BigDecimal dogsPrice){ .... // assign each parameter to the appropriate field } private

问题 Some of my domain classes are getting rather rich: They implement an interesting comparable, might have plus, minus, multiply and div, many have some convenient getters which call services and determine complicated things. And most of all, they have the right properties. I am using these both for the normal "database transactions" and also in times when I just want an object that has all those methods but may not want to save it. My teammates are convinced that this is very bad, and advise

问题 In the company that I work for we have this major discussion on whether it should be better to use wrapping classes for primitives (java.lang.Integer, java.lang.Long) or whether to use the primitive types directly in the POJOs that map Entities to Tables in Hibernate. The idea is that we want these values to not be null in the database. The arguments in favor of using primitives: Handling these values as int means that they can never be null, in this way making it impossible to inadvertently

问题 Hi I am sending a JSON Post request using the FireFox RestClient. My JSON Request is as below: { "firstName": "Test", "lastName": "1", "isActive": 1 } My POJO has isActive field as below private boolean isActive; My Controller is define as below @RequestMapping(method = {RequestMethod.POST, RequestMethod.PUT}, value = "/save") public ResponseEntity<RestResponse> save( @RequestBody POJOUserDetails userDetails, WebRequest request){ In my POJO, when I check the value of isActive, it is false no

问题 Where should object serialization logic (the mapping of fields into XML or JSON names and values) be placed? Inside each entity object OR into a different set of classes only concerned with serialization? Any other best practices out there that relate to this question? For example: class Person { String name; } Some people go about it this way: class Person { String name; public String toJson () { // build JSON, use 'name' field } } But if we also needed toXML(), toCSV(), toXYZ() keeping that

问题 I have a Detectable class with a Revisions set, which are Hibernate managed POJOs. I'm also mapping my entities using hbm.xml files. When user goes to Detectable management screen, I want him to see Detectable data into a table, which will also contain the last Revision done. However the complete set of revisions will only be available accessing the detail page of the detectable. My chance is to show the last revision date which will be loaded separately as an attribute with each Detectable

问题 I have written few codes for inserting data into my SQL database. Actually, I am trying to learn Struts2 with Hibernate. But, unfortunately I am facing a problem after submitting my form. I could not find the reason for this error message. My try & catch block throws error like: Exception in saveOrUpdate() Rollback :org.hibernate.MappingException: Unknown entity: v.esoft.pojos.Employee Pojo( Employee.java ): @Entity @Table(name = "employee", catalog = "eventusdb") public class Employee

问题 In my Android Studio project there are two android modules "mobile" and "wear", these seem to be the views and controllers for the types of android devices that will be able to run this application I expect them to share some logic, such as the model files and POJOs so where should that be stored? I expect the "mobile" module to do a lot more heavy lifting than the "wear" module, but should I put the model objects in that module, or should I make a new third module that they can both use? (or