How can I use a wrapper object as a JPA entity without having a corresponding table in the database -

-

I am creating a system over an existing (old and dirty) database. For this, I am creating a JPA layer above the database, but I do not want to map my domain objects directly into the existing database tables.

Do I currently have a wrapper object which is a way of databases in 4 entities (data 4 tables from which) can I use this wrapper class as a parameter in JPQ query?

It would be nice if the wrapper class itself works like some JPA unit, but without the related database table, for example, let me call it wrapper 

 < How should the public class cover be changed? Personal firstpenetiti first; Private secondjpnty second; }   
 so that I  
  list & lt; wrapper & gt; Wrapper = ...; TypedQuery & LT; Cover & gt; Query = entityManager.createQuery ("Select Wrap" // Probably this is the problem where the problem is: JPA requires a type of `wrap`, but this type of entity is required, which is called` Wrap 'is not' WHERE wrap in: wrapper "+" and wrap.first.property = 1 "+" and wrap.second.property = 2 ", wrapper class); Query.setParameter ("wrapper", wrapper);   
 
 I was looking at making wrappers in an @ embedded, hoping how JPQL could detect it, but alas   < p> 
 
 Perhaps you can use in your wrapper class through animation / mapping?  
 In this way, your cover can be composed of four built-in tables but the cleaner interface in an app.

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more