java - How to represent a legacy database using Hibernate? -


i have follow legacy database structure , content:

order parameter        value -------------------------------- 1     user_login       user 1     user_password    123456 1     user_level       basic 2     user_login       admin 2     user_password    s3k42k 2     user_level       advanced

i represent below , utilize entity called 'user' can abstract complexity of legacy structure:

id    user  password  level ------------------------------- 1     user  123456    basic 2     admin s3k42k    advanced

i got using view in database, couldnt update using view. there way represent legacy structure using hibernate can update too?

your best approach normalize table. make things easier in long run. 1 thing try not option, create table called user holds @ least primary key , id of users information in parameter table. allow treat relationship one-to-many , map hibernate. example following:

note might have mapping wrong did off of top of head illustrate point.

@entity class parameter{      @column(name="order")     private int order;      @column(name="parameter")     private string parameter;      @column(name="value")     private string value;  }   @entity class user{      @column(name="id")     private int id;      @onetomany(cascade=all)     @jointable(name="secondary",          joincolumns={@joincolumn(name="id")},         inversejoincolumns=@joincolumn(name="order"))     @mapkeyjoincolumn(name="parameter")     private map<string,parameter> userdata;      public string getusername(){         return userdata.get("user_login")     }      etc.  }

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