jpa many to many child list not persisted -


i have senario there entity article, entity author , join table article_author. article , author have many many relationship ( on article can have many authors , author can have many articles). here entities classes : author class:

@entity @table(name="author") @namedquery(name="author.findall", query="select author a") public class author implements serializable {     private static final long serialversionuid = 1l;      @id     @column(name="author_code")     private string authorcode;      private string nom;      //bi-directional many-to-many association article     @manytomany(fetch=fetchtype.eager)     @jointable(         name="article_author"         , joincolumns={             @joincolumn(name="author")             }         , inversejoincolumns={             @joincolumn(name="art_ref")             }         )     private list<article> article;  }  //getters , setters + hashcode , equals methods

article class :

@entity @table(name="article_test") @namedquery(name="articletest.findall", query="select articletest a") public class articletest implements serializable {     private static final long serialversionuid = 1l;      @id     @column(name="art_ref")     private string artref;      @column(name="art_titre")     private string arttitre;      //bi-directional many-to-many association autheurtest     @manytomany(mappedby="articletests", fetch=fetchtype.eager)     private list<autheurtest> autheurtests;   //getters , setters + hashcode , equals methods }

and here code create article , attach 1 author (for testing) : 

            //.....             autheurtest aut1 = new autheurtest();             autheurtest aut2 = new autheurtest();              aut1.setautheurcode("1");             aut1.setnom("aut1");             articlemodelbean.createautheurtest(aut1);             articletest art1 = new articletest();                        art1.setartref("a");             art1.setarttitre("art1");                    articlemodelbean.dmlarticle_test(art1,"insert"); //persist art1             autheurtest newaut = articlemodelbean.getauteuractive_test(aut1.getautheurcode());                        articletest  foundedart =  articlemodelbean.findarticle_test(art1.getartref()); //getting article                   foundedart.getautheurtests().add(newaut);                  articlemodelbean.artaut(foundedart); //merge foudedart         //.....

so i'm not getting error, both article , author added database! foreign keys not inserted join table. author not attached article.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more