java - Hibernate Composite Key Join -


i'm trying use spring data perform joined queries 1 of tables has composite key , i'm not sure how map entities.

here analogy of data model:

table: device pk=model_id pk=serial_id ...  table: device_settings pk=device_settings_id fk=model_id fk=serial_id ...

here analogy of code, doesn't compile due "mappedby" attribute isn't present.

@entity @table(name = "device_settings") public class devicesettings {      @id     @generatedvalue(strategy = generationtype.auto)     @column(name = "device_settings_id")     private long id;      // pretty sure problem     @onetomany(targetentity = device.class, mappedby = "devicekey", cascade = {cascadetype.merge}, fetch = fetchtype.eager)     @joincolumns({         @joincolumn(name = "model_id", referencedcolumnname = "model_id"),         @joincolumn(name = "serial_id", referencedcolumnname = "serial_id")})     private list<device> devices; }  @entity @table(name = "device") public class device {     @id         private devicekey devicekey;     }     ... }   @embeddable public class devicekey implements serializable {     private static final long serialversionuid = -1943684511893963184l;      @column(name = "model_id")     private long modelid;      @column(name = "serial_id")     private short serialid; }

associations marked mappedby must not define database mappings @jointable or @joincolumn

to achieve scenario have define @manytoone: 

@manytoone(cascade = {cascadetype.merge}, fetch = fetchtype.eager)     @joincolumns({         @joincolumn(name = "model_id", referencedcolumnname = "model_id"),         @joincolumn(name = "serial_id", referencedcolumnname = "serial_id")})      private device device;

this end model_id, serial_id, device_settings_id

or

define @joincolumn in device entity entities:

devicesettings : 

    @entity     @table(name = "device_settings")     public class devicesettings {          @id         @generatedvalue(strategy = generationtype.auto)         @column(name = "device_settings_id")         private long id;           @onetomany( mappedby = "devicesettings", cascade = {cascadetype.merge}, fetch = fetchtype.eager)          private list<device> devices; }

device entity : 

@entity @table(name = "device") public class device {          @embeddedid         private devicekey devicekey;          @manytoone         @joincolumn(name="device_settings_id")         private devicesettings devicesettings;        //getters , setters }

note : can decide owner of relationship , put mappings accorindly either 1 device has many device settings or other way around.


Comments

Post a Comment

Popular posts from this blog

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

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

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more