detach

Ravi Kapoor

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Oct 1, 2015, 5:02:34 AM10/1/15

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Newbie question,

I am having trouble making detach work properly.

1. I load an object. I call detachAll(element, true), the fields are NOT copied and everything is still null

2. I call detachAll(element, false), now all fields are copied, however it is a proxied instance and I cannot use it as POJO in application.

Screenshots

1.png: before I call detach, you can see in debug window that all fields are null

2.png: after I call detachAll(element, true), the fields are still null

3.png After I call detachAll(element, false), the fields are populated, but now it is proxied (so if I hadd a

What is right way to do this?

1.png

2.png

3.png

alessand...@gmail.com

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Oct 1, 2015, 6:57:00 AM10/1/15

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Hi,

can you post the complete query at the line 19 and the complete stacktrace from console ?

Alessandro

Ravi Kapoor

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Oct 1, 2015, 10:24:57 AM10/1/15

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Sure, I made some changes, now it is 2 file source only. These two screenshots show all source code. I am also attaching two source code files for reference.

5.png

4.png

App.java

Element.java

alessand...@gmail.com

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Oct 1, 2015, 10:49:35 AM10/1/15

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Sorry,

if you can, you send me also the db and the class component.

Alessandro

Ravi Kapoor

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Oct 1, 2015, 11:13:06 AM10/1/15

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I am not sure how to send DB. I simplified code so it will create the table for you. Source code is attached.

App.java

Element.java

alessand...@gmail.com

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Oct 1, 2015, 11:23:19 AM10/1/15

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Thanks,

I'll let you know as soon as possible

Kind regards,

Alessandro

alessand...@gmail.com

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Oct 1, 2015, 11:42:08 AM10/1/15

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Hi,

try the code in the attachments.

Alessandro

App.java

Element.java

alessand...@gmail.com

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Oct 1, 2015, 11:53:51 AM10/1/15

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Hi,

try the code in the class App and let me know.

Alessandro

App.java

Ravi Kapoor

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Oct 1, 2015, 2:45:24 PM10/1/15

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Hi Alessandro,

You used

    	dbTx.detachAll(root, false);

This has always worked. When I switch it to

    	dbTx.detachAll(root, true);

it again stops worknig. This is the problem I am reporting.

I need "non proxy" version, so I can use it as business object in my application.

xvik

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Oct 2, 2015, 3:26:34 AM10/2/15

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When you need to use pure pojo instead of proxy you have to introduce new reference:

Element rootPojo = dbTx.detachAll(root, true);

пятница, 2 октября 2015 г., 0:45:24 UTC+6 пользователь Ravi Kapoor написал:

Ravi Kapoor

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Oct 2, 2015, 12:57:14 PM10/2/15

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Thanks xvik that worked perfectly. Such a simple solution.
Thanks Alessandro for helping.

Can I present one more problem?

I created 'Person' class so it can have more Person as children.

I create structure of "Parent" -> "Child" -> "Grand child" and save it. (This works very well)

I read the "Parent" back from DB, it retrieves child and grand child with it. (This also works)

I add one more grand child to this structure.

Now when I save it, the 2nd grandchild is not saved.

I experimented and found that any changes in existing Persons are saved. Also, any new child objects are also saved, however any new grandchild objects are not saved.

Also note that if I add a child as well (code is commented out), then both new objects (1 child and 1 grandchild) are saved.

This feels very strange. Is this expected behavior?

Source files are attached.

App1.java

Person.java

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