An Giang info: Youtube daily report Jan 4 2018

Iman Bonam Kufor P-3 By Dr Anayet Ullah Abbasi Jonpori, Bahas

For more infomation >> Iman Bonam Kufor P-3 By Dr Anayet Ullah Abbasi Jonpori, Bahas - Duration: 14:11.

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Hibernate Tip : How to detach an entity from the persistence context - Duration: 5:40.

Hi,

I'm Thorben Janssen from thoughts-on-java.org with a new Hibernate Tip.

This time I will show you how to detach entities from your persistence context.

As I explained in one of my previous video

and in my Hibernate Performance Tuning training:

When you need to update or delete a huge number of entities,

it is often better to use a JPQL

or SQL statement

instead of updating one entity after the other.

Instead of performing at least one query for each updated entity

you then just need to execute 1 query.

But the JPQL or SQL statement also has a disadvantage.

Hibernate doesn't know which database records you're updating

and can't replicate the changes

to the entities stored in the persistence context

or 1st level cache.

You, therefore, need to do that yourself and detach all entities

from the persistence context

before you execute the query.

That's when I always get the same question:

How do you detach an entity from the persistence context?

You can do that in two steps:

First, Make sure that Hibernate persisted all pending changes in the database

And second, remove the entities from the persistence context

Step 1 is crucial because Hibernate delays the execution of all write operations

as long as possible.

Your persistence context

might contain new entities which were not inserted into the database

or dirty entities that require the execution of an SQL update statement.

When you detach these entities from the persistence context,

Hibernate will not perform the required SQL statements,

and you will lose these pending changes.

You can prevent that by calling the flush method

on the EntityManager.

After you've done that,

you can remove a specific entity from the persistence context

by calling the detach method

or you can call the clear method to clear the persistence context completely.

I prepared a simple example.

I first load the Book entity with id 1 from the database

and write it to the log file.

Then I change the title attribute.

The entity is now dirty,

and Hibernate will generate an SQL UPDATE statement for it

when it flushes the persistence context.

In the next step,

I trigger the flush

by calling the flush method on the EntityManager.

Hibernate now performs a dirty check on all managed entities

and executes the required SQL statements

to write all pending changes to the database.

Now I can call the clear method

to detach all entities

without losing any pending changes.

After this is done,

I can execute a JPQL UPDATE query

and change the price of all entities.

When I now call the EntityManager find method,

Hibernate has to execute an SQL query

because the Book entity is no longer managed by the persistence context.

The Database returns the updated record,

and this log statement

will write the entity

with the updated title

and price to the log file.

Here you can see the log messages.

Hibernate performs an SQL SELECT statement

to get the Book entity with id 1

before I write it to the log file.

This update statement was triggered by the

change of the title attribute

and the call of the flush method.

The changed title is now stored in the database.

Hibernate then performs the JPQL UPDATE statement

to update the price and another SQL SELECT statement

to retrieve the Book entity with id 1.

As you can see here,

the title and the price are now updated.

OK, that's it for today.

If you want to learn more about Hibernate,

you should join the free Thoughts on Java Library.

It gives you free access to a lot of member-only content

like an ebook about the Java 8 support in Hibernate,

a printable PDF version of this Hibernate Tip,

lots of cheat sheets and a video course.

I'll add the link to it to the video description below.

See you next week for a new Hibernate Tip

and if you like today's video,

please give it thumbs up and subscribe below.

Bye

For more infomation >> Hibernate Tip : How to detach an entity from the persistence context - Duration: 5:40.

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047 過去に未練タイムマシンを作るデロリアンデアゴスティーニ BTTF Eaglemoss イーグルモスステアリングホイール - Duration: 8:20.

For more infomation >> 047 過去に未練タイムマシンを作るデロリアンデアゴスティーニ BTTF Eaglemoss イーグルモスステアリングホイール - Duration: 8:20.

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Puffy Mattress on Ellen Show

For more infomation >> Puffy Mattress on Ellen Show

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Comment apprendre à s'aimer et à s'accepter ( Partie 1) | DÉVELOPPEMENT PERSONNEL - Duration: 6:15.

For more infomation >> Comment apprendre à s'aimer et à s'accepter ( Partie 1) | DÉVELOPPEMENT PERSONNEL - Duration: 6:15.

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Comment avoir de l'assurance sans être grossier ( Partie 3 ) | DÉVELOPPEMENT PERSONNEL - Duration: 5:11.

For more infomation >> Comment avoir de l'assurance sans être grossier ( Partie 3 ) | DÉVELOPPEMENT PERSONNEL - Duration: 5:11.

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Comment avoir de l'assurance sans être grossier ( Partie 2 ) | DÉVELOPPEMENT PERSONNEL - Duration: 6:48.

For more infomation >> Comment avoir de l'assurance sans être grossier ( Partie 2 ) | DÉVELOPPEMENT PERSONNEL - Duration: 6:48.

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Comment bien rire ( Partie 2) | DÉVELOPPEMENT PERSONNEL - Duration: 3:35.

For more infomation >> Comment bien rire ( Partie 2) | DÉVELOPPEMENT PERSONNEL - Duration: 3:35.

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Comment bien rire ( Partie ) | DÉVELOPPEMENT PERSONNEL - Duration: 6:29.

For more infomation >> Comment bien rire ( Partie ) | DÉVELOPPEMENT PERSONNEL - Duration: 6:29.

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Official Trailer | My Birthday Song | Releasing 19th Jan 2018 - Duration: 1:58.

(Crowd Singing) Happy Birthday to you

(Crowd Singing) Happy birthday dear Rajiv!

Happy Birthday Rajiv

Are you bringing someone along to the party tonight?

Is her name... Sandy?

Hey...

Sandy have we met before?

What do you think?

Happy Birthday!

Be careful

You never know when you run out of luck

What you see is an illusion

And what you don't is real!

My husband's having an affair

But hey! Thank God!

It was only one night!

You're surrounded by darkness

Rajiv!

You're going to regret that Rajiv!

There is no end to this night!

A lot of strange things are happening since morning

I saw you die!

(Song) The ground beneath your feet is slipping away

How long can you hide the stain on your heart?

For more infomation >> Official Trailer | My Birthday Song | Releasing 19th Jan 2018 - Duration: 1:58.

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Pour finir sa vie Johnny Hallyday aurait pu choisir une autre île que Saint-Barth - Duration: 3:19.

For more infomation >> Pour finir sa vie Johnny Hallyday aurait pu choisir une autre île que Saint-Barth - Duration: 3:19.

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INDIA SIGNED DEFENCE DEALS WORTH RS 2 40 LAKH CR IN LAST 4 YEARS - Duration: 1:45.

For more infomation >> INDIA SIGNED DEFENCE DEALS WORTH RS 2 40 LAKH CR IN LAST 4 YEARS - Duration: 1:45.

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PEUGEOT 5008: DE EENVOLUMER IS VOORBIJGESTREEFD! - Duration: 9:19.

For more infomation >> PEUGEOT 5008: DE EENVOLUMER IS VOORBIJGESTREEFD! - Duration: 9:19.

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Candlestick made of natural materials with own hands | Alina Romanovna - Duration: 4:04.

hello everyone the name is Alina good

to my channel

in this video we will stylish

candlestick made of branches birch

we need glass beaker

bark

thin and thick birch branches

sackcloth

jute twine

cut out a small a piece of burlap for

in order to close bottom of glass

further we glue burlap with

hot glue

ready

determine the length of branches for decorating and

cut the necessary quantity

similar come with thin

branches

then prepare bark beetroot

small strips

proceed to the decor glass, first

glue birch bark

further on the birch bark all branches

twine tighten twigs and tie a bow

such a candlestick perfectly suited

both for large and for small candles

be sure try to make

themselves but if you

liked this video then put it

husky write comments and

subscribe to my channel click on

bell to the first to learn about

new videos on my channel to new

meetings for the time being

For more infomation >> Candlestick made of natural materials with own hands | Alina Romanovna - Duration: 4:04.

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Barbo Inject Q - Álomállomás (impro-2018) / instru: Akalé Wubé - Duration: 2:58.

For more infomation >> Barbo Inject Q - Álomállomás (impro-2018) / instru: Akalé Wubé - Duration: 2:58.

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6 Choses banales qui en réalité sont mauvaises pour la santé - Duration: 3:26.

For more infomation >> 6 Choses banales qui en réalité sont mauvaises pour la santé - Duration: 3:26.

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ail santé : remède tibétain à base d'ail pour purifier votre organisme ! - Duration: 8:16.

For more infomation >> ail santé : remède tibétain à base d'ail pour purifier votre organisme ! - Duration: 8:16.

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Feed The Forge: Air Freshen...

For more infomation >> Feed The Forge: Air Freshen...

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MrFr33zy™ - 🏆🐔StarWars Battlefront Holiday Fun, Road to 200 SubsYo Yo Yo🐔🏆 - Duration: 7:43:01.

For more infomation >> MrFr33zy™ - 🏆🐔StarWars Battlefront Holiday Fun, Road to 200 SubsYo Yo Yo🐔🏆 - Duration: 7:43:01.

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Ness Vs Yippii | Reverse Race | CryptoTruck | Show For Babies | Video For Children by Kids Channel - Duration: 15:24.

REVERSE RACING

Ness Vs Yippii

For more infomation >> Ness Vs Yippii | Reverse Race | CryptoTruck | Show For Babies | Video For Children by Kids Channel - Duration: 15:24.

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If You Are Happy | Bob The Train | Kindergarten Nursery Rhyme For Children | Video For Toddlers - Duration: 1:12:00.