What's the difference beetwen EntityManager and DAO? Is it same thing?
What's the difference beetwen EntityManager and DAO?
1.9k Views Asked by Dmitry Oleinik At
1
There are 1 best solutions below
Related Questions in JAVA
- Add image to JCheckBoxMenuItem
- How to access invisible Unordered List element with Selenium WebDriver using Java
- Inheritance in Java, apparent type vs actual type
- Java catch the ball Game
- Access objects variable & method by name
- GridBagLayout is displaying JTextField and JTextArea as short, vertical lines
- Perform a task each interval
- Compound classes stored in an array are not accessible in selenium java
- How to avoid concurrent access to a resource?
- Why does processing goes slower on implementing try catch block in java?
- Redirect inside java interceptor
- Push toolbar content below statusbar
- Animation in Java on top of JPanel
- JPA - How to query with a LIKE operator in combination with an AttributeConverter
- Java Assign a Value to an array cell
Related Questions in JAKARTA-EE
- Which Should i use for date,time,email in servlet?
- Simple JavaEE HTML GET/POST application
- Updating the message contents for a MessageDialog wicket
- Access roles from multiple applications
- How to compile an individual jsp file from command line
- DB2, Hibernate, JPA: Schema does not exist
- Spring load a file
- Execute RequestDispatcher after 5 seconds
- Hibernate Lazy loading not work in OneToOne relation
- Websphere 8.5.5 - shared session context not working
- withSchedule(ScheduleBuilder<SBT>) in the type TriggerBuilder<Trigger> is not applicable for arguments (MutableTrigger)
- Setting response header using interceptor?
- How to use the same ContainerRequestFilter for multiple projects?
- [Ljava.lang.Object; cannot be cast to List from a request SQL
- which should i use in request.getParameter in servlet?
Related Questions in DAO
- Hibernate : session.get(...) vs session.getNamedQuery(...)
- How do I write unit test (JUnit) to check Database connection using DAO class?
- What's the difference beetwen EntityManager and DAO?
- spring jdbcdaosupport returns null
- Syntax for DAO 'Like' Select Query
- Junit tests in Java (Spring, MVC) for DAO and Service
- Casting a list of objects to another one
- sqlcommand not properly ended
- Spring Boot and Dao
- Android - GreenDao create/use entity and Dao class for existing sqlite database. Use greenDao with existing db
- Converting ADODB Loop into DAO
- Java DAO implementation setObjects
- I can´t scroll my jtable although i have a scrollpane
- How to build a query using Hibernate Criteria and Projections
- Can I check Value in DAO Recordset field during update process?
Related Questions in ENTITYMANAGER
- Spring context unable to resolve among multiple entity managers
- Error while accessing EntityManager in spring boot
- Refresh collection / empty cache - using entity manager
- What's the difference beetwen EntityManager and DAO?
- BreezeJs features already implemented by AngularJs?
- Why is my EntityManager not properly injected?
- Hibernate Entity Manager
- spring 4 struts 1.x mixing xml and java config
- JPA DAO Update row without full row context
- Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named TEST
- SQL Error: 1795, SQLState: 42000 - maximum number of expressions in a list is 1000
- Return partial Entity from EntityManager
- Table cannot be resolved jpa
- Shouldn't EntityManager#merge work with non identifiable entity?
- Difference between cascade remove and explicit remove
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
EntityManager is an interface provided by JPA, which provides generic methods used to persist, merge, find and create queries for entities.
DAO is a pattern used to isolate database-access code in a separate component (the DAO) so that services concentrate on the business logic rather than low-level database stuff. It helps in unit-testing the service, and in separating responsibilities.
When using JPA, you typically write one DAO per entity, that will contain all the JPA code (queries, mostly) related to that entity. And this DAO uses the EntityManager.