Hibernate Test 1 - Check Your Understanding

In Hibernate, what is Query Level Cache?

The query-level cache is the Session based cache

The query-level cache is a query resultset cache that works in tandem with the second-level cache.

Both of the above

None of the above

Correct! Wrong!

Explanation:
Hibernate includes a query resultset cache that works in tandem with the second-level cache.

Is the SessionFactory object thread-safe?

Yes

Correct! Wrong!

Explanation:
Yes, SessionFactory is thread-safe, and numerous threads can access it at the same time.

What is the meaning of lazy loading?

Lazy loading is a technique in which objects are persisted on demand basis

Lazy loading is a technique in which objects are loaded on demand basis

Both of the above

None of the above

Correct! Wrong!

Explanation:
The term "lazy loading" refers to a strategy in which objects are loaded only when they are needed.

In the hibernate configuration, which of the following statements concerning the hibernate.dialect property is true?

This property makes HIbernate generate the appropriate Java code for the course chosen database

This property makes Hibernate generate the appropriate java code for the course chosen database

Both of the above

None of the above

Correct! Wrong!

Explanation:
Hibernate generates the necessary SQL for the selected database when this property is set.

Which of the following statements concerning Hibernate's Query object is correct?

A Query instance is used to bind query parameters, limit the number of results returned by a query, and then execute the query.

To retrieve data from the database and construct objects, use the Hibernate Query Language (HQL) string.

To retrieve data from the database and construct objects, use the query objects SQL string.

All of the above

Correct! Wrong!

Explanation:
Query objects retrieve data from the database and construct objects using SQL or Hibernate Query Language (HQL) strings. A Query instance is used to bind query parameters, limit the number of results returned by a query, and then execute the query.

What is the difference between the session object's save() and persist() methods?

save saves the object and returns status whereas persist store status in different

save saves the object and returns the id of the instance whereas peresist do not return anything after saving the instance

There is no difference

None of these

Correct! Wrong!

Explanation:
Persist does not return anything after saving the instance, whereas save saves the object and returns the instance's id.

Which of the following statements concerning the @Id annotation is correct?

Hibernate assumes that it should access properties on an object directly through fields at runtime

Hibernate detects that the @ld annotation is on a field

Both of the above

None ot these

Correct! Wrong!

Explanation:
Hibernate recognizes the @Id annotation on a field and thinks that during runtime, it should be able to access attributes on an object directly through fields.

Which of the following statements about ORM vs. JDBC is correct?

ORM system helps in Transaction management and automatic key generation

ORM system lets business code a access objects rather than DB tables

ORM system hides details of SQL queries from OO logic

All of these

Correct! Wrong!

Explanation:
When it comes to ORM vs JDBC, all of the above is true.

When should you utilize a read-only concurrency strategy?

Use this strategy for read-mostly data where it is critical to prevent stale data in concurrent transactions

Use this method if data is rarely updated and a slight chance of stale data isn't a major concern.

Use it for reference data only

None of the above

Correct! Wrong!

Explanation:
The read-only concurrency method is appropriate for data that does not change. It should only be used as a source of information.

In Hibernate, what is Query Level Cache?

Is the SessionFactory object thread-safe?

What is the meaning of lazy loading?

In the hibernate configuration, which of the following statements concerning the hibernate.dialect property is true?

Which of the following statements concerning Hibernate's Query object is correct?

What is the difference between the session object's save() and persist() methods?

Which of the following statements concerning the @Id annotation is correct?

Which of the following statements about ORM vs. JDBC is correct?

When should you utilize a read-only concurrency strategy?

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