Question

Question 1

The annotation that is used to identify the primary key attribute of a class.

Group of answer choices

Id

Column

Entity

OneToMany

Question 2

The entity manager method that selects a row from a table given a primary key.

Group of answer choices

getEntity

close

find

persist

Question 3

The annotation that is used to identify the tale that the class is mapped to.

Group of answer choices

Temporal

Id

Table

Entity

Question 4

The annotation that specifies the field in a table that the attribute is mapped to.

Group of answer choices

Column

Id

Entity

OnToMany

Flag this Question

Question 5

The annotation that specifies that a Java class is to be mapped to a table

Group of answer choices

Temporal

Id

Entity

Column

Answer 1

Question 1:

Answer:

The annotation that is used to identify the primary key attribute of a class is Id.

Explanation:

@Id - Each class will have a primary key, which you annotate on the class with the @Id annotation.

@Column - The @Column annotation is used to specify the details of the column to which a field or property will be mapped.

@Entity - The @Entity annotation marks a class as an entity bean, so it must have a no-argument constructor that is visible with at least protected scope.

@OneToMany - Uses one to many mapping to create 1..N relationship between entities or objects.

Question 2:

Answer:

The entity manager method that selects a row from a table given a primary key is find.

Explanation:

getEntity - There are three methods for getEntity : a)getEntityManagerFactory, b)getEntityGraph, c)getEntityGraphs.

close - Close an application-managed entity manager.

find - Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there.

persist - Make an instance managed and persistent.

Question 3:

Answer:

The annotation that is used to identify the table that the class is mapped to is Table.

Explanation:

@Temporal - @Temporal annotationis used to store in the database table on of the following column items:

1. DATE (java.sql.Date)
2. TIME (java.sql.Time)
3. TIMESTAMP (java.sql.Timestamp)

@Id - Each class will have a primary key, which you annotate on the class with the @Id annotation.

@Table - The @Table annotation allows to specify the details of the table that that the class is mapped to.

@Entity - The @Entity annotation marks a class as an entity bean, so it must have a no-argument constructor that is visible with at least protected scope.

Question 4:

Answer:

The annotation that specifies the field in a table that the attribute is mapped to is Column.

Explanation:

@Column - The @Column annotation is used to specify the details of the column to which a field or property will be mapped.

@Id - Each class will have a primary key, which you annotate on the class with the @Id annotation.

@Entity - The @Entity annotation marks a class as an entity bean, so it must have a no-argument constructor that is visible with at least protected scope.

@OneToMany - Uses one to many mapping to create 1..N relationship between entities or objects.

Question 5:

Answer:

The annotation that specifies that a Java class is to be mapped to a table is Entity.

Explanation:

@Temporal - @Temporal annotationis used to store in the database table on of the following column items:

1. DATE (java.sql.Date)
2. TIME (java.sql.Time)
3. TIMESTAMP (java.sql.Timestamp)

@Id - Each class will have a primary key, which you annotate on the class with the @Id annotation.

@Entity - The @Entity annotation marks a class as an entity bean, so it must have a no-argument constructor that is visible with at least protected scope.

@Column - The @Column annotation is used to specify the details of the column to which a field or property will be mapped.