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Java Enterprise Edition (EE)

FetchType


javax.persistence
Enum FetchType

java.lang.Object
  java.lang.Enum<FetchType>
      javax.persistence.FetchType
All Implemented Interfaces:
java.io.Serializable, java.lang.Comparable<FetchType>
public enum FetchType
extends java.lang.Enum<FetchType>

Defines strategies for fetching data from the database. The EAGER strategy is a requirement on the persistence provider runtime that data must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime that data should be fetched lazily when it is first accessed. The implementation is permitted to eagerly fetch data for which the LAZY strategy hint has been specified.

   Example:
   @Basic(fetch=LAZY)
   protected String getName() { return name; }
 

Since:
Java Persistence 1.0
See Also:
Basic, ElementCollection, ManyToMany, OneToMany, ManyToOne, OneToOne

Enum Constant Summary
EAGER
          Defines that data must be eagerly fetched.
LAZY
          Defines that data can be lazily fetched.
 
Method Summary
static FetchType valueOf(java.lang.String name)
          Returns the enum constant of this type with the specified name.
static FetchType[] values()
          Returns an array containing the constants of this enum type, in the order they are declared.
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Enum Constant Detail

LAZY

public static final FetchType LAZY
Defines that data can be lazily fetched.

EAGER

public static final FetchType EAGER
Defines that data must be eagerly fetched.

Method Detail

values

public static FetchType[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
for (FetchType c : FetchType.values())
    System.out.println(c);

Returns:
an array containing the constants of this enum type, in the order they are declared

valueOf

public static FetchType valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:
name - the name of the enum constant to be returned.
Returns:
the enum constant with the specified name
Throws:
java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
java.lang.NullPointerException - if the argument is null


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