javax.persistence.FetchType - JPA enum
javax.persistence
Enum FetchType
java.lang.Object
java.lang.Enum<javax.persistence.FetchType>
javax.persistence.FetchType
- Implemented Interfaces:
-
Serializable,Comparable<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:
- JPA 1.0
- See Also:
-
Basic -
ElementCollection -
ManyToMany -
OneToMany -
ManyToOne -
OneToOne
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.
- 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
Returns an array containing the constants of this enum type.
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
