FlushModeType (Java EE 5 SDK)

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Java EE 5 SDK

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摘要: 嵌套 | ENUM 构造器 | 字段 | 方法

详细信息: ENUM 构造器 | 字段 | 方法

javax.persistence Enum FlushModeType

java.lang.Object
  java.lang.Enum<FlushModeType>
      javax.persistence.FlushModeType

所有已实现的接口:: Serializable, Comparable<FlushModeType>

public enum FlushModeType
extends Enum<FlushModeType>

Flush mode setting.

When queries are executed within a transaction, if FlushModeType.AUTO is set on the Query object, or if the flush mode setting for the persistence context is AUTO (the default) and a flush mode setting has not been specified for the Query object, the persistence provider is responsible for ensuring that all updates to the state of all entities in the persistence context which could potentially affect the result of the query are visible to the processing of the query. The persistence provider implementation may achieve this by flushing those entities to the database or by some other means. If FlushModeType.COMMIT is set, the effect of updates made to entities in the persistence context upon queries is unspecified.

If there is no transaction active, the persistence provider must not flush to the database.

从以下版本开始:: Java Persistence 1.0

Enum 常量摘要
`AUTO` (Default) Flushing to occur at query execution
`COMMIT` Flushing must occur only at transaction commit

方法摘要
`static FlushModeType`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static FlushModeType[]`	`values()` Returns an array containing the constants of this enum type, in the order they're declared.

类方法继承 java.lang.Enum
`clone, compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

类方法继承 java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Enum 常量详细信息

COMMIT

public static final FlushModeType COMMIT

Flushing must occur only at transaction commit

AUTO

public static final FlushModeType AUTO

(Default) Flushing to occur at query execution

方法详细信息

values

public static final FlushModeType[] values()

Returns an array containing the constants of this enum type, in the order they're declared. This method may be used to iterate over the constants as follows:

for(FlushModeType c : FlushModeType.values())
        System.out.println(c);

返回:: an array containing the constants of this enum type, in the order they're declared

valueOf

public static FlushModeType valueOf(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.)

参数:: name - the name of the enum constant to be returned.
返回:: the enum constant with the specified name
抛出异常:: IllegalArgumentException - if this enum type has no constant with the specified name

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