枚举 Propagation

枚举常量详细资料

• REQUIRED

  public static final Propagation REQUIRED

  Support a current transaction, create a new one if none exists. Analogous to EJB transaction attribute of the same name.

  This is the default setting of a transaction annotation.

• SUPPORTS

  public static final Propagation SUPPORTS

  Support a current transaction, execute non-transactionally if none exists. Analogous to EJB transaction attribute of the same name.

  Note: For transaction managers with transaction synchronization, SUPPORTS is slightly different from no transaction at all, as it defines a transaction scope that synchronization will apply for. As a consequence, the same resources (JDBC Connection, Hibernate Session, etc) will be shared for the entire specified scope. Note that this depends on the actual synchronization configuration of the transaction manager.

  另请参阅:

  AbstractPlatformTransactionManager.setTransactionSynchronization(int)

• MANDATORY

  public static final Propagation MANDATORY

  Support a current transaction, throw an exception if none exists. Analogous to EJB transaction attribute of the same name.

• REQUIRES_NEW

  public static final Propagation REQUIRES_NEW

  Create a new transaction, and suspend the current transaction if one exists. Analogous to the EJB transaction attribute of the same name.

  NOTE: Actual transaction suspension will not work out-of-the-box on all transaction managers. This in particular applies to JtaTransactionManager, which requires the javax.transaction.TransactionManager to be made available to it (which is server-specific in standard Java EE).

  另请参阅:

  JtaTransactionManager.setTransactionManager(javax.transaction.TransactionManager)

• NOT_SUPPORTED

  public static final Propagation NOT_SUPPORTED

  Execute non-transactionally, suspend the current transaction if one exists. Analogous to EJB transaction attribute of the same name.

  NOTE: Actual transaction suspension will not work out-of-the-box on all transaction managers. This in particular applies to JtaTransactionManager, which requires the javax.transaction.TransactionManager to be made available to it (which is server-specific in standard Java EE).

  另请参阅:

  JtaTransactionManager.setTransactionManager(javax.transaction.TransactionManager)

• NEVER

  public static final Propagation NEVER

  Execute non-transactionally, throw an exception if a transaction exists. Analogous to EJB transaction attribute of the same name.

• NESTED

  public static final Propagation NESTED

  Execute within a nested transaction if a current transaction exists, behave like REQUIRED otherwise. There is no analogous feature in EJB.

  Note: Actual creation of a nested transaction will only work on specific transaction managers. Out of the box, this only applies to the JDBC DataSourceTransactionManager. Some JTA providers might support nested transactions as well.

  另请参阅:

  DataSourceTransactionManager

方法详细资料

• values

  public static Propagation[] values()

  按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

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

  返回:

  按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

• valueOf

  public static Propagation valueOf​(String name)

  返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

  参数:

  name - 要返回的枚举常量的名称。

  返回:

  返回带有指定名称的枚举常量

  抛出:

  IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

  NullPointerException - 如果参数为空值

• value

  public int value()