public enum Propagation {
//默认值
//当前有事务,就加入这个事务,没有事务,就新建一个事务
REQUIRED(TransactionDefinition.PROPAGATION_REQUIRED),
//当前有事务,就加入这个事务,没有事务,就以非事务的方式执行
SUPPORTS(TransactionDefinition.PROPAGATION_SUPPORTS),
//当前有事务,就加入这个事务,没有事务,就抛出异常
MANDATORY(TransactionDefinition.PROPAGATION_MANDATORY),
//新建一个事务执行,如果当前有事务,就把当前的事务挂起
REQUIRES_NEW(TransactionDefinition.PROPAGATION_REQUIRES_NEW),
//在无事务状态下执行,如果当前有事务,就把当前的事务挂起
NOT_SUPPORTED(TransactionDefinition.PROPAGATION_NOT_SUPPORTED),
//在无事务状态下执行,如果当前有事务,会抛出异常
NEVER(TransactionDefinition.PROPAGATION_NEVER),
/**
* Execute within a nested transaction if a current transaction exists,
* behave like PROPAGATION_REQUIRED else. There is no analogous feature in EJB.
* <p>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 when working on a JDBC 3.0 driver.
* Some JTA providers might support nested transactions as well.
* @see org.springframework.jdbc.datasource.DataSourceTransactionManager
*/
//当前有事务,就新建一个事务,嵌套执行,当前无事务,就新建一个事务执行
//这个看了不同的文章,说法不一致,建议看下源码注释。
NESTED(TransactionDefinition.PROPAGATION_NESTED);
private final int value;
Propagation(int value) { this.value = value; }
public int value() { return this.value; }
}
REQUIRED(TransactionDefinition.PROPAGATION_REQUIRED),
SUPPORTS(TransactionDefinition.PROPAGATION_SUPPORTS),
MANDATORY(TransactionDefinition.PROPAGATION_MANDATORY),
REQUIRES_NEW(TransactionDefinition.PROPAGATION_REQUIRES_NEW),
NOT_SUPPORTED(TransactionDefinition.PROPAGATION_NOT_SUPPORTED),
NEVER(TransactionDefinition.PROPAGATION_NEVER),
NESTED(TransactionDefinition.PROPAGATION_NESTED);