Propagation.NESTED解释:
内嵌事务依赖于外部事务;若内部事务发生异常则回滚至内部事务开始的位置,继续执行外部事务;若内部事务正常处理完,外部事务发生异常,则外部事务同内部事务一起回滚;
若内部事务正常处理完,则继续进行外部事务,等外部事务处理完,两者一起提交或者一起回滚。
事务的隔离级别:
READ_COMMITTED 锁定正在读取的行
REPEATABLE_READ 锁定读取的所有行
SERIALIZABLE 锁表
/**
* Use the default isolation level of the underlying datastore.
* All other levels correspond to the JDBC isolation levels.
* @see java.sql.Connection
*/
DEFAULT(TransactionDefinition.ISOLATION_DEFAULT),
/**
* A constant indicating that dirty reads, non-repeatable reads and phantom reads
* can occur. This level allows a row changed by one transaction to be read by
* another transaction before any changes in that row have been committed
* (a "dirty read"). If any of the changes are rolled back, the second
* transaction will have retrieved an invalid row.
* @see java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
*/
READ_UNCOMMITTED(TransactionDefinition.ISOLATION_READ_UNCOMMITTED),
/**
* A constant indicating that dirty reads are prevented; non-repeatable reads
* and phantom reads can occur. This level only prohibits a transaction
* from reading a row with uncommitted changes in it.
* @see java.sql.Connection#TRANSACTION_READ_COMMITTED
*/
READ_COMMITTED(TransactionDefinition.ISOLATION_READ_COMMITTED),
/**
* A constant indicating that dirty reads and non-repeatable reads are
* prevented; phantom reads can occur. This level prohibits a transaction
* from reading a row with uncommitted changes in it, and it also prohibits
* the situation where one transaction reads a row, a second transaction
* alters the row, and the first transaction rereads the row, getting
* different values the second time (a "non-repeatable read").
* @see java.sql.Connection#TRANSACTION_REPEATABLE_READ
*/
REPEATABLE_READ(TransactionDefinition.ISOLATION_REPEATABLE_READ),
/**
* A constant indicating that dirty reads, non-repeatable reads and phantom
* reads are prevented. This level includes the prohibitions in
* <code>ISOLATION_REPEATABLE_READ</code> and further prohibits the situation
* where one transaction reads all rows that satisfy a <code>WHERE</code>
* condition, a second transaction inserts a row that satisfies that
* <code>WHERE</code> condition, and the first transaction rereads for the
* same condition, retrieving the additional "phantom" row in the second read.
* @see java.sql.Connection#TRANSACTION_SERIALIZABLE
*/
SERIALIZABLE(TransactionDefinition.ISOLATION_SERIALIZABLE);
spring 事务传播与隔离级别DEMO
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