spring 事务管理

事务：

是一组操作，要么全部执行，要么全部不执行。

public interface TransactionDefinition {

	int PROPAGATION_REQUIRED = 0;

	int PROPAGATION_SUPPORTS = 1;

	int PROPAGATION_MANDATORY = 2;

	int PROPAGATION_REQUIRES_NEW = 3;

	int PROPAGATION_NOT_SUPPORTED = 4;

	int PROPAGATION_NEVER = 5;

	int PROPAGATION_NESTED = 6;

	int ISOLATION_DEFAULT = -1;

	int ISOLATION_READ_UNCOMMITTED = Connection.TRANSACTION_READ_UNCOMMITTED;

	int ISOLATION_READ_COMMITTED = Connection.TRANSACTION_READ_COMMITTED;

	int ISOLATION_REPEATABLE_READ = Connection.TRANSACTION_REPEATABLE_READ;

	int ISOLATION_SERIALIZABLE = Connection.TRANSACTION_SERIALIZABLE;

	int TIMEOUT_DEFAULT = -1;

	int getPropagationBehavior();

	int getIsolationLevel();

	int getTimeout();

	boolean isReadOnly();

	String getName();

}