1、MySQL
'READ-COMMITTED' # 已提交读
'READ-UNCOMMITTED' # 未提交读
'REPEATABLE-READ' # 可重复读
'SERIALIZABLE' # 串行化
SELECT @@transaction_isolation;
SELECT @@session.transaction_isolation;
SELECT @@global.transaction_isolation;
set @@global.transaction_isolation= 'READ-COMMITTED'; //全局
set @@session.transaction_isolation= 'READ-COMMITTED'; //当前session
set @@transaction_isolation = 'READ-COMMITTED'; //仅对下一个事务生效