不考慮并發(fā)條件下的代碼例子,不也是加上了number=#{number},應(yīng)該不會(huì)發(fā)生超賣呀?
MySQL 樂觀鎖與悲觀鎖悲觀鎖 悲觀鎖(Pessimistic Lock),顧名思義,就是很悲觀,每次去拿數(shù)據(jù)的時(shí)候都認(rèn)為別人會(huì)修改,所以每次在拿數(shù)據(jù)的時(shí)候都會(huì)上鎖,這樣別人想拿這個(gè)數(shù)據(jù)就會(huì)bloc...
不考慮并發(fā)條件下的代碼例子,不也是加上了number=#{number},應(yīng)該不會(huì)發(fā)生超賣呀?
MySQL 樂觀鎖與悲觀鎖悲觀鎖 悲觀鎖(Pessimistic Lock),顧名思義,就是很悲觀,每次去拿數(shù)據(jù)的時(shí)候都認(rèn)為別人會(huì)修改,所以每次在拿數(shù)據(jù)的時(shí)候都會(huì)上鎖,這樣別人想拿這個(gè)數(shù)據(jù)就會(huì)bloc...