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小鋒 2023-03-29 10:59:38 

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• 匿名(ming)用戶 2023-03-29 10:59:38

  　　redis事(shi)務(wu)(wu)(wu)(wu)是(shi)一(yi)組(zu)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，可以原子性地執(zhi)(zhi)(zhi)行(xing)(xing)(xing)一(yi)系列(lie)(lie)(lie)(lie)(lie)(lie)redis命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)。當(dang)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)完所(suo)(suo)有(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后，才會(hui)將結果(guo)(guo)(guo)返(fan)回(hui)(hui)給客(ke)(ke)戶(hu)(hu)端。如(ru)(ru)(ru)果(guo)(guo)(guo)任意一(yi)條命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)失(shi)(shi)敗，則全部回(hui)(hui)滾。在(zai)redis中(zhong)，事(shi)務(wu)(wu)(wu)(wu)通過MULTI、EXEC、DISCARD和WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)來實現(xian)。這些命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)使(shi)redis能夠提供一(yi)種可靠的(de)應(ying)用(yong)(yong)程序編程模型，可以保(bao)證數(shu)據的(de)一(yi)致(zhi)性和可靠性。MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)(yong)于(yu)開始一(yi)個(ge)(ge)(ge)(ge)事(shi)務(wu)(wu)(wu)(wu)。執(zhi)(zhi)(zhi)行(xing)(xing)(xing)MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后，所(suo)(suo)有(you)后續發送到(dao)redis服務(wu)(wu)(wu)(wu)器的(de)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都(dou)將被(bei)放入(ru)事(shi)務(wu)(wu)(wu)(wu)隊(dui)(dui)列(lie)(lie)(lie)(lie)(lie)(lie)中(zhong)，而不(bu)是(shi)立(li)即執(zhi)(zhi)(zhi)行(xing)(xing)(xing)。這個(ge)(ge)(ge)(ge)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)沒有(you)參(can)數(shu)，只需要調(diao)用(yong)(yong)即可。EXEC命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)(yong)于(yu)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)一(yi)個(ge)(ge)(ge)(ge)事(shi)務(wu)(wu)(wu)(wu)，并(bing)將事(shi)務(wu)(wu)(wu)(wu)隊(dui)(dui)列(lie)(lie)(lie)(lie)(lie)(lie)中(zhong)的(de)所(suo)(suo)有(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)打包(bao)成(cheng)一(yi)個(ge)(ge)(ge)(ge)原子性操作。如(ru)(ru)(ru)果(guo)(guo)(guo)所(suo)(suo)有(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都(dou)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)成(cheng)功，則返(fan)回(hui)(hui)每個(ge)(ge)(ge)(ge)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)的(de)結果(guo)(guo)(guo)。如(ru)(ru)(ru)果(guo)(guo)(guo)任意一(yi)條命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)失(shi)(shi)敗，則所(suo)(suo)有(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都(dou)將回(hui)(hui)滾并(bing)返(fan)回(hui)(hui)空。注意，如(ru)(ru)(ru)果(guo)(guo)(guo)使(shi)用(yong)(yong)WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)監視(shi)(shi)了一(yi)個(ge)(ge)(ge)(ge)鍵(jian)(jian)，那(nei)么如(ru)(ru)(ru)果(guo)(guo)(guo)該鍵(jian)(jian)在(zai)事(shi)務(wu)(wu)(wu)(wu)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)前被(bei)修改(gai)(gai)，事(shi)務(wu)(wu)(wu)(wu)將會(hui)中(zhong)止并(bing)返(fan)回(hui)(hui)空。DISCARD命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)(yong)于(yu)取消一(yi)個(ge)(ge)(ge)(ge)事(shi)務(wu)(wu)(wu)(wu)。如(ru)(ru)(ru)果(guo)(guo)(guo)在(zai)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后，客(ke)(ke)戶(hu)(hu)端不(bu)想執(zhi)(zhi)(zhi)行(xing)(xing)(xing)事(shi)務(wu)(wu)(wu)(wu)，可以使(shi)用(yong)(yong)DISCARD命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)將事(shi)務(wu)(wu)(wu)(wu)刪除。WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)(yong)于(yu)監視(shi)(shi)一(yi)個(ge)(ge)(ge)(ge)或多個(ge)(ge)(ge)(ge)鍵(jian)(jian)，當(dang)任何監視(shi)(shi)的(de)鍵(jian)(jian)被(bei)修改(gai)(gai)時，事(shi)務(wu)(wu)(wu)(wu)將被(bei)中(zhong)止。如(ru)(ru)(ru)果(guo)(guo)(guo)KEYS參(can)數(shu)是(shi)一(yi)個(ge)(ge)(ge)(ge)列(lie)(lie)(lie)(lie)(lie)(lie)表(biao)，那(nei)么將監視(shi)(shi)列(lie)(lie)(lie)(lie)(lie)(lie)表(biao)中(zhong)的(de)所(suo)(suo)有(you)鍵(jian)(jian)。通過調(diao)用(yong)(yong)WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，redis會(hui)將這些鍵(jian)(jian)放入(ru)一(yi)個(ge)(ge)(ge)(ge)監視(shi)(shi)隊(dui)(dui)列(lie)(lie)(lie)(lie)(lie)(lie)中(zhong)。如(ru)(ru)(ru)果(guo)(guo)(guo)事(shi)務(wu)(wu)(wu)(wu)中(zhong)執(zhi)(zhi)(zhi)行(xing)(xing)(xing)了一(yi)個(ge)(ge)(ge)(ge)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，且該命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)中(zhong)使(shi)用(yong)(yong)的(de)鍵(jian)(jian)被(bei)其他客(ke)(ke)戶(hu)(hu)端修改(gai)(gai)，則事(shi)務(wu)(wu)(wu)(wu)將自動回(hui)(hui)滾。

• 匿名用戶   2023-03-29 10:59:38

  　　Redis事(shi)(shi)(shi)(shi)(shi)務(wu)相關的(de)命(ming)令有以下(xia)幾個(ge)(ge)(ge)：- MULTI：開(kai)啟事(shi)(shi)(shi)(shi)(shi)務(wu)，Redis會將后(hou)續(xu)的(de)命(ming)令逐個(ge)(ge)(ge)放(fang)入隊列中(zhong)，然后(hou)使(shi)用EXEC命(ming)令來原子化執(zhi)(zhi)(zhi)行(xing)(xing)(xing)這(zhe)個(ge)(ge)(ge)命(ming)令系列。- EXEC：執(zhi)(zhi)(zhi)行(xing)(xing)(xing)事(shi)(shi)(shi)(shi)(shi)務(wu)中(zhong)的(de)所有操作(zuo)命(ming)令。- DISCARD：取(qu)消(xiao)事(shi)(shi)(shi)(shi)(shi)務(wu)，放(fang)棄執(zhi)(zhi)(zhi)行(xing)(xing)(xing)事(shi)(shi)(shi)(shi)(shi)務(wu)塊中(zhong)的(de)所有命(ming)令。- WATCH：監視(shi)一個(ge)(ge)(ge)或多個(ge)(ge)(ge)key，如(ru)果事(shi)(shi)(shi)(shi)(shi)務(wu)在執(zhi)(zhi)(zhi)行(xing)(xing)(xing)前，這(zhe)個(ge)(ge)(ge)key被其他命(ming)令修改，則事(shi)(shi)(shi)(shi)(shi)務(wu)被中(zhong)斷，不會執(zhi)(zhi)(zhi)行(xing)(xing)(xing)事(shi)(shi)(shi)(shi)(shi)務(wu)中(zhong)的(de)任何命(ming)令。

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