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小鋒(feng) 2023-03-29 10:59:38

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• 匿名用戶   2023-03-29 10:59:38

  　　redis事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)是一組命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，可(ke)(ke)(ke)以原子(zi)性(xing)(xing)地執(zhi)(zhi)(zhi)行(xing)(xing)一系列(lie)(lie)redis命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)。當執(zhi)(zhi)(zhi)行(xing)(xing)完所(suo)(suo)有(you)(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后(hou)，才會(hui)(hui)將(jiang)(jiang)(jiang)結果(guo)(guo)返(fan)回(hui)(hui)給客(ke)戶端(duan)。如(ru)果(guo)(guo)任意(yi)(yi)(yi)一條(tiao)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)執(zhi)(zhi)(zhi)行(xing)(xing)失敗，則全部回(hui)(hui)滾(gun)。在redis中(zhong)，事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)通(tong)過MULTI、EXEC、DISCARD和WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)來實現。這(zhe)些命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)使(shi)redis能夠提供一種可(ke)(ke)(ke)靠的(de)(de)應用(yong)程序編程模型(xing)，可(ke)(ke)(ke)以保(bao)證數(shu)據的(de)(de)一致性(xing)(xing)和可(ke)(ke)(ke)靠性(xing)(xing)。MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)于開(kai)始一個(ge)(ge)(ge)(ge)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)。執(zhi)(zhi)(zhi)行(xing)(xing)MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后(hou)，所(suo)(suo)有(you)(you)后(hou)續發送(song)到redis服務(wu)(wu)(wu)(wu)器的(de)(de)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都將(jiang)(jiang)(jiang)被放入(ru)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)隊(dui)列(lie)(lie)中(zhong)，而不(bu)(bu)是立即(ji)執(zhi)(zhi)(zhi)行(xing)(xing)。這(zhe)個(ge)(ge)(ge)(ge)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)沒(mei)有(you)(you)參數(shu)，只需(xu)要調用(yong)即(ji)可(ke)(ke)(ke)。EXEC命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)用(yong)于執(zhi)(zhi)(zhi)行(xing)(xing)一個(ge)(ge)(ge)(ge)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)，并(bing)將(jiang)(jiang)(jiang)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)隊(dui)列(lie)(lie)中(zhong)的(de)(de)所(suo)(suo)有(you)(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)打包(bao)成一個(ge)(ge)(ge)(ge)原子(zi)性(xing)(xing)操作。如(ru)果(guo)(guo)所(suo)(suo)有(you)(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都執(zhi)(zhi)(zhi)行(xing)(xing)成功，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)(de)結果(guo)(guo)。如(ru)果(guo)(guo)任意(yi)(yi)(yi)一條(tiao)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)執(zhi)(zhi)(zhi)行(xing)(xing)失敗，則所(suo)(suo)有(you)(you)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)都將(jiang)(jiang)(jiang)回(hui)(hui)滾(gun)并(bing)返(fan)回(hui)(hui)空。注(zhu)意(yi)(yi)(yi)，如(ru)果(guo)(guo)使(shi)用(yong)WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)監(jian)(jian)視(shi)了(le)一個(ge)(ge)(ge)(ge)鍵(jian)，那么如(ru)果(guo)(guo)該(gai)鍵(jian)在事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)執(zhi)(zhi)(zhi)行(xing)(xing)前被修改(gai)，事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)將(jiang)(jiang)(jiang)會(hui)(hui)中(zhong)止(zhi)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)于取消一個(ge)(ge)(ge)(ge)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)。如(ru)果(guo)(guo)在執(zhi)(zhi)(zhi)行(xing)(xing)MULTI命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)后(hou)，客(ke)戶端(duan)不(bu)(bu)想執(zhi)(zhi)(zhi)行(xing)(xing)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)，可(ke)(ke)(ke)以使(shi)用(yong)DISCARD命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)將(jiang)(jiang)(jiang)事(shi)(shi)(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)于監(jian)(jian)視(shi)一個(ge)(ge)(ge)(ge)或多個(ge)(ge)(ge)(ge)鍵(jian)，當任何監(jian)(jian)視(shi)的(de)(de)鍵(jian)被修改(gai)時(shi)，事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)將(jiang)(jiang)(jiang)被中(zhong)止(zhi)。如(ru)果(guo)(guo)KEYS參數(shu)是一個(ge)(ge)(ge)(ge)列(lie)(lie)表(biao)，那么將(jiang)(jiang)(jiang)監(jian)(jian)視(shi)列(lie)(lie)表(biao)中(zhong)的(de)(de)所(suo)(suo)有(you)(you)鍵(jian)。通(tong)過調用(yong)WATCH命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，redis會(hui)(hui)將(jiang)(jiang)(jiang)這(zhe)些鍵(jian)放入(ru)一個(ge)(ge)(ge)(ge)監(jian)(jian)視(shi)隊(dui)列(lie)(lie)中(zhong)。如(ru)果(guo)(guo)事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)中(zhong)執(zhi)(zhi)(zhi)行(xing)(xing)了(le)一個(ge)(ge)(ge)(ge)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)，且該(gai)命(ming)(ming)(ming)(ming)(ming)(ming)令(ling)(ling)(ling)(ling)(ling)(ling)(ling)中(zhong)使(shi)用(yong)的(de)(de)鍵(jian)被其(qi)他(ta)客(ke)戶端(duan)修改(gai)，則事(shi)(shi)(shi)務(wu)(wu)(wu)(wu)將(jiang)(jiang)(jiang)自動回(hui)(hui)滾(gun)。

• 匿(ni)名用戶   2023-03-29 10:59:38

  　　Redis事務(wu)相關的命令有(you)以下幾(ji)個：- MULTI：開啟(qi)事務(wu)，Redis會(hui)(hui)將后續的命令逐個放入隊(dui)列(lie)中，然后使用(yong)EXEC命令來(lai)原(yuan)子化執行這個命令系列(lie)。- EXEC：執行事務(wu)中的所有(you)操作命令。- DISCARD：取(qu)消(xiao)事務(wu)，放棄執行事務(wu)塊(kuai)中的所有(you)命令。- WATCH：監視一(yi)個或多個key，如果事務(wu)在(zai)執行前，這個key被其他命令修改，則事務(wu)被中斷(duan)，不會(hui)(hui)執行事務(wu)中的任(ren)何命令。

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