{"id":44473,"date":"2024-12-01T09:16:57","date_gmt":"2024-12-01T01:16:57","guid":{"rendered":"https:\/\/fwq.ai\/blog\/44473\/"},"modified":"2024-12-01T09:16:57","modified_gmt":"2024-12-01T01:16:57","slug":"redis-setifabsent%e8%bf%94%e5%9b%9enull%e7%9a%84%e9%97%ae%e9%a2%98%e5%8f%8a%e8%a7%a3%e5%86%b3","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/44473\/","title":{"rendered":"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>redis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3<\/h1>\n<p><span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p><span style=\"font-family:\">\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929golang\u5b66\u4e60\u7f51\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;font-family:\">\u300aredis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<span style=\"color: #FF6600;font-family:\">redissetIfAbsent\u3001null<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60<span style=\"color: #FF6600;font-family:\">\u6570\u636e\u5e93<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span><\/p>\n<h2>\u8d77\u56e0<\/h2>\n<p>\u4eca\u5929\u5728\u5199\u4e1a\u52a1\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u7528\u5230\u4e86StringRedisTemplate\u4e2dredisTemplate.opsForValue().setIfAbsent()\u4e2d\u5e76\u4e0d\u662f\u6211\u671f\u671b\u7684true\u6216\u8005false\u800c\u662f\u8fd4\u56de\u4e86null\uff0c\u8d77\u521d\u6211\u8fd8\u4ee5\u4e3a\u662f\u56e0\u4e3aReturns:null when used in pipeline \/ transaction.\u8fd9\u4e2a\u539f\u56e0\uff0c\u4f46\u662f\u6211\u5e76\u6ca1\u6709\u5728\u4e1a\u52a1\u4e2d\u4f7f\u7528\u5230\u4e8b\u52a1\u3002<\/p>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954263f96846c6630.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe\" \/><\/p>\n<h2>\u539f\u56e0<\/h2>\n<p>\u9042\u4f7f\u7528\u8c37\u6b4c\u5927\u6cd5\uff0c\u624d\u641c\u5230\u539f\u6765\u8fd9\u662f\u56e0\u4e3aRedisson\u7684bug\uff0c\u7f51\u53cb\u7ed9\u51fa\u7684\u89e3\u51b3\u65b9\u6848\u662f\u53bb\u6389\u5c31\u597d\u4e86\uff0c\u4f46\u662f\u4e0d\u53ef\u80fd\u56e0\u4e3a\u8fd9\u4e2a\u95ee\u9898\u5c31\u4e0d\u4f7f\u7528Redisson\uff0c\u770b\u6765\u53c8\u770b\u4f46\u4e00\u4e2a\u5e16\u5b50\uff0c\u8bf4\u8fd9\u662fredisson\u7684bug\u3002<\/p>\n<p>\u770b\u5230\u8fd9\u91cc\uff0c\u6211\u5c31\u60f3\u5230\u53bb\u770b\u770bgithub\u4e2d\u662f\u4e0d\u662f\u6709\u76f8\u5173\u7684issue\u5462\uff1f<\/p>\n<h2>\u89e3\u51b3<\/h2>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954363f96847471f8.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe1\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe1\" \/><\/p>\n<p>\u679c\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6709\u4e24\u4e2aissue\u662f\u5173\u4e8esetIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\uff0c\u8ba9\u6211\u4eec\u53bb\u3002<\/p>\n<p>\u5176\u4e2d\u63d0\u5230\u5728#2811\u4e2d\u4fee\u590d<\/p>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954363f96847aa31c.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe2\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe2\" \/><\/p>\n<p>\u4e5f\u53ef\u4ee5\u660e\u786e\u770b\u5230\u5173\u4e8e\u6b64bug\u7684\u4fee\u590d\u4ee3\u7801<\/p>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954463f9684804470.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe3\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe3\" \/><\/p>\n<p>\u8ba9\u6211\u4eec\u4e00\u8d77\u770b\u770b\u8fd9\u4e2aBooleanNullSafeReplayConvertor\u662f\u4f55\u65b9\u795e\u5723\uff0c\u600e\u4e48\u89e3\u51b3\u7684\u8fd4\u56de\u503c\u4e3anull\u7684bug.<\/p>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954463f9684859dc8.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe4\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe4\" \/><\/p>\n<p>\u5176\u5b9e\u89e3\u51b3\u7684\u65b9\u5f0f\u4e5f\u5f88\u7b80\u5355\u66b4\u529b\uff0c\u5c31\u662f\u628a\u4e4b\u524d\u7684obj == null return null\u6539\u4e3a\u4e86obj == null return false\u5e76\u4e14\u53bb\u6389\u4e86\u6cdb\u578b\u3002<\/p>\n<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230225\/167728954463f96848bec3b.png\" class=\"aligncenter\" title=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe5\" alt=\"redis\u00a0setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u63d2\u56fe5\" \/><\/p>\n<p>\u4ee5\u4e0a\u4e3a\u4e2a\u4eba\u7ecf\u9a8c\uff0c\u5e0c\u671b\u80fd\u7ed9\u5927\u5bb6\u4e00\u4e2a\u53c2\u8003\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u591a\u591a\u652f\u6301golang\u5b66\u4e60\u7f51\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aredis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8golang\u5b66\u4e60\u7f51\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01<\/p>\n<p>    \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1a\u811a\u672c\u4e4b\u5bb6 \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664  <\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u4f7f\u7528RedisAtomicInteger\u8ba1\u6570\u51fa\u73b0\u5c11\u8ba1\u95ee\u9898\u53ca\u89e3\u51b3\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   RedisRDB\u4e0eAOF\u6301\u4e45\u5316\u65b9\u5f0f\u8be6\u7ec6\u8bb2\u89e3\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>redis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3 0\u6d4f\u89c8 \u6536\u85cf \u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929golang\u5b66\u4e60\u7f51\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aredis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u300b\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542bredissetIfAbsent\u3001null\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60\u6570\u636e\u5e93\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01 \u8d77\u56e0 \u4eca\u5929\u5728\u5199\u4e1a\u52a1\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u7528\u5230\u4e86StringRedisTemplate\u4e2dredisTemplate.opsForValue().setIfAbsent()\u4e2d\u5e76\u4e0d\u662f\u6211\u671f\u671b\u7684true\u6216\u8005false\u800c\u662f\u8fd4\u56de\u4e86null\uff0c\u8d77\u521d\u6211\u8fd8\u4ee5\u4e3a\u662f\u56e0\u4e3aReturns:null when used in pipeline \/ transaction.\u8fd9\u4e2a\u539f\u56e0\uff0c\u4f46\u662f\u6211\u5e76\u6ca1\u6709\u5728\u4e1a\u52a1\u4e2d\u4f7f\u7528\u5230\u4e8b\u52a1\u3002 \u539f\u56e0 \u9042\u4f7f\u7528\u8c37\u6b4c\u5927\u6cd5\uff0c\u624d\u641c\u5230\u539f\u6765\u8fd9\u662f\u56e0\u4e3aRedisson\u7684bug\uff0c\u7f51\u53cb\u7ed9\u51fa\u7684\u89e3\u51b3\u65b9\u6848\u662f\u53bb\u6389\u5c31\u597d\u4e86\uff0c\u4f46\u662f\u4e0d\u53ef\u80fd\u56e0\u4e3a\u8fd9\u4e2a\u95ee\u9898\u5c31\u4e0d\u4f7f\u7528Redisson\uff0c\u770b\u6765\u53c8\u770b\u4f46\u4e00\u4e2a\u5e16\u5b50\uff0c\u8bf4\u8fd9\u662fredisson\u7684bug\u3002 \u770b\u5230\u8fd9\u91cc\uff0c\u6211\u5c31\u60f3\u5230\u53bb\u770b\u770bgithub\u4e2d\u662f\u4e0d\u662f\u6709\u76f8\u5173\u7684issue\u5462\uff1f \u89e3\u51b3 \u679c\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6709\u4e24\u4e2aissue\u662f\u5173\u4e8esetIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\uff0c\u8ba9\u6211\u4eec\u53bb\u3002 \u5176\u4e2d\u63d0\u5230\u5728#2811\u4e2d\u4fee\u590d \u4e5f\u53ef\u4ee5\u660e\u786e\u770b\u5230\u5173\u4e8e\u6b64bug\u7684\u4fee\u590d\u4ee3\u7801 \u8ba9\u6211\u4eec\u4e00\u8d77\u770b\u770b\u8fd9\u4e2aBooleanNullSafeReplayConvertor\u662f\u4f55\u65b9\u795e\u5723\uff0c\u600e\u4e48\u89e3\u51b3\u7684\u8fd4\u56de\u503c\u4e3anull\u7684bug. \u5176\u5b9e\u89e3\u51b3\u7684\u65b9\u5f0f\u4e5f\u5f88\u7b80\u5355\u66b4\u529b\uff0c\u5c31\u662f\u628a\u4e4b\u524d\u7684obj == null return null\u6539\u4e3a\u4e86obj == null return false\u5e76\u4e14\u53bb\u6389\u4e86\u6cdb\u578b\u3002 \u4ee5\u4e0a\u4e3a\u4e2a\u4eba\u7ecf\u9a8c\uff0c\u5e0c\u671b\u80fd\u7ed9\u5927\u5bb6\u4e00\u4e2a\u53c2\u8003\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u591a\u591a\u652f\u6301golang\u5b66\u4e60\u7f51\u3002 \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aredis&nbsp;setIfAbsent\u8fd4\u56denull\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8golang\u5b66\u4e60\u7f51\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01 \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1a\u811a\u672c\u4e4b\u5bb6 \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664 \u4f7f\u7528RedisAtomicInteger\u8ba1\u6570\u51fa\u73b0\u5c11\u8ba1\u95ee\u9898\u53ca\u89e3\u51b3 RedisRDB\u4e0eAOF\u6301\u4e45\u5316\u65b9\u5f0f\u8be6\u7ec6\u8bb2\u89e3<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-44473","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/44473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=44473"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/44473\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=44473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=44473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=44473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}