{"id":121679,"date":"2026-11-03T09:40:51","date_gmt":"2026-11-03T01:40:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/121679.html"},"modified":"2026-11-03T09:40:51","modified_gmt":"2026-11-03T01:40:51","slug":"redis-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%88%e5%9b%9b%ef%bc%89%ef%bc%9alua-%e8%84%9a%e6%9c%ac","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/121679.html","title":{"rendered":"Redis \u5b66\u4e60\u7b14\u8bb0\uff08\u56db\uff09\uff1aLua \u811a\u672c"},"content":{"rendered":"<p>Lua \u811a\u672c\u662f Redis \u539f\u5b50\u6027\u7684\u7075\u9b42\u3002\u4e3a\u4ec0\u4e48 Redis \u7684\u4e8b\u52a1\u4e0d\u9760\u8c31&#xff1f;\u4e3a\u4ec0\u4e48\u9650\u6d41\u3001\u5206\u5e03\u5f0f\u9501\u3001\u9632\u8d85\u5356\u90fd\u8981\u9760 Lua&#xff1f;\u8fd9\u7bc7\u628a Lua \u5728 Redis \u91cc\u7684\u4f5c\u7528\u8bb2\u900f\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u4e3a\u4ec0\u4e48\u8981\u7528 Lua \u811a\u672c&#xff1f;<\/h3>\n<h4>1.1 \u5148\u770b\u4e00\u4e2a\u771f\u5b9e\u75db\u70b9<\/h4>\n<p>\u5047\u8bbe\u4f60\u8981\u505a&#034;\u9650\u6d41&#034;\u2014\u2014\u63a7\u5236\u67d0\u4e2a\u63a5\u53e3 1 \u79d2\u5185\u6700\u591a\u88ab\u8c03\u7528 10 \u6b21\u3002\u7528 Redis \u5b9e\u73b0&#xff1a;<\/p>\n<p>1. \u7528 INCR \u7ed9\u8ba1\u6570\u5668\u52a01<br \/>\n2. \u5224\u65ad\u52a0\u5b8c\u7684\u503c\u662f\u5426\u8d85\u8fc710<\/p>\n<p>\u8fd9\u4e24\u4e2a\u64cd\u4f5c&#xff0c;\u5982\u679c\u5206\u5f00\u6267\u884c&#xff1a;<\/p>\n<p>\u670d\u52a1A&#xff1a;INCR counter \u2192 \u5f97\u523011<br \/>\n\u670d\u52a1A&#xff1a;\u51c6\u5907\u5224\u65ad 11 &gt; 10&#xff08;\u4f46\u8fd8\u6ca1\u5224\u65ad&#xff09;<br \/>\n\u670d\u52a1B&#xff1a;INCR counter \u2192 \u5f97\u523012<br \/>\n\u670d\u52a1A&#xff1a;\u5224\u65ad 11 &gt; 10&#xff0c;\u8fd4\u56de&#034;\u8d85\u9650&#034;<br \/>\n\u670d\u52a1B&#xff1a;\u5224\u65ad 12 &gt; 10&#xff0c;\u8fd4\u56de&#034;\u8d85\u9650&#034;<\/p>\n<p>\u597d\u50cf\u6ca1\u95ee\u9898&#xff1f;\u4f46\u5982\u679c\u8981\u6c42\u662f\u539f\u5b50\u7684\u2014\u2014\u201c\u52a01\u548c\u5224\u65ad\u5fc5\u987b\u5728\u540c\u4e00\u77ac\u95f4\u5b8c\u6210&#xff0c;\u4e0d\u80fd\u88ab\u5176\u4ed6\u8bf7\u6c42\u63d2\u961f\u201d\u2014\u2014\u5355\u6761\u547d\u4ee4\u6ca1\u95ee\u9898&#xff0c;\u4f46\u591a\u6761\u547d\u4ee4\u4e4b\u95f4\u5c31\u53ef\u80fd\u88ab\u63d2\u961f&#xff0c;\u7ed3\u679c\u5c31\u9519\u4e86\u3002<\/p>\n<h4>1.2 Redis \u4e8b\u52a1&#xff08;MULTI&#xff09;\u4e3a\u4ec0\u4e48\u4e0d\u9760\u8c31<\/h4>\n<p>Redis \u6709\u4e8b\u52a1\u547d\u4ee4 MULTI \/ EXEC&#xff0c;\u4f46\u5b83\u7684&#034;\u4e8b\u52a1&#034;\u548c\u6211\u4eec\u7406\u89e3\u7684\u4e0d\u4e00\u6837&#xff1a;<\/p>\n<ul>\n<li>Redis \u4e8b\u52a1\u53ea\u80fd\u4fdd\u8bc1\u547d\u4ee4\u6309\u987a\u5e8f\u6267\u884c\u4e0d\u88ab\u63d2\u961f&#xff08;\u4e0d\u4f1a\u50cf\u591a\u7ebf\u7a0b\u90a3\u6837\u7a7f\u63d2&#xff09;<\/li>\n<li>\u4f46\u4e0d\u652f\u6301\u56de\u6eda&#xff01;\u5982\u679c\u4e2d\u95f4\u67d0\u6761\u547d\u4ee4\u6267\u884c\u5931\u8d25&#xff0c;\u524d\u9762\u6210\u529f\u7684\u4e0d\u4f1a\u64a4\u9500<\/li>\n<\/ul>\n<p>\u6bd4\u5982&#xff1a;<\/p>\n<p>MULTI<br \/>\nINCR counter       # \u6210\u529f<br \/>\nDECR non_exist     # \u62a5\u9519&#xff08;key\u7c7b\u578b\u4e0d\u5bf9&#xff09;<br \/>\nEXEC<br \/>\n# \u7ed3\u679c\u662f&#xff1a;counter \u5df2\u7ecf&#043;1\u4e86&#xff0c;\u4f46\u4e0d\u4f1a\u56de\u6eda<\/p>\n<p>\u6240\u4ee5\u5728 Redis \u91cc&#xff0c;\u9760\u4e8b\u52a1\u505a&#034;\u8981\u4e48\u5168\u90e8\u6210\u529f\u8981\u4e48\u5168\u90e8\u5931\u8d25&#034;\u662f\u4e0d\u53ef\u9760\u7684\u3002<\/p>\n<h4>1.3 Lua \u811a\u672c\u624d\u662f\u6b63\u89e3<\/h4>\n<p>Lua \u811a\u672c\u662f\u4e00\u4e2a\u6574\u4f53\u53d1\u9001\u7ed9 Redis&#xff0c;Redis \u4f1a\u4e00\u6b21\u6027\u6267\u884c\u5b8c\u6574\u4e2a\u811a\u672c&#xff0c;\u6267\u884c\u671f\u95f4\u4e0d\u4f1a\u88ab\u5176\u4ed6\u8bf7\u6c42\u6253\u65ad\u2014\u2014\u5929\u7136\u539f\u5b50\u3002<\/p>\n<p>\u670d\u52a1A&#xff1a;\u6267\u884c\u6574\u4e2aLua\u811a\u672c&#xff08;\u5185\u90e8\u5148INCR\u518d\u5224\u65ad&#xff09;<br \/>\n      \u2193 \u811a\u672c\u6267\u884c\u671f\u95f4&#xff0c;Redis\u4e0d\u5904\u7406\u4efb\u4f55\u5176\u4ed6\u8bf7\u6c42<br \/>\n\u670d\u52a1B&#xff1a;\u7b49\u5f85<br \/>\n\u670d\u52a1A&#xff1a;\u811a\u672c\u6267\u884c\u5b8c&#xff0c;\u5f97\u5230\u7ed3\u679c<\/p>\n<p>Lua \u811a\u672c\u6267\u884c\u7684\u7279\u6027&#xff1a;<\/p>\n<li>\u539f\u5b50\u6027 \u2014 \u6574\u4e2a\u811a\u672c\u4e00\u6b21\u6027\u6267\u884c&#xff0c;\u4e2d\u95f4\u4e0d\u7a7f\u63d2\u5176\u4ed6\u547d\u4ee4<\/li>\n<li>\u51cf\u5c11\u7f51\u7edc\u5f00\u9500 \u2014 \u539f\u672c\u8981\u53d1\u591a\u6761\u547d\u4ee4&#xff0c;\u73b0\u5728\u4e00\u6761\u811a\u672c\u641e\u5b9a<\/li>\n<li>\u53ef\u590d\u7528 \u2014 \u811a\u672c\u53ef\u4ee5\u63d0\u524d\u52a0\u8f7d&#xff0c;\u53cd\u590d\u8c03\u7528<\/li>\n<p>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 Redis \u7684\u9650\u6d41\u3001\u5206\u5e03\u5f0f\u9501\u3001\u9632\u8d85\u5356\u8fd9\u4e9b\u9700\u8981&#034;\u591a\u6b65\u539f\u5b50\u64cd\u4f5c&#034;\u7684\u573a\u666f&#xff0c;\u5168\u90e8\u7528 Lua \u811a\u672c\u5b9e\u73b0\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001Lua \u811a\u672c\u57fa\u7840\u8bed\u6cd5<\/h3>\n<h4>2.1 \u6700\u7b80\u5355\u7684 Lua<\/h4>\n<p>Lua \u811a\u672c\u672c\u8eab\u8bed\u6cd5\u5f88\u7b80\u5355&#xff0c;\u5148\u770b\u51e0\u4e2a\u57fa\u7840\u70b9&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u8fd9\u662f\u6ce8\u91ca<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5b9a\u4e49\u53d8\u91cf<\/span><br \/>\n<span class=\"token keyword\">local<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u5c0f\u660e&#034;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6761\u4ef6\u5224\u65ad<\/span><br \/>\n<span class=\"token keyword\">if<\/span> name <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\u5c0f\u660e&#034;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u8ba4\u8bc6\u4f60&#034;<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u4e0d\u8ba4\u8bc6&#034;<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<h4>2.2 \u5728 Redis \u91cc\u6267\u884c<\/h4>\n<p>\u7528 EVAL \u547d\u4ee4\u6267\u884c Lua \u811a\u672c&#xff1a;<\/p>\n<p>EVAL &#034;return &#039;hello redis&#039;&#034; 0<br \/>\n# \u8fd4\u56de&#xff1a;hello redis<\/p>\n<p>0 \u8868\u793a\u540e\u9762\u6ca1\u6709 KEYS \u53c2\u6570\u3002<\/p>\n<h4>2.3 \u5728 Lua \u91cc\u8c03\u7528 Redis \u547d\u4ee4<\/h4>\n<p>\u7528 redis.call() \u8c03\u7528 Redis \u547d\u4ee4&#xff1a;<\/p>\n<p>EVAL &#034;return redis.call(&#039;set&#039;, &#039;name&#039;, &#039;\u5c0f\u660e&#039;)&#034; 0<br \/>\n# \u6267\u884c\u4e86 SET name \u5c0f\u660e<\/p>\n<p>EVAL &#034;return redis.call(&#039;get&#039;, &#039;name&#039;)&#034; 0<br \/>\n# \u8fd4\u56de&#xff1a;\u5c0f\u660e<\/p>\n<p>\u4e5f\u53ef\u4ee5\u5728\u811a\u672c\u91cc\u7ec4\u5408\u591a\u6761\u547d\u4ee4&#xff0c;\u5b9e\u73b0\u539f\u5b50\u64cd\u4f5c&#xff1a;<\/p>\n<p>EVAL &#034;<br \/>\n    redis.call(&#039;set&#039;, &#039;count&#039;, 0)<br \/>\n    redis.call(&#039;incr&#039;, &#039;count&#039;)<br \/>\n    redis.call(&#039;incr&#039;, &#039;count&#039;)<br \/>\n    return redis.call(&#039;get&#039;, &#039;count&#039;)<br \/>\n&#034; 0<br \/>\n# \u8fd4\u56de&#xff1a;2<\/p>\n<p>\u6574\u4e2a\u811a\u672c\u4e00\u6b21\u6027\u6267\u884c\u5b8c&#xff0c;\u4e2d\u95f4\u4efb\u4f55\u8bf7\u6c42\u90fd\u65e0\u6cd5\u63d2\u961f\u3002<\/p>\n<hr \/>\n<h3>\u4e8c-\u8865\u5145\u3001Lua \u811a\u672c\u91cc\u7684\u6570\u636e\u7c7b\u578b<\/h3>\n<p>\u5199 Redis Lua \u811a\u672c\u65f6&#xff0c;\u8981\u6ce8\u610f Lua \u548c Redis \u4e4b\u95f4\u6570\u636e\u7c7b\u578b\u7684\u8f6c\u6362&#xff0c;\u8fd9\u662f\u65b0\u624b\u7ecf\u5e38\u8e29\u5751\u7684\u5730\u65b9\u3002<\/p>\n<h4>Redis \u8fd4\u56de\u7ed9 Lua \u7684\u7c7b\u578b<\/h4>\n<table>\n<tr>Redis \u8fd4\u56deLua \u4e2d\u53d8\u6210<\/tr>\n<tbody>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>number<\/td>\n<\/tr>\n<tr>\n<td>\u5b57\u7b26\u4e32<\/td>\n<td>string<\/td>\n<\/tr>\n<tr>\n<td>nil&#xff08;\u4e0d\u5b58\u5728&#xff09;<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>\u9519\u8bef<\/td>\n<td>\u629b\u5f02\u5e38&#xff08;\u53ef\u7528 pcall \u6355\u83b7&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7279\u522b\u6ce8\u610f&#xff1a;Redis \u7684 nil&#xff08;key\u4e0d\u5b58\u5728&#xff09;\u5728 Lua \u91cc\u662f false\u3002 \u5982\u679c\u4f60\u76f4\u63a5\u5bf9 false \u505a\u7b97\u672f\u8fd0\u7b97\u4f1a\u62a5\u9519&#xff0c;\u8981\u5224\u65ad\u4e00\u4e0b&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u9519\u8bef\u7684\u5199\u6cd5&#xff1a;key\u4e0d\u5b58\u5728\u65f6 redis.call(&#039;get&#039;,&#8230;) \u8fd4\u56de false<\/span><br \/>\n<span class=\"token comment\">&#8212; local stock &#061; tonumber(redis.call(&#039;get&#039;, KEYS[1]))  &#8212; \u5982\u679ckey\u4e0d\u5b58\u5728&#xff0c;tonumber(false)\u62a5\u9519<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6b63\u786e\u7684\u5199\u6cd5&#xff1a;\u5148\u5224\u65ad\u662f\u5426\u5b58\u5728<\/span><br \/>\n<span class=\"token keyword\">local<\/span> stock <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;get&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> stock <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">false<\/span> <span class=\"token keyword\">or<\/span> stock <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nil<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    stock <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span>   <span class=\"token comment\">&#8212; \u7ed9\u4e2a\u9ed8\u8ba4\u503c<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    stock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>stock<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<h4>Lua \u8fd4\u56de\u7ed9 Redis \u7684\u7c7b\u578b<\/h4>\n<table>\n<tr>Lua \u8fd4\u56deRedis \u7ed3\u679c<\/tr>\n<tbody>\n<tr>\n<td>number<\/td>\n<td>\u6574\u6570<\/td>\n<\/tr>\n<tr>\n<td>string<\/td>\n<td>\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td>false\/nil<\/td>\n<td>nil<\/td>\n<\/tr>\n<tr>\n<td>table<\/td>\n<td>\u6570\u7ec4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5e38\u89c1\u5751&#xff1a; \u811a\u672c\u91cc\u5bf9\u5b57\u7b26\u4e32\u505a\u7b97\u672f\u8fd0\u7b97&#xff0c;\u8981\u7528 tonumber() \u8f6c\u6210\u6570\u5b57&#xff0c;\u5426\u5219\u4f1a\u62a5\u9519\u6216\u5f97\u5230\u9519\u8bef\u7ed3\u679c&#xff1a;<\/p>\n<p><span class=\"token keyword\">local<\/span> count <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;incr&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; incr \u8fd4\u56de\u7684\u662f number&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u6bd4<\/span><br \/>\n<span class=\"token keyword\">if<\/span> count <span class=\"token operator\">&gt;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p>\u5982\u679c redis.call \u8fd4\u56de\u7684\u662f\u5b57\u7b26\u4e32&#xff08;\u6bd4\u5982 get&#xff09;&#xff0c;\u4e00\u5b9a\u8981\u5148 tonumber() \u518d\u6bd4\u8f83\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001KEYS \u548c ARGV \u53c2\u6570<\/h3>\n<h4>3.1 \u4e3a\u4ec0\u4e48\u8981\u4f20\u53c2\u6570<\/h4>\n<p>\u76f4\u63a5\u628a key \u5199\u6b7b\u5728\u811a\u672c\u91cc&#xff0c;\u6bcf\u6b21\u90fd\u8981\u91cd\u65b0\u5199\u811a\u672c&#xff0c;\u4e0d\u65b9\u4fbf\u3002\u66f4\u5173\u952e\u7684\u662f&#xff0c;Redis \u4e3b\u4ece\u590d\u5236\u548c\u96c6\u7fa4\u6a21\u5f0f\u4e0b&#xff0c;\u8981\u6c42\u811a\u672c\u91cc\u7684 key \u901a\u8fc7\u53c2\u6570\u4f20\u8fdb\u53bb&#xff0c;Redis \u624d\u80fd\u77e5\u9053\u64cd\u4f5c\u4e86\u54ea\u4e9b key&#xff08;\u96c6\u7fa4\u624d\u80fd\u8def\u7531\u5230\u6b63\u786e\u7684\u8282\u70b9&#xff09;\u3002<\/p>\n<p>\u6807\u51c6\u5199\u6cd5\u662f\u628a key \u7528 KEYS[] \u5f15\u7528&#xff0c;\u53c2\u6570\u7528 ARGV[] \u5f15\u7528\u3002<\/p>\n<h4>3.2 EVAL \u4f20\u53c2<\/h4>\n<p>EVAL &#034;<br \/>\n    redis.call(&#039;set&#039;, KEYS[1], ARGV[1])<br \/>\n    return redis.call(&#039;get&#039;, KEYS[1])<br \/>\n&#034; 1 mykey &#034;\u5c0f\u660e&#034;<\/p>\n<p>\u62c6\u89e3&#xff1a;<\/p>\n<ul>\n<li>1 \u8868\u793a\u67091\u4e2a key \u53c2\u6570<\/li>\n<li>mykey \u4f20\u7ed9 KEYS[1]<\/li>\n<li>&#034;\u5c0f\u660e&#034; \u4f20\u7ed9 ARGV[1]<\/li>\n<\/ul>\n<p>\u4e0b\u6807\u4ece1\u5f00\u59cb&#xff0c;\u4e0d\u662f0&#xff01; \u8fd9\u662f Lua \u548c\u5f88\u591a\u8bed\u8a00\u4e0d\u4e00\u6837\u7684\u5730\u65b9&#xff0c;\u522b\u641e\u9519\u3002<\/p>\n<h4>3.3 \u591a\u4e2a key \u548c\u53c2\u6570<\/h4>\n<p>EVAL &#034;<br \/>\n    redis.call(&#039;set&#039;, KEYS[1], ARGV[1])<br \/>\n    redis.call(&#039;set&#039;, KEYS[2], ARGV[2])<br \/>\n    return redis.call(&#039;mget&#039;, KEYS[1], KEYS[2])<br \/>\n&#034; 2 key1 key2 val1 val2<br \/>\n# KEYS[1]&#061;key1 KEYS[2]&#061;key2 ARGV[1]&#061;val1 ARGV[2]&#061;val2<\/p>\n<hr \/>\n<h3>\u56db\u3001\u7ecf\u5178\u5e94\u7528&#xff1a;\u5206\u5e03\u5f0f\u9501\u7684\u539f\u5b50\u91ca\u653e<\/h3>\n<p>\u4e0a\u4e00\u7ae0\u5206\u5e03\u5f0f\u9501\u91cc\u63d0\u5230\u8fc7&#xff1a;\u91ca\u653e\u9501\u8981&#034;\u5148\u5224\u65ad\u662f\u4e0d\u662f\u81ea\u5df1\u7684\u9501&#xff0c;\u518d\u5220\u9664&#034;&#xff0c;\u8fd9\u4e24\u6b65\u5fc5\u987b\u539f\u5b50\u3002<\/p>\n<p>\u7528 Lua \u811a\u672c\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u5224\u65ad\u9501\u7684\u503c\u662f\u4e0d\u662f\u81ea\u5df1\u7684&#xff0c;\u662f\u624d\u5220\u9664<\/span><br \/>\n<span class=\"token keyword\">if<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;get&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;del&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u5fc5\u987b\u7528 Lua&#xff1f; \u56e0\u4e3a&#034;get \u6bd4\u8f83 &#043; del \u5220\u9664&#034;\u662f\u4e24\u4e2a\u64cd\u4f5c&#xff0c;\u5982\u679c\u5206\u5f00\u6267\u884c&#xff1a;<\/p>\n<p>\u670d\u52a1A get lock \u2192 \u5f97\u5230\u81ea\u5df1\u7684\u503c \u2192 \u51c6\u5907del<br \/>\n&#xff08;\u8fd9\u65f6lock\u8fc7\u671f&#xff0c;\u670d\u52a1B\u62ff\u5230\u9501&#xff0c;\u503c\u53d8\u6210B\u7684&#xff09;<br \/>\n\u670d\u52a1A del lock \u2192 \u628a\u670d\u52a1B\u7684\u9501\u5220\u4e86&#xff01;<\/p>\n<p>\u7528 Lua \u628a\u6bd4\u8f83\u548c\u5220\u9664\u5305\u5728\u4e00\u4e2a\u811a\u672c\u91cc&#xff0c;Redis \u4e00\u6b21\u6027\u539f\u5b50\u6267\u884c&#xff0c;\u4e2d\u95f4\u4e0d\u53ef\u80fd\u88ab\u63d2\u961f&#xff0c;\u5c31\u4e0d\u4f1a\u8bef\u5220\u3002<\/p>\n<p>\u5728 Java \u91cc\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token class-name\">DefaultRedisScript<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> script <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DefaultRedisScript<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;if redis.call(&#039;get&#039;,KEYS[1])&#061;&#061;ARGV[1] then return redis.call(&#039;del&#039;,KEYS[1]) else return 0 end&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Long<\/span> result <span class=\"token operator\">&#061;<\/span> redisTemplate<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    script<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;lock&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ KEYS[1]<\/span><br \/>\n    myValue                   <span class=\"token comment\">\/\/ ARGV[1]<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u4e94\u3001\u7ecf\u5178\u5e94\u7528&#xff1a;\u9650\u6d41&#xff08;\u4ee4\u724c\u6876&#xff09;<\/h3>\n<p>\u9650\u6d41\u662f Lua \u7684\u7ecf\u5178\u5e94\u7528\u3002\u63a7\u5236\u67d0\u4e2a key \u5728\u4e00\u6bb5\u65f6\u95f4\u7a97\u53e3\u5185\u7684\u8bbf\u95ee\u6b21\u6570\u3002<\/p>\n<h4>5.1 \u601d\u8def<\/h4>\n<p>\u7528&#034;\u6ed1\u52a8\u7a97\u53e3&#034;\u601d\u8def&#xff1a;\u6bcf\u6b21\u8bf7\u6c42\u6765&#xff0c;\u7ed9\u5f53\u524d\u65f6\u95f4\u6233\u5bf9\u5e94\u7684\u8ba1\u6570\u52a01&#xff0c;\u540c\u65f6\u6e05\u7406\u6389\u7a97\u53e3\u4e4b\u5916\u7684\u8001\u8ba1\u6570&#xff0c;\u5224\u65ad\u7a97\u53e3\u5185\u603b\u6570\u662f\u5426\u8d85\u9650\u3002<\/p>\n<p>\u7528 Redis \u5b9e\u73b0\u6700\u7b80\u5355\u7684\u65b9\u5f0f\u2014\u2014\u56fa\u5b9a\u65f6\u95f4\u7a97\u53e3&#xff1a;\u6bcf\u4e2a\u5355\u4f4d\u65f6\u95f4\u4e00\u4e2a key&#xff0c;\u8fc7\u671f\u81ea\u52a8\u6e05\u7406\u3002<\/p>\n<p><span class=\"token comment\">&#8212; \u7b80\u5355\u9650\u6d41&#xff1a;\u6bcf\u5206\u949f\u6700\u591aN\u6b21<\/span><br \/>\n<span class=\"token comment\">&#8212; KEYS[1] &#061; \u9650\u6d41\u7684key&#xff08;\u5982 user:9527:api&#xff09;<\/span><br \/>\n<span class=\"token comment\">&#8212; ARGV[1] &#061; \u7a97\u53e3\u79d2\u6570<\/span><br \/>\n<span class=\"token comment\">&#8212; ARGV[2] &#061; \u6700\u5927\u6b21\u6570<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u8ba1\u6570\u5668\u52a01<\/span><br \/>\n<span class=\"token keyword\">local<\/span> current <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;incr&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7b2c\u4e00\u6b21\u8bbf\u95ee&#xff0c;\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4&#xff08;\u7a97\u53e3&#xff09;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> current <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;expire&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5224\u65ad\u662f\u5426\u8d85\u9650<\/span><br \/>\n<span class=\"token keyword\">if<\/span> current <span class=\"token operator\">&gt;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span>   <span class=\"token comment\">&#8212; \u62d2\u7edd<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span>   <span class=\"token comment\">&#8212; \u653e\u884c<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p>\u8fd9\u4e2a\u811a\u672c\u5b8c\u6574\u5b9e\u73b0\u4e86&#034;1\u79d2\u5185\u6700\u591aN\u6b21&#034;\u7684\u9650\u6d41&#xff0c;\u800c\u4e14\u56e0\u4e3a\u6574\u4e2a\u811a\u672c\u539f\u5b50\u6267\u884c&#xff0c;\u4e0d\u4f1a\u5e76\u53d1\u51fa\u9519\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u8981\u7528 Lua \u800c\u4e0d\u662f\u5206\u5f00\u547d\u4ee4&#xff1f; \u56e0\u4e3a&#034;incr \u8ba1\u6570 &#043; expire \u8bbe\u8fc7\u671f &#043; \u5224\u65ad\u8d85\u9650&#034;\u8981\u4fdd\u8bc1\u539f\u5b50\u6027&#xff0c;\u5206\u5f00\u5199\u5728\u9ad8\u5e76\u53d1\u4e0b\u4f1a\u7b97\u51fa\u9519\u8bef\u7ed3\u679c\u3002<\/p>\n<h4>5.2 \u66f4\u7cbe\u786e\u7684\u4ee4\u724c\u6876<\/h4>\n<p>Redis \u5b98\u65b9\u63d0\u4f9b\u7684\u4ee4\u724c\u6876\u9650\u6d41\u811a\u672c&#xff08;\u5b8c\u6574\u7248&#xff09;&#xff0c;\u7528 ZSET \u8bb0\u5f55\u8bf7\u6c42\u65f6\u95f4\u6233&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; KEYS[1] &#061; \u9650\u6d41key<\/span><br \/>\n<span class=\"token comment\">&#8212; ARGV[1] &#061; \u7a97\u53e3\u6beb\u79d2\u6570<\/span><br \/>\n<span class=\"token comment\">&#8212; ARGV[2] &#061; \u6700\u5927\u8bf7\u6c42\u6570<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5f53\u524d\u65f6\u95f4<\/span><br \/>\n<span class=\"token keyword\">local<\/span> now <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;TIME&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1000<\/span><br \/>\n<span class=\"token comment\">&#8212; \u7a97\u53e3\u8d77\u59cb\u65f6\u95f4<\/span><br \/>\n<span class=\"token keyword\">local<\/span> window_start <span class=\"token operator\">&#061;<\/span> now <span class=\"token operator\">&#8211;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6e05\u7406\u7a97\u53e3\u5916\u7684\u8fc7\u671f\u8bf7\u6c42<\/span><br \/>\nredis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;ZREMRANGEBYSCORE&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> window_start<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u52a0\u5165\u5f53\u524d\u8bf7\u6c42<\/span><br \/>\nredis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;ZADD&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> now<span class=\"token punctuation\">,<\/span> now<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u7edf\u8ba1\u7a97\u53e3\u5185\u8bf7\u6c42\u6570<\/span><br \/>\n<span class=\"token keyword\">local<\/span> count <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;ZCARD&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> count <span class=\"token operator\">&gt;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token comment\">&#8212; \u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4&#xff0c;\u9632\u6b62ZSET\u65e0\u9650\u589e\u957f<\/span><br \/>\n    redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;EXPIRE&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p>\u8fd9\u662f\u751f\u4ea7\u7ea7\u9650\u6d41\u7684\u7ecf\u5178\u5199\u6cd5&#xff0c;\u9760 ZSET \u6309\u65f6\u95f4\u6233\u6392\u5e8f&#xff0c;\u6ed1\u52a8\u7a97\u53e3\u7edf\u8ba1\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u7ecf\u5178\u5e94\u7528&#xff1a;\u9632\u8d85\u5356<\/h3>\n<p>\u79d2\u6740\u573a\u666f\u7684\u6838\u5fc3\u95ee\u9898\u2014\u2014\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u6263\u5e93\u5b58&#xff0c;\u600e\u4e48\u4fdd\u8bc1\u4e0d\u8d85\u5356&#xff1f;<\/p>\n<p>\u7528 Lua \u811a\u672c\u539f\u5b50\u6263\u5e93\u5b58&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u539f\u5b50\u6263\u51cf\u5e93\u5b58&#xff0c;\u9632\u6b62\u8d85\u5356<\/span><br \/>\n<span class=\"token comment\">&#8212; KEYS[1] &#061; \u5e93\u5b58key<\/span><br \/>\n<span class=\"token comment\">&#8212; ARGV[1] &#061; \u6263\u51cf\u6570\u91cf<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5f53\u524d\u5e93\u5b58<\/span><br \/>\n<span class=\"token keyword\">local<\/span> stock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>redis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;get&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5e93\u5b58\u4e0d\u591f&#xff0c;\u8fd4\u56de-1\u8868\u793a\u5931\u8d25<\/span><br \/>\n<span class=\"token keyword\">if<\/span> stock <span class=\"token operator\">&lt;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">end<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6263\u51cf\u5e93\u5b58<\/span><br \/>\nredis<span class=\"token punctuation\">.<\/span><span class=\"token function\">call<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;decrby&#039;<\/span><span class=\"token punctuation\">,<\/span> KEYS<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u8fd4\u56de\u6263\u51cf\u540e\u7684\u5e93\u5b58<\/span><br \/>\n<span class=\"token keyword\">return<\/span> stock <span class=\"token operator\">&#8211;<\/span> <span class=\"token function\">tonumber<\/span><span class=\"token punctuation\">(<\/span>ARGV<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u80fd\u9632\u8d85\u5356&#xff1f; \u56e0\u4e3a&#034;get \u8bfb\u5e93\u5b58 \u2192 \u5224\u65ad\u591f\u4e0d\u591f \u2192 decrby \u6263\u51cf&#034;\u8fd9\u4e09\u6b65\u5728 Lua \u811a\u672c\u91cc\u662f\u539f\u5b50\u7684\u2014\u2014\u540c\u4e00\u65f6\u523b\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42\u5728\u6267\u884c\u8fd9\u4e2a\u811a\u672c&#xff0c;\u5176\u4ed6\u8bf7\u6c42\u90fd\u5728\u7b49\u5f85\u3002\u4e0d\u4f1a\u6709\u4e24\u4e2a\u4eba\u540c\u65f6\u8bfb\u5230&#034;\u8fd8\u67091\u4e2a\u5e93\u5b58&#034;\u7136\u540e\u90fd\u6263\u6210\u529f\u3002<\/p>\n<p>\u5982\u679c\u5206\u5f00\u5199&#xff08;\u5148 get \u518d decrby&#xff09;&#xff1a;<\/p>\n<p>\u670d\u52a1A get \u2192 \u5e93\u5b581<br \/>\n\u670d\u52a1B get \u2192 \u5e93\u5b581   \u2190 \u5e76\u53d1\u8bfb\u5230\u540c\u6837<br \/>\n\u670d\u52a1A decrby \u2192 \u5e93\u5b580<br \/>\n\u670d\u52a1B decrby \u2192 \u5e93\u5b58-1   \u2190 \u8d85\u5356\u4e86&#xff01;<\/p>\n<p>\u8fd9\u5c31\u662f\u79d2\u6740\u7cfb\u7edf\u5fc5\u987b\u7528 Lua \u7684\u539f\u56e0\u3002<\/p>\n<hr \/>\n<h3>\u4e03\u3001\u5728\u4ee3\u7801\u91cc\u6267\u884c Lua&#xff08;Java\/Python&#xff09;<\/h3>\n<h4>Java (Spring Data Redis)<\/h4>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u811a\u672c<\/span><br \/>\n<span class=\"token class-name\">DefaultRedisScript<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> stockScript <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DefaultRedisScript<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstockScript<span class=\"token punctuation\">.<\/span><span class=\"token function\">setResultType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstockScript<span class=\"token punctuation\">.<\/span><span class=\"token function\">setScriptText<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;local stock &#061; tonumber(redis.call(&#039;get&#039;, KEYS[1])) &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;if stock &lt; tonumber(ARGV[1]) then return -1 end &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;redis.call(&#039;decrby&#039;, KEYS[1], ARGV[1]) &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;return stock &#8211; tonumber(ARGV[1])&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6267\u884c<\/span><br \/>\n<span class=\"token class-name\">Long<\/span> result <span class=\"token operator\">&#061;<\/span> redisTemplate<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    stockScript<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stock:1001&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token comment\">\/\/ KEYS[1]<\/span><br \/>\n    <span class=\"token number\">1L<\/span>                             <span class=\"token comment\">\/\/ ARGV[1] \u6263\u51cf\u6570\u91cf<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6263\u51cf\u6210\u529f&#xff0c;\u5269\u4f59\u5e93\u5b58&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e93\u5b58\u4e0d\u8db3&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>Python (redis-py)<\/h4>\n<p><span class=\"token keyword\">import<\/span> redis<\/p>\n<p>r <span class=\"token operator\">&#061;<\/span> redis<span class=\"token punctuation\">.<\/span>Redis<span class=\"token punctuation\">(<\/span>decode_responses<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u811a\u672c&#xff1a;\u539f\u5b50\u6263\u5e93\u5b58<\/span><br \/>\nscript <span class=\"token operator\">&#061;<\/span> <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;<br \/>\nlocal stock &#061; tonumber(redis.call(&#039;get&#039;, KEYS[1]))<br \/>\nif stock &lt; tonumber(ARGV[1]) then<br \/>\n    return -1<br \/>\nend<br \/>\nredis.call(&#039;decrby&#039;, KEYS[1], ARGV[1])<br \/>\nreturn stock &#8211; tonumber(ARGV[1])<br \/>\n&#034;&#034;&#034;<\/span><\/p>\n<p><span class=\"token comment\"># \u6ce8\u518c\u811a\u672c&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u53ef\u8c03\u7528\u7684\u5bf9\u8c61<\/span><br \/>\ndeduct <span class=\"token operator\">&#061;<\/span> r<span class=\"token punctuation\">.<\/span>register_script<span class=\"token punctuation\">(<\/span>script<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u8c03\u7528&#xff1a;KEYS&#061;[&#039;stock:1001&#039;], ARGV&#061;[1]<\/span><br \/>\nresult <span class=\"token operator\">&#061;<\/span> deduct<span class=\"token punctuation\">(<\/span>keys<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;stock:1001&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> args<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> result <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;\u6263\u51cf\u6210\u529f&#xff0c;\u5269\u4f59\u5e93\u5b58&#xff1a;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>result<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e93\u5b58\u4e0d\u8db3&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u516b\u3001Lua \u811a\u672c\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n<h4>8.1 \u811a\u672c\u8981\u5c3d\u91cf\u77ed<\/h4>\n<p>Lua \u811a\u672c\u6267\u884c\u671f\u95f4&#xff0c;Redis \u4e0d\u5904\u7406\u5176\u4ed6\u8bf7\u6c42&#xff08;\u5355\u7ebf\u7a0b&#xff09;\u3002\u5982\u679c\u811a\u672c\u592a\u590d\u6742\u3001\u592a\u8017\u65f6&#xff0c;\u4f1a\u963b\u585e\u6574\u4e2a Redis&#xff0c;\u5f71\u54cd\u6240\u6709\u8bf7\u6c42\u3002<\/p>\n<p>\u539f\u5219&#xff1a;\u811a\u672c\u53ea\u505a\u5fc5\u8981\u7684\u539f\u5b50\u64cd\u4f5c&#xff0c;\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\u653e\u5e94\u7528\u5c42\u505a\u3002<\/p>\n<h4>8.2 \u4e0d\u80fd\u7528\u4e0d\u786e\u5b9a\u7684\u547d\u4ee4<\/h4>\n<p>\u811a\u672c\u91cc\u4e0d\u80fd\u7528\u4f1a\u4ea7\u751f\u968f\u673a\u7ed3\u679c\u7684\u547d\u4ee4&#xff08;\u6bd4\u5982 TIME\u3001RANDOMKEY&#xff09;&#xff0c;\u5426\u5219\u4e3b\u4ece\u590d\u5236\u65f6\u6570\u636e\u4f1a\u4e0d\u4e00\u81f4\u3002<\/p>\n<h4>8.3 \u96c6\u7fa4\u6a21\u5f0f\u4e0b key \u8981\u5728\u540c\u4e00\u4e2a slot<\/h4>\n<p>\u96c6\u7fa4\u6a21\u5f0f\u4e0b&#xff0c;\u811a\u672c\u64cd\u4f5c\u7684\u6240\u6709 key \u5fc5\u987b\u843d\u5728\u540c\u4e00\u4e2a\u54c8\u5e0c\u69fd&#xff08;slot&#xff09;&#xff0c;\u5426\u5219\u62a5\u9519\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8981\u7528 KEYS[] \u4f20\u53c2\u6570\u3002<\/p>\n<hr \/>\n<h3>\u672c\u7bc7\u5c0f\u7ed3<\/h3>\n<ul>\n<li>Lua \u811a\u672c\u8ba9 Redis \u591a\u6761\u547d\u4ee4\u539f\u5b50\u6267\u884c&#xff0c;\u4e2d\u95f4\u4e0d\u4f1a\u88ab\u5176\u4ed6\u8bf7\u6c42\u63d2\u961f<\/li>\n<li>Redis \u4e8b\u52a1\u4e0d\u652f\u6301\u56de\u6eda&#xff0c;Lua \u624d\u662f\u771f\u6b63\u7684\u539f\u5b50\u65b9\u6848<\/li>\n<li>\u7528 redis.call() \u5728\u811a\u672c\u91cc\u8c03 Redis \u547d\u4ee4&#xff0c;KEYS[] \u548c ARGV[] \u4f20\u53c2\u6570&#xff08;\u4e0b\u6807\u4ece1\u5f00\u59cb&#xff09;<\/li>\n<li>\u5206\u5e03\u5f0f\u9501\u91ca\u653e\u3001\u9650\u6d41\u3001\u9632\u8d85\u5356&#xff0c;\u4e09\u5927\u7ecf\u5178\u573a\u666f\u5168\u9760 Lua \u4fdd\u8bc1\u539f\u5b50\u6027<\/li>\n<li>\u811a\u672c\u8981\u77ed&#xff0c;\u522b\u963b\u585e Redis&#xff1b;\u96c6\u7fa4\u4e0b key \u8981\u5728\u4e00\u4e2a slot<\/li>\n<li>\u4e0b\u4e00\u7bc7\u8bb2 Redis \u9ad8\u53ef\u7528&#xff1a;\u4e3b\u4ece\u590d\u5236\u548c\u54e8\u5175\u96c6\u7fa4<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Lua \u811a\u672c\u662f Redis 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