Redis\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5185\u5b58\u6570\u636e\u5e93\uff0c\u5e38\u7528\u4e8e\u7f13\u5b58\u548c\u6d88\u606f\u961f\u5217\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u5b83\u8fd8\u652f\u6301\u811a\u672c\u8bed\u8a00Lua\u7684\u7f16\u5199\u548c\u6267\u884c\u3002\u5728Redis\u4e2d\uff0c\u4f7f\u7528Lua\u811a\u672c\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e9b\u81ea\u52a8\u5316\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u5b9a\u65f6\u4efb\u52a1\u3001\u76d1\u63a7\u7b49\u3002<\/p>\n<\/p>\n
Lua\u811a\u672c\u7684\u8fd0\u884c\u65b9\u5f0f\u7c7b\u4f3c\u4e8e\u51fd\u6570\u8c03\u7528\u3002\u9700\u8981\u5c06\u811a\u672c\u4ee3\u7801\u5b58\u5165Redis\u6570\u636e\u5e93\u4e2d\uff0c\u7136\u540e\u901a\u8fc7\u7279\u5b9a\u7684\u547d\u4ee4\u8c03\u7528\u811a\u672c\u5e76\u4f20\u5165\u53c2\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684Lua\u811a\u672c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
\u201c`lua<\/p>\n
local key1 = KEYS[1]<\/p>\n
local key2 = KEYS[2]<\/p>\n
local value1 = ARGV[1]<\/p>\n
local value2 = ARGV[2]<\/p>\n<\/p>\n
redis.call(\u2018SET\u2019, key1, value1)<\/p>\n
redis.call(\u2018SET\u2019, key2, value2)<\/p>\n
\u8be5\u811a\u672c\u901a\u8fc7\u63a5\u6536\u4e24\u4e2a\u952e\u548c\u4e24\u4e2a\u503c\u4f5c\u4e3a\u53c2\u6570\uff0c\u5c06\u8fd9\u4e24\u7ec4\u952e\u503c\u5b58\u5165Redis\u6570\u636e\u5e93\u4e2d\u3002
\u5728Redis\u4e2d\u8c03\u7528\u8be5\u811a\u672c\u7684\u65b9\u5f0f\u662f\u4f7f\u7528`EVAL`\u547d\u4ee4\u3002\u8be5\u547d\u4ee4\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a
```redis
EVAL script numkeys key [key ...] arg [arg ...]
<\/pre>\n<\/p>\n\u5176\u4e2d\uff0c`script`\u4e3a\u5f85\u6267\u884c\u7684Lua\u811a\u672c\uff0c`numkeys`\u5219\u8868\u793a\u63a5\u4e0b\u6765\u7684\u952e\u503c\u5bf9\u6570\u91cf\uff0c`key`\u5219\u4ee3\u8868\u9700\u8981\u4f20\u5165\u7684\u952e\u540d\uff0c`arg`\u8868\u793a\u9700\u8981\u4f20\u5165\u7684\u952e\u503c\u3002\u4ee5\u524d\u9762\u7684\u793a\u4f8b\u4e3a\u4f8b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u8c03\u7528\u8be5\u811a\u672c\uff1a<\/p>\n<\/p>\n
\u201c`redis<\/p>\n
EVAL \u201clocal key1 = KEYS[1]\\nlocal key2 = KEYS[2]\\nlocal value1 = ARGV[1]\\nlocal value2 = ARGV[2]\\n\\nredis.call(\u2018SET\u2019, key1, value1)\\nredis.call(\u2018SET\u2019, key2, value2)\u201d 2 key1 value1 key2 value2<\/p>\n
\u4e0a\u8ff0\u547d\u4ee4\u4e2d\uff0c`2`\u4ee3\u8868\u63a5\u4e0b\u6765\u6709\u4e24\u7ec4\u952e\u503c\u5bf9\u9700\u8981\u4f20\u5165\uff0c`key1`\u548c`key2`\u5219\u5206\u522b\u4ee3\u8868\u4f20\u5165\u7684\u4e24\u4e2a\u952e\u540d\uff0c`value1`\u548c`value2`\u5219\u5206\u522b\u4ee3\u8868\u4f20\u5165\u7684\u4e24\u4e2a\u503c\u3002
\u9664\u4e86\u5e38\u89c4\u7684`SET`\u64cd\u4f5c\uff0cLua\u811a\u672c\u8fd8\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e9b\u9ad8\u7ea7\u7684\u81ea\u52a8\u5316\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528Lua\u811a\u672c\u5b9e\u73b0\u5b9a\u65f6\u4efb\u52a1\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b9e\u73b0\u6bcf\u79d2\u949f\u81ea\u589e1\u7684\u8ba1\u6570\u5668\u7684Lua\u811a\u672c\u793a\u4f8b\uff1a
```lua
local currentValue = tonumber(redis.call('GET', KEYS[1])) or 0
local newValue = currentValue + 1
redis.call('SET', KEYS[1], newValue)
return newValue
<\/pre>\n<\/p>\n\u8be5\u811a\u672c\u4e2d\uff0c\u9996\u5148\u4f7f\u7528`GET`\u64cd\u4f5c\u83b7\u53d6\u5f53\u524d\u8ba1\u6570\u5668\u7684\u503c\uff0c\u7136\u540e\u5c06\u8be5\u503c\u81ea\u589e1\uff0c\u5e76\u4f7f\u7528`SET`\u64cd\u4f5c\u5c06\u65b0\u503c\u5b58\u5165Redis\u6570\u636e\u5e93\u3002\u811a\u672c\u8fd4\u56de\u65b0\u7684\u8ba1\u6570\u5668\u503c\u3002<\/p>\n<\/p>\n
\u5728Redis\u4e2d\u8c03\u7528\u8be5\u811a\u672c\u7684\u65b9\u5f0f\u4e0e\u524d\u9762\u7684\u793a\u4f8b\u76f8\u4f3c\uff0c\u53ea\u9700\u5728\u547d\u4ee4\u4e2d\u4f20\u5165\u8ba1\u6570\u5668\u7684\u952e\u540d\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u547d\u4ee4\u5c06\u6bcf\u79d2\u949f\u81ea\u589e1\u7684\u8ba1\u6570\u5668\u5b58\u5165\u540d\u4e3a`counter`\u7684\u952e\u4e2d\uff1a<\/p>\n<\/p>\n
\u201c`redis<\/p>\n
EVAL \u201clocal currentValue = tonumber(redis.call(\u2018GET\u2019, KEYS[1])) or 0\\nlocal newValue = currentValue + 1\\n\\nredis.call(\u2018SET\u2019, KEYS[1], newValue)\\n\\nreturn newValue\u201d 1 counter<\/p>\n
\u4ee5\u4e0a\u662f\u4f7f\u7528Lua\u811a\u672c\u5b9e\u73b0\u81ea\u52a8\u5316\u64cd\u4f5c\u7684\u57fa\u672c\u6b65\u9aa4\u548c\u793a\u4f8b\u3002\u901a\u8fc7\u6df1\u5165\u5b66\u4e60Lua\u8bed\u8a00\u548cRedis\u547d\u4ee4\u7684\u4f7f\u7528\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5229\u7528\u8fd9\u4e00\u7279\u6027\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u548c\u7075\u6d3b\u7684\u81ea\u52a8\u5316\u64cd\u4f5c\u3002
<\/pre>\n