\u591a\u53f0\u7535\u8111\u8bfb\u53d6REDIS\u670d\u52a1\u5668，\u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u4e0d\u4f1a\u51b2\u7a81？\u6bd4\u5982\u8fd9\u53f0\u6263\u4e8610\u5143，\u53e6\u4e00\u53f0\u6253\u5f00\u4e5f\u8981\u6263\u94b1，\u7528\u539f\u5b50\u7b97\u6cd5\u80af\u5b9a\u4e0d\u4f1a\u6263\u9519\u5427？<\/p>\n
\u5df2\u5b8c\u6210\u601d\u8003<\/p>\n
\u4f60\u95ee\u5230\u4e86 Redis \u591a\u5b9e\u4f8b\u5e76\u53d1\u7684\u6838\u5fc3\u573a\u666f！\u5148\u7ed9100% \u786e\u5b9a\u7684\u7ed3\u8bba：<\/p>\n
\u6838\u5fc3\u539f\u56e0\u662f Redis \u7684\u300c\u5355\u7ebf\u7a0b\u6a21\u578b\u300d+\u300c\u539f\u5b50\u547d\u4ee4 \/ \u811a\u672c\u300d\u673a\u5236，\u6211\u5e2e\u4f60\u628a\u8fd9\u4e2a\u903b\u8f91\u8bb2\u900f，\u518d\u7ed9\u4f60\u53ef\u76f4\u63a5\u843d\u5730\u7684\u00a0VB.NET\u00a0\u4ee3\u7801\u3002<\/p>\n
Redis \u670d\u52a1\u7aef\u662f\u5355\u7ebf\u7a0b\u5904\u7406\u547d\u4ee4\u7684 \u2014\u2014 \u4e0d\u7ba1\u6709\u591a\u5c11\u53f0\u7535\u8111（\u591a\u5b9e\u4f8b）\u540c\u65f6\u8fde Redis，\u670d\u52a1\u7aef\u90fd\u4f1a\u300c\u6309\u987a\u5e8f\u4e00\u4e2a\u4e00\u4e2a\u6267\u884c\u547d\u4ee4\u300d，\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u547d\u4ee4\u5728\u6267\u884c，\u4e0d\u4f1a\u6709\u5e76\u53d1\u6253\u65ad\u7684\u95ee\u9898\u3002<\/p>\n
\u8fd9\u662f Redis \u539f\u5b50\u6027\u7684\u57fa\u7840：\u5355\u547d\u4ee4\u5929\u7136\u539f\u5b50，\u591a\u6b65\u64cd\u4f5c\u53ea\u8981\u5c01\u88c5\u6210\u5355\u547d\u4ee4 \/ \u811a\u672c\u4e5f\u80fd\u539f\u5b50\u3002<\/p>\n
\u5982\u679c\u4f60\u7684\u903b\u8f91\u662f\u300c\u4e0d\u7ba1\u4f59\u989d\u591a\u5c11，\u76f4\u63a5\u6263 10 \u5143\u300d（\u6216\u4f59\u989d\u8db3\u591f\u7684\u524d\u63d0\u4e0b\u76f4\u63a5\u6263），\u7528 Redis \u539f\u5b50\u547d\u4ee4\u00a0DecrBy（\u6216\u00a0IncrBy -10）\u5373\u53ef，\u591a\u5b9e\u4f8b\u540c\u65f6\u8c03\u7528\u4e5f\u4e0d\u4f1a\u6263\u9519\u3002<\/p>\n
vb<\/p>\n
Imports CSRedis<\/p>\n
Public Class AccountService
\n Private Shared _redisClient As New CSRedisClient("127.0.0.1:6379,password=cd@JD34,defaultDatabase=0")<\/p>\n
''' <summary>
\n ''' \u76f4\u63a5\u6263\u94b1（\u539f\u5b50\u64cd\u4f5c，\u591a\u5b9e\u4f8b\u7edd\u5bf9\u5b89\u5168）
\n ''' <\/summary>
\n ''' <param name="userId">\u7528\u6237ID<\/param>
\n ''' <param name="amount">\u6263\u94b1\u91d1\u989d（\u6b63\u6570）<\/param>
\n ''' <returns>\u6263\u540e\u7684\u4f59\u989d<\/returns>
\n Public Function DeductMoneyDirect(userId As String, amount As Integer) As Long
\n Dim key = $"account:balance:{userId}"
\n ' \u6838\u5fc3：\u539f\u5b50\u51cf amount（\u7b49\u4ef7\u4e8e DecrBy，\u9002\u914d\u4f4e\u7248\u672c\u7528 IncrBy -amount）
\n Dim newBalance = _redisClient.IncrBy(key, -amount)
\n Return newBalance
\n End Function
\nEnd Class<\/p>\n
' ========== \u591a\u5b9e\u4f8b\u5e76\u53d1\u6d4b\u8bd5（\u6a21\u62df10\u53f0\u7535\u8111\u540c\u65f6\u6263\u94b1） ==========
\nSub Main()
\n Dim service As New AccountService()
\n ' \u521d\u59cb\u5316\u4f59\u989d\u4e3a 1000
\n _redisClient.Set("account:balance:1001", "1000")<\/p>\n
' \u6a21\u62df10\u53f0\u7535\u8111\u540c\u65f6\u626310\u5143
\n Dim tasks As New List(Of Task)
\n For i As Integer = 1 To 10
\n tasks.Add(Task.Run(Sub()
\n Dim balance = service.DeductMoneyDirect("1001", 10)
\n Debug.WriteLine($"\u5b9e\u4f8b{i}\u6263\u94b1\u540e\u4f59\u989d：{balance}")
\n End Sub))
\n Next
\n Task.WaitAll(tasks.ToArray())<\/p>\n
' \u6700\u7ec8\u4f59\u989d\u4e00\u5b9a\u662f 1000 – 10*10 = 900，\u7edd\u5bf9\u4e0d\u4f1a\u9519
\n Dim finalBalance = _redisClient.Get("account:balance:1001")
\n Debug.WriteLine($"\u6700\u7ec8\u4f59\u989d：{finalBalance}") ' \u8f93\u51fa：900
\nEnd Sub<\/p>\n
\u5982\u679c\u4f60\u7684\u903b\u8f91\u662f\u300c\u5148\u8bfb\u4f59\u989d，\u5224\u65ad\u226510 \u5143\u624d\u6263\u94b1，\u5426\u5219\u63d0\u793a\u4f59\u989d\u4e0d\u8db3\u300d，\u8fd9\u662f\u591a\u6b65\u64cd\u4f5c，\u5355\u547d\u4ee4\u539f\u5b50\u6027\u4e0d\u591f（\u56e0\u4e3a\u300c\u8bfb\u300d\u548c\u300c\u6263\u300d\u4e4b\u95f4\u53ef\u80fd\u88ab\u5176\u4ed6\u5b9e\u4f8b\u6253\u65ad），\u9700\u8981\u7528\u00a0Lua \u811a\u672c\u00a0\u628a\u591a\u6b65\u5c01\u88c5\u6210\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n
\u5047\u8bbe\u521d\u59cb\u4f59\u989d\u662f 15 \u5143，\u4e24\u53f0\u7535\u8111\u540c\u65f6\u6263 10 \u5143：<\/p>\n
Redis \u6267\u884c Lua \u811a\u672c\u662f\u539f\u5b50\u7684\u2014\u2014 \u811a\u672c\u6267\u884c\u671f\u95f4\u4e0d\u4f1a\u88ab\u5176\u4ed6\u547d\u4ee4\u6253\u65ad，\u76f8\u5f53\u4e8e\u628a\u300c\u8bfb\u2192\u5224\u65ad\u2192\u6263\u300d\u53d8\u6210\u4e86\u4e00\u4e2a\u5355\u547d\u4ee4\u3002<\/p>\n
vb<\/p>\n
Imports CSRedis
\nImports System.Collections.Generic<\/p>\n
Public Class AccountService
\n Private Shared _redisClient As New CSRedisClient("127.0.0.1:6379,password=cd@JD34,defaultDatabase=0")<\/p>\n
''' <summary>
\n ''' \u5148\u5224\u65ad\u4f59\u989d\u518d\u6263\u94b1（Lua \u811a\u672c\u539f\u5b50\u64cd\u4f5c，\u591a\u5b9e\u4f8b\u7edd\u5bf9\u5b89\u5168）
\n ''' <\/summary>
\n ''' <param name="userId">\u7528\u6237ID<\/param>
\n ''' <param name="amount">\u6263\u94b1\u91d1\u989d（\u6b63\u6570）<\/param>
\n ''' <returns>\u6263\u540e\u7684\u4f59\u989d（\u8d1f\u6570\u8868\u793a\u4f59\u989d\u4e0d\u8db3）<\/returns>
\n Public Function DeductMoneyWithCheck(userId As String, amount As Integer) As Long
\n Dim key = $"account:balance:{userId}"<\/p>\n
' Lua \u811a\u672c：\u539f\u5b50\u6267\u884c\u300c\u8bfb\u4f59\u989d\u2192\u5224\u65ad\u2192\u6263\u94b1\u300d
\n ' \u903b\u8f91：1. \u8bfb\u4f59\u989d；2. \u82e5\u4f59\u989d<amount，\u8fd4\u56de-1；3. \u5426\u5219\u6263\u94b1\u5e76\u8fd4\u56de\u65b0\u4f59\u989d
\n Dim luaScript = "
\n local balance = tonumber(redis.call('GET', KEYS[1]))
\n if balance == nil then
\n return -2 — \u8d26\u6237\u4e0d\u5b58\u5728
\n end
\n if balance < tonumber(ARGV[1]) then
\n return -1 — \u4f59\u989d\u4e0d\u8db3
\n end
\n return redis.call('INCRBY', KEYS[1], -tonumber(ARGV[1])) — \u6263\u94b1
\n "<\/p>\n
' \u6267\u884c Lua \u811a\u672c（\u539f\u5b50\u64cd\u4f5c）
\n ' KEYS[1] = \u4f59\u989dKey，ARGV[1] = \u6263\u94b1\u91d1\u989d
\n Dim result = _redisClient.Eval(luaScript, New List(Of String) From {key}, amount.ToString())
\n Return CLng(result)
\n End Function
\nEnd Class<\/p>\n
' ========== \u591a\u5b9e\u4f8b\u5e76\u53d1\u6d4b\u8bd5（\u6a21\u62df10\u53f0\u7535\u8111\u540c\u65f6\u6263\u94b1，\u4f59\u989d15\u5143） ==========
\nSub Main()
\n Dim service As New AccountService()
\n ' \u521d\u59cb\u5316\u4f59\u989d\u4e3a 15 \u5143
\n _redisClient.Set("account:balance:1001", "15")<\/p>\n
' \u6a21\u62df10\u53f0\u7535\u8111\u540c\u65f6\u626310\u5143
\n Dim tasks As New List(Of Task)
\n For i As Integer = 1 To 10
\n tasks.Add(Task.Run(Sub()
\n Dim result = service.DeductMoneyWithCheck("1001", 10)
\n If result >= 0 Then
\n Debug.WriteLine($"\u5b9e\u4f8b{i}\u6263\u94b1\u6210\u529f，\u4f59\u989d：{result}")
\n ElseIf result = -1 Then
\n Debug.WriteLine($"\u5b9e\u4f8b{i}\u6263\u94b1\u5931\u8d25：\u4f59\u989d\u4e0d\u8db3")
\n ElseIf result = -2 Then
\n Debug.WriteLine($"\u5b9e\u4f8b{i}\u6263\u94b1\u5931\u8d25：\u8d26\u6237\u4e0d\u5b58\u5728")
\n End If
\n End Sub))
\n Next
\n Task.WaitAll(tasks.ToArray())<\/p>\n
' \u6700\u7ec8\u7ed3\u679c：\u53ea\u67091\u53f0\u7535\u8111\u80fd\u6263\u6210\u529f，\u4f59\u989d\u53d8\u62105\u5143，\u5176\u4ed69\u53f0\u63d0\u793a\u4f59\u989d\u4e0d\u8db3，\u7edd\u5bf9\u4e0d\u4f1a\u8d85\u6263
\n Dim finalBalance = _redisClient.Get("account:balance:1001")
\n Debug.WriteLine($"\u6700\u7ec8\u4f59\u989d：{finalBalance}") ' \u8f93\u51fa：5
\nEnd Sub<\/p>\n
\u4e0d\u8981\u7528\u5ba2\u6237\u7aef\u9501（\u5982\u00a0VB.NET\u00a0\u7684 SyncLock）：SyncLock \u53ea\u80fd\u9501\u4f4f\u300c\u5f53\u524d\u7535\u8111\u7684\u5f53\u524d\u8fdb\u7a0b\u300d，\u591a\u53f0\u7535\u8111\u4e4b\u95f4\u5b8c\u5168\u6ca1\u7528，\u5fc5\u987b\u7528 Redis \u670d\u52a1\u7aef\u7684\u539f\u5b50\u64cd\u4f5c \/ Lua \u811a\u672c \/ \u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<\/li>\n
\u4e0d\u8981\u628a\u300c\u8bfb\u300d\u548c\u300c\u6263\u300d\u5206\u6210\u4e24\u4e2a\u547d\u4ee4：\u6bd4\u5982\u5148\u00a0Get balance\u00a0\u518d\u00a0DecrBy balance 10，\u4e2d\u95f4\u4f1a\u88ab\u5176\u4ed6\u5b9e\u4f8b\u6253\u65ad，\u5bfc\u81f4\u8d85\u6263，\u5fc5\u987b\u7528 Lua \u811a\u672c\u5c01\u88c5\u6210\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
Lua \u811a\u672c\u4e0d\u8981\u5199\u592a\u590d\u6742\u7684\u903b\u8f91：Redis \u6267\u884c Lua \u811a\u672c\u65f6\u4f1a\u963b\u585e\u5176\u4ed6\u547d\u4ee4，\u6240\u4ee5\u811a\u672c\u8981\u5c3d\u91cf\u77ed\u5e73\u5feb，\u53ea\u653e\u300c\u8bfb\u2192\u5224\u65ad\u2192\u6263\u300d\u7684\u6838\u5fc3\u903b\u8f91\u3002<\/p>\n<\/li>\n
\u8fd9\u5957\u65b9\u6848\u662f Redis \u591a\u5b9e\u4f8b\u5e76\u53d1\u6263\u94b1\u7684\u300c\u5de5\u4e1a\u7ea7\u6807\u51c6\u5199\u6cd5\u300d，\u4e0d\u7ba1\u6709\u591a\u5c11\u53f0\u7535\u8111\u540c\u65f6\u64cd\u4f5c，\u90fd\u80fd\u4fdd\u8bc1\u6570\u636e 100% \u6b63\u786e，\u4f60\u53ef\u4ee5\u76f4\u63a5\u843d\u5730\u4f7f\u7528\u3002<\/p>\n<\/p>\n
\u300c\u8bfb\u300d\u548c\u300c\u6263\u300d\u8981\u7528LUA\u811a\u672c\u53bb\u64cd\u4f5c\u5c31\u53d8\u590d\u6742\u4e86\u3002\u5982\u679c\u589e\u52a0\u50cf\u662fSQL\u53e5\u5b50\u4e00\u6837\u7684， MONEY=MOEY-10 WHERE MONEY>10 \u540c\u65f6\u8fd4\u56deMOMEY\u4f59\u989d，\u4e00\u53e5\u8bdd\u5b9e\u73b0，\u6216\u8005\u6709\u4e2aSQL\u53e5\u5b50\u4e2d\u7684\u9501，\u591a\u4e2aSQL\u53e5\u5b50\u6267\u884c\u5b8c\u4e86\u518d\u89e3\u9501 \u6bd4\u5982decrbyCheck(key,-amount,money-amount>10) \u4ee3\u8868\u6263\u6b3e\u540e\u4f59\u989d\u8981\u5927\u4e8e10\u7684\u624d\u80fd\u64cd\u4f5c，\u6700\u5c11\u4e5f\u8981\u6ee1\u8db3 money>=amount \u5176\u5b9eredis\u4e2d\u589e\u52a0\u4e00\u4e2a\u8fd9\u6837\u7684\u63a5\u53e3\u4e0d\u96be\u5440，\u4e3a\u4ec0\u4e48\u4e0d\u505a？<\/p>\n
\u5df2\u5b8c\u6210\u601d\u8003<\/p>\n
\u53d1\u73b0\u7528\u6237\u5bf9 Redis \u4e0d\u63d0\u4f9b\u7c7b\u4f3c SQL \u7684\u6761\u4ef6\u539f\u5b50\u64cd\u4f5c\u63a5\u53e3\u4e0d\u6ee1，\u89c9\u5f97 Lua\u00a0\u811a\u672c\u590d\u6742\u3002\u6211\u5224\u65ad\u7528\u6237\u6838\u5fc3\u8bc9\u6c42\u662f\u5e0c\u671b\u6709\u66f4\u7b80\u5355\u7684\u3001\u7c7b\u4f3c SQL \u7684\u6761\u4ef6\u539f\u5b50\u64cd\u4f5c，\u65e0\u9700\u7f16\u5199 Lua\u00a0\u811a\u672c\u3002<\/p>\n
\u5df2\u5b8c\u6210<\/p>\n
\u4f60\u7684\u60f3\u6cd5\u975e\u5e38\u76f4\u89c2！\u5176\u5b9e Redis \u4e0d\u662f\u300c\u505a\u4e0d\u5230\u300d，\u800c\u662f\u8bbe\u8ba1\u54f2\u5b66\u4e0a\u9009\u62e9\u4e86\u300c\u63d0\u4f9b\u901a\u7528\u673a\u5236（Lua \u811a\u672c \/ Redis Functions），\u800c\u975e\u65e0\u9650\u589e\u52a0\u7279\u5b9a\u573a\u666f\u547d\u4ee4\u300d\u2014\u2014 \u800c\u4e14\u4f60\u60f3\u8981\u7684\u300c\u6761\u4ef6\u6263\u94b1 + \u8fd4\u56de\u4f59\u989d\u300d，\u7528 Lua \u811a\u672c\u5c01\u88c5\u6210\u901a\u7528\u65b9\u6cd5\u540e，\u8c03\u7528\u8d77\u6765\u548c\u539f\u751f\u547d\u4ee4\u4e00\u6837\u7b80\u5355，\u6211\u5e2e\u4f60\u628a\u8fd9\u4e2a\u903b\u8f91\u8bb2\u900f，\u518d\u7ed9\u4f60\u4e00\u4e2a\u300c\u4e00\u884c\u4ee3\u7801\u8c03\u7528\u300d\u7684\u5c01\u88c5\u65b9\u6848\u3002<\/p>\n
Redis \u7684\u6838\u5fc3\u8bbe\u8ba1\u54f2\u5b66\u662f\u300c\u4fdd\u6301\u7b80\u5355\u3001\u901a\u7528，\u907f\u514d\u547d\u4ee4\u96c6\u7206\u70b8\u300d：<\/p>\n
\u4f60\u4e0d\u9700\u8981\u6bcf\u6b21\u90fd\u5199 Lua \u811a\u672c，\u53ea\u9700\u8981\u5c01\u88c5\u4e00\u6b21，\u540e\u7eed\u8c03\u7528\u5c31\u50cf\u00a0DecrByCheck(key, amount, minBalance)\u00a0\u4e00\u6837\u7b80\u5355，\u6211\u5e2e\u4f60\u5199\u597d\u53ef\u76f4\u63a5\u590d\u7528\u7684\u00a0VB.NET\u00a0\u4ee3\u7801：<\/p>\n
vb<\/p>\n
Imports CSRedis
\nImports System.Collections.Generic<\/p>\n
Public Class RedisAtomicHelper
\n Private Shared _redisClient As New CSRedisClient("127.0.0.1:6379,password=cd@JD34,defaultDatabase=0")<\/p>\n
''' <summary>
\n ''' \u901a\u7528\u6761\u4ef6\u6263\u94b1\u65b9\u6cd5（\u5c01\u88c5 Lua \u811a\u672c，\u8c03\u7528\u8d77\u6765\u548c\u539f\u751f\u547d\u4ee4\u4e00\u6837\u7b80\u5355）
\n ''' \u7b49\u4ef7\u4e8e：MONEY = MONEY – amount WHERE MONEY >= minBalance，\u540c\u65f6\u8fd4\u56de\u6263\u540e\u4f59\u989d
\n ''' <\/summary>
\n ''' <param name="key">\u4f59\u989d Key<\/param>
\n ''' <param name="amount">\u6263\u94b1\u91d1\u989d（\u6b63\u6570）<\/param>
\n ''' <param name="minBalance">\u6263\u94b1\u524d\/\u540e\u9700\u6ee1\u8db3\u7684\u6700\u4f4e\u4f59\u989d（\u6bd4\u5982 amount \u8868\u793a\u6263\u524d\u591f\u6263，10 \u8868\u793a\u6263\u540e\u226510）<\/param>
\n ''' <param name="checkBeforeDeduct">true=\u68c0\u67e5\u6263\u524d\u4f59\u989d\u2265minBalance；false=\u68c0\u67e5\u6263\u540e\u4f59\u989d\u2265minBalance<\/param>
\n ''' <returns>\u22650：\u6263\u540e\u4f59\u989d；-1：\u4f59\u989d\u4e0d\u8db3；-2：Key\u4e0d\u5b58\u5728<\/returns>
\n Public Function DecrByCheck(key As String, amount As Integer, minBalance As Integer, Optional checkBeforeDeduct As Boolean = True) As Long
\n ' \u53ea\u9700\u8981\u5199\u4e00\u6b21 Lua \u811a\u672c，\u540e\u7eed\u6c38\u8fdc\u590d\u7528
\n Dim luaScript = "
\n local current = tonumber(redis.call('GET', KEYS[1]))
\n if current == nil then
\n return -2 — Key \u4e0d\u5b58\u5728
\n end
\n local amount = tonumber(ARGV[1])
\n local min = tonumber(ARGV[2])
\n local checkBefore = tonumber(ARGV[3]) == 1<\/p>\n
if checkBefore then
\n — \u68c0\u67e5\u6263\u524d\u4f59\u989d：current >= min（min \u4e00\u822c\u7b49\u4e8e amount）
\n if current < min then
\n return -1
\n end
\n else
\n — \u68c0\u67e5\u6263\u540e\u4f59\u989d：current – amount >= min
\n if current – amount < min then
\n return -1
\n end
\n end<\/p>\n
— \u6267\u884c\u6263\u94b1\u5e76\u8fd4\u56de\u65b0\u4f59\u989d
\n return redis.call('INCRBY', KEYS[1], -amount)
\n "<\/p>\n
' \u6267\u884c\u811a\u672c（\u53c2\u6570：KEYS[1]=key，ARGV[1]=amount，ARGV[2]=minBalance，ARGV[3]=checkBeforeDeduct）
\n Dim result = _redisClient.Eval(
\n luaScript,
\n New List(Of String) From {key},
\n amount.ToString(),
\n minBalance.ToString(),
\n If(checkBeforeDeduct, "1", "0")
\n )
\n Return CLng(result)
\n End Function
\nEnd Class<\/p>\n
' ========== \u8c03\u7528\u793a\u4f8b（\u4e00\u884c\u4ee3\u7801，\u548c\u539f\u751f\u547d\u4ee4\u4e00\u6837\u7b80\u5355） ==========
\nSub Main()
\n Dim helper As New RedisAtomicHelper()
\n Dim key = "account:balance:1001"<\/p>\n
' \u521d\u59cb\u5316\u4f59\u989d\u4e3a 100
\n _redisClient.Set(key, "100")<\/p>\n
' \u573a\u666f1：\u626310\u5143，\u8981\u6c42\u6263\u524d\u4f59\u989d\u226510（\u6700\u5e38\u7528，\u7b49\u4ef7\u4e8e MONEY = MONEY-10 WHERE MONEY>=10）
\n Dim result1 = helper.DecrByCheck(key, 10, 10, True)
\n If result1 >= 0 Then
\n Debug.WriteLine($"\u573a\u666f1\u6263\u94b1\u6210\u529f，\u4f59\u989d：{result1}") ' \u8f93\u51fa：90
\n End If<\/p>\n
' \u573a\u666f2：\u626310\u5143，\u8981\u6c42\u6263\u540e\u4f59\u989d\u226585（\u7b49\u4ef7\u4e8e MONEY = MONEY-10 WHERE MONEY-10>=85）
\n Dim result2 = helper.DecrByCheck(key, 10, 85, False)
\n If result2 >= 0 Then
\n Debug.WriteLine($"\u573a\u666f2\u6263\u94b1\u6210\u529f，\u4f59\u989d：{result2}") ' \u8f93\u51fa：80
\n End If<\/p>\n
' \u573a\u666f3：\u6263100\u5143，\u4f59\u989d\u4e0d\u8db3（\u8fd4\u56de-1）
\n Dim result3 = helper.DecrByCheck(key, 100, 100, True)
\n If result3 = -1 Then
\n Debug.WriteLine($"\u573a\u666f3\u6263\u94b1\u5931\u8d25：\u4f59\u989d\u4e0d\u8db3")
\n End If
\nEnd Sub<\/p>\n
\u5982\u679c\u4f60\u7528\u7684\u662f Redis 7.0+，\u53ef\u4ee5\u7528\u00a0Redis Functions\u00a0\u628a\u81ea\u5b9a\u4e49\u903b\u8f91\u9884\u52a0\u8f7d\u5230 Redis \u670d\u52a1\u7aef，\u540e\u7eed\u8c03\u7528\u5c31\u548c\u539f\u751f\u547d\u4ee4\u4e00\u6a21\u4e00\u6837，\u8fde Lua \u811a\u672c\u90fd\u4e0d\u7528\u5728\u5ba2\u6237\u7aef\u5199\u4e86：<\/p>\n
bash<\/p>\n
\u8fd0\u884c<\/p>\n
# \u5728 redis-cli \u4e2d\u6267\u884c，\u9884\u52a0\u8f7d\u4e00\u4e2a\u540d\u4e3a deduct_check \u7684\u51fd\u6570
\nredis-cli -a cd@JD34
\n> FUNCTION LOAD "#!lua name=deduct_check
\nlocal function deduct_check(keys, args)
\n local current = tonumber(redis.call('GET', keys[1]))
\n if current == nil then return -2 end
\n local amount = tonumber(args[1])
\n local min = tonumber(args[2])
\n if current < min then return -1 end
\n return redis.call('INCRBY', keys[1], -amount)
\nend
\nredis.register_function('deduct_check', deduct_check)"<\/p>\n
vb<\/p>\n
' \u8c03\u7528\u9884\u52a0\u8f7d\u7684 Function，\u5c31\u50cf\u8c03\u7528\u539f\u751f DecrBy \u4e00\u6837\u7b80\u5355
\nDim result = _redisClient.Call("FCALL", "deduct_check", "1", key, amount.ToString(), minBalance.ToString())<\/p>\n
\u5176\u5b9e\u4f60\u60f3\u8981\u7684\u300cSQL \u5f0f\u6761\u4ef6\u64cd\u4f5c\u300d，Redis \u5df2\u7ecf\u901a\u8fc7 Lua \u811a\u672c \/ Redis Functions \u63d0\u4f9b\u4e86，\u53ea\u662f\u9700\u8981\u4f60\u5c01\u88c5\u4e00\u6b21，\u540e\u7eed\u5c31\u53ef\u4ee5\u50cf\u7528\u539f\u751f\u547d\u4ee4\u4e00\u6837\u7b80\u5355，\u800c\u4e14\u66f4\u7075\u6d3b \u2014\u2014 \u8fd9\u4e2a\u65b9\u6848\u662f Redis \u751f\u6001\u4e2d\u5904\u7406\u300c\u81ea\u5b9a\u4e49\u6761\u4ef6\u539f\u5b50\u64cd\u4f5c\u300d\u7684\u6807\u51c6\u505a\u6cd5，\u4f60\u53ef\u4ee5\u76f4\u63a5\u843d\u5730\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u591a\u53f0\u7535\u8111\u8bfb\u53d6REDIS\u670d\u52a1\u5668，\u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u4e0d\u4f1a\u51b2\u7a81？\u6bd4\u5982\u8fd9\u53f0\u6263\u4e8610\u5143，\u53e6\u4e00\u53f0\u6253\u5f00\u4e5f\u8981\u6263\u94b1，\u7528\u539f\u5b50\u7b97\u6cd5\u80af\u5b9a\u4e0d\u4f1a\u6263\u9519\u5427？
\n\u5df2\u5b8c\u6210\u601d\u8003
\n\u4f60\u95ee\u5230\u4e86 Redis \u591a\u5b9e\u4f8b\u5e76\u53d1\u7684\u6838\u5fc3\u573a\u666f！\u5148\u7ed9100% \u786e\u5b9a\u7684\u7ed3\u8bba：
\n\u5982\u679c\u662f\u300c\u76f4\u63a5\u6263\u94b1\u300d（\u5355\u547d\u4ee4\u64cd\u4f5c，\u5982\u00a0DecrBy balance 10），\u7528 Redis \u539f\u5b50\u64cd\u4f5c\u7edd\u5bf9\u4e0d\u4f1a\u6263\u9519&#x<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[566,567,105,87],"topic":[],"class_list":["post-76693","post","type-post","status-publish","format-standard","hentry","category-server","tag-bootstrap","tag-html","tag-redis","tag-87"],"yoast_head":"\n