我目前正在开发一个缓存,需要为每个调用增加数百个计数器,如下所示:
redis.pipelined do keys.each{ |key| redis.incr key } end
现在,在我的配置文件中,我看到redis gem仍收集了我不需要的答复,并浪费了一些宝贵的时间。我可以通过某种方式告诉Redis我对回复不感兴趣吗?有没有更好的方法来增加很多值。
MINCR例如,我没有找到命令。
MINCR
提前致谢!
是的…至少在2.6中。您可以在LUA脚本中执行此操作,只需让LUA脚本返回空结果即可。这是使用booksleeve客户端的:
const int DB = 0; // any database number // prime some initial values conn.Keys.Remove(DB, new[] {"a", "b", "c"}); conn.Strings.Increment(DB, "b"); conn.Strings.Increment(DB, "c"); conn.Strings.Increment(DB, "c"); // run the script, passing "a", "b", "c", "c" to // increment a & b by 1, c twice var result = conn.Scripting.Eval(DB, @"for i,key in ipairs(KEYS) do redis.call('incr', key) end", new[] { "a", "b", "c", "c"}, // <== aka "KEYS" in the script null); // <== aka "ARGV" in the script // check the incremented values var a = conn.Strings.GetInt64(DB, "a"); var b = conn.Strings.GetInt64(DB, "b"); var c = conn.Strings.GetInt64(DB, "c"); Assert.IsNull(conn.Wait(result), "result"); Assert.AreEqual(1, conn.Wait(a), "a"); Assert.AreEqual(2, conn.Wait(b), "b"); Assert.AreEqual(4, conn.Wait(c), "c");
或incrby通过将“ by”数字作为参数传递来做同样的事情,将中间部分更改为:
incrby
// run the script, passing "a", "b", "c" and 1, 1, 2 // increment a & b by 1, c twice var result = conn.Scripting.Eval(DB, @"for i,key in ipairs(KEYS) do redis.call('incrby', key, ARGV[i]) end", new[] { "a", "b", "c" }, // <== aka "KEYS" in the script new object[] { 1, 1, 2 }); // <== aka "ARGV" in the script