lua 笔记

mark一下用到的lua的一些语法

lua的数据结构table

test = {"Tom", "Mary", "Jam","Hey"}

lua读取文件

local load_comeback_actor_from_file = function(file_name)
    local file = io.open(file_name)
    for l in file:lines() do
        local key = nil 
        for n in string.gmatch(l,"[+-]?[0-9]*[%.]?[0-9]+[e]?[+]?[-]?[0-9]*") do
            if key == nil then
                key = n 
                -- print("key > " .. key)
            else
                if actor_login_table[key] == nil then
                    actor_login_table[key] = {}
                end
                table.insert(actor_login_table[key],n)
            end
        end
    end
end

-- 打印table
local debug_print_table = function(tblName)
    for i, v in pairs(tblName)
    do
        local key = i
        local key_len = #v    -- 获得table的长度
        print("key > ",key) 
        for index=1, key_len, 1 do
            print(" value -> ", v[index])
        end
    end
end

文件的格式

1243274972130967574 1552233600 1552320000

执行之后的结果
key = 1243274972130967574 
value = {1552233600, 1552320000}

lua访问db工具中对应数组的下标的时候

index1 = 5
index2 = 5.0 

array[index1]  -- ok
array[index2]  -- not ok

-- 解决的办法
local new_index = math.floor(index2)
array[new_inde] 

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• 参考

1. lua学习笔记 https://www.kancloud.cn/digest/luanote/119923