Lua：在两个特定列上迭代表（带有字母数字值）

debugcn 发表于 Dev

罗杰

我有这段代码可以迭代Lua表“ childrenTable”以检索其值，但是我希望它们按“ symbolicname” 列然后按“ name”列排序

本示例中的表内容已插入，但是在我的实际情况下，它们会自动填充，因此我无法控制它们在表中的获取方式。我将在这里插入内容只是为了填充表格：


    local JSON = require 'dkjson'

    local childrenTable = {}
    
    childrenTable[1] = {symbolicname = "02 CONNECTOR", path = "system/core/b connector", name = "b connector"}
    childrenTable[2] = {symbolicname = "02 CONNECTOR", path = "system/core/a connector", name = "a connector"}
    childrenTable[3] = {symbolicname = "01 CORE", path = "/system/core/b", name = "b"}

    childrenTable[4] = {symbolicname = "01 CORE", path = "/system/core/a", name = "a"}    
        
    for index,value in ipairs(childrenTable) do print(JSON.encode(value)) end

现在返回此结果：

{"name":"b connector","symbolicname":"02
CONNECTOR","path":"system/core/b connector"}

{"name":"a connector","symbolicname":"02
CONNECTOR","path":"system/core/a connector"}

{"name":"b","symbolicname":"01 CORE","path":"/system/core/b"}

{"name":"a","symbolicname":"01 CORE","path":"/system/core/a"}

但我希望它按顺序返回列表：

{"name":"a","symbolicname":"01 CORE","path":"/system/core/a"}

{"name":"b","symbolicname":"01 CORE","path":"/system/core/b"}

{"name":"a connector","symbolicname":"02
CONNECTOR","path":"system/core/a connector"}

{"name":"b connector","symbolicname":"02
CONNECTOR","path":"system/core/b connector"}

提前致谢，

罗杰

煤炭

使用table.sort函数，它将遍历表并在当前索引的左侧和右侧向您传递一个项目。（table.sort基于quicksort算法）

这将为您工作：

local childrenTable = {}
childrenTable[1] = {symbolicname = "02 CONNECTOR", path = "system/core/b connector", name = "b connector"}
childrenTable[2] = {symbolicname = "02 CONNECTOR", path = "system/core/a connector", name = "a connector"}
childrenTable[3] = {symbolicname = "01 CORE", path = "/system/core/b", name = "b"}
childrenTable[4] = {symbolicname = "01 CORE", path = "/system/core/a", name = "a"} 

table.sort(childrenTable, function(a, b)
    if a.symbolicname < b.symbolicname then
        return true
    else
        if a.name < b.name then
            return true
        else return false end
    end
    return false
end)

for k,v in pairs(childrenTable) do print(k, v.name, v.symbolicname) end

另外，对于大量数据，请考虑使用数据框。

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