Lua：在两个特定列上迭代表（带有字母数字值）

Question

我有这段代码迭代 Lua 表“childrenTable”以检索其值，但我希望它们按列 “symbolicname” 排序然后，按列“名称”

• 此示例中的表格内容是插入的，但在我的实际场景中它们是自动填充的，因此我无法控制它们如何进入表格。我将在此处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

现在正在返回这个结果：

{"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

Answer 1

使用table.sort 函数，它将遍历表格并在当前索引的左右翼向您传递一个项目。 （table.sort基于快速排序算法）

这对你有用：

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

此外，对于大量数据，请考虑使用数据框。