openresty中的lua配置调试递归显示table内容，在连接mysql,redis中可以查看table结构|-|{"files":{"example.txt":{"env":"plain"},"ngx_rPrint.lua":{"env":"plain"}},"tag":"Uncategorized"}

example.txt

res,err,errcode,sqlstate=db:query("select * from user where username='test'")

if next(res) ~=nil then
    rPrint(res,nil,"res----");   
end

res--------table
res---- [1] ----table
res---- [1] [role_id] ----number----1
res---- [1] [username] ----string----jack

ngx_rPrint.lua

function rPrint(s, l, i) -- recursive Print (structure, limit, indent)
	l = (l) or 100; i = i or "";	-- default item limit, indent string
	if (l<1) then ngx.say("ERROR: Item limit reached.<br/>"); return l-1 end;
	local ts = type(s);
	if (ts ~= "table") then ngx.say(i.."----",ts.."----",s,"<br/>"); return l-1 end
	ngx.say(i.."----",ts,"<br/>");           -- print "table"
	for k,v in pairs(s) do  -- print "[KEY] VALUE"
		l = rPrint(v, l, i.." \t ["..tostring(k).."] ");
		if (l < 0) then break end
	end
	return l
end