openresty package.path require 报错

在文件中

package.path = '/usr/local/share/lua/5.1/?.lua;/usr/local/openresty/lualib/resty/?.lua;'
package.cpath = '/usr/local/lib/lua/5.1/?.so;'

执行
local mysql = require "mysql" --正确
local mysql = require "resty.mysql" --报错

去掉

package.path = '/usr/local/share/lua/5.1/?.lua;/usr/local/openresty/lualib/resty/?.lua;' 
package.cpath = '/usr/local/lib/lua/5.1/?.so;'

local mysql = require "mysql" --报错
local mysql = require "resty.mysql" --正确

package.path 的默认路径指向哪的呢？

去掉 package.path，在页面中 随便引用一个不存在的模块 好比 require 'aa'

查看nginx错误日志返回

    no field package.preload['aa']
    no file '/usr/local/openresty/lualib/aa.lua'
    no file '/usr/local/openresty/lualib/aa/init.lua'
    no file './aa.lua'
    no file '/usr/local/openresty/luajit/share/luajit-2.1.0-alpha/aa.lua'
    no file '/usr/local/share/lua/5.1/aa.lua'
    no file '/usr/local/share/lua/5.1/aa/init.lua'
    no file '/usr/local/openresty/luajit/share/lua/5.1/aa.lua'
    no file '/usr/local/openresty/luajit/share/lua/5.1/aa/init.lua'
    no file '/usr/local/openresty/lualib/aa.so'
    no file './aa.so'
    no file '/usr/local/lib/lua/5.1/aa.so'
    no file '/usr/local/openresty/luajit/lib/lua/5.1/aa.so'
    no file '/usr/local/lib/lua/5.1/loadall.so'

发现  /usr/local/openresty/lualib/aa.lua 难道默认的路径是 /usr/local/openresty/lualib 因而在页面中加入

package.path = '/usr/local/share/lua/5.1/?.lua;/usr/local/openresty/lualib/resty/?.lua;/usr/local/openresty/lualib/?.lua;'

package.cpath = '/usr/local/lib/lua/5.1/?.so;'

ngx.say(package.path)

执行正确

新手~~ 勿怪