Openresty編寫Lua代碼一例

1.前段時間糾結了很久，一直弄不清lua和tomcat的聯系。一直認為是lua調用tomcat的接口才可使用，后面才明白過來，進入了一個誤區，lua本身就是一門獨立的腳本語言。在openresty里面配置好，即可編寫映射和響應。

下面是自己編寫的lua代碼一例，僅供參考。還有些不完善，要開始忙項目了，等有空再繼續更新。

2.下面是lua代碼，記得在nginx.conf寫好配置。

local request_method = ngx.var.request_method
local cjson = require("cjson")
local mysql = require("resty.mysql")
local quote = ngx.quote_sql_str
local db,err = mysql:new()
local function close_db(db)  if not db then  return  end  db:close()  
end 
if not db 
thennax.say("new mysql error",err)
endlocal args = nil
local username = nil
local pwd = nil
if "GET" == request_method
thenargs = ngx.req.get_uri_args()
elseif "POST" == ngx.request_method
thenngx.req.read_body()args = ngx.req.get_post_args()
end
username = tostring(args["username"])
pwd = tostring(args["pwd"])
if username == nil thenngx.say("username not nil")return
elseif username == '' thenngx.say("username not nil")return
elseif pwd == nil thenngx.say("password not nil")return;
elseif pwd == '' thenngx.say("password not nil")return;
enddb:set_timeout(1000)  local props = {  host = "127.0.0.1",  port = 3306,  database = "hwc_hello",  user = "root",  password = "hwc123456"  
}  local res, err, errno, sqlstate = db:connect(props) 
if not res then  ngx.say("connect to mysql error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  return close_db(db)  
end local select_name = "select username from user_table where username="..quote(username)
res, err, errno, sqlstate = db:query(select_name)  
if not res then  ngx.exec("/vi/404.html")  return close_db(db)  
end  
local result = {}
result.success = true;
result.info = "登錄成功"
ngx.say(cjson.encode(result))

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