連線資料庫

連線資料庫我們需要使用到ngx_lua的第三方庫：

這兩個庫都是基於cosocket實現的，特點是非同步非阻塞。**風格是同步的寫法。更多第三方庫詳見：see also 。

example拷貝官網：

server 

local ok, err, errcode, sqlstate = db:connect
if not ok then
ngx.say("failed to connect: ", err, ": ", errcode, " ", sqlstate)
return
endngx.say("connected to mysql.")
local res, err, errcode, sqlstate =
db:query("drop table if exists cats")
if not res then
ngx.say("bad result: ", err, ": ", errcode, ": ", sqlstate, ".")
return
endres, err, errcode, sqlstate =
db:query("create table cats "
.. "(id serial primary key, "
.. "name varchar(5))")
if not res then
ngx.say("bad result: ", err, ": ", errcode, ": ", sqlstate, ".")
return
endngx.say("table cats created.")
res, err, errcode, sqlstate =
db:query("insert into cats (name) "
.. "values (\'bob\'),(\'\'),(null)")
if not res then
ngx.say("bad result: ", err, ": ", errcode, ": ", sqlstate, ".")
return
endngx.say(res.affected_rows, " rows inserted into table cats ",
"(last insert id: ", res.insert_id, ")")
-- run a select query, expected about 10 rows in
-- the result set:
res, err, errcode, sqlstate =
db:query("select * from cats order by id asc", 10)
if not res then
ngx.say("bad result: ", err, ": ", errcode, ": ", sqlstate, ".")
return
endlocal cjson = require "cjson"
ngx.say("result: ", cjson.encode(res))
-- put it into the connection pool of size 100,
-- with 10 seconds max idle timeout
local ok, err = db:set_keepalive(10000, 100)
if not ok then
ngx.say("failed to set keepalive: ", err)
return
end-- or just close the connection right away:
-- local ok, err = db:close()
-- if not ok then
--     ngx.say("failed to close: ", err)
--     return
-- end';}
}

server }}

redis-5.0.8/src/redis-server

curl http://localhost:8080/test

參考：redis 介面的二次封裝（簡化建連、拆連等細節） · openresty最佳實踐

增加檔案conf/lua/red.lua

local redis = require "resty.redis_iresty"

local red = redis:new()
local ok, err = red:set("dog", "an animal")
if not ok then
ngx.say("failed to set dog: ", err)
return
endngx.say("set result: ", ok)

location /red

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