centos 安裝mysl

Centos系統下安裝mysql，先下載mysql-community-release-el7-5.noarch.rpm，然後通過yum安裝，安裝過程一直確定【Y】即可。

cd /usr/downloads/

wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

rpm -ivh mysql-community-release-el7-5.noarch.rpm

yum install mysql-community-server

安裝成功後，重啟mysql，並進入mysql資料庫，給root使用者設定一個密碼，密碼為“123”。

service mysqld restart

mysql -u root -p

set password for [email protected] = password('123'); 

openresty連線mysql

lua-resty-mysql - Lua MySQL client driver for ngx_lua based on the cosocket API

lua-resty-mysql模組是基於cosocket API 為ngx_lua提供的一個Lua MySQL客戶端。它保證了100%非阻塞。

vim /usr/example/lua/test_mysql.lua，新增以下的程式碼：

local function close_db(db)  
    if not db then  
        return  
    end  
    db:close()  
end  
  
local mysql = require("resty.mysql")  
 
local db, err = mysql:new()  
if not db then  
    ngx.say("new mysql error : ", err)  
    return  
end  

db:set_timeout(1000)  
  
local props = {  
    host = "127.0.0.1",  
    port = 3306,  
    database = "mysql",  
    user = "root",  
    password = "123"  
}  
  
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 drop_table_sql = "drop table if exists test"  
res, err, errno, sqlstate = db:query(drop_table_sql)  
if not res then  
   ngx.say("drop table error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  

local create_table_sql = "create table test(id int primary key auto_increment, ch varchar(100))"  
res, err, errno, sqlstate = db:query(create_table_sql)  
if not res then  
   ngx.say("create table error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  

local insert_sql = "insert into test (ch) values('hello')"  
res, err, errno, sqlstate = db:query(insert_sql)  
if not res then  
   ngx.say("insert error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  
res, err, errno, sqlstate = db:query(insert_sql)  
  
ngx.say("insert rows : ", res.affected_rows, " , id : ", res.insert_id, "<br/>")  
  
 
local update_sql = "update test set ch = 'hello2' where id =" .. res.insert_id  
res, err, errno, sqlstate = db:query(update_sql)  
if not res then  
   ngx.say("update error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  
ngx.say("update rows : ", res.affected_rows, "<br/>")  
  
local select_sql = "select id, ch from test"  
res, err, errno, sqlstate = db:query(select_sql)  
if not res then  
   ngx.say("select error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  
  
for i, row in ipairs(res) do  
   for name, value in pairs(row) do  
     ngx.say("select row ", i, " : ", name, " = ", value, "<br/>")  
   end  
end  
  
ngx.say("<br/>")  
  
local ch_param = ngx.req.get_uri_args()["ch"] or ''  
 
local query_sql = "select id, ch from test where ch = " .. ngx.quote_sql_str(ch_param)  
res, err, errno, sqlstate = db:query(query_sql)  
if not res then  
   ngx.say("select error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  
for i, row in ipairs(res) do  
   for name, value in pairs(row) do  
     ngx.say("select row ", i, " : ", name, " = ", value, "<br/>")  
   end  
end  
  

local delete_sql = "delete from test"  
res, err, errno, sqlstate = db:query(delete_sql)  
if not res then  
   ngx.say("delete error : ", err, " , errno : ", errno, " , sqlstate : ", sqlstate)  
   return close_db(db)  
end  
  
ngx.say("delete rows : ", res.affected_rows, "<br/>")  
  
  
close_db(db)  


 

在上面的程式碼中，展示了基本的創表、插入資料、修改資料、查詢資料、刪除資料的一些功能。

其中用到的lua-resty-mysql的一些API方法：

• syntax: db, err = mysql:new() 建立一個mysql資料庫連線物件
• syntax: ok, err = db:connect(options) 嘗試遠端連線mysql
  • host mysql的主機名
  • port 埠
  • database 資料庫名
  • user 使用者名稱
  • password 密碼
  • charset 編碼
• syntax: db:set_timeout(time) 設定資料庫連線超時時間
• syntax: ok, err = db:set_keepalive(max_idle_timeout, pool_size) 設定連線池
• syntax: ok, err = db:close() 關閉資料庫
• syntax: bytes, err = db:send_query(query) 傳送查詢

lua-resty-mysql的一些關鍵的API方法，見https://github.com/openresty/lua-resty-mysql#table-of-contents

vim /usr/example/example.conf 在配置檔案配置：

location /lua_mysql {
   default_type 'text/html';
   lua_code_cache on;
   content_by_lua_file /usr/example/lua/test_mysql.lua;
 }

瀏覽器訪問http://116.196.177.123/lua_mysql，瀏覽器顯示以下的內容：

insert rows : 1 , id : 2
update rows : 1
select row 1 : ch = hello
select row 1 : id = 1
select row 2 : ch = hello2
select row 2 : id = 2

delete rows : 2

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