本篇文章为大家展示了如何进行OpenResty连接Mysql，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
centos 安装mysl
Centos系统下安装mysql，先下载mysql-community-release-el7-5.noarch.rpm，然后通过yum安装，安装过程一直确定【Y】即可。
cd /usr/downloads/wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmrpm -ivh mysql-community-release-el7-5.noarch.rpmyum install mysql-community-server安装成功后，重启mysql，并进入mysql数据库，给root用户设置一个密码，密码为“123”。
service mysqld restartmysql -u root -pset password for root@localhost = password('123');openresty连接mysql
lua-resty-mysql模块的官方文档地址： https://github.com/openresty/lua-resty-mysql
lua-resty-mysql - Lua MySQL client driver for ngx_lua based on the cosocket API
lua-resty-mysql模块是基于cosocket API 为ngx_lua提供的一个Lua MySQL客户端。它保证了100%非阻塞。
vim /usr/example/lua/test_mysql.lua，添加以下的代码：
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)在上面的代码中，展示了基本的创表、插入数据、修改数据、查询数据、删除数据的一些功能。
其中用到的lua-resty-mysql的一些API方法：
syntax: db, err = mysql:new() 创建一个mysql数据库连接对象
syntax: ok, err = db:connect(options) 尝试远程连接mysql
host mysql的主机名
port 端口
database 数据库名
user 用户名
password 密码
charset 编码
syntax: db:set_timeout(time) 设置数据库连接超时时间
syntax: ok, err = db:set_keepalive(max_idle_timeout, pool_size) 设置连接池
syntax: ok, err = db:close() 关闭数据库
syntax: bytes, err = db:send_query(query) 发送查询
lua-resty-mysql的一些关键的API方法，见https://github.com/openresty/lua-resty-mysql#table-of-contents
vim /usr/example/example.conf 在配置文件配置：
location /lua_mysql { default_type 'text/html'; lua_code_cache on; content_by_lua_file /usr/example/lua/test_mysql.lua; }浏览器访问http://116.196.177.123/lua_mysql，浏览器显示以下的内容：
insert rows : 1 , id : 2update rows : 1select row 1 : ch = helloselect row 1 : id = 1select row 2 : ch = hello2select row 2 : id = 2delete rows : 2上述内容就是如何进行OpenResty连接Mysql，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注编程网行业资讯频道。
