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.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum 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 restart
mysql -u root -p
set password for root@localhost = password('123');
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 : 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
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,欢迎关注亿速云行业资讯频道。
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原文链接:https://my.oschina.net/u/4588934/blog/4592571