错误：
require 'luasql.mysql'
stdin:1: module 'luasql.mysql' not found:
no field package.preload['luasql.mysql']
no file '/usr/local/share/lua/5.3/luasql/mysql.lua'
no file '/usr/local/share/lua/5.3/luasql/mysql/init.lua'
no file '/usr/local/lib/lua/5.3/luasql/mysql.lua'
no file '/usr/local/lib/lua/5.3/luasql/mysql/init.lua'
no file './luasql/mysql.lua'
no file './luasql/mysql/init.lua'
no file '/usr/local/lib/lua/5.3/luasql/mysql.so'
no file '/usr/local/lib/lua/5.3/loadall.so'
no file './luasql/mysql.so'
no file '/usr/local/lib/lua/5.3/luasql.so'
no file '/usr/local/lib/lua/5.3/loadall.so'
no file './luasql.so'
stack traceback:
[C]: in function 'require'
stdin:1: in main chunk
[C]: in ?
环境： ubuntu 已安装lua，未安装mysql
解决方案
一、先安装mysql
Ubuntu上安装MySQL非常简单只需要几条命令就可以完成。
1. sudo apt-get install mysql-server
2. apt-get isntall mysql-client
3. sudo apt-get install libmysqlclient-dev
参考链接
http://www.linuxidc.com/Linux/2016-07/133128.htm
二 安装luasql-mysql
luarocks install luasql-mysql
参考链接 http://www.runoob.com/lua/lua-database-access.html
三 安装luasql-mysql 出错
Error: Could not find header file for MYSQL
No file mysql.h in /usr/local/mysql
You may have to install MYSQL in your system and/or pass MYSQL_DIR or MYSQL_INCDIR to the luarocks command.
Example: luarocks install luasql-mysql MYSQL_DIR=/usr/local
解决方法：
在终端执行whereis mysql 找到mysql 的include路径
luarocks install luasql-mysql MYSQL_INCDIR=/usr/include/mysql
注释：配置自己查到的mysql.h 所在路径