UsingMySql

We highly recommend the native database system in NPL: TableDatabase. It is way faster and built-in with NPL runtime.

Using MySql Client

Install Guide

• On linux platform, mysql client is by default installed when you build NPLRuntime from source code. You should find a libluasql.so in NPL runtime directory.
• On windows platform, you must manually install the mysql client connector plugin.

https://github.com/LiXizhi/luasql

Once installed, you can use it like below:

NPL.load("(gl)script/ide/mysql/mysql.lua");
local MySql = commonlib.gettable("System.Database.MySql");
local mysql_db = MySql:new():init(db_user, db_password, db_name, db_host, db_port);

A Better Way to Code

It is recommended that you write a wrapper file like my_db.page which exposes a global object such as my_db that contains functions to access to your actual database.

An example in the Admin web site framework is here.

• script/apps/WebServer/admin/wp-includes/wp-db.page

It will manage connection strings (passwords, ips, pools) from global configuration files, etc. In all other server pages, you simply include the file, and call its functions like this

local query = string.format("select * from wp_users where %s = '%s' ",db_field,value);
local user = wpdb:get_row(query);