Connecting to databases can be done using ODBC bindings for Lua, or native Lua drivers for databases.
Another way to connect to databases—the preferred way—is to create HTTP queries from Lua and leave the HTTP server (or servers) the burden of managing connection pools, scalability, concurrence, and so on with tried and true well-known techniques.
Here, we'll see this preferred way.
Create a dialplan extension "12348" that will call our last Lua script. Edit the
<include> <extension name="Connect to DataBase"> <condition field="destination_number" expression="^(12348)$"> <action application="answer"/> <action application="sleep" data="1000"/> ...