Improve a bit the code...

..., remove one deprecated function, use mod.conf for name and description.

abstraction.lua

@@ -1,5 +1,4 @@
 local modname = minetest.get_current_modname()
-
 local thismod = _G[modname]
 
 ---- Table creation & deletion
@@ -33,6 +32,7 @@ function thismod.create_table_sql(name, params)
   end
   return 'CREATE TABLE ' .. name .. ' (' .. table.concat(lines, ',') .. ')'
 end
+
 function thismod.create_table(name, params)
   thismod.conn:query(thismod.create_table_sql(name, params))
 end
@@ -40,6 +40,7 @@ end
 function thismod.drop_table_sql(name)
   return 'DROP TABLE ' .. name
 end
+
 function thismod.drop_table(name)
   thismod.conn:query(thismod.drop_table_sql(name))
 end
@@ -96,6 +97,7 @@ end
 function thismod.prepare_select_sql(tablename, colnames, where)
   return 'SELECT ' .. table.concat(colnames, ',') .. ' FROM ' .. tablename .. ' WHERE ' .. where
 end
+
 function thismod.prepare_select(tablename, cols, where, wheretypes)
   local colnames, coltypes = {}, {}
   for _, col in ipairs(cols) do

init.lua

@@ -11,12 +11,14 @@ function thismod.mklog(level, modname)
     minetest.log(level, "[" .. modname .. "] " .. str)
   end
 end
+
 local LogI = thismod.mklog('action', modname)
 local LogE = thismod.mklog('error', modname)
 
 local singleplayer = minetest.is_singleplayer() -- Caching is OK since you can't open a game to
 -- multiplayer unless you restart it.
-if minetest.setting_get(modname .. '.enable_singleplayer') ~= 'true' and singleplayer then
+
+if minetest.settings:get(modname .. '.enable_singleplayer') ~= 'true' and singleplayer then
   LogI("Not enabling because of singleplayer game")
   return
 end
@@ -202,6 +204,7 @@ local function ping()
   end
   minetest.after(1800, ping)
 end
+
 minetest.after(10, ping)
 
 local shutdown_callbacks = {}

mod.conf

@@ -0,0 +1,2 @@
+name = mysql_base
+description = MySQL connector (requires LuaJIT FFI).