Single
Returns all selected columns for a single row
Database.single(query, data, cb)- query: 
string - data?: 
table - cb?: 
function(result) 
returns: table
local result = Database.single('SELECT `column1`, `column2` FROM `table` WHERE `column3` = ? LIMIT 1' , { 'value1' })
 
print(result.column1, result.column2)