# Functions
MustNew return a new db.Client without an error.
MustNewSQLXClient return a new db.Client without an error.
New return a new db.Client.
NewSQLXClient return a new db.Client.
Select runs query on database with arguments and saves result on dest variable.
# Structs
Client is a wrapper of a sql.DB client.
SQLXClient is a wrapper of a sqlx.DB client.
# Interfaces
Service is an interface of db.Service.