lib/vcs4sql/sqlite/applied.rb
# frozen_string_literal: true
# MIT License
#
# Copyright (c) 2020 Yurii Dubinka
#
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# furnished to do so, subject to the following conditions:
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# SOFTWARE.
#
module Vcs4sql
module Sqlite
# The applied (existing) database change log.
class Applied
# @param [Object] conn the connection to the database.
# @param [String (frozen)] sql the query to fetch the change log from db.
def initialize(conn, sql: "select * from changelog order by version")
@conn = conn
@sql = sql
end
def empty?
changelog.empty?
end
# Ensure that applied change set has a change with particular version
def absent(version)
change(version).nil?
end
# Returns the details about applied change by version
# @param [Object] version the version of applied change
# @todo #/DEV Add verification of array usage over index.
# The changelog shouldn't be a null.
def change(version)
changelog[version]
end
private
# Evaluate the applied database change log.
# @todo #/DEV Add verification that connection not a null, throw error
# with proper error code in order to explain the problem.
# Potentially we need to define the class with error codes.
def changelog
return @changelog if defined? @changelog
@changelog = @conn.query(@sql).map do |row|
Changelog.new(
row["file"], row["applied"], row["version"], row["md5sum"],
row["sql"], id: row["id"]
)
end
end
end
end
end