Class: Audrey::Engine::SQLite3::Importer::CSV

Inherits:
Audrey::Engine::SQLite3::Importer show all
Defined in:
lib/audrey/engine/sqlite3.rb

Overview

Audrey::Engine::SQLite3::Importer::CSV

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(engine, fclass, path, opts = {}) ⇒ CSV

initialize



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# File 'lib/audrey/engine/sqlite3.rb', line 1217

def initialize(engine, fclass, path, opts={})
	# $tm.hrm
	require 'csv'
	@engine = engine
	@dbh = @engine.dbh
	@fclass = fclass.to_s
	@path = path
	@partition = 'm'
	@fields = {}
	@verbose = false
end

Instance Attribute Details

#fields ⇒ Object (readonly)

Returns the value of attribute fields.



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# File 'lib/audrey/engine/sqlite3.rb', line 1211

def fields
  @fields
end

#verbose ⇒ Object

Returns the value of attribute verbose.



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# File 'lib/audrey/engine/sqlite3.rb', line 1212

def verbose
  @verbose
end

Instance Method Details

#fclass_pks ⇒ Object

fclass_pks



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# File 'lib/audrey/engine/sqlite3.rb', line 1412

def fclass_pks
	@bclasses = {}
	
	# object bclass primary key
	@obj_bclass_pk = set_fclass_pk('Audrey::Object::Hash')
	
	# object fclass primary key
	@obj_fclass_pk = set_fclass_pk(@fclass)
	
	# scalar base class
	@scalar_bclass_pk = set_fclass_pk('Audrey::Object::Scalar')
	
	# loop through scalar classes
	[String, Integer, Float, NilClass].each do |clss|
		@bclasses[clss] = set_fclass_pk(Audrey::RUBY_OBJECT_TO_AUDREY[clss]['fclass'].to_s)
	end
end

#prepare_statements ⇒ Object

prepare_statements



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# File 'lib/audrey/engine/sqlite3.rb', line 1335

def prepare_statements
	# $tm.hrm
	
	# hash
	sql = <<~'SQL'
	insert into
		base_objects(
			pk,
			partition,
			bclass_pk,
			fclass_pk
		)
		
		values(
			:pk,
			:partition,
			:bclass,
			:fclass
		);
	SQL
	
	# prepare
	@insert_hash = @dbh.prepare(sql)
	
	# scalar
	sql = <<~'SQL'
	insert into
		base_objects(
			pk,
			partition,
			bclass_pk,
			fclass_pk,
			scalar
		)
		
		values(
			:pk,
			:partition,
			:bclass,
			:fclass,
			:scalar
		);
	SQL
	
	# prepare
	@insert_scalar = @dbh.prepare(sql)
	
	# relationship
	sql = <<~'SQL'
	insert into relationships(
		pk,
		parent,
		child,
		hkey,
		ord
	)
	
	values(
		:pk,
		:parent,
		:child,
		:hkey,
		:ord
	)
	SQL
	
	# prepare
	@insert_relationship = @dbh.prepare(sql)
end

#run ⇒ Object

run



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# File 'lib/audrey/engine/sqlite3.rb', line 1236

def run
	# $tm.hrm
	converters = {}
	count = 0
	
	# set fclass primary keys
	fclass_pks()
	
	# prepare statements
	prepare_statements()
	
	# build converters
	@fields.each do |k, dfn|
		converters[k] = Audrey::AUDREY_SCALAR_TO_RUBY[dfn.to_s]
	end
	
	# begin transaction
	@dbh.execute 'begin transaction'
	
	# TESTING
	$tm.timer('import') do
		# loop through CSV
		::CSV.foreach(@path, headers: true) do |row|
			# verbosify
			if @verbose
				count += 1
				puts count.to_s + ': ' + row.to_s
			end
			
			# init collection ord
			ord = 0
			
			# convert
			converters.each do |k, converter|
				if row.has_key?(k)
					row[k] = converter.call(row[k])
				end
			end
			
			# object pk
			obj_pk = Audrey::Util.uuid
			
			# add hash object
			@insert_hash.execute(
				'pk'=>obj_pk,
				'partition'=>@partition,
				'bclass'=>@obj_bclass_pk,
				'fclass'=>@obj_fclass_pk
			);
			
			# add scalars and relationships
			row.each do |k,v|
				ord += 1
				scalar_uuid = Audrey::Util.uuid
				
				# add scalar object
				@insert_scalar.execute(
					'pk'=>scalar_uuid,
					'partition'=>@partition,
					'bclass'=>@scalar_bclass_pk,
					'fclass'=>@bclasses[v.class],
					'scalar'=>v
				);
				
				# add relationship
				@insert_relationship.execute(
					'pk'=>Audrey::Util.uuid,
					'parent'=>obj_pk,
					'child'=>scalar_uuid,
					'hkey'=>k,
					'ord'=>ord
				);
			end
		end
	end
	
	# commit transaction
	$tm.timer('commit') do
		@dbh.execute 'commit'
	end
	
# close prepared statements
ensure
	$tm.puts 'close prepared statements'
	
	$tm.timer('close prepared statements') do
		@insert_hash and @insert_hash.close
		@insert_scalar and @insert_scalar.close
		@insert_relationship and @insert_relationship.close
	end
end

#set_fclass_pk(set_fclass) ⇒ Object

set_fclass_pk



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# File 'lib/audrey/engine/sqlite3.rb', line 1437

def set_fclass_pk(set_fclass)
	# $tm.hrm
	
	# ensure fclass record
	sql = <<~'SQL'
	insert or ignore into
	fclasses(name)
	values(:fclass);
	SQL
	
	# execute
	@dbh.execute sql, 'fclass'=>set_fclass
	
	# get fclass pk
	sql = 'select pk from fclasses where name=:fclass'
	return @dbh.get_first_value(sql, 'fclass'=>set_fclass)
end