Class: Audrey::Engine::SQLite3

Inherits:
Audrey::Engine show all
Extended by:
Forwardable
Defined in:
lib/audrey/engine/sqlite3.rb

Overview

Audrey::Engine::SQLite3

Defined Under Namespace

Modules: Init Classes: Importer, Query, Transaction

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(p_path, p_mode, opts = {}) ⇒ SQLite3

initialize


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# File 'lib/audrey/engine/sqlite3.rb', line 19

def initialize(p_path, p_mode, opts={})
	# default options
	opts = {'immediate_commit'=>true}.merge(opts)
	
	# set some properties
	@path = p_path
	@immediate_commit = opts['immediate_commit'] ? true : false
	@preps = {}
	@mode = p_mode
	
	# KLUDGE: For now, default to partition 'm'
	@partition = 'm'
	
	# lock file
	set_lock()
	
	# if file exists
	existed = File.exist?(@path)
	
	# open database handle
	@dbh = get_dbh()
	
	# custom functions
	custom_functions()
	
	# create and structure database if the file doesn't exist
	if not existed
		require 'audrey/engine/sqlite3/init'
		Audrey::Engine::SQLite3::Init.build @dbh
	end
	
	# transactions
	@transactions = []
	
	# initial transaction
	if @immediate_commit
		@transactions.push Audrey::Engine::SQLite3::Transaction::AutoCommit.new(self)
	else
		@transactions.push Audrey::Engine::SQLite3::Transaction::RC.new(self)
	end
	
	# create stuff just for this session
	self.class.session_tables @dbh
end

Instance Attribute Details

#dbh ⇒ Object (readonly)

Returns the value of attribute dbh.


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# File 'lib/audrey/engine/sqlite3.rb', line 8

def dbh
  @dbh
end

#partition ⇒ Object

Returns the value of attribute partition.


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# File 'lib/audrey/engine/sqlite3.rb', line 12

def partition
  @partition
end

#path ⇒ Object (readonly)

Returns the value of attribute path.


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# File 'lib/audrey/engine/sqlite3.rb', line 10

def path
  @path
end

#preps ⇒ Object (readonly)

Returns the value of attribute preps.


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# File 'lib/audrey/engine/sqlite3.rb', line 11

def preps
  @preps
end

#transactions ⇒ Object (readonly)

Returns the value of attribute transactions.


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# File 'lib/audrey/engine/sqlite3.rb', line 9

def transactions
  @transactions
end

Instance Method Details

#add_relationship(parent_pk, child_pk, opts = {}) ⇒ Object

add_relationship


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# File 'lib/audrey/engine/sqlite3.rb', line 515

def add_relationship(parent_pk, child_pk, opts={})
	# ensure prepared statement
	if not @preps['add_relationship']
		sql = <<~SQL
		insert into relationships(pk, parent, child, ord, hkey)
			values(
				:pk,
				:parent,
				:child,
		
				case
					when :ord is null then
						coalesce((select max(ord) from relationships where parent=parent), 0) + 1
					else :ord
				end,
		:hkey)
		SQL
		
		@preps['add_relationship'] = @dbh.prepare(sql)
	end
	
	# uuid for new relationship record
	pk = Audrey::Util.uuid
	
	# execute
	begin
		@preps['add_relationship'].execute(
			sql,
			'pk'=>pk,
			'parent'=>parent_pk,
			'child'=>child_pk,
			'ord'=>opts['ord'],
			'hkey'=>opts['hkey']
		);
	ensure
		@preps['add_relationship'].reset!
	end
	
	# return
	return pk
end

#add_xt(obj_pk, xt_pk) ⇒ Object

add_xt


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# File 'lib/audrey/engine/sqlite3.rb', line 461

def add_xt(obj_pk, xt_pk)
	# $tm.hrm
	
	# prepare insert statement if necessary
	if not @preps['insert_xt']
		sql = <<~SQL
		insert into objects(pk, partition, bclass, fclass)
		values(?, (select partition from objects where pk=?), 'Audrey::Object::Hash', 'xt')
		SQL
		
		@preps['insert_xt'] ||= @dbh.prepare(sql)
	end
	
	# create xt
	simple_exec @preps['insert_xt'], xt_pk, obj_pk
	
	# associate record
	@preps['add_xt'] ||= @dbh.prepare('update objects set xt=:xtpk where pk=:pk and partition=:partition')
	simple_exec @preps['add_xt'], 'xtpk'=>xt_pk, 'pk'=>obj_pk, 'partition'=>@partition
end

#ancestors(child_pk) ⇒ Object

ancestors


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# File 'lib/audrey/engine/sqlite3.rb', line 959

def ancestors(child_pk)
	# sql to add parents
	if not @preps['ancestors']
		sql = <<~'SQL'
		select *
			from objects where pk in (
				with recursive
					ancestors(c) as (
						values(:child_pk)
						union
						select parent from relationships, ancestors
						where relationships.child=ancestors.c
					)
				select parent from relationships
					where relationships.child in ancestors
		);
		SQL
		
		@preps['ancestors'] = @dbh.prepare(sql)
	end
	
	# loop through results
	@preps['ancestors'].execute('child_pk'=>child_pk).each do |row|
		yield row
	end
ensure
	@preps['ancestors'] and @preps['ancestors'].reset!
end

#array_each(parent_pk) ⇒ Object

array_each


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# File 'lib/audrey/engine/sqlite3.rb', line 899

def array_each(parent_pk)
	# $tm.hrm
	
	# ensure statement handle
	if not @preps['array_each']
		sql = <<~SQL
		select r.ord as ord, o.*
		from relationships r, objects o
		where r.parent=:parent and o.pk=r.child
		order by r.ord
		SQL
		
		@preps['array_each'] = @dbh.prepare(sql)
	end
	
	# loop through records
	@preps['array_each'].execute('parent'=>parent_pk).each_hash do |row|
		yield row
	end
ensure
	@preps['array_each'] and @preps['array_each'].reset!
end

#changed_get(pk) ⇒ Object

changed_get


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# File 'lib/audrey/engine/sqlite3.rb', line 794

def changed_get(pk)
	# $tm.hrm
	
	# prepare
	@preps['changed_get'] ||= @dbh.prepare('select changed from objects where pk=:pk')
	
	# execute
	@preps['changed_get'].execute('pk'=>pk).each_hash do |row|
		return row['changed']
	end
ensure
	@preps['changed_get'] and @preps['changed_get'].reset!
end

#changed_objects ⇒ Object

changed_objects


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# File 'lib/audrey/engine/sqlite3.rb', line 1019

def changed_objects
	# $tm.hrm
	
	# sql to add parents
	if not @preps['changed_objects']
		sql = <<~'SQL'
		select *
			from objects
		where
			changed and
			custom_class(fclass)
		order by
			changed
		SQL
		
		@preps['changed_objects'] = @dbh.prepare(sql)
	end
	
	# loop through results
	@preps['changed_objects'].execute().each do |row|
		yield row
	end
ensure
	@preps['changed_objects'] and @preps['changed_objects'].reset!
end

#changed_set(pk, bool) ⇒ Object

changed_set


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# File 'lib/audrey/engine/sqlite3.rb', line 815

def changed_set(pk, bool)
	# $tm.hrm
	
	# set to changed
	if bool
		@preps['changed_set_true'] ||= @dbh.prepare('update base_objects set changed=current_timestamp where pk=:pk')	
		simple_exec @preps['changed_set_true'], 'pk'=>pk
	else
		@preps['changed_set_false'] ||= @dbh.prepare('update base_objects set changed=null where pk=:pk')	
		simple_exec @preps['changed_set_false'], 'pk'=>pk
	end
end

#clear_collection(parent_pk) ⇒ Object

clear_collection


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# File 'lib/audrey/engine/sqlite3.rb', line 777

def clear_collection(parent_pk)
	# $tm.hrm
	
	# prepare
	@preps['clear_collection'] ||= @dbh.prepare('delete from relationships where parent=:parent')
	
	# execute
	simple_exec @preps['clear_collection'], 'parent'=>parent_pk
end

#close(opts = {}) ⇒ Object

close


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# File 'lib/audrey/engine/sqlite3.rb', line 190

def close(opts={})
	# $tm.hrm
	
	# close prepared statements
	@preps.keys.each do |key|
		stmt = @preps[key]
		
		if stmt and (not stmt.closed?)
			stmt.close
		end
		
		@preps.delete key
	end
	
	# purge
	if opts['purge']
		purge()
	end
	
	# close database handle
	if not @dbh.closed?
		@dbh.close
	end
	
	# unlock file
	if @lock
		@lock.flock File::LOCK_UN
		@lock.close
	end
end

#collection_child_pks(parent_pk) ⇒ Object

collection_child_pks


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# File 'lib/audrey/engine/sqlite3.rb', line 835

def collection_child_pks(parent_pk)
	# $tm.hrm
	
	# prepare
	if not @preps['collection_child_pks']
		sql = <<~'SQL'
		select child
		from relationships
		where parent=:parent
		SQL
		
		@preps['collection_child_pks'] ||= @dbh.prepare(sql)
	end
	
	# init
	rv = []
	
	# get count
	@preps['collection_child_pks'].execute(parent_pk).each_hash do |row|
		rv.push row['child']
	end
	
	# return
	return rv
ensure
	@preps['collection_child_pks'] and @preps['collection_child_pks'].reset!
end

#collection_length(parent_pk) ⇒ Object

collection_length


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# File 'lib/audrey/engine/sqlite3.rb', line 870

def collection_length(parent_pk)
	# $tm.hrm
	
	# prepare
	if not @preps['collection_length']
		sql = <<~'SQL'
		select count(*) as count
		from relationships
		where parent=:parent
		SQL
		
		@preps['collection_length'] ||= @dbh.prepare(sql)
	end
	
	# get count
	@preps['collection_length'].execute(parent_pk).each_hash do |row|
		return row['count']
	end
ensure
	@preps['collection_length'] and @preps['collection_length'].reset!
end

#commit ⇒ Object

commit, rollback


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# File 'lib/audrey/engine/sqlite3.rb', line 92

def commit
	return @transactions[0].commit
end

#custom_functions ⇒ Object

custom_functions


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# File 'lib/audrey/engine/sqlite3.rb', line 228

def custom_functions()
	#-----------------------------------------------------------------------
	# partition
	#
	@dbh.create_function('current_partition', 0) do |func|
		func.result = @partition
	end
	#
	# partition
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# insert_object_journal
	#
	@dbh.create_function('insert_object_journal', 4 ) do |func, partition, root, fclass, scalar, xt|
		# $tm.hrm
		
		# translate scalars to objects for storage in JSON
		if converter = Audrey::AUDREY_SCALAR_TO_RUBY[fclass]
			scalar = converter.call(scalar)
		end
		
		# initialize
		rv = {}
		rv['fc'] = fclass
		rv['pt'] = partition
		
		# scalar
		if rv['s'].is_a?(String)
			rv['s'] = scalar.force_encoding('UTF-8')
		end
		
		# xt
		if xt
			rv['xt'] = xt
		end
		
		# root
		if root == 1
			rv['root'] = true
		end
		
		# set return result
		func.result = JSON.generate(rv)
	end
	#
	# insert_object_journal
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# fclass_fco, fclass_isolate
	#
	@dbh.create_function('fclass_fco', 1) do |func, fclass|
		func.result = Audrey::Util.fclass_fco(fclass) ? 1 : 0
	end
	
	@dbh.create_function('fclass_isolate', 1) do |func, fclass|
		func.result = Audrey::Util.fclass_isolate(fclass) ? 1 : 0
	end
	#
	# fclass_fco, fclass_isolate
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# graph_field
	#
	@dbh.create_function('graph_field', 2) do |func, fclass, hkey|
		func.result = Audrey::Util.graph_field?(fclass, hkey) ? 1 : 0
	end
	#
	# graph_field
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# change_to_true
	#
	# @dbh.create_function('change_to_true', 1) do |func, fclass|
	# 	func.result = 1
	# end
	#
	# change_to_true
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# custom_class
	#
	@dbh.create_function('custom_class', 1) do |func, fclass|
		func.result = Audrey::Util.custom_class?(fclass) ? 1 : 0
	end
	#
	# custom_class
	#-----------------------------------------------------------------------
	
	
	#-----------------------------------------------------------------------
	# debug
	#
	@dbh.create_function('debug', 1) do |func, msg|
		puts msg
		func.result = 1
	end
	#
	# debug
	#-----------------------------------------------------------------------
end

#delete_object(pk) ⇒ Object

delete_object


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# File 'lib/audrey/engine/sqlite3.rb', line 437

def delete_object(pk)
	# $tm.hrm
	
	# ensure statement handle
	if not @preps['delete_object']
		sql = <<~'SQL'
		delete from objects
		where pk=:pk and partition=:partition
		SQL
		
		@preps['delete_object'] = @dbh.prepare(sql)
	end
	
	# execute
	simple_exec @preps['delete_object'], 'pk' => pk, 'partition' => @partition
end

#get_dbh ⇒ Object

get_dbh


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# File 'lib/audrey/engine/sqlite3.rb', line 71

def get_dbh
	# get database handle
	rv = ::SQLite3::Database.new(@path)
	
	# enforce referential integrity
	rv.execute 'pragma foreign_keys=on'
	
	# results as hash
	rv.results_as_hash = true
	
	# return
	return rv
end

#get_xt(obj_pk) ⇒ Object

get_xt


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# File 'lib/audrey/engine/sqlite3.rb', line 489

def get_xt(obj_pk)
	# prepare statement if necessary
	@preps['existing_xt'] ||= @dbh.prepare('select xt from objects where pk=:pk and partition=:partition')
	
	# search
	@preps['existing_xt'].execute('pk'=>obj_pk, 'partition'=>@partition).each do |row|
		return row['xt']
	end
	
	# create
	xt_pk = Audrey::Util.uuid
	add_xt obj_pk, xt_pk
	
	# return
	return xt_pk
ensure
	@preps['existing_xt'] and @preps['existing_xt'].reset!
end

#hash_each(parent_pk) ⇒ Object

hash_each


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# File 'lib/audrey/engine/sqlite3.rb', line 725

def hash_each(parent_pk)
	# $tm.hrm
	rv = nil
	
	# loop through keys
	hash_keys(parent_pk).each do |key|
		if block_given?
			yield key, row_hash_by_key(parent_pk, key)
		else
			rv ||= []
			rv.push [key, row_hash_by_key(parent_pk, key)]
		end
	end
	
	# return
	return rv
end

#hash_element_delete(parent_pk, key) ⇒ Object

hash_element_delete


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# File 'lib/audrey/engine/sqlite3.rb', line 634

def hash_element_delete(parent_pk, key)
	# $tm.hrm
	
	# get record
	record = row_hash_by_key(parent_pk, key)
	
	# execute
	if record
		if not @preps['delete_hash_key']
			sql = <<~'SQL'
			delete from relationships
			where parent=:parent and hkey=:hkey
			SQL
			
			@preps['delete_hash_key'] = @dbh.prepare(sql)
		end
		
		simple_exec @preps['delete_hash_key'], 'parent'=>parent_pk, 'hkey'=>key
	end
	
	# return
	return record
end

#hash_has_key?(parent_pk, key) ⇒ Boolean

hash_has_key?

Returns:

  • (Boolean) 

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# File 'lib/audrey/engine/sqlite3.rb', line 564

def hash_has_key?(parent_pk, key)
	# $tm.hrm
	# puts "parent_pk: #{parent_pk}"
	# puts "key: #{key}"
	
	# prepare
	if not @preps['hash_has_key']
		sql = <<~'SQL'
		select count(*) as count
		from relationships
		where parent=:parent and hkey=:hkey
		SQL
		
		@preps['hash_has_key'] ||= @dbh.prepare(sql)
	end
	
	# get count
	@preps['hash_has_key'].execute('parent'=>parent_pk, 'hkey'=>key).each_hash do |row|
		return row['count'] > 0
	end
ensure
	@preps['hash_has_key'] and @preps['hash_has_key'].reset!
end

#hash_keys(parent_pk) ⇒ Object

hash_keys


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# File 'lib/audrey/engine/sqlite3.rb', line 751

def hash_keys(parent_pk)
	# $tm.hrm
	rv = []
	
	# prepare
	@preps['hash_keys'] ||= @dbh.prepare('select hkey from relationships where parent=:parent order by ord')
	
	# loop through records
	@preps['hash_keys'].execute('parent'=>parent_pk).each_hash do |row|
		rv.push row['hkey']
	end
	
	# return
	return rv
	
ensure
	@preps['hash_keys'] and @preps['hash_keys'].reset!
end

#import_csv(fclass, path, opts = {}) ⇒ Object

import_csv


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# File 'lib/audrey/engine/sqlite3.rb', line 1007

def import_csv(fclass, path, opts={})
	# $tm.hrm
	return Audrey::Engine::SQLite3::Importer::CSV.new(self, fclass, path, opts={})
end

#in_transaction? ⇒ Boolean

in_transaction?

Returns:

  • (Boolean) 

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# File 'lib/audrey/engine/sqlite3.rb', line 107

def in_transaction?
	# loop through transactions
	@transactions.each do |tr|
		tr.is_a?(Audrey::Engine::SQLite3::Transaction::RC) and return true
	end
	
	# else not in transaction
	return false
end

#insert_object(object, opts = {}) ⇒ Object

insert_object


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# File 'lib/audrey/engine/sqlite3.rb', line 374

def insert_object(object, opts={})
	# $tm.hrm
	
	# pk
	pk = opts['pk'] || Audrey::Util.uuid
	
	# if scalar
	if dfn = Audrey::Engine::SQLite3::RUBY_SCALAR_TO_SQLITE[object.class]
		if not @preps['insert_scalar']
			sql = <<~'SQL'
			insert into objects(pk, partition, bclass, fclass, scalar)
			values(:pk, :partition, :bclass, :fclass, :scalar)
			SQL
			
			@preps['insert_scalar'] = @dbh.prepare(sql)
		end
		
		# insert record
		simple_exec(
			@preps['insert_scalar'],
			'pk' => pk,
			'partition' => @partition,
			'bclass' => dfn['fclass'].bclass.to_s,
			'fclass' => dfn['fclass'].to_s,
			'scalar' => dfn['to_db'].call(object)
		);
		
	# if hash or array
	elsif dfn = Audrey::RUBY_OBJECT_TO_AUDREY[object.class] and dfn['nclass']
		simple_exec(
			prepare_insert_collection(),
			'pk' => pk,
			'partition' => @partition,
			'bclass' => dfn['fclass'].bclass.to_s,
			'fclass' => dfn['fclass'].to_s
		);
		
	# if custom object
	elsif object.is_a?(Audrey::Object::Custom)
		simple_exec(
			prepare_insert_collection(),
			'pk' => pk,
			'partition' => @partition,
			'bclass' => object.class.bclass.to_s,
			'fclass' => object.class.to_s,
		);
		
	# else unknown
	else
		raise 'unknown-object-class: ' + object.class.to_s
	end
	
	# return pk
	return pk
end

#object_exists?(pk) ⇒ Boolean

object_exists?

Returns:

  • (Boolean) 

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# File 'lib/audrey/engine/sqlite3.rb', line 929

def object_exists?(pk)
	# $tm.hrm
	
	# ensure statement handle
	if not @preps['object_exists']
		sql = <<~'SQL'
		select count(*) as count
		from objects
		where
		pk=:pk and
		partition=:partition
		SQL
		
		@preps['object_exists'] = @dbh.prepare(sql)
	end
	
	@preps['object_exists'].execute('pk'=>pk, 'partition'=>@partition).each do |row|
		return row['count'] > 0
	end
ensure
	@preps['object_exists'] and @preps['object_exists'].reset!
end

#purge ⇒ Object

purge


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# File 'lib/audrey/engine/sqlite3.rb', line 346

def purge
	# $tm.hrm
	
	if @mode.write
		sql = 'delete from objects where pk in (select pk from fco_not_traced)'
		@dbh.execute sql
	end
end

#q0(p_fquery) ⇒ Object

q0


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# File 'lib/audrey/engine/sqlite3.rb', line 995

def q0(p_fquery)
	require 'audrey/engine/sqlite3/query/q0'
	return Audrey::Engine::SQLite3::Query::Q0.new(self, p_fquery)
end

#reset_savepoints(ftr) ⇒ Object

reset_savepoints


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# File 'lib/audrey/engine/sqlite3.rb', line 169

def reset_savepoints(ftr)
	found = false
	
	@transactions.each do |tr|
		if tr == ftr
			found = true
		end
		
		if found
			tr.start
		end
	end
end

#rollback ⇒ Object 


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# File 'lib/audrey/engine/sqlite3.rb', line 96

def rollback
	return @transactions[0].rollback
end

#root_pk ⇒ Object

root_pk


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# File 'lib/audrey/engine/sqlite3.rb', line 362

def root_pk
	sql = 'select pk from objects where root and partition=:partition'
	return @dbh.get_first_value(sql, 'partition'=>@partition)
end

#row_by_array_index(parent_pk, idx) ⇒ Object

row_by_array_index


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# File 'lib/audrey/engine/sqlite3.rb', line 690

def row_by_array_index(parent_pk, idx)
	# $tm.hrm
	
	# ensure statement handle
	if not @preps['row_by_array_index']
		sql = <<~SQL
		select r.ord as ord, o.*
		from relationships r, objects o
		where r.parent=:parent and o.pk=r.child
		order by r.ord
		limit 1
		offset :offset
		SQL
		
		@preps['row_by_array_index'] = @dbh.prepare(sql)
	end
	
	# get record
	@preps['row_by_array_index'].execute('parent'=>parent_pk, 'offset'=>idx).each_hash do |row|
		return self.class.set_row_scalar(row.to_h)
	end
	
	# else return nil
	return nil
ensure
	@preps['row_by_array_index'] and @preps['row_by_array_index'].reset!
end

#row_by_pk(pk) ⇒ Object

row_by_pk


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# File 'lib/audrey/engine/sqlite3.rb', line 665

def row_by_pk(pk)
	# $tm.hrm
	
	# ensure prepared statement
	@preps['row_by_pk'] ||= @dbh.prepare('select * from objects where pk=:pk and partition=:partition')
	
	# get record
	@preps['row_by_pk'].execute('pk'=>pk, 'partition'=>@partition).each_hash do |row|
		return self.class.set_row_scalar(row.to_h)
	end
	
	# didn't find the object, so return nil
	return nil
	
ensure
	@preps['row_by_pk'] and @preps['row_by_pk'].reset!
end

#row_hash_by_key(parent_pk, hkey) ⇒ Object

row_hash_by_key


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# File 'lib/audrey/engine/sqlite3.rb', line 596

def row_hash_by_key(parent_pk, hkey)
	# $tm.hrm
	
	# ensure statement handle
	if not @preps['row_hash_by_key']
		sql = <<~SQL
		select * from objects
		where pk =
			(select child from relationships where parent=:parent and hkey=:hkey) and
			partition=:partition
		SQL
		
		@preps['row_hash_by_key'] = @dbh.prepare(sql)
	end
	
	# params
	params = {}
	params['parent'] = parent_pk
	params['hkey'] = hkey
	params['partition'] = @partition
	
	# get record
	@preps['row_hash_by_key'].execute(params).each_hash do |row|
		return self.class.set_row_scalar(row.to_h)
	end
	
ensure
	@preps['row_hash_by_key'] and @preps['row_hash_by_key'].reset!
end

#transaction(opts = {}) ⇒ Object

transaction


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# File 'lib/audrey/engine/sqlite3.rb', line 124

def transaction(opts={})
	# $tm.hrm
	tr = Audrey::Engine::SQLite3::Transaction::RC.new(self)
	@transactions.push tr
	
	# block
	if block_given?
		begin
			# yield
			yield tr
			
			# autocommit if necessary
			if opts['autocommit']
				tr.commit
			end
		
		# exit transaction
		rescue Audrey::Exception::TransactionExit => e
			unless e.tr == tr
				raise e
			end
			
			# return out of this method
			return nil
		ensure
			tr.terminate
			@transactions.pop
		end
		
		# return nil
		return nil
	
	# non-block
	else
		return tr
	end
end