Class: Audrey::Engine::SQLite3::Query::Q0

Inherits:
Object
  • Object
show all
Defined in:
lib/audrey/engine/sqlite3/query/q0.rb

Overview

Audrey::Engine::SQLite3::Query::Q0

Instance Method Summary collapse

Constructor Details

#initialize(p_engine, p_fquery) ⇒ Q0

initialize



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 8

def initialize(p_engine, p_fquery)
	@engine = p_engine
	@dbh = @engine.dbh
	@fquery = p_fquery
	set_query_pk()
end

Instance Method Details

#aclasses(wheres, params) ⇒ Object

aclasses



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 231

def aclasses(wheres, params)
	fcs = @fquery.aclasses
	fcs.any? or return
	where = []
	
	# loop through aclasses
	fcs.each do |fc|
		rs = Audrey::Util.randstr(40)
		params[rs] = fc
		where.push ':' + rs
	end
	
	# add to wheres
	wheres.push 'aclass in (' + where.join(', ') + ')'
end

#count ⇒ Object

count



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 207

def count
	# $tm.hrm
	subqueries = prepare_subqueries()
	
	# sql
	sql = <<~'SQL'
	select count(*) as count
	from objects o, query_rows qr
	where
		o.pk = qr.parent and
		qr.subquery = :sqpk
	SQL
	
	# return count
	return @dbh.get_first_value(sql, 'sqpk'=>subqueries['objects'])
end

#each(opts = {}) ⇒ Object

each



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 91

def each(opts={})
	itr = iterator(opts)
	
	itr.each do |row|
		yield row['pk']
	end
ensure
	itr and itr.close
end

#hash_pairs(wheres, params) ⇒ Object

hash_pairs



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 254

def hash_pairs(wheres, params)
	# $tm.hrm
	
	# loop through fields
	@fquery.fields.each do |k, vals|
		# key
		krs = Audrey::Util.randstr(40)
		params[krs] = k
		
		# if we're looking for a null value
		is_null = false
		
		# initialize clause
		clause = '(hkey=:' + krs + ')'
		
		# if specific values are wanted
		unless [*vals].include?(Audrey::Query::Q0::Defined)
			send_vals = []
			
			# force to array
			# Note: just using [*vals] doesn't work because if vals is nil
			# then [*vals] is an empty array
			if not vals.is_a?(Array)
				vals = [vals]
			end
			
			vals.each do |val|
				if val.nil?
					is_null = true
				else
					vrs = Audrey::Util.randstr(40)
					params[vrs] = val
					send_vals.push ':' + vrs
				end
			end
			
			# ors
			ors = []
			
			# send_vals
			if send_vals.any?
				ors.push 'scalar in (' + send_vals.join(', ') + ')'
			end
			
			# if null
			if is_null
				ors.push 'scalar is null'
			end
			
			# add scalar conditions to clause
			clause += ' and (' + ors.join(') or (') + ')'
		end
		
		# if looking for a null value, add condition in which the parent
		# element is selected if no such key/value pair exists
		if is_null
			null_clause = "((select count(*) from hash_pairs hp where parent=hv.parent and hkey=:#{krs} ) = 0)"
			clause = "(#{clause}) or #{null_clause}"
		end
		
		# add where clause
		wheres.push clause
	end
end

#iterator(opts = {}) ⇒ Object

iterator



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 50

def iterator(opts={})
	# $tm.hrm
	subqueries = prepare_subqueries()
	exec_opts = {}
	
	# sql
	sql = <<~'SQL'
	select o.pk
		from objects o, query_rows qr
	where
		o.pk = qr.parent and
		qr.subquery = :sqpk
	SQL
	
	# options
	exec_opts['sqpk'] = subqueries['objects']
	
	# limit
	if @fquery.limit
		exec_opts['limit'] = @fquery.limit
		sql += "limit :limit\n"
	end
	
	# offset
	if @fquery.offset
		exec_opts['offset'] = @fquery.offset
		sql += "offset :offset\n"
	end
	
	# stmt and resultset
	stmt = @dbh.prepare(sql)
	return stmt.execute(exec_opts)
end

#select_hash_elements(subqueries) ⇒ Object

select_hash_elements



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 170

def select_hash_elements(subqueries)
	# $tm.hrm
	
	# early exit
	@fquery.fields.any? or return
	
	# build sql and params
	sql = "select distinct :sqpk as sqpk, hv.parent\nfrom hash_pairs hv\nwhere"
	wheres = []
	params = {}
	
	# sub_query_pk
	subqueries['hash'] = params['sqpk'] = sub_query_pk()
	
	# hash values
	hash_pairs wheres, params
	
	# add wheres
	sql += "\n(" + wheres.join(") and\n(") + ')'
	
	# wrap in insert
	sql = <<~"SQL"
	insert into query_rows
	#{sql}
	SQL
	
	# execute
	@engine.dbh.execute sql, params
end

#select_objects(subqueries) ⇒ Object

select_objects



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 108

def select_objects(subqueries)
	# $tm.hrm
	
	# query params
	params = {}
	subqueries['objects'] = params['sqpk'] = sub_query_pk()
	
	# initial sql
	sql = <<~'SQL'
	select
		:sqpk as sqpk, pk
	from
		objects
	where
		(partition = :partition)
	SQL
	
	# partition pk
	params['partition'] = @engine.partition
	
	# aclasses
	if (aclasses = @fquery.aclasses) and aclasses.any?
		wheres = []
		
		aclasses.each do |aclass|
			rs = Audrey::Util.randstr(40)
			wheres.push ":#{rs}"
			params[rs] = aclass
		end
		
		# add wheres
		sql += "	and\n" + '	(aclass in (' + wheres.join(', ') + '))'
	end
	
	# limit to hashes
	if subqueries['hash']
		sql = <<~"SQL"
		#{sql} and
			(pk in (select parent from query_rows where subquery=:hashsqpk))
		SQL
		
		params['hashsqpk'] = subqueries['hash']
	end
	
	# prepend insert into
	sql = <<~"SQL"
	insert into
		query_rows(subquery, parent)
	#{sql}
	SQL
	
	# execute
	@dbh.execute sql, params
end

#set_query_pk ⇒ Object

set_query_pk



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 22

def set_query_pk
	@qpk = Audrey::Util.randstr(40)
	sql = 'insert into queries(pk) values(:qpk)'
	@dbh.execute sql, 'qpk'=>@qpk
end

#sub_query_pk ⇒ Object

sub_query_pk



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# File 'lib/audrey/engine/sqlite3/query/q0.rb', line 35

def sub_query_pk()
	# $tm.hrm
	rv = Audrey::Util.randstr(40)
	sql = 'insert into subqueries(pk, query) values(:sqpk, :qpk)'
	@dbh.execute sql, 'sqpk'=>rv, 'qpk'=>@qpk
	return rv
end