/usr/lib/ruby/vendor_ruby/sequel/adapters/sqlite.rb is in ruby-sequel 4.15.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Sequel.require 'adapters/shared/sqlite'
module Sequel
# Top level module for holding all SQLite-related modules and classes
# for Sequel.
module SQLite
TYPE_TRANSLATOR = tt = Class.new do
FALSE_VALUES = (%w'0 false f no n' + [0]).freeze
def blob(s)
Sequel::SQL::Blob.new(s.to_s)
end
def boolean(s)
s = s.downcase if s.is_a?(String)
!FALSE_VALUES.include?(s)
end
def date(s)
case s
when String
Sequel.string_to_date(s)
when Integer
Date.jd(s)
when Float
Date.jd(s.to_i)
else
raise Sequel::Error, "unhandled type when converting to date: #{s.inspect} (#{s.class.inspect})"
end
end
def integer(s)
s.to_i
end
def float(s)
s.to_f
end
def numeric(s)
s = s.to_s unless s.is_a?(String)
::BigDecimal.new(s) rescue s
end
def time(s)
case s
when String
Sequel.string_to_time(s)
when Integer
Sequel::SQLTime.create(s/3600, (s % 3600)/60, s % 60)
when Float
s, f = s.divmod(1)
Sequel::SQLTime.create(s/3600, (s % 3600)/60, s % 60, (f*1000000).round)
else
raise Sequel::Error, "unhandled type when converting to date: #{s.inspect} (#{s.class.inspect})"
end
end
end.new
# Hash with string keys and callable values for converting SQLite types.
SQLITE_TYPES = {}
{
%w'date' => tt.method(:date),
%w'time' => tt.method(:time),
%w'bit bool boolean' => tt.method(:boolean),
%w'integer smallint mediumint int bigint' => tt.method(:integer),
%w'numeric decimal money' => tt.method(:numeric),
%w'float double real dec fixed' + ['double precision'] => tt.method(:float),
%w'blob' => tt.method(:blob)
}.each do |k,v|
k.each{|n| SQLITE_TYPES[n] = v}
end
# Database class for SQLite databases used with Sequel and the
# ruby-sqlite3 driver.
class Database < Sequel::Database
include ::Sequel::SQLite::DatabaseMethods
set_adapter_scheme :sqlite
# Mimic the file:// uri, by having 2 preceding slashes specify a relative
# path, and 3 preceding slashes specify an absolute path.
def self.uri_to_options(uri) # :nodoc:
{ :database => (uri.host.nil? && uri.path == '/') ? nil : "#{uri.host}#{uri.path}" }
end
private_class_method :uri_to_options
# The conversion procs to use for this database
attr_reader :conversion_procs
# Connect to the database. Since SQLite is a file based database,
# available options are limited:
#
# :database :: database name (filename or ':memory:' or file: URI)
# :readonly :: open database in read-only mode; useful for reading
# static data that you do not want to modify
# :timeout :: how long to wait for the database to be available if it
# is locked, given in milliseconds (default is 5000)
def connect(server)
opts = server_opts(server)
opts[:database] = ':memory:' if blank_object?(opts[:database])
sqlite3_opts = {}
sqlite3_opts[:readonly] = typecast_value_boolean(opts[:readonly]) if opts.has_key?(:readonly)
db = ::SQLite3::Database.new(opts[:database].to_s, sqlite3_opts)
db.busy_timeout(opts.fetch(:timeout, 5000))
connection_pragmas.each{|s| log_yield(s){db.execute_batch(s)}}
class << db
attr_reader :prepared_statements
end
db.instance_variable_set(:@prepared_statements, {})
db
end
# Disconnect given connections from the database.
def disconnect_connection(c)
c.prepared_statements.each_value{|v| v.first.close}
c.close
end
# Run the given SQL with the given arguments and yield each row.
def execute(sql, opts=OPTS, &block)
_execute(:select, sql, opts, &block)
end
# Run the given SQL with the given arguments and return the number of changed rows.
def execute_dui(sql, opts=OPTS)
_execute(:update, sql, opts)
end
# Drop any prepared statements on the connection when executing DDL. This is because
# prepared statements lock the table in such a way that you can't drop or alter the
# table while a prepared statement that references it still exists.
def execute_ddl(sql, opts=OPTS)
synchronize(opts[:server]) do |conn|
conn.prepared_statements.values.each{|cps, s| cps.close}
conn.prepared_statements.clear
super
end
end
# Run the given SQL with the given arguments and return the last inserted row id.
def execute_insert(sql, opts=OPTS)
_execute(:insert, sql, opts)
end
# Handle Integer and Float arguments, since SQLite can store timestamps as integers and floats.
def to_application_timestamp(s)
case s
when String
super
when Integer
super(Time.at(s).to_s)
when Float
super(DateTime.jd(s).to_s)
else
raise Sequel::Error, "unhandled type when converting to : #{s.inspect} (#{s.class.inspect})"
end
end
private
def adapter_initialize
@conversion_procs = SQLITE_TYPES.dup
@conversion_procs['datetime'] = @conversion_procs['timestamp'] = method(:to_application_timestamp)
set_integer_booleans
end
# Yield an available connection. Rescue
# any SQLite3::Exceptions and turn them into DatabaseErrors.
def _execute(type, sql, opts, &block)
begin
synchronize(opts[:server]) do |conn|
return execute_prepared_statement(conn, type, sql, opts, &block) if sql.is_a?(Symbol)
log_args = opts[:arguments]
args = {}
opts.fetch(:arguments, {}).each{|k, v| args[k] = prepared_statement_argument(v)}
case type
when :select
log_yield(sql, log_args){conn.query(sql, args, &block)}
when :insert
log_yield(sql, log_args){conn.execute(sql, args)}
conn.last_insert_row_id
when :update
log_yield(sql, log_args){conn.execute_batch(sql, args)}
conn.changes
end
end
rescue SQLite3::Exception => e
raise_error(e)
end
end
# The SQLite adapter does not need the pool to convert exceptions.
# Also, force the max connections to 1 if a memory database is being
# used, as otherwise each connection gets a separate database.
def connection_pool_default_options
o = super.dup
# Default to only a single connection if a memory database is used,
# because otherwise each connection will get a separate database
o[:max_connections] = 1 if @opts[:database] == ':memory:' || blank_object?(@opts[:database])
o
end
def prepared_statement_argument(arg)
case arg
when Date, DateTime, Time
literal(arg)[1...-1]
when SQL::Blob
arg.to_blob
when true, false
if integer_booleans
arg ? 1 : 0
else
literal(arg)[1...-1]
end
else
arg
end
end
# Execute a prepared statement on the database using the given name.
def execute_prepared_statement(conn, type, name, opts, &block)
ps = prepared_statement(name)
sql = ps.prepared_sql
args = opts[:arguments]
ps_args = {}
args.each{|k, v| ps_args[k] = prepared_statement_argument(v)}
if cpsa = conn.prepared_statements[name]
cps, cps_sql = cpsa
if cps_sql != sql
cps.close
cps = nil
end
end
unless cps
cps = log_yield("PREPARE #{name}: #{sql}"){conn.prepare(sql)}
conn.prepared_statements[name] = [cps, sql]
end
log_sql = "EXECUTE #{name}"
if ps.log_sql
log_sql << " ("
log_sql << sql
log_sql << ")"
end
if block
log_yield(log_sql, args){cps.execute(ps_args, &block)}
else
log_yield(log_sql, args){cps.execute!(ps_args){|r|}}
case type
when :insert
conn.last_insert_row_id
when :update
conn.changes
end
end
end
# SQLite3 raises ArgumentError in addition to SQLite3::Exception in
# some cases, such as operations on a closed database.
def database_error_classes
[SQLite3::Exception, ArgumentError]
end
end
# Dataset class for SQLite datasets that use the ruby-sqlite3 driver.
class Dataset < Sequel::Dataset
include ::Sequel::SQLite::DatasetMethods
Database::DatasetClass = self
PREPARED_ARG_PLACEHOLDER = ':'.freeze
# SQLite already supports named bind arguments, so use directly.
module ArgumentMapper
include Sequel::Dataset::ArgumentMapper
protected
# Return a hash with the same values as the given hash,
# but with the keys converted to strings.
def map_to_prepared_args(hash)
args = {}
hash.each{|k,v| args[k.to_s.gsub('.', '__')] = v}
args
end
private
# SQLite uses a : before the name of the argument for named
# arguments.
def prepared_arg(k)
LiteralString.new("#{prepared_arg_placeholder}#{k.to_s.gsub('.', '__')}")
end
# Always assume a prepared argument.
def prepared_arg?(k)
true
end
end
# SQLite prepared statement uses a new prepared statement each time
# it is called, but it does use the bind arguments.
module BindArgumentMethods
include ArgumentMapper
private
# Run execute_select on the database with the given SQL and the stored
# bind arguments.
def execute(sql, opts=OPTS, &block)
super(sql, {:arguments=>bind_arguments}.merge(opts), &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_dui(sql, opts=OPTS, &block)
super(sql, {:arguments=>bind_arguments}.merge(opts), &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_insert(sql, opts=OPTS, &block)
super(sql, {:arguments=>bind_arguments}.merge(opts), &block)
end
end
module PreparedStatementMethods
include BindArgumentMethods
private
# Execute the stored prepared statement name and the stored bind
# arguments instead of the SQL given.
def execute(sql, opts=OPTS, &block)
super(prepared_statement_name, opts, &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_dui(sql, opts=OPTS, &block)
super(prepared_statement_name, opts, &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_insert(sql, opts=OPTS, &block)
super(prepared_statement_name, opts, &block)
end
end
# Execute the given type of statement with the hash of values.
def call(type, bind_vars={}, *values, &block)
ps = to_prepared_statement(type, values)
ps.extend(BindArgumentMethods)
ps.call(bind_vars, &block)
end
# Yield a hash for each row in the dataset.
def fetch_rows(sql)
execute(sql) do |result|
i = -1
cps = db.conversion_procs
type_procs = result.types.map{|t| cps[base_type_name(t)]}
cols = result.columns.map{|c| i+=1; [output_identifier(c), i, type_procs[i]]}
@columns = cols.map{|c| c.first}
result.each do |values|
row = {}
cols.each do |name,id,type_proc|
v = values[id]
if type_proc && v
v = type_proc.call(v)
end
row[name] = v
end
yield row
end
end
end
# Prepare the given type of query with the given name and store
# it in the database. Note that a new native prepared statement is
# created on each call to this prepared statement.
def prepare(type, name=nil, *values)
ps = to_prepared_statement(type, values)
ps.extend(PreparedStatementMethods)
if name
ps.prepared_statement_name = name
db.set_prepared_statement(name, ps)
end
ps
end
private
# The base type name for a given type, without any parenthetical part.
def base_type_name(t)
(t =~ /^(.*?)\(/ ? $1 : t).downcase if t
end
# Quote the string using the adapter class method.
def literal_string_append(sql, v)
sql << "'" << ::SQLite3::Database.quote(v) << "'"
end
# SQLite uses a : before the name of the argument as a placeholder.
def prepared_arg_placeholder
PREPARED_ARG_PLACEHOLDER
end
end
end
end
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