/usr/lib/ruby/vendor_ruby/sequel/adapters/postgres.rb is in ruby-sequel 3.33.0-1.
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begin
require 'pg'
SEQUEL_POSTGRES_USES_PG = true
rescue LoadError => e
SEQUEL_POSTGRES_USES_PG = false
begin
require 'postgres'
# Attempt to get uniform behavior for the PGconn object no matter
# if pg, postgres, or postgres-pr is used.
class PGconn
unless method_defined?(:escape_string)
if self.respond_to?(:escape)
# If there is no escape_string instead method, but there is an
# escape class method, use that instead.
def escape_string(str)
Sequel::Postgres.force_standard_strings ? str.gsub("'", "''") : self.class.escape(str)
end
else
# Raise an error if no valid string escaping method can be found.
def escape_string(obj)
raise Sequel::Error, "string escaping not supported with this postgres driver. Try using ruby-pg, ruby-postgres, or postgres-pr."
end
end
end
unless method_defined?(:escape_bytea)
if self.respond_to?(:escape_bytea)
# If there is no escape_bytea instance method, but there is an
# escape_bytea class method, use that instead.
def escape_bytea(obj)
self.class.escape_bytea(obj)
end
else
begin
require 'postgres-pr/typeconv/conv'
require 'postgres-pr/typeconv/bytea'
extend Postgres::Conversion
# If we are using postgres-pr, use the encode_bytea method from
# that.
def escape_bytea(obj)
self.class.encode_bytea(obj)
end
instance_eval{alias unescape_bytea decode_bytea}
rescue
# If no valid bytea escaping method can be found, create one that
# raises an error
def escape_bytea(obj)
raise Sequel::Error, "bytea escaping not supported with this postgres driver. Try using ruby-pg, ruby-postgres, or postgres-pr."
end
# If no valid bytea unescaping method can be found, create one that
# raises an error
def self.unescape_bytea(obj)
raise Sequel::Error, "bytea unescaping not supported with this postgres driver. Try using ruby-pg, ruby-postgres, or postgres-pr."
end
end
end
end
alias_method :finish, :close unless method_defined?(:finish)
alias_method :async_exec, :exec unless method_defined?(:async_exec)
unless method_defined?(:block)
def block(timeout=nil)
end
end
unless defined?(CONNECTION_OK)
CONNECTION_OK = -1
end
unless method_defined?(:status)
def status
CONNECTION_OK
end
end
end
class PGresult
alias_method :nfields, :num_fields unless method_defined?(:nfields)
alias_method :ntuples, :num_tuples unless method_defined?(:ntuples)
alias_method :ftype, :type unless method_defined?(:ftype)
alias_method :fname, :fieldname unless method_defined?(:fname)
alias_method :cmd_tuples, :cmdtuples unless method_defined?(:cmd_tuples)
end
rescue LoadError
raise e
end
end
module Sequel
Dataset::NON_SQL_OPTIONS << :cursor
module Postgres
CONVERTED_EXCEPTIONS << PGError
NAN = 0.0/0.0
PLUS_INFINITY = 1.0/0.0
MINUS_INFINITY = -1.0/0.0
TYPE_TRANSLATOR = tt = Class.new do
def boolean(s) s == 't' end
def bytea(s) ::Sequel::SQL::Blob.new(Adapter.unescape_bytea(s)) end
def integer(s) s.to_i end
def float(s)
case s
when 'NaN'
NAN
when 'Infinity'
PLUS_INFINITY
when '-Infinity'
MINUS_INFINITY
else
s.to_f
end
end
def date(s) ::Date.new(*s.split("-").map{|x| x.to_i}) end
end.new
# Hash with type name symbols and callable values for converting PostgreSQL types.
# Non-builtin types that don't have fixed numbers should use this to register
# conversion procs.
PG_NAMED_TYPES = {}
# Hash with integer keys and callable values for converting PostgreSQL types.
PG_TYPES = {}
{
[16] => tt.method(:boolean),
[17] => tt.method(:bytea),
[20, 21, 22, 23, 26] => tt.method(:integer),
[700, 701] => tt.method(:float),
[790, 1700] => ::BigDecimal.method(:new),
[1083, 1266] => ::Sequel.method(:string_to_time),
}.each do |k,v|
k.each{|n| PG_TYPES[n] = v}
end
class << self
# As an optimization, Sequel sets the date style to ISO, so that PostgreSQL provides
# the date in a known format that Sequel can parse faster. This can be turned off
# if you require a date style other than ISO.
attr_reader :use_iso_date_format
end
# Modify the type translator for the date type depending on the value given.
def self.use_iso_date_format=(v)
PG_TYPES[1082] = v ? TYPE_TRANSLATOR.method(:date) : Sequel.method(:string_to_date)
@use_iso_date_format = v
end
self.use_iso_date_format = true
# PGconn subclass for connection specific methods used with the
# pg, postgres, or postgres-pr driver.
class Adapter < ::PGconn
DISCONNECT_ERROR_RE = /\Acould not receive data from server: Software caused connection abort/
include Sequel::Postgres::AdapterMethods
self.translate_results = false if respond_to?(:translate_results=)
# Hash of prepared statements for this connection. Keys are
# string names of the server side prepared statement, and values
# are SQL strings.
attr_reader(:prepared_statements) if SEQUEL_POSTGRES_USES_PG
# Apply connection settings for this connection. Current sets
# the date style to ISO in order make Date object creation in ruby faster,
# if Postgres.use_iso_date_format is true.
def apply_connection_settings
super
if Postgres.use_iso_date_format
sql = "SET DateStyle = 'ISO'"
execute(sql)
end
@prepared_statements = {} if SEQUEL_POSTGRES_USES_PG
end
# Raise a Sequel::DatabaseDisconnectError if a PGError is raised and
# the connection status cannot be determined or it is not OK.
def check_disconnect_errors
begin
yield
rescue PGError =>e
disconnect = false
begin
s = status
rescue PGError
disconnect = true
end
status_ok = (s == Adapter::CONNECTION_OK)
disconnect ||= !status_ok
disconnect ||= e.message =~ DISCONNECT_ERROR_RE
disconnect ? raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)) : raise
ensure
block if status_ok
end
end
# Execute the given SQL with this connection. If a block is given,
# yield the results, otherwise, return the number of changed rows.
def execute(sql, args=nil)
q = check_disconnect_errors{@db.log_yield(sql, args){args ? async_exec(sql, args) : async_exec(sql)}}
begin
block_given? ? yield(q) : q.cmd_tuples
ensure
q.clear if q
end
end
private
# Return the requested values for the given row.
def single_value(r)
r.getvalue(0, 0) unless r.nil? || (r.ntuples == 0)
end
end
# Database class for PostgreSQL databases used with Sequel and the
# pg, postgres, or postgres-pr driver.
class Database < Sequel::Database
include Sequel::Postgres::DatabaseMethods
set_adapter_scheme :postgres
# A hash of conversion procs, keyed by type integer (oid) and
# having callable values for the conversion proc for that type.
attr_reader :conversion_procs
# Add the primary_keys and primary_key_sequences instance variables,
# so we can get the correct return values for inserted rows.
def initialize(*args)
super
@primary_keys = {}
@primary_key_sequences = {}
end
# Connects to the database. In addition to the standard database
# options, using the :encoding or :charset option changes the
# client encoding for the connection, :connect_timeout is a
# connection timeout in seconds, and :sslmode sets whether postgres's
# sslmode. :connect_timeout and :ssl_mode are only supported if the pg
# driver is used.
def connect(server)
opts = server_opts(server)
conn = if SEQUEL_POSTGRES_USES_PG
connection_params = {
:host => opts[:host],
:port => opts[:port] || 5432,
:dbname => opts[:database],
:user => opts[:user],
:password => opts[:password],
:connect_timeout => opts[:connect_timeout] || 20,
:sslmode => opts[:sslmode]
}.delete_if { |key, value| blank_object?(value) }
Adapter.connect(connection_params)
else
Adapter.connect(
(opts[:host] unless blank_object?(opts[:host])),
opts[:port] || 5432,
nil, '',
opts[:database],
opts[:user],
opts[:password]
)
end
if encoding = opts[:encoding] || opts[:charset]
if conn.respond_to?(:set_client_encoding)
conn.set_client_encoding(encoding)
else
conn.async_exec("set client_encoding to '#{encoding}'")
end
end
conn.db = self
conn.apply_connection_settings
@conversion_procs ||= get_conversion_procs(conn)
conn
end
# Execute the given SQL with the given args on an available connection.
def execute(sql, opts={}, &block)
check_database_errors do
return execute_prepared_statement(sql, opts, &block) if Symbol === sql
synchronize(opts[:server]){|conn| conn.execute(sql, opts[:arguments], &block)}
end
end
# Insert the values into the table and return the primary key (if
# automatically generated).
def execute_insert(sql, opts={})
return execute(sql, opts) if Symbol === sql
check_database_errors do
synchronize(opts[:server]) do |conn|
conn.execute(sql, opts[:arguments])
insert_result(conn, opts[:table], opts[:values])
end
end
end
if SEQUEL_POSTGRES_USES_PG
# +copy_table+ uses PostgreSQL's +COPY+ SQL statement to return formatted
# results directly to the caller. This method is only supported if pg is the
# underlying ruby driver. This method should only be called if you want
# results returned to the client. If you are using +COPY FROM+ or +COPY TO+
# with a filename, you should just use +run+ instead of this method. This
# method does not currently support +COPY FROM STDIN+, but that may be supported
# in the future.
#
# The table argument supports the following types:
#
# String :: Uses the first argument directly as literal SQL. If you are using
# a version of PostgreSQL before 9.0, you will probably want to
# use a string if you are using any options at all, as the syntax
# Sequel uses for options is only compatible with PostgreSQL 9.0+.
# Dataset :: Uses a query instead of a table name when copying.
# other :: Uses a table name (usually a symbol) when copying.
#
# The following options are respected:
#
# :format :: The format to use. text is the default, so this should be :csv or :binary.
# :options :: An options SQL string to use, which should contain comma separated options.
# :server :: The server on which to run the query.
#
# If a block is provided, the method continually yields to the block, one yield
# per row. If a block is not provided, a single string is returned with all
# of the data.
def copy_table(table, opts={})
sql = if table.is_a?(String)
sql = table
else
if opts[:options] || opts[:format]
options = " ("
options << "FORMAT #{opts[:format]}" if opts[:format]
options << "#{', ' if opts[:format]}#{opts[:options]}" if opts[:options]
options << ')'
end
table = if table.is_a?(::Sequel::Dataset)
"(#{table.sql})"
else
literal(table)
end
sql = "COPY #{table} TO STDOUT#{options}"
end
synchronize(opts[:server]) do |conn|
conn.execute(sql)
begin
if block_given?
while buf = conn.get_copy_data
yield buf
end
nil
else
b = ''
b << buf while buf = conn.get_copy_data
b
end
ensure
raise DatabaseDisconnectError, "disconnecting as a partial COPY may leave the connection in an unusable state" if buf
end
end
end
# Listens on the given channel (or multiple channels if channel is an array), waiting for notifications.
# After a notification is received, or the timeout has passed, stops listening to the channel. Options:
#
# :after_listen :: An object that responds to +call+ that is called with the underlying connection after the LISTEN
# statement is sent, but before the connection starts waiting for notifications.
# :loop :: Whether to continually wait for notifications, instead of just waiting for a single
# notification. If this option is given, a block must be provided. If this object responds to call, it is
# called with the underlying connection after each notification is received (after the block is called).
# If a :timeout option is used, and a callable object is given, the object will also be called if the
# timeout expires. If :loop is used and you want to stop listening, you can either break from inside the
# block given to #listen, or you can throw :stop from inside the :loop object's call method or the block.
# :server :: The server on which to listen, if the sharding support is being used.
# :timeout :: How long to wait for a notification, in seconds (can provide a float value for
# fractional seconds). If not given or nil, waits indefinitely.
#
# This method is only supported if pg is used as the underlying ruby driver. It returns the
# channel the notification was sent to (as a string), unless :loop was used, in which case it returns nil.
# If a block is given, it is yielded 3 arguments:
# * the channel the notification was sent to (as a string)
# * the backend pid of the notifier (as an integer),
# * and the payload of the notification (as a string or nil).
def listen(channels, opts={}, &block)
check_database_errors do
synchronize(opts[:server]) do |conn|
begin
channels = Array(channels)
channels.each{|channel| conn.execute("LISTEN #{channel}")}
opts[:after_listen].call(conn) if opts[:after_listen]
timeout = opts[:timeout] ? [opts[:timeout]] : []
if l = opts[:loop]
raise Error, 'calling #listen with :loop requires a block' unless block
loop_call = l.respond_to?(:call)
catch(:stop) do
loop do
conn.wait_for_notify(*timeout, &block)
l.call(conn) if loop_call
end
end
nil
else
conn.wait_for_notify(*timeout, &block)
end
ensure
conn.execute("UNLISTEN *")
end
end
end
end
end
private
# Convert exceptions raised from the block into DatabaseErrors.
def check_database_errors
begin
yield
rescue => e
raise_error(e, :classes=>CONVERTED_EXCEPTIONS)
end
end
# Disconnect given connection
def disconnect_connection(conn)
begin
conn.finish
rescue PGError
end
end
# Execute the prepared statement with the given name on an available
# connection, using the given args. If the connection has not prepared
# a statement with the given name yet, prepare it. If the connection
# has prepared a statement with the same name and different SQL,
# deallocate that statement first and then prepare this statement.
# If a block is given, yield the result, otherwise, return the number
# of rows changed. If the :insert option is passed, return the value
# of the primary key for the last inserted row.
def execute_prepared_statement(name, opts={})
ps = prepared_statements[name]
sql = ps.prepared_sql
ps_name = name.to_s
args = opts[:arguments]
synchronize(opts[:server]) do |conn|
unless conn.prepared_statements[ps_name] == sql
if conn.prepared_statements.include?(ps_name)
conn.execute("DEALLOCATE #{ps_name}") unless conn.prepared_statements[ps_name] == sql
end
conn.prepared_statements[ps_name] = sql
conn.check_disconnect_errors{log_yield("PREPARE #{ps_name} AS #{sql}"){conn.prepare(ps_name, sql)}}
end
q = conn.check_disconnect_errors{log_yield("EXECUTE #{ps_name}", args){conn.exec_prepared(ps_name, args)}}
if opts[:table] && opts[:values]
insert_result(conn, opts[:table], opts[:values])
else
begin
block_given? ? yield(q) : q.cmd_tuples
ensure
q.clear
end
end
end
end
# Return the conversion procs hash to use for this database
def get_conversion_procs(conn)
procs = PG_TYPES.dup
procs[1114] = method(:to_application_timestamp)
procs[1184] = method(:to_application_timestamp)
conn.execute("SELECT oid, typname FROM pg_type where typtype = 'b'") do |res|
res.ntuples.times do |recnum|
if pr = PG_NAMED_TYPES[res.getvalue(recnum, 1).untaint.to_sym]
procs[res.getvalue(recnum, 0).to_i] ||= pr
end
end
end
procs
end
end
# Dataset class for PostgreSQL datasets that use the pg, postgres, or
# postgres-pr driver.
class Dataset < Sequel::Dataset
include Sequel::Postgres::DatasetMethods
Database::DatasetClass = self
# Yield all rows returned by executing the given SQL and converting
# the types.
def fetch_rows(sql, &block)
return cursor_fetch_rows(sql, &block) if @opts[:cursor]
execute(sql){|res| yield_hash_rows(res, fetch_rows_set_cols(res), &block)}
end
# Uses a cursor for fetching records, instead of fetching the entire result
# set at once. Can be used to process large datasets without holding
# all rows in memory (which is what the underlying drivers do
# by default). Options:
#
# * :rows_per_fetch - the number of rows per fetch (default 1000). Higher
# numbers result in fewer queries but greater memory use.
#
# Usage:
#
# DB[:huge_table].use_cursor.each{|row| p row}
# DB[:huge_table].use_cursor(:rows_per_fetch=>10000).each{|row| p row}
#
# This is untested with the prepared statement/bound variable support,
# and unlikely to work with either.
def use_cursor(opts={})
clone(:cursor=>{:rows_per_fetch=>1000}.merge(opts))
end
if SEQUEL_POSTGRES_USES_PG
PREPARED_ARG_PLACEHOLDER = LiteralString.new('$').freeze
# PostgreSQL specific argument mapper used for mapping the named
# argument hash to a array with numbered arguments. Only used with
# the pg driver.
module ArgumentMapper
include Sequel::Dataset::ArgumentMapper
protected
# An array of bound variable values for this query, in the correct order.
def map_to_prepared_args(hash)
prepared_args.map{|k| hash[k.to_sym]}
end
private
# PostgreSQL most of the time requires type information for each of
# arguments to a prepared statement. Handle this by allowing the
# named argument to have a __* suffix, with the * being the type.
# In the generated SQL, cast the bound argument to that type to
# elminate ambiguity (and PostgreSQL from raising an exception).
def prepared_arg(k)
y, type = k.to_s.split("__")
if i = prepared_args.index(y)
i += 1
else
prepared_args << y
i = prepared_args.length
end
LiteralString.new("#{prepared_arg_placeholder}#{i}#{"::#{type}" if type}")
end
# Always assume a prepared argument.
def prepared_arg?(k)
true
end
end
# Allow use of bind arguments for PostgreSQL using the pg driver.
module BindArgumentMethods
include ArgumentMapper
include ::Sequel::Postgres::DatasetMethods::PreparedStatementMethods
private
# Execute the given SQL with the stored bind arguments.
def execute(sql, 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={}, &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={}, &block)
super(sql, {:arguments=>bind_arguments}.merge(opts), &block)
end
end
# Allow use of server side prepared statements for PostgreSQL using the
# pg driver.
module PreparedStatementMethods
include BindArgumentMethods
# Raise a more obvious error if you attempt to call a unnamed prepared statement.
def call(*)
raise Error, "Cannot call prepared statement without a name" if prepared_statement_name.nil?
super
end
private
# Execute the stored prepared statement name and the stored bind
# arguments instead of the SQL given.
def execute(sql, 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={}, &block)
super(prepared_statement_name, opts, &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_insert(sql, 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
# Prepare the given type of statement with the given name, and store
# it in the database to be called later.
def prepare(type, name=nil, *values)
ps = to_prepared_statement(type, values)
ps.extend(PreparedStatementMethods)
if name
ps.prepared_statement_name = name
db.prepared_statements[name] = ps
end
ps
end
private
# PostgreSQL uses $N for placeholders instead of ?, so use a $
# as the placeholder.
def prepared_arg_placeholder
PREPARED_ARG_PLACEHOLDER
end
end
private
# Use a cursor to fetch groups of records at a time, yielding them to the block.
def cursor_fetch_rows(sql, &block)
server_opts = {:server=>@opts[:server] || :read_only}
db.transaction(server_opts) do
begin
execute_ddl("DECLARE sequel_cursor NO SCROLL CURSOR WITHOUT HOLD FOR #{sql}", server_opts)
rows_per_fetch = @opts[:cursor][:rows_per_fetch].to_i
rows_per_fetch = 1000 if rows_per_fetch <= 0
fetch_sql = "FETCH FORWARD #{rows_per_fetch} FROM sequel_cursor"
cols = nil
# Load columns only in the first fetch, so subsequent fetches are faster
execute(fetch_sql) do |res|
cols = fetch_rows_set_cols(res)
yield_hash_rows(res, cols, &block)
return if res.ntuples < rows_per_fetch
end
loop do
execute(fetch_sql) do |res|
yield_hash_rows(res, cols, &block)
return if res.ntuples < rows_per_fetch
end
end
ensure
execute_ddl("CLOSE sequel_cursor", server_opts)
end
end
end
# Set the @columns based on the result set, and return the array of
# field numers, type conversion procs, and name symbol arrays.
def fetch_rows_set_cols(res)
cols = []
procs = db.conversion_procs
res.nfields.times do |fieldnum|
cols << [fieldnum, procs[res.ftype(fieldnum)], output_identifier(res.fname(fieldnum))]
end
@columns = cols.map{|c| c.at(2)}
cols
end
# Use the driver's escape_bytea
def literal_blob_append(sql, v)
sql << "'" << db.synchronize{|c| c.escape_bytea(v)} << "'"
end
# Use the driver's escape_string
def literal_string_append(sql, v)
sql << "'" << db.synchronize{|c| c.escape_string(v)} << "'"
end
# For each row in the result set, yield a hash with column name symbol
# keys and typecasted values.
def yield_hash_rows(res, cols)
res.ntuples.times do |recnum|
converted_rec = {}
cols.each do |fieldnum, type_proc, fieldsym|
value = res.getvalue(recnum, fieldnum)
converted_rec[fieldsym] = (value && type_proc) ? type_proc.call(value) : value
end
yield converted_rec
end
end
end
end
end
if SEQUEL_POSTGRES_USES_PG
begin
require 'sequel_pg'
rescue LoadError
if RUBY_PLATFORM =~ /mingw|mswin/
begin
require "#{RUBY_VERSION[0...3]}/sequel_pg"
rescue LoadError
end
end
end
end
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