/usr/lib/ruby/vendor_ruby/sequel/database/misc.rb is in ruby-sequel 4.1.1-1.
This file is owned by root:root, with mode 0o644.
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class Database
# ---------------------
# :section: 7 - Miscellaneous methods
# These methods don't fit neatly into another category.
# ---------------------
# Hash of extension name symbols to callable objects to load the extension
# into the Database object (usually by extending it with a module defined
# in the extension).
EXTENSIONS = {}
# The general default size for string columns for all Sequel::Database
# instances.
DEFAULT_STRING_COLUMN_SIZE = 255
# Empty exception regexp to class map, used by default if Sequel doesn't
# have specific support for the database in use.
DEFAULT_DATABASE_ERROR_REGEXPS = {}.freeze
# Mapping of schema type symbols to class or arrays of classes for that
# symbol.
SCHEMA_TYPE_CLASSES = {:string=>String, :integer=>Integer, :date=>Date, :datetime=>[Time, DateTime].freeze,
:time=>Sequel::SQLTime, :boolean=>[TrueClass, FalseClass].freeze, :float=>Float, :decimal=>BigDecimal,
:blob=>Sequel::SQL::Blob}.freeze
# Module to be included in shared adapters so that when the DatabaseMethods are
# included in the database, the identifier mangling defaults are reset correctly.
module ResetIdentifierMangling
def extended(obj)
obj.send(:reset_identifier_mangling)
end
end
# Nested hook Proc; each new hook Proc just wraps the previous one.
@initialize_hook = Proc.new {|db| }
# Register a hook that will be run when a new Database is instantiated. It is
# called with the new database handle.
def self.after_initialize(&block)
raise Error, "must provide block to after_initialize" unless block
Sequel.synchronize do
previous = @initialize_hook
@initialize_hook = Proc.new do |db|
previous.call(db)
block.call(db)
end
end
end
# Apply an extension to all Database objects created in the future.
def self.extension(*extensions)
after_initialize{|db| db.extension(*extensions)}
end
# Register an extension callback for Database objects. ext should be the
# extension name symbol, and mod should either be a Module that the
# database is extended with, or a callable object called with the database
# object. If mod is not provided, a block can be provided and is treated
# as the mod object.
def self.register_extension(ext, mod=nil, &block)
if mod
raise(Error, "cannot provide both mod and block to Database.register_extension") if block
if mod.is_a?(Module)
block = proc{|db| db.extend(mod)}
else
block = mod
end
end
Sequel.synchronize{EXTENSIONS[ext] = block}
end
# Run the after_initialize hook for the given +instance+.
def self.run_after_initialize(instance)
@initialize_hook.call(instance)
end
# Converts a uri to an options hash. These options are then passed
# to a newly created database object.
def self.uri_to_options(uri)
{ :user => uri.user,
:password => uri.password,
:host => uri.host,
:port => uri.port,
:database => (m = /\/(.*)/.match(uri.path)) && (m[1]) }
end
private_class_method :uri_to_options
# The options hash for this database
attr_reader :opts
# Set the timezone to use for this database, overridding <tt>Sequel.database_timezone</tt>.
attr_writer :timezone
# The specific default size of string columns for this Sequel::Database, usually 255 by default.
attr_accessor :default_string_column_size
# Constructs a new instance of a database connection with the specified
# options hash.
#
# Accepts the following options:
# :default_string_column_size :: The default size of string columns, 255 by default.
# :identifier_input_method :: A string method symbol to call on identifiers going into the database
# :identifier_output_method :: A string method symbol to call on identifiers coming from the database
# :logger :: A specific logger to use
# :loggers :: An array of loggers to use
# :quote_identifiers :: Whether to quote identifiers
# :servers :: A hash specifying a server/shard specific options, keyed by shard symbol
# :single_threaded :: Whether to use a single-threaded connection pool
# :sql_log_level :: Method to use to log SQL to a logger, :info by default.
#
# All options given are also passed to the connection pool.
def initialize(opts = OPTS, &block)
@opts ||= opts
@opts = connection_pool_default_options.merge(@opts)
@loggers = Array(@opts[:logger]) + Array(@opts[:loggers])
self.log_warn_duration = @opts[:log_warn_duration]
block ||= proc{|server| connect(server)}
@opts[:servers] = {} if @opts[:servers].is_a?(String)
@opts[:adapter_class] = self.class
@opts[:single_threaded] = @single_threaded = typecast_value_boolean(@opts.fetch(:single_threaded, Database.single_threaded))
@schemas = {}
@default_string_column_size = @opts[:default_string_column_size] || DEFAULT_STRING_COLUMN_SIZE
@prepared_statements = {}
@transactions = {}
@identifier_input_method = nil
@identifier_output_method = nil
@quote_identifiers = nil
@timezone = nil
@dataset_class = dataset_class_default
@cache_schema = typecast_value_boolean(@opts.fetch(:cache_schema, true))
@dataset_modules = []
@schema_type_classes = SCHEMA_TYPE_CLASSES.dup
self.sql_log_level = @opts[:sql_log_level] ? @opts[:sql_log_level].to_sym : :info
@pool = ConnectionPool.get_pool(self, @opts)
reset_identifier_mangling
adapter_initialize
unless typecast_value_boolean(@opts[:keep_reference]) == false
Sequel.synchronize{::Sequel::DATABASES.push(self)}
end
Sequel::Database.run_after_initialize(self)
end
# If a transaction is not currently in process, yield to the block immediately.
# Otherwise, add the block to the list of blocks to call after the currently
# in progress transaction commits (and only if it commits).
# Options:
# :server :: The server/shard to use.
def after_commit(opts=OPTS, &block)
raise Error, "must provide block to after_commit" unless block
synchronize(opts[:server]) do |conn|
if h = _trans(conn)
raise Error, "cannot call after_commit in a prepared transaction" if h[:prepare]
(h[:after_commit] ||= []) << block
else
yield
end
end
end
# If a transaction is not currently in progress, ignore the block.
# Otherwise, add the block to the list of the blocks to call after the currently
# in progress transaction rolls back (and only if it rolls back).
# Options:
# :server :: The server/shard to use.
def after_rollback(opts=OPTS, &block)
raise Error, "must provide block to after_rollback" unless block
synchronize(opts[:server]) do |conn|
if h = _trans(conn)
raise Error, "cannot call after_rollback in a prepared transaction" if h[:prepare]
(h[:after_rollback] ||= []) << block
end
end
end
# Cast the given type to a literal type
#
# DB.cast_type_literal(Float) # double precision
# DB.cast_type_literal(:foo) # foo
def cast_type_literal(type)
type_literal(:type=>type)
end
# Load an extension into the receiver. In addition to requiring the extension file, this
# also modifies the database to work with the extension (usually extending it with a
# module defined in the extension file). If no related extension file exists or the
# extension does not have specific support for Database objects, an Error will be raised.
# Returns self.
def extension(*exts)
Sequel.extension(*exts)
exts.each do |ext|
if pr = Sequel.synchronize{EXTENSIONS[ext]}
pr.call(self)
else
raise(Error, "Extension #{ext} does not have specific support handling individual databases")
end
end
self
end
# Convert the given timestamp from the application's timezone,
# to the databases's timezone or the default database timezone if
# the database does not have a timezone.
def from_application_timestamp(v)
Sequel.convert_output_timestamp(v, timezone)
end
# Return true if already in a transaction given the options,
# false otherwise. Respects the :server option for selecting
# a shard.
def in_transaction?(opts=OPTS)
synchronize(opts[:server]){|conn| !!_trans(conn)}
end
# Returns a string representation of the database object including the
# class name and connection URI and options used when connecting (if any).
def inspect
a = []
a << uri.inspect if uri
if (oo = opts[:orig_opts]) && !oo.empty?
a << oo.inspect
end
"#<#{self.class}: #{a.join(' ')}>"
end
# Proxy the literal call to the dataset.
#
# DB.literal(1) # 1
# DB.literal(:a) # a
# DB.literal('a') # 'a'
def literal(v)
schema_utility_dataset.literal(v)
end
# Synchronize access to the prepared statements cache.
def prepared_statement(name)
Sequel.synchronize{prepared_statements[name]}
end
# Proxy the quote_identifier method to the dataset,
# useful for quoting unqualified identifiers for use
# outside of datasets.
def quote_identifier(v)
schema_utility_dataset.quote_identifier(v)
end
# Return ruby class or array of classes for the given type symbol.
def schema_type_class(type)
@schema_type_classes[type]
end
# Default serial primary key options, used by the table creation
# code.
def serial_primary_key_options
{:primary_key => true, :type => Integer, :auto_increment => true}
end
# Cache the prepared statement object at the given name.
def set_prepared_statement(name, ps)
ps.prepared_sql
Sequel.synchronize{prepared_statements[name] = ps}
end
# The timezone to use for this database, defaulting to <tt>Sequel.database_timezone</tt>.
def timezone
@timezone || Sequel.database_timezone
end
# Convert the given timestamp to the application's timezone,
# from the databases's timezone or the default database timezone if
# the database does not have a timezone.
def to_application_timestamp(v)
Sequel.convert_timestamp(v, timezone)
end
# Typecast the value to the given column_type. Calls
# typecast_value_#{column_type} if the method exists,
# otherwise returns the value.
# This method should raise Sequel::InvalidValue if assigned value
# is invalid.
def typecast_value(column_type, value)
return nil if value.nil?
meth = "typecast_value_#{column_type}"
begin
respond_to?(meth, true) ? send(meth, value) : value
rescue ArgumentError, TypeError => e
raise Sequel.convert_exception_class(e, InvalidValue)
end
end
# Returns the URI use to connect to the database. If a URI
# was not used when connecting, returns nil.
def uri
opts[:uri]
end
# Explicit alias of uri for easier subclassing.
def url
uri
end
private
# Per adapter initialization method, empty by default.
def adapter_initialize
end
# Returns true when the object is considered blank.
# The only objects that are blank are nil, false,
# strings with all whitespace, and ones that respond
# true to empty?
def blank_object?(obj)
return obj.blank? if obj.respond_to?(:blank?)
case obj
when NilClass, FalseClass
true
when Numeric, TrueClass
false
when String
obj.strip.empty?
else
obj.respond_to?(:empty?) ? obj.empty? : false
end
end
# Which transaction errors to translate, blank by default.
def database_error_classes
[]
end
# An enumerable yielding pairs of regexps and exception classes, used
# to match against underlying driver exception messages in
# order to raise a more specific Sequel::DatabaseError subclass.
def database_error_regexps
DEFAULT_DATABASE_ERROR_REGEXPS
end
# Return the Sequel::DatabaseError subclass to wrap the given
# exception in.
def database_error_class(exception, opts)
database_specific_error_class(exception, opts) || DatabaseError
end
# Return the SQLState for the given exception, if one can be
# determined
def database_exception_sqlstate(exception, opts)
nil
end
# Return a specific Sequel::DatabaseError exception class if
# one is appropriate for the underlying exception,
# or nil if there is no specific exception class.
def database_specific_error_class(exception, opts)
return DatabaseDisconnectError if disconnect_error?(exception, opts)
if sqlstate = database_exception_sqlstate(exception, opts)
if klass = database_specific_error_class_from_sqlstate(sqlstate)
return klass
end
else
database_error_regexps.each do |regexp, klss|
return klss if exception.message =~ regexp
end
end
nil
end
NOT_NULL_CONSTRAINT_SQLSTATES = %w'23502'.freeze.each{|s| s.freeze}
FOREIGN_KEY_CONSTRAINT_SQLSTATES = %w'23503 23506 23504'.freeze.each{|s| s.freeze}
UNIQUE_CONSTRAINT_SQLSTATES = %w'23505'.freeze.each{|s| s.freeze}
CHECK_CONSTRAINT_SQLSTATES = %w'23513 23514'.freeze.each{|s| s.freeze}
SERIALIZATION_CONSTRAINT_SQLSTATES = %w'40001'.freeze.each{|s| s.freeze}
# Given the SQLState, return the appropriate DatabaseError subclass.
def database_specific_error_class_from_sqlstate(sqlstate)
case sqlstate
when *NOT_NULL_CONSTRAINT_SQLSTATES
NotNullConstraintViolation
when *FOREIGN_KEY_CONSTRAINT_SQLSTATES
ForeignKeyConstraintViolation
when *UNIQUE_CONSTRAINT_SQLSTATES
UniqueConstraintViolation
when *CHECK_CONSTRAINT_SQLSTATES
CheckConstraintViolation
when *SERIALIZATION_CONSTRAINT_SQLSTATES
SerializationFailure
end
end
# Return true if exception represents a disconnect error, false otherwise.
def disconnect_error?(exception, opts)
opts[:disconnect]
end
# Convert the given exception to an appropriate Sequel::DatabaseError
# subclass, keeping message and traceback.
def raise_error(exception, opts=OPTS)
if !opts[:classes] || Array(opts[:classes]).any?{|c| exception.is_a?(c)}
raise Sequel.convert_exception_class(exception, database_error_class(exception, opts))
else
raise exception
end
end
# Typecast the value to an SQL::Blob
def typecast_value_blob(value)
value.is_a?(Sequel::SQL::Blob) ? value : Sequel::SQL::Blob.new(value)
end
# Typecast the value to true, false, or nil
def typecast_value_boolean(value)
case value
when false, 0, "0", /\Af(alse)?\z/i, /\Ano?\z/i
false
else
blank_object?(value) ? nil : true
end
end
# Typecast the value to a Date
def typecast_value_date(value)
case value
when DateTime, Time
Date.new(value.year, value.month, value.day)
when Date
value
when String
Sequel.string_to_date(value)
when Hash
Date.new(*[:year, :month, :day].map{|x| (value[x] || value[x.to_s]).to_i})
else
raise InvalidValue, "invalid value for Date: #{value.inspect}"
end
end
# Typecast the value to a DateTime or Time depending on Sequel.datetime_class
def typecast_value_datetime(value)
Sequel.typecast_to_application_timestamp(value)
end
# Typecast the value to a BigDecimal
def typecast_value_decimal(value)
case value
when BigDecimal
value
when Numeric
BigDecimal.new(value.to_s)
when String
d = BigDecimal.new(value)
if d.zero?
# BigDecimal parsing is loose by default, returning a 0 value for
# invalid input. If a zero value is received, use Float to check
# for validity.
begin
Float(value)
rescue ArgumentError
raise InvalidValue, "invalid value for BigDecimal: #{value.inspect}"
end
end
d
else
raise InvalidValue, "invalid value for BigDecimal: #{value.inspect}"
end
end
# Typecast the value to a Float
def typecast_value_float(value)
Float(value)
end
# Used for checking/removing leading zeroes from strings so they don't get
# interpreted as octal.
LEADING_ZERO_RE = /\A0+(\d)/.freeze
if RUBY_VERSION >= '1.9'
# Typecast the value to an Integer
def typecast_value_integer(value)
(value.is_a?(String) && value =~ LEADING_ZERO_RE) ? Integer(value, 10) : Integer(value)
end
else
# :nocov:
# Replacement string when replacing leading zeroes.
LEADING_ZERO_REP = "\\1".freeze
# Typecast the value to an Integer
def typecast_value_integer(value)
Integer(value.is_a?(String) ? value.sub(LEADING_ZERO_RE, LEADING_ZERO_REP) : value)
end
# :nocov:
end
# Typecast the value to a String
def typecast_value_string(value)
case value
when Hash, Array
raise Sequel::InvalidValue, "invalid value for String: #{value.inspect}"
else
value.to_s
end
end
# Typecast the value to a Time
def typecast_value_time(value)
case value
when Time
if value.is_a?(SQLTime)
value
else
# specifically check for nsec == 0 value to work around JRuby 1.6 ruby 1.9 mode bug
SQLTime.create(value.hour, value.min, value.sec, (value.respond_to?(:nsec) && value.nsec != 0) ? value.nsec/1000.0 : value.usec)
end
when String
Sequel.string_to_time(value)
when Hash
SQLTime.create(*[:hour, :minute, :second].map{|x| (value[x] || value[x.to_s]).to_i})
else
raise Sequel::InvalidValue, "invalid value for Time: #{value.inspect}"
end
end
end
end
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