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module ActiveRecord
module ConnectionAdapters
module PostgreSQL
module Quoting
# Escapes binary strings for bytea input to the database.
def escape_bytea(value)
@connection.escape_bytea(value) if value
end
# Unescapes bytea output from a database to the binary string it represents.
# NOTE: This is NOT an inverse of escape_bytea! This is only to be used
# on escaped binary output from database drive.
def unescape_bytea(value)
@connection.unescape_bytea(value) if value
end
# Quotes strings for use in SQL input.
def quote_string(s) #:nodoc:
@connection.escape(s)
end
# Checks the following cases:
#
# - table_name
# - "table.name"
# - schema_name.table_name
# - schema_name."table.name"
# - "schema.name".table_name
# - "schema.name"."table.name"
def quote_table_name(name) # :nodoc:
@quoted_table_names[name] ||= Utils.extract_schema_qualified_name(name.to_s).quoted.freeze
end
# Quotes schema names for use in SQL queries.
def quote_schema_name(name)
PG::Connection.quote_ident(name)
end
def quote_table_name_for_assignment(table, attr)
quote_column_name(attr)
end
# Quotes column names for use in SQL queries.
def quote_column_name(name) # :nodoc:
@quoted_column_names[name] ||= PG::Connection.quote_ident(super).freeze
end
# Quote date/time values for use in SQL input.
def quoted_date(value) #:nodoc:
if value.year <= 0
bce_year = format("%04d", -value.year + 1)
super.sub(/^-?\d+/, bce_year) + " BC"
else
super
end
end
def quoted_binary(value) # :nodoc:
"'#{escape_bytea(value.to_s)}'"
end
def quote_default_expression(value, column) # :nodoc:
if value.is_a?(Proc)
value.call
elsif column.type == :uuid && /\(\)/.match?(value)
value # Does not quote function default values for UUID columns
elsif column.respond_to?(:array?)
value = type_cast_from_column(column, value)
quote(value)
else
super
end
end
def lookup_cast_type_from_column(column) # :nodoc:
type_map.lookup(column.oid, column.fmod, column.sql_type)
end
private
def lookup_cast_type(sql_type)
super(query_value("SELECT #{quote(sql_type)}::regtype::oid", "SCHEMA").to_i)
end
def _quote(value)
case value
when OID::Xml::Data
"xml '#{quote_string(value.to_s)}'"
when OID::Bit::Data
if value.binary?
"B'#{value}'"
elsif value.hex?
"X'#{value}'"
end
when Float
if value.infinite? || value.nan?
"'#{value}'"
else
super
end
when OID::Array::Data
_quote(encode_array(value))
else
super
end
end
def _type_cast(value)
case value
when Type::Binary::Data
# Return a bind param hash with format as binary.
# See https://deveiate.org/code/pg/PG/Connection.html#method-i-exec_prepared-doc
# for more information
{ value: value.to_s, format: 1 }
when OID::Xml::Data, OID::Bit::Data
value.to_s
when OID::Array::Data
encode_array(value)
else
super
end
end
def encode_array(array_data)
encoder = array_data.encoder
values = type_cast_array(array_data.values)
result = encoder.encode(values)
if encoding = determine_encoding_of_strings_in_array(values)
result.force_encoding(encoding)
end
result
end
def determine_encoding_of_strings_in_array(value)
case value
when ::Array then determine_encoding_of_strings_in_array(value.first)
when ::String then value.encoding
end
end
def type_cast_array(values)
case values
when ::Array then values.map { |item| type_cast_array(item) }
else _type_cast(values)
end
end
end
end
end
end
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