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module ActiveRecord
module ConnectionAdapters
class PostgreSQLAdapter < AbstractAdapter
module Quoting
# Escapes binary strings for bytea input to the database.
def escape_bytea(value)
PGconn.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)
PGconn.unescape_bytea(value) if value
end
# Quotes PostgreSQL-specific data types for SQL input.
def quote(value, column = nil) #:nodoc:
return super unless column
case value
when Hash
case column.sql_type
when 'hstore' then super(PostgreSQLColumn.hstore_to_string(value), column)
when 'json' then super(PostgreSQLColumn.json_to_string(value), column)
else super
end
when IPAddr
case column.sql_type
when 'inet', 'cidr' then super(PostgreSQLColumn.cidr_to_string(value), column)
else super
end
when Float
if value.infinite? && column.type == :datetime
"'#{value.to_s.downcase}'"
elsif value.infinite? || value.nan?
"'#{value.to_s}'"
else
super
end
when Numeric
return super unless column.sql_type == 'money'
# Not truly string input, so doesn't require (or allow) escape string syntax.
"'#{value}'"
when String
case column.sql_type
when 'bytea' then "'#{escape_bytea(value)}'"
when 'xml' then "xml '#{quote_string(value)}'"
when /^bit/
case value
when /^[01]*$/ then "B'#{value}'" # Bit-string notation
when /^[0-9A-F]*$/i then "X'#{value}'" # Hexadecimal notation
end
else
super
end
else
super
end
end
def type_cast(value, column)
return super unless column
case value
when String
return super unless 'bytea' == column.sql_type
{ :value => value, :format => 1 }
when Hash
case column.sql_type
when 'hstore' then PostgreSQLColumn.hstore_to_string(value)
when 'json' then PostgreSQLColumn.json_to_string(value)
else super
end
when IPAddr
return super unless ['inet','cidr'].includes? column.sql_type
PostgreSQLColumn.cidr_to_string(value)
else
super
end
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)
schema, name_part = extract_pg_identifier_from_name(name.to_s)
unless name_part
quote_column_name(schema)
else
table_name, name_part = extract_pg_identifier_from_name(name_part)
"#{quote_column_name(schema)}.#{quote_column_name(table_name)}"
end
end
# Quotes column names for use in SQL queries.
def quote_column_name(name) #:nodoc:
PGconn.quote_ident(name.to_s)
end
# Quote date/time values for use in SQL input. Includes microseconds
# if the value is a Time responding to usec.
def quoted_date(value) #:nodoc:
if value.acts_like?(:time) && value.respond_to?(:usec)
"#{super}.#{sprintf("%06d", value.usec)}"
else
super
end
end
end
end
end
end
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