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adapter.rb
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adapter.rb
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# frozen_string_literal: true
ArJdbc.load_java_part :PostgreSQL
require 'ipaddr'
require 'active_record/connection_adapters/abstract_adapter'
require 'active_record/connection_adapters/postgresql/column'
require 'active_record/connection_adapters/postgresql/explain_pretty_printer'
require 'active_record/connection_adapters/postgresql/quoting'
require 'active_record/connection_adapters/postgresql/referential_integrity'
require 'active_record/connection_adapters/postgresql/schema_creation'
require 'active_record/connection_adapters/postgresql/schema_definitions'
require 'active_record/connection_adapters/postgresql/schema_dumper'
require 'active_record/connection_adapters/postgresql/schema_statements'
require 'active_record/connection_adapters/postgresql/type_metadata'
require 'active_record/connection_adapters/postgresql/utils'
require 'arjdbc/abstract/core'
require 'arjdbc/abstract/connection_management'
require 'arjdbc/abstract/database_statements'
require 'arjdbc/abstract/statement_cache'
require 'arjdbc/abstract/transaction_support'
require 'arjdbc/postgresql/base/array_decoder'
require 'arjdbc/postgresql/base/array_encoder'
require 'arjdbc/postgresql/name'
require 'arjdbc/postgresql/schema_statements'
require 'active_model'
module ArJdbc
# Strives to provide Rails built-in PostgreSQL adapter (API) compatibility.
module PostgreSQL
require 'arjdbc/postgresql/column'
require 'arel/visitors/postgresql_jdbc'
# @private
IndexDefinition = ::ActiveRecord::ConnectionAdapters::IndexDefinition
# @private
Type = ::ActiveRecord::Type
# @see ActiveRecord::ConnectionAdapters::JdbcAdapter#jdbc_column_class
def jdbc_column_class; ::ActiveRecord::ConnectionAdapters::PostgreSQLColumn end
ADAPTER_NAME = 'PostgreSQL'
def adapter_name
ADAPTER_NAME
end
def redshift?
# SELECT version() :
# PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.647
if (redshift = @config[:redshift]).nil?
redshift = !! (valid_raw_connection.database_product || '').index('Redshift')
end
redshift
end
private :redshift?
def set_client_encoding(encoding)
ActiveRecord::Base.logger.warn "client_encoding is set by the driver and should not be altered, ('#{encoding}' ignored)"
ActiveRecord::Base.logger.debug "Set the 'allowEncodingChanges' driver property (e.g. using config[:properties]) if you need to override the client encoding when doing a copy."
end
# Configures the encoding, verbosity, schema search path, and time zone of the connection.
# This is called on `connection.connect` and should not be called manually.
def configure_connection
#if encoding = config[:encoding]
# The client_encoding setting is set by the driver and should not be altered.
# If the driver detects a change it will abort the connection.
# see http://jdbc.postgresql.org/documentation/91/connect.html
# self.set_client_encoding(encoding)
#end
self.client_min_messages = @config[:min_messages] || 'warning'
self.schema_search_path = @config[:schema_search_path] || @config[:schema_order]
# Use standard-conforming strings if available so we don't have to do the E'...' dance.
set_standard_conforming_strings
# If using Active Record's time zone support configure the connection to return
# TIMESTAMP WITH ZONE types in UTC.
# (SET TIME ZONE does not use an equals sign like other SET variables)
if ActiveRecord.default_timezone == :utc
execute("SET time zone 'UTC'", 'SCHEMA')
elsif tz = local_tz
execute("SET time zone '#{tz}'", 'SCHEMA')
end unless redshift?
# Set interval output format to ISO 8601 for ease of parsing by ActiveSupport::Duration.parse
execute("SET intervalstyle = iso_8601", "SCHEMA")
# SET statements from :variables config hash
# http://www.postgresql.org/docs/8.3/static/sql-set.html
(@config[:variables] || {}).map do |k, v|
if v == ':default' || v == :default
# Sets the value to the global or compile default
execute("SET SESSION #{k} TO DEFAULT", 'SCHEMA')
elsif ! v.nil?
execute("SET SESSION #{k} TO #{quote(v)}", 'SCHEMA')
end
end
reload_type_map
end
# @private
ActiveRecordError = ::ActiveRecord::ActiveRecordError
NATIVE_DATABASE_TYPES = {
primary_key: 'bigserial primary key',
bigint: { name: 'bigint' },
binary: { name: 'bytea' },
bit: { name: 'bit' },
bit_varying: { name: 'bit varying' },
boolean: { name: 'boolean' },
box: { name: 'box' },
char: { name: 'char' },
cidr: { name: 'cidr' },
circle: { name: 'circle' },
citext: { name: 'citext' },
date: { name: 'date' },
daterange: { name: 'daterange' },
datetime: { name: 'timestamp' },
decimal: { name: 'decimal' }, # :limit => 1000
float: { name: 'float' },
hstore: { name: 'hstore' },
inet: { name: 'inet' },
int4range: { name: 'int4range' },
int8range: { name: 'int8range' },
integer: { name: 'integer', limit: 4 },
interval: { name: 'interval' },
json: { name: 'json' },
jsonb: { name: 'jsonb' },
line: { name: 'line' },
lseg: { name: 'lseg' },
ltree: { name: 'ltree' },
macaddr: { name: 'macaddr' },
money: { name: 'money' },
numeric: { name: 'numeric' },
numrange: { name: 'numrange' },
oid: { name: 'oid' },
path: { name: 'path' },
point: { name: 'point' },
polygon: { name: 'polygon' },
string: { name: 'character varying' },
text: { name: 'text' },
time: { name: 'time' },
timestamp: { name: 'timestamp' },
tsrange: { name: 'tsrange' },
tstzrange: { name: 'tstzrange' },
tsvector: { name: 'tsvector' },
uuid: { name: 'uuid' },
xml: { name: 'xml' }
}
def native_database_types
NATIVE_DATABASE_TYPES
end
def valid_type?(type)
!native_database_types[type].nil?
end
def set_standard_conforming_strings
execute("SET standard_conforming_strings = on", "SCHEMA")
end
def supports_bulk_alter?
true
end
def supports_index_sort_order?
true
end
def supports_partitioned_indexes?
database_version >= 110_000
end
def supports_partial_index?
true
end
def supports_expression_index?
true
end
def supports_transaction_isolation?
true
end
def supports_foreign_keys?
true
end
def supports_check_constraints?
true
end
def supports_validate_constraints?
true
end
def supports_views?
true
end
def supports_datetime_with_precision?
true
end
def supports_json?
database_version >= 90200
end
def supports_comments?
true
end
def supports_savepoints?
true
end
def supports_insert_returning?
true
end
def supports_insert_on_conflict?
database_version >= 90500
end
alias supports_insert_on_duplicate_skip? supports_insert_on_conflict?
alias supports_insert_on_duplicate_update? supports_insert_on_conflict?
alias supports_insert_conflict_target? supports_insert_on_conflict?
def supports_identity_columns? # :nodoc:
database_version >= 10_00_00 # >= 10.0
end
def index_algorithms
{ concurrently: 'CONCURRENTLY' }
end
def supports_ddl_transactions?
true
end
def supports_advisory_locks?
true
end
def supports_explain?
true
end
def supports_extensions?
database_version >= 90200
end
def supports_ranges?
database_version >= 90200
end
def supports_materialized_views?
database_version >= 90300
end
def supports_foreign_tables?
database_version >= 90300
end
def supports_pgcrypto_uuid?
database_version >= 90400
end
def supports_optimizer_hints?
unless defined?(@has_pg_hint_plan)
@has_pg_hint_plan = extension_available?("pg_hint_plan")
end
@has_pg_hint_plan
end
def supports_common_table_expressions?
true
end
def supports_lazy_transactions?
true
end
def get_advisory_lock(lock_id) # :nodoc:
unless lock_id.is_a?(Integer) && lock_id.bit_length <= 63
raise(ArgumentError, "PostgreSQL requires advisory lock ids to be a signed 64 bit integer")
end
query_value("SELECT pg_try_advisory_lock(#{lock_id})")
end
def release_advisory_lock(lock_id) # :nodoc:
unless lock_id.is_a?(Integer) && lock_id.bit_length <= 63
raise(ArgumentError, "PostgreSQL requires advisory lock ids to be a signed 64 bit integer")
end
query_value("SELECT pg_advisory_unlock(#{lock_id})")
end
def enable_extension(name, **)
schema, name = name.to_s.split(".").values_at(-2, -1)
sql = +"CREATE EXTENSION IF NOT EXISTS \"#{name}\""
sql << " SCHEMA #{schema}" if schema
internal_exec_query(sql).tap { reload_type_map }
end
# Removes an extension from the database.
#
# [<tt>:force</tt>]
# Set to +:cascade+ to drop dependent objects as well.
# Defaults to false.
def disable_extension(name, force: false)
internal_exec_query("DROP EXTENSION IF EXISTS \"#{name}\"#{' CASCADE' if force == :cascade}").tap {
reload_type_map
}
end
def extension_available?(name)
query_value("SELECT true FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end
def extension_enabled?(name)
query_value("SELECT installed_version IS NOT NULL FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end
def extensions
internal_exec_query("SELECT extname FROM pg_extension", "SCHEMA", allow_retry: true, materialize_transactions: false).cast_values
end
# Returns a list of defined enum types, and their values.
def enum_types
query = <<~SQL
SELECT
type.typname AS name,
string_agg(enum.enumlabel, ',' ORDER BY enum.enumsortorder) AS value
FROM pg_enum AS enum
JOIN pg_type AS type
ON (type.oid = enum.enumtypid)
GROUP BY type.typname;
SQL
exec_query(query, "SCHEMA").cast_values
end
# Given a name and an array of values, creates an enum type.
def create_enum(name, values)
sql_values = values.map { |s| "'#{s}'" }.join(", ")
query = <<~SQL
DO $$
BEGIN
IF NOT EXISTS (
SELECT 1 FROM pg_type t
WHERE t.typname = '#{name}'
) THEN
CREATE TYPE \"#{name}\" AS ENUM (#{sql_values});
END IF;
END
$$;
SQL
exec_query(query)
end
# Returns the configured supported identifier length supported by PostgreSQL
def max_identifier_length
@max_identifier_length ||= query_value("SHOW max_identifier_length", "SCHEMA").to_i
end
# Set the authorized user for this session
def session_auth=(user)
clear_cache!
execute("SET SESSION AUTHORIZATION #{user}")
end
def use_insert_returning?
@use_insert_returning
end
def get_database_version # :nodoc:
begin
version = valid_raw_connection.database_product
if match = version.match(/([\d\.]*\d).*?/)
version = match[1].split('.').map(&:to_i)
# PostgreSQL version representation does not have more than 4 digits
# From version 10 onwards, PG has changed its versioning policy to
# limit it to only 2 digits. i.e. in 10.x, 10 being the major
# version and x representing the patch release
# Refer to:
# https://www.postgresql.org/support/versioning/
# https://www.postgresql.org/docs/10/static/libpq-status.html -> PQserverVersion()
# for more info
if version.size >= 3
(version[0] * 100 + version[1]) * 100 + version[2]
elsif version.size == 2
if version[0] >= 10
version[0] * 100 * 100 + version[1]
else
(version[0] * 100 + version[1]) * 100
end
elsif version.size == 1
version[0] * 100 * 100
else
0
end
else
0
end
end
end
def default_index_type?(index) # :nodoc:
index.using == :btree || super
end
def build_insert_sql(insert) # :nodoc:
sql = +"INSERT #{insert.into} #{insert.values_list}"
if insert.skip_duplicates?
sql << " ON CONFLICT #{insert.conflict_target} DO NOTHING"
elsif insert.update_duplicates?
sql << " ON CONFLICT #{insert.conflict_target} DO UPDATE SET "
sql << insert.touch_model_timestamps_unless { |column| "#{insert.model.quoted_table_name}.#{column} IS NOT DISTINCT FROM excluded.#{column}" }
sql << insert.updatable_columns.map { |column| "#{column}=excluded.#{column}" }.join(",")
end
sql << " RETURNING #{insert.returning}" if insert.returning
sql
end
def check_version # :nodoc:
if database_version < 90300
raise "Your version of PostgreSQL (#{database_version}) is too old. Active Record supports PostgreSQL >= 9.3."
end
end
def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil, returning: nil) # :nodoc:
val = super
if !use_insert_returning? && pk
unless sequence_name
table_ref = extract_table_ref_from_insert_sql(sql)
sequence_name = default_sequence_name(table_ref, pk)
return val unless sequence_name
end
last_insert_id_result(sequence_name)
else
val
end
end
def execute_batch(statements, name = nil)
execute(combine_multi_statements(statements), name)
end
def explain(arel, binds = [])
sql, binds = to_sql_and_binds(arel, binds)
ActiveRecord::ConnectionAdapters::PostgreSQL::ExplainPrettyPrinter.new.pp(exec_query("EXPLAIN #{sql}", 'EXPLAIN', binds))
end
# from ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements
READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(
:close, :declare, :fetch, :move, :set, :show
) # :nodoc:
private_constant :READ_QUERY
def write_query?(sql) # :nodoc:
!READ_QUERY.match?(sql)
end
# We need to make sure to deallocate all the prepared statements
# since apparently calling close on the statement object
# doesn't always free the server resources and calling
# 'DISCARD ALL' fails if we are inside a transaction
# def clear_cache!
# super
# # Make sure all query plans are *really* gone
# @connection.execute 'DEALLOCATE ALL' if active?
# end
def reset!
@lock.synchronize do
return connect! unless @raw_connection
# Have to deal with rollbacks differently than the AR adapter
@raw_connection.rollback
@raw_connection.execute("DISCARD ALL")
super
end
end
def default_sequence_name(table_name, pk = "id") #:nodoc:
serial_sequence(table_name, pk)
rescue ActiveRecord::StatementInvalid
%Q("#{table_name}_#{pk}_seq")
end
def last_insert_id_result(sequence_name)
exec_query("SELECT currval('#{sequence_name}')", 'SQL')
end
def build_truncate_statements(table_names)
["TRUNCATE TABLE #{table_names.map(&method(:quote_table_name)).join(", ")}"]
end
def all_schemas
select('SELECT nspname FROM pg_namespace').map { |row| row["nspname"] }
end
# Returns the current client message level.
def client_min_messages
return nil if redshift? # not supported on Redshift
# Need to use #execute so we don't try to access the type map before it is initialized
execute('SHOW client_min_messages', 'SCHEMA').values.first.first
end
# Set the client message level.
def client_min_messages=(level)
# Not supported on Redshift
redshift? ? nil : super
end
# ORDER BY clause for the passed order option.
#
# PostgreSQL does not allow arbitrary ordering when using DISTINCT ON,
# so we work around this by wrapping the SQL as a sub-select and ordering
# in that query.
def add_order_by_for_association_limiting!(sql, options)
return sql if options[:order].blank?
order = options[:order].split(',').collect { |s| s.strip }.reject(&:blank?)
order.map! { |s| 'DESC' if s =~ /\bdesc$/i }
order = order.zip((0...order.size).to_a).map { |s,i| "id_list.alias_#{i} #{s}" }.join(', ')
sql.replace "SELECT * FROM (#{sql}) AS id_list ORDER BY #{order}"
end
# @note #quote_string implemented as native
def escape_bytea(string)
return unless string
"\\x#{string.unpack("H*")[0]}"
end
# @override
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
# @note #quote_column_name implemented as native
alias_method :quote_schema_name, :quote_column_name
# Need to clear the cache even though the AR adapter doesn't for some reason
def remove_column(table_name, column_name, type = nil, **options)
super
clear_cache!
end
# @private
def column_for(table_name, column_name)
column_name = column_name.to_s
for column in columns(table_name)
return column if column.name == column_name
end
nil
end
# @private
def column_name_for_operation(operation, node)
case operation
when 'maximum' then 'max'
when 'minimum' then 'min'
when 'average' then 'avg'
else operation.downcase
end
end
private
# Returns the list of a table's column names, data types, and default values.
#
# The underlying query is roughly:
# SELECT column.name, column.type, default.value, column.comment
# FROM column LEFT JOIN default
# ON column.table_id = default.table_id
# AND column.num = default.column_num
# WHERE column.table_id = get_table_id('table_name')
# AND column.num > 0
# AND NOT column.is_dropped
# ORDER BY column.num
#
# If the table name is not prefixed with a schema, the database will
# take the first match from the schema search path.
#
# Query implementation notes:
# - format_type includes the column size constraint, e.g. varchar(50)
# - ::regclass is a function that gives the id for a table name
def column_definitions(table_name)
select_rows(<<~SQL, 'SCHEMA')
SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod,
c.collname, col_description(a.attrelid, a.attnum) AS comment
FROM pg_attribute a
LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
LEFT JOIN pg_type t ON a.atttypid = t.oid
LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
WHERE a.attrelid = #{quote(quote_table_name(table_name))}::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
SQL
end
def extract_table_ref_from_insert_sql(sql)
sql[/into\s("[A-Za-z0-9_."\[\]\s]+"|[A-Za-z0-9_."\[\]]+)\s*/im]
$1.strip if $1
end
def arel_visitor
Arel::Visitors::PostgreSQL.new(self)
end
# Pulled from ActiveRecord's Postgres adapter and modified to use execute
def can_perform_case_insensitive_comparison_for?(column)
@case_insensitive_cache ||= {}
@case_insensitive_cache[column.sql_type] ||= begin
sql = <<~SQL
SELECT exists(
SELECT * FROM pg_proc
WHERE proname = 'lower'
AND proargtypes = ARRAY[#{quote column.sql_type}::regtype]::oidvector
) OR exists(
SELECT * FROM pg_proc
INNER JOIN pg_cast
ON ARRAY[casttarget]::oidvector = proargtypes
WHERE proname = 'lower'
AND castsource = #{quote column.sql_type}::regtype
)
SQL
select_value(sql, 'SCHEMA')
end
end
def translate_exception(exception, message:, sql:, binds:)
return super unless exception.is_a?(ActiveRecord::JDBCError)
# TODO: Can we base these on an error code of some kind?
case exception.message
when /duplicate key value violates unique constraint/
::ActiveRecord::RecordNotUnique.new(message, sql: sql, binds: binds)
when /violates not-null constraint/
::ActiveRecord::NotNullViolation.new(message, sql: sql, binds: binds)
when /violates foreign key constraint/
::ActiveRecord::InvalidForeignKey.new(message, sql: sql, binds: binds)
when /value too long/
::ActiveRecord::ValueTooLong.new(message, sql: sql, binds: binds)
when /out of range/
::ActiveRecord::RangeError.new(message, sql: sql, binds: binds)
when /could not serialize/
::ActiveRecord::SerializationFailure.new(message, sql: sql, binds: binds)
when /deadlock detected/
::ActiveRecord::Deadlocked.new(message, sql: sql, binds: binds)
when /lock timeout/
::ActiveRecord::LockWaitTimeout.new(message, sql: sql, binds: binds)
when /canceling statement/ # This needs to come after lock timeout because the lock timeout message also contains "canceling statement"
::ActiveRecord::QueryCanceled.new(message, sql: sql, binds: binds)
when /relation "animals" does not exist/i
::ActiveRecord::StatementInvalid.new(message, sql: sql, binds: binds, connection_pool: @pool)
else
super
end
end
# @private `Utils.extract_schema_and_table` from AR
def extract_schema_and_table(name)
result = name.scan(/[^".\s]+|"[^"]*"/)[0, 2]
result.each { |m| m.gsub!(/(^"|"$)/, '') }
result.unshift(nil) if result.size == 1 # schema == nil
result # [schema, table]
end
def extract_pg_identifier_from_name(name)
match_data = name[0, 1] == '"' ? name.match(/\"([^\"]+)\"/) : name.match(/([^\.]+)/)
if match_data
rest = name[match_data[0].length..-1]
rest = rest[1..-1] if rest[0, 1] == "."
[match_data[1], (rest.length > 0 ? rest : nil)]
end
end
def local_tz
@local_tz ||= execute('SHOW TIME ZONE', 'SCHEMA').first["TimeZone"]
end
def bind_params_length
32767
end
end
end
require 'arjdbc/util/quoted_cache'
module ActiveRecord::ConnectionAdapters
# NOTE: seems needed on 4.x due loading of '.../postgresql/oid' which
# assumes: class PostgreSQLAdapter < AbstractAdapter
remove_const(:PostgreSQLAdapter) if const_defined?(:PostgreSQLAdapter)
class PostgreSQLAdapter < AbstractAdapter
class_attribute :create_unlogged_tables, default: false
##
# :singleton-method:
# PostgreSQL allows the creation of "unlogged" tables, which do not record
# data in the PostgreSQL Write-Ahead Log. This can make the tables faster,
# but significantly increases the risk of data loss if the database
# crashes. As a result, this should not be used in production
# environments. If you would like all created tables to be unlogged in
# the test environment you can add the following line to your test.rb
# file:
#
# ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.create_unlogged_tables = true
class_attribute :create_unlogged_tables, default: false
##
# :singleton-method:
# PostgreSQL supports multiple types for DateTimes. By default, if you use +datetime+
# in migrations, Rails will translate this to a PostgreSQL "timestamp without time zone".
# Change this in an initializer to use another NATIVE_DATABASE_TYPES. For example, to
# store DateTimes as "timestamp with time zone":
#
# ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type = :timestamptz
#
# Or if you are adding a custom type:
#
# ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::NATIVE_DATABASE_TYPES[:my_custom_type] = { name: "my_custom_type_name" }
# ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type = :my_custom_type
#
# If you're using +:ruby+ as your +config.active_record.schema_format+ and you change this
# setting, you should immediately run <tt>bin/rails db:migrate</tt> to update the types in your schema.rb.
class_attribute :datetime_type, default: :timestamp
# Try to use as much of the built in postgres logic as possible
# maybe someday we can extend the actual adapter
include ActiveRecord::ConnectionAdapters::PostgreSQL::ReferentialIntegrity
include ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements
include ActiveRecord::ConnectionAdapters::PostgreSQL::Quoting
# include Jdbc::ConnectionPoolCallbacks
include ArJdbc::Abstract::Core
include ArJdbc::Abstract::ConnectionManagement
include ArJdbc::Abstract::DatabaseStatements
include ArJdbc::Abstract::StatementCache
include ArJdbc::Abstract::TransactionSupport
include ArJdbc::PostgreSQL
require 'arjdbc/postgresql/oid_types'
include ::ArJdbc::PostgreSQL::OIDTypes
include ::ArJdbc::PostgreSQL::SchemaStatements
include ::ArJdbc::PostgreSQL::ColumnHelpers
include ::ArJdbc::Util::QuotedCache
# AR expects OID to be available on the adapter
OID = ActiveRecord::ConnectionAdapters::PostgreSQL::OID
class << self
def jdbc_connection_class
::ActiveRecord::ConnectionAdapters::PostgreSQLJdbcConnection
end
def new_client(conn_params, adapter_instance)
jdbc_connection_class.new(conn_params, adapter_instance)
end
end
def initialize(...)
super
conn_params = @config.compact
@connection_parameters = conn_params
# @local_tz is initialized as nil to avoid warnings when connect tries to use it
@local_tz = nil
@max_identifier_length = nil
@use_insert_returning = @config.key?(:insert_returning) ?
self.class.type_cast_config_to_boolean(@config[:insert_returning]) : true
end
def self.database_exists?(config)
conn = ActiveRecord::Base.postgresql_connection(config)
conn && conn.really_valid?
rescue ActiveRecord::NoDatabaseError
false
ensure
conn.disconnect! if conn
end
require 'active_record/connection_adapters/postgresql/schema_definitions'
ColumnMethods = ActiveRecord::ConnectionAdapters::PostgreSQL::ColumnMethods
TableDefinition = ActiveRecord::ConnectionAdapters::PostgreSQL::TableDefinition
Table = ActiveRecord::ConnectionAdapters::PostgreSQL::Table
public :sql_for_insert
alias :postgresql_version :database_version
private
FEATURE_NOT_SUPPORTED = "0A000" # :nodoc:
def execute_and_clear(sql, name, binds, prepare: false, async: false)
sql = transform_query(sql)
check_if_write_query(sql)
if !prepare || without_prepared_statement?(binds)
result = exec_no_cache(sql, name, binds, async: async)
else
result = exec_cache(sql, name, binds, async: async)
end
begin
ret = yield result
ensure
# Is this really result in AR PG?
# result.clear
end
ret
end
def exec_no_cache(sql, name, binds, async: false)
materialize_transactions
mark_transaction_written_if_write(sql)
# make sure we carry over any changes to ActiveRecord.default_timezone that have been
# made since we established the connection
update_typemap_for_default_timezone
type_casted_binds = type_casted_binds(binds)
log(sql, name, binds, type_casted_binds, async: async) do
with_raw_connection do |conn|
result = conn.exec_params(sql, type_casted_binds)
verified!
result
end
end
end
def exec_cache(sql, name, binds, async: false)
materialize_transactions
mark_transaction_written_if_write(sql)
update_typemap_for_default_timezone
stmt_key = prepare_statement(sql, binds)
type_casted_binds = type_casted_binds(binds)
log(sql, name, binds, type_casted_binds, stmt_key, async: async) do
ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
@connection.exec_prepared(stmt_key, type_casted_binds)
end
end
rescue ActiveRecord::StatementInvalid => e
raise unless is_cached_plan_failure?(e)
# Nothing we can do if we are in a transaction because all commands
# will raise InFailedSQLTransaction
if in_transaction?
raise ActiveRecord::PreparedStatementCacheExpired.new(e.cause.message)
else
@lock.synchronize do
# outside of transactions we can simply flush this query and retry
@statements.delete sql_key(sql)
end
retry
end
end
# Annoyingly, the code for prepared statements whose return value may
# have changed is FEATURE_NOT_SUPPORTED.
#
# This covers various different error types so we need to do additional
# work to classify the exception definitively as a
# ActiveRecord::PreparedStatementCacheExpired
#
# Check here for more details:
# https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/cache/plancache.c#l573
def is_cached_plan_failure?(e)
pgerror = e.cause
pgerror.result.result_error_field(PG::PG_DIAG_SQLSTATE) == FEATURE_NOT_SUPPORTED &&
pgerror.result.result_error_field(PG::PG_DIAG_SOURCE_FUNCTION) == "RevalidateCachedQuery"
rescue
false
end
def in_transaction?
open_transactions > 0
end
# Returns the statement identifier for the client side cache
# of statements
def sql_key(sql)
"#{schema_search_path}-#{sql}"
end
end
end