Class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter < ActiveRecord::ConnectionAdapters::AbstractAdapter

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 99
class_attribute :create_unlogged_tables, default: false

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 266
def self.database_exists?(config)
  !!ActiveRecord::Base.postgresql_connection(config)
rescue ActiveRecord::NoDatabaseError
  false
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 247
def initialize(connection, logger, connection_parameters, config)
  super(connection, logger, config)

  @connection_parameters = connection_parameters

  # @local_tz is initialized as nil to avoid warnings when connect tries to use it
  @local_tz = nil
  @max_identifier_length = nil

  configure_connection
  add_pg_encoders
  add_pg_decoders

  @type_map = Type::HashLookupTypeMap.new
  initialize_type_map
  @local_tz = execute("SHOW TIME ZONE", "SCHEMA").first["TimeZone"]
  @use_insert_returning = @config.key?(:insert_returning) ? self.class.type_cast_config_to_boolean(@config[:insert_returning]) : true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 273
def active?
  @lock.synchronize do
    @connection.query "SELECT 1"
  end
  true
rescue PG::Error
  false
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 396
def disable_extension(name)
  exec_query("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE").tap {
    reload_type_map
  }
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 307
def disconnect!
  @lock.synchronize do
    super
    @connection.close rescue nil
  end
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 390
def enable_extension(name)
  exec_query("CREATE EXTENSION IF NOT EXISTS \"#{name}\"").tap {
    reload_type_map
  }
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 402
def extension_available?(name)
  query_value("SELECT true FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 406
def extension_enabled?(name)
  query_value("SELECT installed_version IS NOT NULL FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 410
def extensions
  exec_query("SELECT extname FROM pg_extension", "SCHEMA").cast_values
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 214
def index_algorithms
  { concurrently: "CONCURRENTLY" }
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 415
def max_identifier_length
  @max_identifier_length ||= query_value("SHOW max_identifier_length", "SCHEMA").to_i
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 283
def reconnect!
  @lock.synchronize do
    super
    @connection.reset
    configure_connection
  rescue PG::ConnectionBad
    connect
  end
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 293
def reset!
  @lock.synchronize do
    clear_cache!
    reset_transaction
    unless @connection.transaction_status == ::PG::PQTRANS_IDLE
      @connection.query "ROLLBACK"
    end
    @connection.query "DISCARD ALL"
    configure_connection
  end
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 420
def session_auth=(user)
  clear_cache!
  execute("SET SESSION AUTHORIZATION #{user}")
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 324
def set_standard_conforming_strings
  execute("SET standard_conforming_strings = on", "SCHEMA")
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 332
def supports_advisory_locks?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 151
def supports_bulk_alter?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 195
def supports_comments?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 368
def supports_common_table_expressions?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 187
def supports_datetime_with_precision?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 328
def supports_ddl_transactions?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 336
def supports_explain?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 167
def supports_expression_index?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 340
def supports_extensions?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 175
def supports_foreign_keys?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 353
def supports_foreign_tables?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 155
def supports_index_sort_order?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 207
def supports_insert_on_conflict?
  database_version >= 90500
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 203
def supports_insert_returning?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 191
def supports_json?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 372
def supports_lazy_transactions?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 349
def supports_materialized_views?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 361
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

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 163
def supports_partial_index?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 159
def supports_partitioned_indexes?
  database_version >= 110_000
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 357
def supports_pgcrypto_uuid?
  database_version >= 90400
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 344
def supports_ranges?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 199
def supports_savepoints?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 171
def supports_transaction_isolation?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 179
def supports_validate_constraints?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 183
def supports_views?
  true
end

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 425
def use_insert_returning?
  @use_insert_returning
end