Module: ArJdbc::PostgreSQL

Included in:
ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
Defined in:
lib/arjdbc/postgresql/adapter.rb,
lib/arjdbc/postgresql/column.rb,
lib/arjdbc/postgresql/oid_types.rb

Overview

Strives to provide Rails built-in PostgreSQL adapter (API) compatibility.

Defined Under Namespace

Classes: ArjdbcTypeMapInitializer

Constant Summary collapse

ADAPTER_NAME = 
'PostgreSQL'
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' },
  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' }
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.jdbc_connection_class ⇒ Object

See Also:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 39

def self.jdbc_connection_class
  ::ActiveRecord::ConnectionAdapters::PostgreSQLJdbcConnection
end

Instance Method Details

#adapter_name ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 48

def adapter_name
  ADAPTER_NAME
end

#add_order_by_for_association_limiting!(sql, options) ⇒ Object

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.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 517

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

#all_schemas ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 495

def all_schemas
  select('SELECT nspname FROM pg_namespace').map { |row| row["nspname"] }
end

#build_insert_sql(insert) ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 408

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

#build_truncate_statements(table_names) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 491

def build_truncate_statements(table_names)
  ["TRUNCATE TABLE #{table_names.map(&method(:quote_table_name)).join(", ")}"]
end

#check_version ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 423

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

#clear_cache! ⇒ Object

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



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# File 'lib/arjdbc/postgresql/adapter.rb', line 467

def clear_cache!
  super
  # Make sure all query plans are *really* gone
  @connection.execute 'DEALLOCATE ALL' if active?
end

#client_min_messages ⇒ Object

Returns the current client message level.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 500

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

#client_min_messages=(level) ⇒ Object

Set the client message level.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 507

def client_min_messages=(level)
  # Not supported on Redshift
  redshift? ? nil : super
end

#configure_connection ⇒ Object

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.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 69

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
end

#create_enum(name, values) ⇒ Object

Given a name and an array of values, creates an enum type.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 339

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

#default_index_type?(index) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 404

def default_index_type?(index) # :nodoc:
  index.using == :btree || super
end

#default_sequence_name(table_name, pk = "id") ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 481

def default_sequence_name(table_name, pk = "id") #:nodoc:
  serial_sequence(table_name, pk)
rescue ActiveRecord::StatementInvalid
  %Q("#{table_name}_#{pk}_seq")
end

#disable_extension(name) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 306

def disable_extension(name)
  exec_query("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE").tap {
    reload_type_map
  }
end

#enable_extension(name) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 300

def enable_extension(name)
  exec_query("CREATE EXTENSION IF NOT EXISTS \"#{name}\"").tap {
    reload_type_map
  }
end

#enum_types ⇒ Object

Returns a list of defined enum types, and their values.



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# File 'lib/arjdbc/postgresql/adapter.rb', line 325

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

#escape_bytea(string) ⇒ Object

Note:

quote_string implemented as native



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# File 'lib/arjdbc/postgresql/adapter.rb', line 529

def escape_bytea(string)
  return unless string
  "\\x#{string.unpack("H*")[0]}"
end

#exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 430

def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil)
  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

#execute_batch(statements, name = nil) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 444

def execute_batch(statements, name = nil)
  execute(combine_multi_statements(statements), name)
end

#explain(arel, binds = []) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 448

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

#extension_available?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 312

def extension_available?(name)
  query_value("SELECT true FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end

#extension_enabled?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 316

def extension_enabled?(name)
  query_value("SELECT installed_version IS NOT NULL FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA")
end

#extensions ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 320

def extensions
  exec_query("SELECT extname FROM pg_extension", "SCHEMA").cast_values
end

#get_advisory_lock(lock_id) ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 286

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

#get_database_version ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 371

def get_database_version # :nodoc:
  begin
    version = @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

#index_algorithms ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 235

def index_algorithms
  { concurrently: 'CONCURRENTLY' }
end

#jdbc_column_class ⇒ Object

See Also:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 44

def jdbc_column_class; ::ActiveRecord::ConnectionAdapters::PostgreSQLColumn end

#last_insert_id_result(sequence_name) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 487

def last_insert_id_result(sequence_name)
  exec_query("SELECT currval('#{sequence_name}')", 'SQL')
end

#max_identifier_length ⇒ Object

Returns the configured supported identifier length supported by PostgreSQL



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# File 'lib/arjdbc/postgresql/adapter.rb', line 357

def max_identifier_length
  @max_identifier_length ||= query_value("SHOW max_identifier_length", "SCHEMA").to_i
end

#native_database_types ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 156

def native_database_types
  NATIVE_DATABASE_TYPES
end

#quote_table_name(name) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 535

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

#release_advisory_lock(lock_id) ⇒ Object

:nodoc:



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# File 'lib/arjdbc/postgresql/adapter.rb', line 293

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

#remove_column(table_name, column_name, type = nil, **options) ⇒ Object

Need to clear the cache even though the AR adapter doesn't for some reason



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# File 'lib/arjdbc/postgresql/adapter.rb', line 550

def remove_column(table_name, column_name, type = nil, **options)
  super
  clear_cache!
end

#reset! ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 473

def reset!
  clear_cache!
  reset_transaction
  @connection.rollback # Have to deal with rollbacks differently than the AR adapter
  @connection.execute 'DISCARD ALL'
  @connection.configure_connection
end

#session_auth=(user) ⇒ Object

Set the authorized user for this session



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# File 'lib/arjdbc/postgresql/adapter.rb', line 362

def session_auth=(user)
  clear_cache!
  execute("SET SESSION AUTHORIZATION #{user}")
end

#set_client_encoding(encoding) ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 62

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

#set_standard_conforming_strings ⇒ Object 



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# File 'lib/arjdbc/postgresql/adapter.rb', line 164

def set_standard_conforming_strings
  execute("SET standard_conforming_strings = on", "SCHEMA")
end

#supports_advisory_locks? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 243

def supports_advisory_locks?
  true
end

#supports_bulk_alter? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 168

def supports_bulk_alter?
  true
end

#supports_check_constraints? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 196

def supports_check_constraints?
  true
end

#supports_comments? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 216

def supports_comments?
  true
end

#supports_common_table_expressions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 278

def supports_common_table_expressions?
  true
end

#supports_datetime_with_precision? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 208

def supports_datetime_with_precision?
  true
end

#supports_ddl_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 239

def supports_ddl_transactions?
  true
end

#supports_explain? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 247

def supports_explain?
  true
end

#supports_expression_index? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 184

def supports_expression_index?
  true
end

#supports_extensions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 251

def supports_extensions?
  database_version >= 90200
end

#supports_foreign_keys? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 192

def supports_foreign_keys?
  true
end

#supports_foreign_tables? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 263

def supports_foreign_tables?
  database_version >= 90300
end

#supports_index_sort_order? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 172

def supports_index_sort_order?
  true
end

#supports_insert_on_conflict? ⇒ Boolean Also known as: supports_insert_on_duplicate_skip?, supports_insert_on_duplicate_update?, supports_insert_conflict_target?

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 228

def supports_insert_on_conflict?
  database_version >= 90500
end

#supports_insert_returning? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 224

def supports_insert_returning?
  true
end

#supports_json? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 212

def supports_json?
  database_version >= 90200
end

#supports_lazy_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 282

def supports_lazy_transactions?
  true
end

#supports_materialized_views? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 259

def supports_materialized_views?
  database_version >= 90300
end

#supports_optimizer_hints? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 271

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

#supports_partial_index? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 180

def supports_partial_index?
  true
end

#supports_partitioned_indexes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 176

def supports_partitioned_indexes?
  database_version >= 110_000
end

#supports_pgcrypto_uuid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 267

def supports_pgcrypto_uuid?
  database_version >= 90400
end

#supports_ranges? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 255

def supports_ranges?
  database_version >= 90200
end

#supports_savepoints? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 220

def supports_savepoints?
  true
end

#supports_transaction_isolation? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 188

def supports_transaction_isolation?
  true
end

#supports_validate_constraints? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 200

def supports_validate_constraints?
  true
end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 204

def supports_views?
  true
end

#use_insert_returning? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 367

def use_insert_returning?
  @use_insert_returning
end

#valid_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 160

def valid_type?(type)
  !native_database_types[type].nil?
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/postgresql/adapter.rb', line 459

def write_query?(sql) # :nodoc:
  !READ_QUERY.match?(sql)
end