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,
lib/arjdbc/postgresql/explain_support.rb,
lib/arjdbc/postgresql/schema_creation.rb

Overview

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

Defined Under Namespace

Classes: SchemaCreation

Constant Summary collapse

ADAPTER_NAME = 
'PostgreSQL'.freeze
NATIVE_DATABASE_TYPES = 
{
  :primary_key => "serial primary key",
  :string => { :name => "character varying", :limit => 255 },
  :text => { :name => "text" },
  :integer => { :name => "integer" },
  :float => { :name => "float" },
  :numeric => { :name => "numeric" },
  :decimal => { :name => "decimal" }, # :limit => 1000
  :datetime => { :name => "timestamp" },
  :timestamp => { :name => "timestamp" },
  :time => { :name => "time" },
  :date => { :name => "date" },
  :binary => { :name => "bytea" },
  :boolean => { :name => "boolean" },
  :xml => { :name => "xml" },
  # AR-JDBC added :
  #:timestamptz => { :name => "timestamptz" },
  #:timetz => { :name => "timetz" },
  :money => { :name=>"money" },
  :char => { :name => "char" },
  :serial => { :name => "serial" }, # auto-inc integer, bigserial, smallserial
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.arel_visitor_type(config = nil) ⇒ Object 



47
48
49
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 47

def self.arel_visitor_type(config = nil)
  ::Arel::Visitors::PostgreSQL
end

.column_selector ⇒ Object

See Also:

  • ActiveRecord::ConnectionAdapters::JdbcColumn#column_types


5
6
7
 
# File 'lib/arjdbc/postgresql/column.rb', line 5

def self.column_selector
  [ /postgre/i, lambda { |cfg, column| column.extend(Column) } ]
end

.jdbc_connection_class ⇒ Object

See Also:



29
30
31
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 29

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

.unescape_bytea(escaped) ⇒ Object 



14
15
16
 
# File 'lib/arjdbc/postgresql/oid_types.rb', line 14

def self.unescape_bytea(escaped)
  String.from_java_bytes Java::OrgPostgresqlUtil::PGbytea.toBytes escaped.to_java_bytes
end

Instance Method Details

#adapter_name ⇒ Object 



59
60
61
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 59

def adapter_name
  ADAPTER_NAME
end

#add_index(table_name, column_name, options = {}) ⇒ Object

unless const_defined? :SchemaCreation



1170
1171
1172
1173
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1170

def add_index(table_name, column_name, options = {})
  index_name, index_type, index_columns, index_options, index_algorithm, index_using = add_index_options(table_name, column_name, options)
  execute "CREATE #{index_type} INDEX #{index_algorithm} #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} #{index_using} (#{index_columns})#{index_options}"
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.



842
843
844
845
846
847
848
849
850
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 842

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 



755
756
757
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 755

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

#change_column(table_name, column_name, type, options = {}) ⇒ Object

Changes the column of a table.



1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1081

def change_column(table_name, column_name, type, options = {})
  quoted_table_name = quote_table_name(table_name)
  quoted_column_name = quote_table_name(column_name)

  sql_type = type_to_sql(type, options[:limit], options[:precision], options[:scale])
  sql_type << "[]" if options[:array]

  sql = "ALTER TABLE #{quoted_table_name} ALTER COLUMN #{quoted_column_name} TYPE #{sql_type}"
  sql << " USING #{options[:using]}" if options[:using]
  if options[:cast_as]
    sql << " USING CAST(#{quoted_column_name} AS #{type_to_sql(options[:cast_as], options[:limit], options[:precision], options[:scale])})"
  end
  begin
    execute sql
  rescue ActiveRecord::StatementInvalid => e
    raise e if postgresql_version > 80000
    change_column_pg7(table_name, column_name, type, options)
  end

  change_column_default(table_name, column_name, options[:default]) if options_include_default?(options)
  change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null)
end

#change_column_default(table_name, column_name, default) ⇒ Object

Changes the default value of a table column.



1122
1123
1124
1125
1126
1127
1128
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1122

def change_column_default(table_name, column_name, default)
  if column = column_for(table_name, column_name) # (backwards) compatible with AR 3.x - 4.x
    execute "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT #{quote_default_value(default, column)}"
  else
    execute "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT #{quote(default)}"
  end
end

#client_min_messages ⇒ Object

Returns the current client message level.



788
789
790
791
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 788

def client_min_messages
  return nil if redshift? # not supported on Redshift
  select_value('SHOW client_min_messages', 'SCHEMA')
end

#client_min_messages=(level) ⇒ Object

Set the client message level.



794
795
796
797
798
799
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 794

def client_min_messages=(level)
  # NOTE: for now simply ignore the writer (no warn on Redshift) so that
  # the AR copy-pasted PpstgreSQL parts stay the same as much as possible
  return nil if redshift? # not supported on Redshift
  execute("SET client_min_messages TO '#{level}'", 'SCHEMA')
end

#collation ⇒ Object

Returns the current database collation.



646
647
648
649
650
651
652
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 646

def collation
  select_value(
    "SELECT pg_database.datcollate" <<
    " FROM pg_database" <<
    " WHERE pg_database.datname LIKE '#{current_database}'",
  'SCHEMA')
end

#columns_for_distinct(columns, orders) ⇒ Object

PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.



819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 819

def columns_for_distinct(columns, orders)
  if orders.is_a?(String)
    orders = orders.split(','); orders.each(&:strip!)
  end

  order_columns = orders.reject(&:blank?).map! do |column|
    column = column.is_a?(String) ? column.dup : column.to_sql # AREL node
    column.gsub!(/\s+(?:ASC|DESC)\s*/i, '') # remove any ASC/DESC modifiers
    column.gsub!(/\s*NULLS\s+(?:FIRST|LAST)?\s*/i, '')
    column
  end
  order_columns.reject!(&:empty?)
  i = -1; order_columns.map! { |column| "#{column} AS alias_#{i += 1}" }

  columns = [ columns ]; columns.flatten!
  columns.push( *order_columns ).join(', ')
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.



104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 104

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::Base.default_timezone == :utc
    execute("SET time zone 'UTC'", 'SCHEMA')
  elsif tz = local_tz
    execute("SET time zone '#{tz}'", 'SCHEMA')
  end unless redshift?

  # 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_database(name, options = {}) ⇒ Object

Create a new PostgreSQL database. Options include :owner, :template, :encoding, :collation, :ctype, :tablespace, and :connection_limit (note that MySQL uses :charset while PostgreSQL uses :encoding).

Example: create_database config[:database], config create_database 'foo_development', encoding: 'unicode'



710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 710

def create_database(name, options = {})
  options = { :encoding => 'utf8' }.merge!(options.symbolize_keys)

  option_string = options.sum do |key, value|
    case key
    when :owner
      " OWNER = \"#{value}\""
    when :template
      " TEMPLATE = \"#{value}\""
    when :encoding
      " ENCODING = '#{value}'"
    when :collation
      " LC_COLLATE = '#{value}'"
    when :ctype
      " LC_CTYPE = '#{value}'"
    when :tablespace
      " TABLESPACE = \"#{value}\""
    when :connection_limit
      " CONNECTION LIMIT = #{value}"
    else
      ""
    end
  end

  execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}"
end

#create_savepoint(name = current_savepoint_name(true)) ⇒ Object 



393
394
395
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 393

def create_savepoint(name = current_savepoint_name(true))
  log("SAVEPOINT #{name}", 'Savepoint') { super }
end

#create_schema(schema_name, pg_username = nil) ⇒ Object

Creates a schema for the given schema name.



742
743
744
745
746
747
748
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 742

def create_schema(schema_name, pg_username = nil)
  if pg_username.nil? # AR 4.0 compatibility - accepts only single argument
    execute "CREATE SCHEMA #{schema_name}"
  else
    execute("CREATE SCHEMA \"#{schema_name}\" AUTHORIZATION \"#{pg_username}\"")
  end
end

#ctype ⇒ Object

Returns the current database ctype.



655
656
657
658
659
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 655

def ctype
  select_value(
    "SELECT pg_database.datctype FROM pg_database WHERE pg_database.datname LIKE '#{current_database}'",
  'SCHEMA')
end

#current_database ⇒ Object

current database name



632
633
634
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 632

def current_database
  select_value('SELECT current_database()', 'SCHEMA')
end

#current_schema ⇒ Object

Returns the current schema name.



627
628
629
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 627

def current_schema
  select_value('SELECT current_schema', 'SCHEMA')
end

#default_sequence_name(table_name, pk = nil) ⇒ Object 



455
456
457
458
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 455

def default_sequence_name(table_name, pk = nil)
  default_pk, default_seq = pk_and_sequence_for(table_name)
  default_seq || "#{table_name}_#{pk || default_pk || 'id'}_seq"
end

#disable_extension(name) ⇒ Object 



415
416
417
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 415

def disable_extension(name)
  execute("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE")
end

#disable_referential_integrity ⇒ Object 



1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1029

def disable_referential_integrity
  if supports_disable_referential_integrity?
    begin
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER ALL" }.join(";"))
    rescue
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER USER" }.join(";"))
    end
  end
  yield
ensure
  if supports_disable_referential_integrity?
    begin
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER ALL" }.join(";"))
    rescue
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER USER" }.join(";"))
    end
  end
end

#distinct(columns, orders) ⇒ Object 



812
813
814
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 812

def distinct(columns, orders)
  "DISTINCT #{columns_for_distinct(columns, orders)}"
end

#drop_database(name) ⇒ Object 



737
738
739
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 737

def drop_database(name)
  execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}"
end

#drop_schema(schema_name) ⇒ Object

Drops the schema for the given schema name.



751
752
753
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 751

def drop_schema schema_name
  execute "DROP SCHEMA #{schema_name} CASCADE"
end

#drop_table(table_name, options = {}) ⇒ Object 



1334
1335
1336
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1334

def drop_table(table_name, options = {})
  execute "DROP TABLE #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
end

#enable_extension(name) ⇒ Object

NOTE: only since AR-4.0 but should not hurt on other versions



411
412
413
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 411

def enable_extension(name)
  execute("CREATE EXTENSION IF NOT EXISTS \"#{name}\"")
end

#encoding ⇒ Object

Returns the current database encoding format.



637
638
639
640
641
642
643
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 637

def encoding
  select_value(
    "SELECT pg_encoding_to_char(pg_database.encoding)" <<
    " FROM pg_database" <<
    " WHERE pg_database.datname LIKE '#{current_database}'",
  'SCHEMA')
end

#escape_bytea(string) ⇒ Object 



969
970
971
972
973
974
975
976
977
978
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 969

def escape_bytea(string)
  return unless string
  if supports_hex_escaped_bytea?
    "\\\\x#{string.unpack("H*")[0]}"
  else
    result = ''
    string.each_byte { |c| result << sprintf('\\\\%03o', c) }
    result
  end
end

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



576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 576

def exec_insert(sql, name, binds, pk = nil, sequence_name = nil)
  # NOTE: 3.2 does not pass the PK on #insert (passed only into #sql_for_insert) :
  #   sql, binds = sql_for_insert(to_sql(arel, binds), pk, id_value, sequence_name, binds)
  # 3.2 :
  #  value = exec_insert(sql, name, binds)
  # 4.x :
  #  value = exec_insert(sql, name, binds, pk, sequence_name)
  if use_insert_returning? && ( pk || (sql.is_a?(String) && sql =~ /RETURNING "?\S+"?$/) )
    exec_query(sql, name, binds) # due RETURNING clause returns a result set
  else
    result = super
    if pk
      unless sequence_name
        table_ref = extract_table_ref_from_insert_sql(sql)
        sequence_name = default_sequence_name(table_ref, pk)
        return result unless sequence_name
      end
      last_insert_id_result(sequence_name)
    else
      result
    end
  end
end

#extension_enabled?(name) ⇒ Boolean

Returns:

  • (Boolean) 


419
420
421
422
423
424
425
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 419

def extension_enabled?(name)
  if supports_extensions?
    rows = select_rows("SELECT EXISTS(SELECT * FROM pg_available_extensions WHERE name = '#{name}' AND installed_version IS NOT NULL)", 'SCHEMA')
    available = rows.first.first # true/false or 't'/'f'
    available == true || available == 't'
  end
end

#extensions ⇒ Object 



427
428
429
430
431
432
433
434
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 427

def extensions
  if supports_extensions?
    rows = select_rows "SELECT extname from pg_extension", "SCHEMA"
    rows.map { |row| row.first }
  else
    []
  end
end

#foreign_keys(table_name) ⇒ Object 



1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1187

def foreign_keys(table_name)
  fk_info = select_all "" <<
    "SELECT t2.oid::regclass::text AS to_table, a1.attname AS column, a2.attname AS primary_key, c.conname AS name, c.confupdtype AS on_update, c.confdeltype AS on_delete " <<
    "FROM pg_constraint c " <<
    "JOIN pg_class t1 ON c.conrelid = t1.oid " <<
    "JOIN pg_class t2 ON c.confrelid = t2.oid " <<
    "JOIN pg_attribute a1 ON a1.attnum = c.conkey[1] AND a1.attrelid = t1.oid " <<
    "JOIN pg_attribute a2 ON a2.attnum = c.confkey[1] AND a2.attrelid = t2.oid " <<
    "JOIN pg_namespace t3 ON c.connamespace = t3.oid " <<
    "WHERE c.contype = 'f' " <<
    "  AND t1.relname = #{quote(table_name)} " <<
    "  AND t3.nspname = ANY (current_schemas(false)) " <<
    "ORDER BY c.conname "

  fk_info.map! do |row|
    options = {
      :column => row['column'], :name => row['name'], :primary_key => row['primary_key']
    }
    options[:on_delete] = extract_foreign_key_action(row['on_delete'])
    options[:on_update] = extract_foreign_key_action(row['on_update'])

    ForeignKeyDefinition.new(table_name, row['to_table'], options)
  end
end

#index_algorithms ⇒ Object 



436
437
438
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 436

def index_algorithms
  { :concurrently => 'CONCURRENTLY' }
end

#index_name_exists?(table_name, index_name, default) ⇒ Boolean

Returns:

  • (Boolean) 


1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1342

def index_name_exists?(table_name, index_name, default)
  exec_query(<<-SQL, 'SCHEMA').rows.first[0].to_i > 0
    SELECT COUNT(*)
    FROM pg_class t
    INNER JOIN pg_index d ON t.oid = d.indrelid
    INNER JOIN pg_class i ON d.indexrelid = i.oid
    WHERE i.relkind = 'i'
      AND i.relname = '#{index_name}'
      AND t.relname = '#{table_name}'
      AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY (current_schemas(false)) )
  SQL
end

#index_name_length ⇒ Object 



1222
1223
1224
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1222

def index_name_length
  63
end

#indexes(table_name, name = nil) ⇒ Object

Returns an array of indexes for the given table.



1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1356

def indexes(table_name, name = nil)
  # NOTE: maybe it's better to leave things of to the JDBC API ?!
  result = select_rows(<<-SQL, 'SCHEMA')
    SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid), t.oid
    FROM pg_class t
    INNER JOIN pg_index d ON t.oid = d.indrelid
    INNER JOIN pg_class i ON d.indexrelid = i.oid
    WHERE i.relkind = 'i'
      AND d.indisprimary = 'f'
      AND t.relname = '#{table_name}'
      AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY (current_schemas(false)) )
    ORDER BY i.relname
  SQL

  result.map! do |row|
    index_name = row[0]
    unique = row[1].is_a?(String) ? row[1] == 't' : row[1] # JDBC gets us a boolean
    indkey = row[2].is_a?(Java::OrgPostgresqlUtil::PGobject) ? row[2].value : row[2]
    indkey = indkey.split(" ")
    inddef = row[3]
    oid = row[4]

    columns = select_rows(<<-SQL, "SCHEMA")
      SELECT a.attnum, a.attname
      FROM pg_attribute a
      WHERE a.attrelid = #{oid}
      AND a.attnum IN (#{indkey.join(",")})
    SQL

    columns = Hash[ columns.each { |column| column[0] = column[0].to_s } ]
    column_names = columns.values_at(*indkey).compact

    unless column_names.empty?
      # add info on sort order for columns (only desc order is explicitly specified, asc is the default)
      desc_order_columns = inddef.scan(/(\w+) DESC/).flatten
      orders = desc_order_columns.any? ? Hash[ desc_order_columns.map { |column| [column, :desc] } ] : {}

      if ::ActiveRecord::VERSION::MAJOR > 3 # AR4 supports `where` and `using` index options
        where = inddef.scan(/WHERE (.+)$/).flatten[0]
        using = inddef.scan(/USING (.+?) /).flatten[0].to_sym

        IndexDefinition.new(table_name, index_name, unique, column_names, [], orders, where, nil, using)
      else
        new_index_definition(table_name, index_name, unique, column_names, [], orders)
      end
    end
  end
  result.compact!
  result
end

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



533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 533

def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = [])
  unless pk
    # Extract the table from the insert sql. Yuck.
    table_ref = extract_table_ref_from_insert_sql(sql)
    pk = primary_key(table_ref) if table_ref
  end

  if pk && use_insert_returning? # && id_value.nil?
    select_value("#{to_sql(sql, binds)} RETURNING #{quote_column_name(pk)}")
  else
    execute(sql, name, binds) # super
    unless id_value
      table_ref ||= extract_table_ref_from_insert_sql(sql)
      # If neither PK nor sequence name is given, look them up.
      if table_ref && ! ( pk ||= primary_key(table_ref) ) && ! sequence_name
        pk, sequence_name = pk_and_sequence_for(table_ref)
      end
      # If a PK is given, fallback to default sequence name.
      # Don't fetch last insert id for a table without a PK.
      if pk && sequence_name ||= default_sequence_name(table_ref, pk)
        id_value = last_insert_id(table_ref, sequence_name)
      end
    end
    id_value
  end
end

#jdbc_column_class ⇒ Object

See Also:



34
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 34

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

#last_insert_id(table, sequence_name = nil) ⇒ Object 



688
689
690
691
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 688

def last_insert_id(table, sequence_name = nil)
  sequence_name = table if sequence_name.nil? # AR-4.0 1 argument
  last_insert_id_result(sequence_name)
end

#last_insert_id_result(sequence_name) ⇒ Object 



693
694
695
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 693

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

#last_inserted_id(result) ⇒ Integer, NilClass

Take an id from the result of an INSERT query.

Returns:

  • (Integer, NilClass) 


680
681
682
683
684
685
686
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 680

def last_inserted_id(result)
  return nil if result.nil?
  return result if result.is_a? Integer
  # <ActiveRecord::Result @hash_rows=nil, @columns=["id"], @rows=[[3]]>
  # but it will work with [{ 'id' => 1 }] Hash wrapped results as well
  result.first.first[1] # .first = { "id"=>1 } .first = [ "id", 1 ]
end

#migration_keys ⇒ Object

Adds :array as a valid migration key.



303
304
305
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 303

def migration_keys
  super + [:array]
end

#multi_column_index_limit ⇒ Object

Gets the maximum number columns postgres has, default 32



802
803
804
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 802

def multi_column_index_limit
  defined?(@multi_column_index_limit) && @multi_column_index_limit || 32
end

#multi_column_index_limit=(limit) ⇒ Object

Sets the maximum number columns postgres has, default 32



807
808
809
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 807

def multi_column_index_limit=(limit)
  @multi_column_index_limit = limit
end

#native_database_types ⇒ Object 



288
289
290
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 288

def native_database_types
  NATIVE_DATABASE_TYPES
end

#pk_and_sequence_for(table) ⇒ Object

Find a table's primary key and sequence.



476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 476

def pk_and_sequence_for(table)
  # try looking for a seq with a dependency on the table's primary key :
  result = select(<<-end_sql, 'PK and Serial Sequence')[0]
      SELECT attr.attname, seq.relname
      FROM pg_class      seq,
           pg_attribute  attr,
           pg_depend     dep,
           pg_constraint cons
      WHERE seq.oid           = dep.objid
        AND seq.relkind       = 'S'
        AND attr.attrelid     = dep.refobjid
        AND attr.attnum       = dep.refobjsubid
        AND attr.attrelid     = cons.conrelid
        AND attr.attnum       = cons.conkey[1]
        AND cons.contype      = 'p'
        AND dep.refobjid      = '#{quote_table_name(table)}'::regclass
    end_sql

  if result.nil? || result.empty?
    # if that fails, try parsing the primary key's default value :
    result = select(<<-end_sql, 'PK and Custom Sequence')[0]
        SELECT attr.attname,
          CASE
            WHEN pg_get_expr(def.adbin, def.adrelid) !~* 'nextval' THEN NULL
            WHEN split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2) ~ '.' THEN
              substr(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2),
                strpos(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2), '.')+1)
            ELSE split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2)
          END as relname
        FROM pg_class       t
        JOIN pg_attribute   attr ON (t.oid = attrelid)
        JOIN pg_attrdef     def  ON (adrelid = attrelid AND adnum = attnum)
        JOIN pg_constraint  cons ON (conrelid = adrelid AND adnum = conkey[1])
        WHERE t.oid = '#{quote_table_name(table)}'::regclass
          AND cons.contype = 'p'
          AND pg_get_expr(def.adbin, def.adrelid) ~* 'nextval|uuid_generate'
      end_sql
  end

  [ result['attname'], result['relname'] ]
rescue
  nil
end

#postgresql_version ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 63

def postgresql_version
  @postgresql_version ||=
    begin
      version = select_version
      if version =~ /PostgreSQL (\d+)\.(\d+)\.(\d+)/
        ($1.to_i * 10000) + ($2.to_i * 100) + $3.to_i
      else
        0
      end
    end
end

#prepare_column_options(column, types) ⇒ Object

Adds :array option to the default set provided by the AbstractAdapter.



294
295
296
297
298
299
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 294

def prepare_column_options(column, types)
  spec = super
  spec[:array] = 'true' if column.respond_to?(:array) && column.array
  spec[:default] = "\"#{column.default_function}\"" if column.default_function
  spec
end

#primary_key(table) ⇒ Object 



520
521
522
523
524
525
526
527
528
529
530
531
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 520

def primary_key(table)
  result = select(<<-end_sql, 'SCHEMA').first
    SELECT attr.attname
    FROM pg_attribute attr
    INNER JOIN pg_constraint cons ON attr.attrelid = cons.conrelid AND attr.attnum = any(cons.conkey)
    WHERE cons.contype = 'p' AND cons.conrelid = '#{quote_table_name(table)}'::regclass
  end_sql

  result && result['attname']
  # pk_and_sequence = pk_and_sequence_for(table)
  # pk_and_sequence && pk_and_sequence.first
end

#quote(value, column = nil) ⇒ String

Returns:

  • (String) 


854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 854

def quote(value, column = nil)
  return super unless column && column.type
  return value if sql_literal?(value)

  case value
  when Float
    if value.infinite? && ( column.type == :datetime || column.type == :timestamp )
      "'#{value.to_s.downcase}'"
    elsif value.infinite? || value.nan?
      "'#{value.to_s}'"
    else super
    end
  when Numeric
    if column.respond_to?(:sql_type) && column.sql_type == 'money'
      "'#{value}'"
    elsif column.type == :string || column.type == :text
      "'#{value}'"
    else super
    end
  when String
    return "E'#{escape_bytea(value)}'::bytea" if column.type == :binary
    return "xml '#{quote_string(value)}'" if column.type == :xml
    sql_type = column.respond_to?(:sql_type) && column.sql_type
    sql_type && sql_type[0, 3] == 'bit' ? quote_bit(value) : super
  when Array
    if AR40 && column.array? # will be always falsy in AR < 4.0
      "'#{jdbc_column_class.array_to_string(value, column, self).gsub(/'/, "''")}'"
    elsif column.type == :json # only in AR-4.0
      super(jdbc_column_class.json_to_string(value), column)
    elsif column.type == :jsonb # only in AR-4.0
      super(jdbc_column_class.json_to_string(value), column)
    elsif column.type == :point # only in AR-4.0
      super(jdbc_column_class.point_to_string(value), column)
    else super
    end
  when Hash
    if column.type == :hstore # only in AR-4.0
      super(jdbc_column_class.hstore_to_string(value), column)
    elsif column.type == :json # only in AR-4.0
      super(jdbc_column_class.json_to_string(value), column)
    elsif column.type == :jsonb # only in AR-4.0
      super(jdbc_column_class.json_to_string(value), column)
    else super
    end
  when Range
    sql_type = column.respond_to?(:sql_type) && column.sql_type
    if sql_type && sql_type[-5, 5] == 'range' && AR40
      escaped = quote_string(jdbc_column_class.range_to_string(value))
      "'#{escaped}'::#{sql_type}"
    else super
    end
  when IPAddr
    if column.type == :inet || column.type == :cidr # only in AR-4.0
      super(jdbc_column_class.cidr_to_string(value), column)
    else super
    end
  else
    super
  end
end

#quote_bit(value) ⇒ String

Returns:

  • (String) 


952
953
954
955
956
957
958
959
960
961
962
963
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 952

def quote_bit(value)
  case value
  # NOTE: as reported with #60 this is not quite "right" :
  #  "0103" will be treated as hexadecimal string
  #  "0102" will be treated as hexadecimal string
  #  "0101" will be treated as binary string
  #  "0100" will be treated as binary string
  # ... but is kept due Rails compatibility
  when /\A[01]*\Z/ then "B'#{value}'" # Bit-string notation
  when /\A[0-9A-F]*\Z/i then "X'#{value}'" # Hexadecimal notation
  end
end

#quote_column_name(name) ⇒ Object 



998
999
1000
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 998

def quote_column_name(name)
  %("#{name.to_s.gsub("\"", "\"\"")}")
end

#quote_string(string) ⇒ String

Quotes a string, escaping any ' (single quote) and \ (backslash) chars.

Returns:

  • (String) 


943
944
945
946
947
948
949
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 943

def quote_string(string)
  quoted = string.gsub("'", "''")
  unless standard_conforming_strings?
    quoted.gsub!(/\\/, '\&\&')
  end
  quoted
end

#quote_table_name(name) ⇒ Object 



981
982
983
984
985
986
987
988
989
990
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 981

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

#quote_table_name_for_assignment(table, attr) ⇒ Object 



993
994
995
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 993

def quote_table_name_for_assignment(table, attr)
  quote_column_name(attr)
end

#quoted_date(value) ⇒ Object

Quote date/time values for use in SQL input. Includes microseconds if the value is a Time responding to usec.



1015
1016
1017
1018
1019
1020
1021
1022
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1015

def quoted_date(value)
  result = super
  if value.acts_like?(:time) && value.respond_to?(:usec)
    result = "#{result}.#{sprintf("%06d", value.usec)}"
  end
  result = "#{result.sub(/^-/, '')} BC" if value.year < 0
  result
end

#recreate_database(name, options = {}) ⇒ Object 



697
698
699
700
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 697

def recreate_database(name, options = {})
  drop_database(name)
  create_database(name, options)
end

#release_savepoint(name = current_savepoint_name) ⇒ Object 



403
404
405
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 403

def release_savepoint(name = current_savepoint_name)
  log("RELEASE SAVEPOINT #{name}", 'Savepoint') { super }
end

#remove_index!(table_name, index_name) ⇒ Object 



1175
1176
1177
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1175

def remove_index!(table_name, index_name)
  execute "DROP INDEX #{quote_table_name(index_name)}"
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object 



1165
1166
1167
1168
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1165

def rename_column(table_name, column_name, new_column_name)
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(new_column_name)}"
  rename_column_indexes(table_name, column_name, new_column_name) if respond_to?(:rename_column_indexes) # AR-4.0 SchemaStatements
end

#rename_index(table_name, old_name, new_name) ⇒ Object 



1179
1180
1181
1182
1183
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1179

def rename_index(table_name, old_name, new_name)
  validate_index_length!(table_name, new_name) if respond_to?(:validate_index_length!)

  execute "ALTER INDEX #{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}"
end

#rename_table(table_name, new_name) ⇒ Object 



1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1048

def rename_table(table_name, new_name)
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
  pk, seq = pk_and_sequence_for(new_name)
  if seq == "#{table_name}_#{pk}_seq"
    new_seq = "#{new_name}_#{pk}_seq"
    idx = "#{table_name}_pkey"
    new_idx = "#{new_name}_pkey"
    execute "ALTER TABLE #{quote_table_name(seq)} RENAME TO #{quote_table_name(new_seq)}"
    execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_table_name(new_idx)}"
  end
  rename_table_indexes(table_name, new_name) if respond_to?(:rename_table_indexes) # AR-4.0 SchemaStatements
end

#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object

Resets sequence to the max value of the table's primary key if present.



461
462
463
464
465
466
467
468
469
470
471
472
473
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 461

def reset_pk_sequence!(table, pk = nil, sequence = nil)
  if ! pk || ! sequence
    default_pk, default_sequence = pk_and_sequence_for(table)
    pk ||= default_pk; sequence ||= default_sequence
  end
  if pk && sequence
    quoted_sequence = quote_column_name(sequence)

    select_value <<-end_sql, 'Reset Sequence'
      SELECT setval('#{quoted_sequence}', (SELECT COALESCE(MAX(#{quote_column_name pk})+(SELECT increment_by FROM #{quoted_sequence}), (SELECT min_value FROM #{quoted_sequence})) FROM #{quote_table_name(table)}), false)
    end_sql
  end
end

#rollback_to_savepoint(name = current_savepoint_name) ⇒ Object 



398
399
400
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 398

def rollback_to_savepoint(name = current_savepoint_name)
  log("ROLLBACK TO SAVEPOINT #{name}", 'Savepoint') { super }
end

#schema_creation ⇒ Object 



55
56
57
 
# File 'lib/arjdbc/postgresql/schema_creation.rb', line 55

def schema_creation
  SchemaCreation.new self
end

#schema_exists?(name) ⇒ Boolean

Returns true if schema exists.

Returns:

  • (Boolean) 


622
623
624
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 622

def schema_exists?(name)
  select_value("SELECT COUNT(*) FROM pg_namespace WHERE nspname = '#{name}'", 'SCHEMA').to_i > 0
end

#schema_names ⇒ Object

Returns an array of schema names.



613
614
615
616
617
618
619
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 613

def schema_names
  select_values(
    "SELECT nspname FROM pg_namespace" <<
    " WHERE nspname !~ '^pg_.*' AND nspname NOT IN ('information_schema')" <<
    " ORDER by nspname;",
  'SCHEMA')
end

#schema_search_path ⇒ Object

Returns the active schema search path.



662
663
664
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 662

def schema_search_path
  @schema_search_path ||= select_value('SHOW search_path', 'SCHEMA')
end

#schema_search_path=(schema_csv) ⇒ Object

Sets the schema search path to a string of comma-separated schema names. Names beginning with $ have to be quoted (e.g. $user => '$user'). See: http://www.postgresql.org/docs/current/static/ddl-schemas.html

This should be not be called manually but set in database.yml.



671
672
673
674
675
676
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 671

def schema_search_path=(schema_csv)
  if schema_csv
    execute "SET search_path TO #{schema_csv}"
    @schema_search_path = schema_csv
  end
end

#session_auth=(user) ⇒ Object

Set the authorized user for this session.



441
442
443
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 441

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

#set_client_encoding(encoding) ⇒ Object 



97
98
99
100
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 97

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

Enable standard-conforming strings if available.



308
309
310
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 308

def set_standard_conforming_strings
  self.standard_conforming_strings=(true)
end

#sql_for_insert(sql, pk, id_value, sequence_name, binds) ⇒ Object 



561
562
563
564
565
566
567
568
569
570
571
572
573
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 561

def sql_for_insert(sql, pk, id_value, sequence_name, binds)
  unless pk
    # Extract the table from the insert sql. Yuck.
    table_ref = extract_table_ref_from_insert_sql(sql)
    pk = primary_key(table_ref) if table_ref
  end

  if pk && use_insert_returning?
    sql = "#{sql} RETURNING #{quote_column_name(pk)}"
  end

  [ sql, binds ]
end

#standard_conforming_strings=(enable) ⇒ Object

Enable standard-conforming strings if available.



313
314
315
316
317
318
319
320
321
322
323
324
325
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 313

def standard_conforming_strings=(enable)
  client_min_messages = self.client_min_messages
  begin
    self.client_min_messages = 'panic'
    value = enable ? "on" : "off"
    execute("SET standard_conforming_strings = #{value}", 'SCHEMA')
    @standard_conforming_strings = ( value == "on" )
  rescue
    @standard_conforming_strings = :unsupported
  ensure
    self.client_min_messages = client_min_messages
  end
end

#standard_conforming_strings? ⇒ Boolean

Returns:

  • (Boolean) 


327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 327

def standard_conforming_strings?
  if @standard_conforming_strings.nil?
    client_min_messages = self.client_min_messages
    begin
      self.client_min_messages = 'panic'
      value = select_one('SHOW standard_conforming_strings', 'SCHEMA')['standard_conforming_strings']
      @standard_conforming_strings = ( value == "on" )
    rescue
      @standard_conforming_strings = :unsupported
    ensure
      self.client_min_messages = client_min_messages
    end
  end
  @standard_conforming_strings == true # return false if :unsupported
end

#structure_dump ⇒ Object

Deprecated.

no longer used - handled with (AR built-in) Rake tasks



760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 760

def structure_dump
  database = @config[:database]
  if database.nil?
    if @config[:url] =~ /\/([^\/]*)$/
      database = $1
    else
      raise "Could not figure out what database this url is for #{@config["url"]}"
    end
  end

  ENV['PGHOST']     = @config[:host] if @config[:host]
  ENV['PGPORT']     = @config[:port].to_s if @config[:port]
  ENV['PGPASSWORD'] = @config[:password].to_s if @config[:password]
  search_path = "--schema=#{@config[:schema_search_path]}" if @config[:schema_search_path]

  @connection.connection.close
  begin
    definition = `pg_dump -i -U "#{@config[:username]}" -s -x -O #{search_path} #{database}`
    raise "Error dumping database" if $?.exitstatus == 1

    # need to patch away any references to SQL_ASCII as it breaks the JDBC driver
    definition.gsub(/SQL_ASCII/, 'UNICODE')
  ensure
    reconnect!
  end
end

#supports_ddl_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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

def supports_ddl_transactions?; true end

#supports_disable_referential_integrity? ⇒ Boolean

Returns:

  • (Boolean) 


1025
1026
1027
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1025

def supports_disable_referential_integrity?
  true
end

#supports_extensions? ⇒ Boolean

Returns:

  • (Boolean) 


407
408
409
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 407

def supports_extensions?
  postgresql_version >= 90200
end

#supports_foreign_keys? ⇒ Boolean

Returns:

  • (Boolean) 


1185
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1185

def supports_foreign_keys?; true end

#supports_hex_escaped_bytea? ⇒ Boolean

Returns:

  • (Boolean) 


359
360
361
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 359

def supports_hex_escaped_bytea?
  postgresql_version >= 90000
end

#supports_index_sort_order? ⇒ Boolean

Returns:

  • (Boolean) 


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

def supports_index_sort_order?; true end

#supports_insert_with_returning? ⇒ Boolean

Returns:

  • (Boolean) 


363
364
365
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 363

def supports_insert_with_returning?
  postgresql_version >= 80200
end

#supports_migrations? ⇒ Boolean

Does PostgreSQL support migrations?

Returns:

  • (Boolean) 


344
345
346
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 344

def supports_migrations?
  true
end

#supports_partial_index? ⇒ Boolean

Returns:

  • (Boolean) 


373
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 373

def supports_partial_index?; true end

#supports_primary_key? ⇒ Boolean

Does PostgreSQL support finding primary key on non-Active Record tables?

Returns:

  • (Boolean) 


349
350
351
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 349

def supports_primary_key?
  true
end

#supports_ranges? ⇒ Boolean

Range data-types weren't introduced until PostgreSQL 9.2.

Returns:

  • (Boolean) 


376
377
378
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 376

def supports_ranges?
  postgresql_version >= 90200
end

#supports_savepoints? ⇒ Boolean

Returns:

  • (Boolean) 


390
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 390

def supports_savepoints?; true end

#supports_standard_conforming_strings? ⇒ Boolean

Does PostgreSQL support standard conforming strings?

Returns:

  • (Boolean) 


354
355
356
357
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 354

def supports_standard_conforming_strings?
  standard_conforming_strings?
  @standard_conforming_strings != :unsupported
end

#supports_transaction_isolation?(level = nil) ⇒ Boolean

Returns:

  • (Boolean) 


369
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 369

def supports_transaction_isolation?; true end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 


385
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 385

def supports_views?; true end

#table_alias_length ⇒ Object

Returns the configured supported identifier length supported by PostgreSQL, or report the default of 63 on PostgreSQL 7.x.



447
448
449
450
451
452
453
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 447

def table_alias_length
  @table_alias_length ||= (
    postgresql_version >= 80000 ?
      select_one('SHOW max_identifier_length')['max_identifier_length'].to_i :
        63
  )
end

#table_exists?(name) ⇒ Boolean

Returns true if table exists. If the schema is not specified as part of +name+ then it will only find tables within the current schema search path (regardless of permissions to access tables in other schemas)

Returns:

  • (Boolean) 


1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1320

def table_exists?(name)
  schema, table = extract_schema_and_table(name.to_s)
  return false unless table

  binds = [[nil, table]]
  binds << [nil, schema] if schema

  sql = "#{TABLE_EXISTS_SQL_PREFIX} AND n.nspname = #{schema ? "?" : 'ANY (current_schemas(false))'}"

  log(sql, 'SCHEMA', binds) do
    @connection.execute_query_raw(sql, binds).first['table_count'] > 0
  end
end

#tables(name = nil) ⇒ Object 



1303
1304
1305
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1303

def tables(name = nil)
  select_values(TABLES_SQL, 'SCHEMA')
end

#truncate(table_name, name = nil) ⇒ Object 



1338
1339
1340
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 1338

def truncate(table_name, name = nil)
  execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name
end

#type_cast(value, column, array_member = false) ⇒ Object 



179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 179

def type_cast(value, column, array_member = false)
  return super(value, nil) unless column

  case value
  when String
    return super(value, column) unless 'bytea' == column.sql_type
    value # { :value => value, :format => 1 }
  when Array
    case column.sql_type
    when 'point'
      jdbc_column_class.point_to_string(value)
    when 'json', 'jsonb'
      jdbc_column_class.json_to_string(value)
    else
      return super(value, column) unless column.array?
      jdbc_column_class.array_to_string(value, column, self)
    end
  when NilClass
    if column.array? && array_member
      'NULL'
    elsif column.array?
      value
    else
      super(value, column)
    end
  when Hash
    case column.sql_type
    when 'hstore'
      jdbc_column_class.hstore_to_string(value, array_member)
    when 'json', 'jsonb'
      jdbc_column_class.json_to_string(value)
    else super(value, column)
    end
  when IPAddr
    return super unless column.sql_type == 'inet' || column.sql_type == 'cidr'
    jdbc_column_class.cidr_to_string(value)
  when Range
    return super(value, column) unless /range$/ =~ column.sql_type
    jdbc_column_class.range_to_string(value)
  else
    super(value, column)
  end
end

#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object

Maps logical Rails types to PostgreSQL-specific data types.



142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 142

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  when 'binary'
    # PostgreSQL doesn't support limits on binary (bytea) columns.
    # The hard limit is 1Gb, because of a 32-bit size field, and TOAST.
    case limit
    when nil, 0..0x3fffffff; super(type)
    else raise(ActiveRecordError, "No binary type has byte size #{limit}.")
    end
  when 'text'
    # PostgreSQL doesn't support limits on text columns.
    # The hard limit is 1Gb, according to section 8.3 in the manual.
    case limit
    when nil, 0..0x3fffffff; super(type)
    else raise(ActiveRecordError, "The limit on text can be at most 1GB - 1byte.")
    end
  when 'integer'
    return 'integer' unless limit

    case limit
      when 1, 2; 'smallint'
      when 3, 4; 'integer'
      when 5..8; 'bigint'
      else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a numeric with precision 0 instead.")
    end
  when 'datetime'
    return super unless precision

    case precision
      when 0..6; "timestamp(#{precision})"
      else raise(ActiveRecordError, "No timestamp type has precision of #{precision}. The allowed range of precision is from 0 to 6")
    end
  else
    super
  end
end

#use_insert_returning? ⇒ Boolean

Returns:

  • (Boolean) 


90
91
92
93
94
95
 
# File 'lib/arjdbc/postgresql/adapter.rb', line 90

def use_insert_returning?
  if @use_insert_returning.nil?
    @use_insert_returning = supports_insert_with_returning?
  end
  @use_insert_returning
end