module Sequel::Oracle::DatasetMethods

Constants

BITAND_PROC
ROW_NUMBER_EXPRESSION

Public Instance Methods

complex_expression_sql_append(sql, op, args) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/oracle.rb
336 def complex_expression_sql_append(sql, op, args)
337   case op
338   when :&
339     complex_expression_arg_pairs_append(sql, args, &BITAND_PROC)
340   when :|
341     complex_expression_arg_pairs_append(sql, args){|a, b| Sequel.lit(["(", " - ", " + ", ")"], a, complex_expression_arg_pairs([a, b], &BITAND_PROC), b)}
342   when :^
343     complex_expression_arg_pairs_append(sql, args) do |*x|
344       s1 = complex_expression_arg_pairs(x){|a, b| Sequel.lit(["(", " - ", " + ", ")"], a, complex_expression_arg_pairs([a, b], &BITAND_PROC), b)}
345       s2 = complex_expression_arg_pairs(x, &BITAND_PROC)
346       Sequel.lit(["(", " - ", ")"], s1, s2)
347     end
348   when :~, :'!~', :'~*', :'!~*'
349     raise InvalidOperation, "Pattern matching via regular expressions is not supported in this Oracle version" unless supports_regexp?
350     if op == :'!~' || op == :'!~*'
351       sql << 'NOT '
352     end
353     sql << 'REGEXP_LIKE('
354     literal_append(sql, args[0])
355     sql << ','
356     literal_append(sql, args[1])
357     if op == :'~*' || op == :'!~*'
358       sql << ", 'i'"
359     end
360     sql << ')'
361   when :%, :<<, :>>, :'B~'
362     complex_expression_emulate_append(sql, op, args)
363   else
364     super
365   end
366 end
constant_sql_append(sql, c) click to toggle source

Oracle doesn't support CURRENT_TIME, as it doesn't have a type for storing just time values without a date, so use CURRENT_TIMESTAMP in its place.

Calls superclass method
    # File lib/sequel/adapters/shared/oracle.rb
371 def constant_sql_append(sql, c)
372   if c == :CURRENT_TIME
373     super(sql, :CURRENT_TIMESTAMP)
374   else
375     super
376   end
377 end
empty?() click to toggle source

Use a custom expression with EXISTS to determine whether a dataset is empty.

    # File lib/sequel/adapters/shared/oracle.rb
387 def empty?
388   db[:dual].where(@opts[:offset] ? exists : unordered.exists).get(1) == nil
389 end
except(dataset, opts=OPTS) click to toggle source

Oracle uses MINUS instead of EXCEPT, and doesn't support EXCEPT ALL

    # File lib/sequel/adapters/shared/oracle.rb
380 def except(dataset, opts=OPTS)
381   raise(Sequel::Error, "EXCEPT ALL not supported") if opts[:all]
382   compound_clone(:minus, dataset, opts)
383 end
recursive_cte_requires_column_aliases?() click to toggle source

Oracle requires recursive CTEs to have column aliases.

    # File lib/sequel/adapters/shared/oracle.rb
439 def recursive_cte_requires_column_aliases?
440   true
441 end
requires_sql_standard_datetimes?() click to toggle source

Oracle requires SQL standard datetimes

    # File lib/sequel/adapters/shared/oracle.rb
392 def requires_sql_standard_datetimes?
393   true
394 end
select_sql() click to toggle source

Handle LIMIT by using a unlimited subselect filtered with ROWNUM, unless Oracle 12 is used.

Calls superclass method
    # File lib/sequel/adapters/shared/oracle.rb
405 def select_sql
406   return super if @opts[:sql]
407   return super if supports_fetch_next_rows?
408 
409   o = @opts[:offset]
410   if o && o != 0
411     columns = clone(:append_sql=>String.new, :placeholder_literal_null=>true).columns
412     dsa1 = dataset_alias(1)
413     rn = row_number_column
414     limit = @opts[:limit]
415     ds = unlimited.
416       from_self(:alias=>dsa1).
417       select_append(ROW_NUMBER_EXPRESSION.as(rn)).
418       from_self(:alias=>dsa1).
419       select(*columns).
420       where(SQL::Identifier.new(rn) > o)
421     ds = ds.where(SQL::Identifier.new(rn) <= Sequel.+(o, limit)) if limit
422     sql = @opts[:append_sql] || String.new
423     subselect_sql_append(sql, ds)
424     sql
425   elsif limit = @opts[:limit]
426     ds = unlimited
427     # Lock doesn't work in subselects, so don't use a subselect when locking.
428     # Don't use a subselect if custom SQL is used, as it breaks somethings.
429     ds = ds.from_self unless @opts[:lock]
430     sql = @opts[:append_sql] || String.new
431     subselect_sql_append(sql, ds.where(SQL::ComplexExpression.new(:<=, ROW_NUMBER_EXPRESSION, limit)))
432     sql
433   else
434     super
435   end
436 end
sequence(s) click to toggle source

Create a copy of this dataset associated to the given sequence name, which will be used when calling insert to find the most recently inserted value for the sequence.

    # File lib/sequel/adapters/shared/oracle.rb
399 def sequence(s)
400   clone(:sequence=>s)
401 end
server_version() click to toggle source

The version of the database server

    # File lib/sequel/adapters/shared/oracle.rb
529 def server_version
530   db.server_version(@opts[:server])
531 end
supports_cte?(type=:select) click to toggle source
    # File lib/sequel/adapters/shared/oracle.rb
443 def supports_cte?(type=:select)
444   type == :select
445 end
supports_derived_column_lists?() click to toggle source

Oracle does not support derived column lists

    # File lib/sequel/adapters/shared/oracle.rb
448 def supports_derived_column_lists?
449   false
450 end
supports_fetch_next_rows?() click to toggle source

Oracle supports FETCH NEXT ROWS since 12c, but it doesn't work when locking or when skipping locked rows.

    # File lib/sequel/adapters/shared/oracle.rb
454 def supports_fetch_next_rows?
455   server_version >= 12000000 && !(@opts[:lock] || @opts[:skip_locked])
456 end
supports_group_cube?() click to toggle source

Oracle supports GROUP BY CUBE

    # File lib/sequel/adapters/shared/oracle.rb
459 def supports_group_cube?
460   true
461 end
supports_group_rollup?() click to toggle source

Oracle supports GROUP BY ROLLUP

    # File lib/sequel/adapters/shared/oracle.rb
464 def supports_group_rollup?
465   true
466 end
supports_grouping_sets?() click to toggle source

Oracle supports GROUPING SETS

    # File lib/sequel/adapters/shared/oracle.rb
469 def supports_grouping_sets?
470   true
471 end
supports_intersect_except_all?() click to toggle source

Oracle does not support INTERSECT ALL or EXCEPT ALL

    # File lib/sequel/adapters/shared/oracle.rb
474 def supports_intersect_except_all?
475   false
476 end
supports_is_true?() click to toggle source

Oracle does not support IS TRUE.

    # File lib/sequel/adapters/shared/oracle.rb
479 def supports_is_true?
480   false
481 end
supports_limits_in_correlated_subqueries?() click to toggle source

Oracle does not support limits in correlated subqueries.

    # File lib/sequel/adapters/shared/oracle.rb
484 def supports_limits_in_correlated_subqueries?
485   false
486 end
supports_merge?() click to toggle source

Oracle supports MERGE

    # File lib/sequel/adapters/shared/oracle.rb
489 def supports_merge?
490   true
491 end
supports_nowait?() click to toggle source

Oracle supports NOWAIT.

    # File lib/sequel/adapters/shared/oracle.rb
494 def supports_nowait?
495   true
496 end
supports_offsets_in_correlated_subqueries?() click to toggle source

Oracle does not support offsets in correlated subqueries.

    # File lib/sequel/adapters/shared/oracle.rb
499 def supports_offsets_in_correlated_subqueries?
500   false
501 end
supports_regexp?() click to toggle source

Oracle 10+ supports pattern matching via regular expressions

    # File lib/sequel/adapters/shared/oracle.rb
534 def supports_regexp?
535   server_version >= 10010002
536 end
supports_select_all_and_column?() click to toggle source

Oracle does not support SELECT *, column

    # File lib/sequel/adapters/shared/oracle.rb
504 def supports_select_all_and_column?
505   false
506 end
supports_skip_locked?() click to toggle source

Oracle supports SKIP LOCKED.

    # File lib/sequel/adapters/shared/oracle.rb
509 def supports_skip_locked?
510   true
511 end
supports_timestamp_timezones?() click to toggle source

Oracle supports timezones in literal timestamps.

    # File lib/sequel/adapters/shared/oracle.rb
514 def supports_timestamp_timezones?
515   true
516 end
supports_where_true?() click to toggle source

Oracle does not support WHERE 'Y' for WHERE TRUE.

    # File lib/sequel/adapters/shared/oracle.rb
519 def supports_where_true?
520   false
521 end
supports_window_functions?() click to toggle source

Oracle supports window functions

    # File lib/sequel/adapters/shared/oracle.rb
524 def supports_window_functions?
525   true
526 end

Private Instance Methods

_merge_when_conditions_sql(sql, data) click to toggle source

Handle Oracle's non-standard MERGE WHEN condition syntax.

    # File lib/sequel/adapters/shared/oracle.rb
597 def _merge_when_conditions_sql(sql, data)
598   if data.has_key?(:conditions)
599     sql << " WHERE "
600     literal_append(sql, _normalize_merge_when_conditions(data[:conditions]))
601   end
602 end
_merge_when_sql(sql) click to toggle source

Handle Oracle's non standard MERGE syntax

    # File lib/sequel/adapters/shared/oracle.rb
556 def _merge_when_sql(sql)
557   raise Error, "no WHEN [NOT] MATCHED clauses provided for MERGE" unless merge_when = @opts[:merge_when]
558   insert = update = delete = nil
559   types = merge_when.map{|d| d[:type]}
560   raise Error, "Oracle does not support multiple INSERT, UPDATE, or DELETE clauses in MERGE" if types != types.uniq
561 
562   merge_when.each do |data|
563     case data[:type]
564     when :insert
565       insert = data
566     when :update
567       update = data
568     else # when :delete
569       delete = data
570     end
571   end
572 
573   if delete
574     raise Error, "Oracle does not support DELETE without UPDATE clause in MERGE" unless update
575     raise Error, "Oracle does not support DELETE without conditions clause in MERGE" unless delete.has_key?(:conditions)
576   end
577 
578   if update
579     sql << " WHEN MATCHED"
580     _merge_update_sql(sql, update)
581     _merge_when_conditions_sql(sql, update)
582 
583     if delete
584       sql << " DELETE"
585       _merge_when_conditions_sql(sql, delete)
586     end
587   end
588 
589   if insert
590     sql << " WHEN NOT MATCHED"
591     _merge_insert_sql(sql, insert)
592     _merge_when_conditions_sql(sql, insert)
593   end
594 end
_normalize_merge_when_conditions(conditions) click to toggle source

Handle nil, false, and true MERGE WHEN conditions to avoid non-boolean type error.

    # File lib/sequel/adapters/shared/oracle.rb
542 def _normalize_merge_when_conditions(conditions)
543   case conditions
544   when nil, false
545     {1=>0}
546   when true
547     {1=>1}
548   when Sequel::SQL::DelayedEvaluation
549     Sequel.delay{_normalize_merge_when_conditions(conditions.call(self))}
550   else
551     conditions
552   end
553 end
allow_preparing_prepared_statements?() click to toggle source

Allow preparing prepared statements, since determining the prepared sql to use for a prepared statement requires calling prepare on that statement.

    # File lib/sequel/adapters/shared/oracle.rb
606 def allow_preparing_prepared_statements?
607   true
608 end
as_sql_append(sql, aliaz, column_aliases=nil) click to toggle source

Oracle doesn't support the use of AS when aliasing a dataset. It doesn't require the use of AS anywhere, so this disables it in all cases. Oracle also does not support derived column lists in aliases.

    # File lib/sequel/adapters/shared/oracle.rb
613 def as_sql_append(sql, aliaz, column_aliases=nil)
614   raise Error, "oracle does not support derived column lists" if column_aliases
615   sql << ' '
616   quote_identifier_append(sql, aliaz)
617 end
default_timestamp_format() click to toggle source

The strftime format to use when literalizing the time.

    # File lib/sequel/adapters/shared/oracle.rb
620 def default_timestamp_format
621   "TIMESTAMP '%Y-%m-%d %H:%M:%S%N %z'"
622 end
empty_from_sql() click to toggle source
    # File lib/sequel/adapters/shared/oracle.rb
624 def empty_from_sql
625   ' FROM DUAL'
626 end
emulate_function?(name) click to toggle source

There is no function on Oracle that does character length and respects trailing spaces (datalength respects trailing spaces, but counts bytes instead of characters). Use a hack to work around the trailing spaces issue.

    # File lib/sequel/adapters/shared/oracle.rb
632 def emulate_function?(name)
633   name == :char_length
634 end
emulate_function_sql_append(sql, f) click to toggle source

Oracle treats empty strings like NULL values, and doesn't support char_length, so make char_length use length with a nonempty string. Unfortunately, as Oracle treats the empty string as NULL, there is no way to get trim to return an empty string instead of nil if the string only contains spaces.

    # File lib/sequel/adapters/shared/oracle.rb
641 def emulate_function_sql_append(sql, f)
642   if f.name == :char_length
643     literal_append(sql, Sequel::SQL::Function.new(:length, Sequel.join([f.args.first, 'x'])) - 1)
644   end
645 end
execute_insert(sql, opts=OPTS) click to toggle source

If this dataset is associated with a sequence, return the most recently inserted sequence value.

Calls superclass method
    # File lib/sequel/adapters/shared/oracle.rb
649 def execute_insert(sql, opts=OPTS)
650   opts = Hash[opts]
651   if f = @opts[:from]
652     opts[:table] = f.first
653   end
654   opts[:sequence] = @opts[:sequence]
655   super
656 end
format_timestamp_offset(hour, minute) click to toggle source

Use a colon for the timestamp offset, since Oracle appears to require it.

    # File lib/sequel/adapters/shared/oracle.rb
659 def format_timestamp_offset(hour, minute)
660   sprintf("%+03i:%02i", hour, minute)
661 end
insert_supports_empty_values?() click to toggle source

Oracle doesn't support empty values when inserting.

    # File lib/sequel/adapters/shared/oracle.rb
664 def insert_supports_empty_values?
665   false
666 end
literal_blob_append(sql, v) click to toggle source

Use string in hex format for blob data.

    # File lib/sequel/adapters/shared/oracle.rb
669 def literal_blob_append(sql, v)
670   sql << "'" << v.unpack("H*").first << "'"
671 end
literal_false() click to toggle source

Oracle uses 'N' for false values.

    # File lib/sequel/adapters/shared/oracle.rb
674 def literal_false
675   "'N'"
676 end
literal_string_append(sql, v) click to toggle source

Oracle uses the SQL standard of only doubling ' inside strings.

    # File lib/sequel/adapters/shared/oracle.rb
679 def literal_string_append(sql, v)
680   sql << "'" << v.gsub("'", "''") << "'"
681 end
literal_true() click to toggle source

Oracle uses 'Y' for true values.

    # File lib/sequel/adapters/shared/oracle.rb
684 def literal_true
685   "'Y'"
686 end
multi_insert_sql_strategy() click to toggle source

Oracle can insert multiple rows using a UNION

    # File lib/sequel/adapters/shared/oracle.rb
689 def multi_insert_sql_strategy
690   :union
691 end
select_limit_sql(sql) click to toggle source
    # File lib/sequel/adapters/shared/oracle.rb
693 def select_limit_sql(sql)
694   return unless supports_fetch_next_rows?
695 
696   if offset = @opts[:offset]
697     sql << " OFFSET "
698     literal_append(sql, offset)
699     sql << " ROWS"
700   end
701 
702   if limit = @opts[:limit]
703     sql << " FETCH NEXT "
704     literal_append(sql, limit)
705     sql << " ROWS ONLY"
706   end
707 end
select_lock_sql(sql) click to toggle source

Use SKIP LOCKED if skipping locked rows.

Calls superclass method
    # File lib/sequel/adapters/shared/oracle.rb
710 def select_lock_sql(sql)
711   super
712 
713   if @opts[:lock]
714     if @opts[:skip_locked]
715       sql << " SKIP LOCKED"
716     elsif @opts[:nowait]
717       sql << " NOWAIT"
718     end
719   end
720 end
supports_quoted_function_names?() click to toggle source

Oracle supports quoted function names.

    # File lib/sequel/adapters/shared/oracle.rb
723 def supports_quoted_function_names?
724   true
725 end