Module: Sequel::Oracle::DatasetMethods
- Includes:
- EmulateOffsetWithRowNumber
- Included in:
- JDBC::Oracle::Dataset, Dataset
- Defined in:
- lib/sequel/adapters/shared/oracle.rb
Constant Summary collapse
- SELECT_CLAUSE_METHODS =
Dataset.clause_methods(:select, %w'with select distinct columns from join where group having compounds order lock')
- ROW_NUMBER_EXPRESSION =
LiteralString.new('ROWNUM').freeze
- SPACE =
Dataset::SPACE
- APOS =
Dataset::APOS
- APOS_RE =
Dataset::APOS_RE
- DOUBLE_APOS =
Dataset::DOUBLE_APOS
- FROM =
Dataset::FROM
- BITCOMP_OPEN =
"((0 - ".freeze
- BITCOMP_CLOSE =
") - 1)".freeze
- TIMESTAMP_FORMAT =
"TIMESTAMP '%Y-%m-%d %H:%M:%S%N %z'".freeze
- TIMESTAMP_OFFSET_FORMAT =
"%+03i:%02i".freeze
- BOOL_FALSE =
"'N'".freeze
- BOOL_TRUE =
"'Y'".freeze
- HSTAR =
"H*".freeze
- DUAL =
['DUAL'.freeze].freeze
Instance Method Summary collapse
- #complex_expression_sql_append(sql, op, args) ⇒ Object
-
#constant_sql_append(sql, c) ⇒ Object
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.
-
#empty? ⇒ Boolean
Use a custom expression with EXISTS to determine whether a dataset is empty.
-
#emulated_function_sql_append(sql, f) ⇒ Object
Oracle treats empty strings like NULL values, and doesn’t support char_length, so make char_length use length with a nonempty string.
-
#except(dataset, opts = OPTS) ⇒ Object
Oracle uses MINUS instead of EXCEPT, and doesn’t support EXCEPT ALL.
-
#recursive_cte_requires_column_aliases? ⇒ Boolean
Oracle requires recursive CTEs to have column aliases.
-
#requires_sql_standard_datetimes? ⇒ Boolean
Oracle requires SQL standard datetimes.
-
#select_sql ⇒ Object
Handle LIMIT by using a unlimited subselect filtered with ROWNUM.
-
#sequence(s) ⇒ Object
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.
-
#supports_group_cube? ⇒ Boolean
Oracle supports GROUP BY CUBE.
-
#supports_group_rollup? ⇒ Boolean
Oracle supports GROUP BY ROLLUP.
-
#supports_intersect_except_all? ⇒ Boolean
Oracle does not support INTERSECT ALL or EXCEPT ALL.
-
#supports_is_true? ⇒ Boolean
Oracle does not support IS TRUE.
-
#supports_select_all_and_column? ⇒ Boolean
Oracle does not support SELECT *, column.
-
#supports_timestamp_timezones? ⇒ Boolean
Oracle supports timezones in literal timestamps.
-
#supports_where_true? ⇒ Boolean
Oracle does not support WHERE ‘Y’ for WHERE TRUE.
-
#supports_window_functions? ⇒ Boolean
Oracle supports window functions.
Instance Method Details
#complex_expression_sql_append(sql, op, args) ⇒ Object
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# File 'lib/sequel/adapters/shared/oracle.rb', line 245 def complex_expression_sql_append(sql, op, args) case op when :& sql << complex_expression_arg_pairs(args){|a, b| "CAST(BITAND(#{literal(a)}, #{literal(b)}) AS INTEGER)"} when :| sql << complex_expression_arg_pairs(args) do |a, b| s1 = '' complex_expression_sql_append(s1, :&, [a, b]) "(#{literal(a)} - #{s1} + #{literal(b)})" end when :^ sql << complex_expression_arg_pairs(args) do |*x| s1 = '' s2 = '' complex_expression_sql_append(s1, :|, x) complex_expression_sql_append(s2, :&, x) "(#{s1} - #{s2})" end when :'B~' sql << BITCOMP_OPEN literal_append(sql, args.at(0)) sql << BITCOMP_CLOSE when :<< sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * power(2, #{literal(b)}))"} when :>> sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / power(2, #{literal(b)}))"} when :% sql << complex_expression_arg_pairs(args){|a, b| "MOD(#{literal(a)}, #{literal(b)})"} else super end end |
#constant_sql_append(sql, c) ⇒ Object
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.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 281 def constant_sql_append(sql, c) if c == :CURRENT_TIME super(sql, :CURRENT_TIMESTAMP) else super end end |
#empty? ⇒ Boolean
Use a custom expression with EXISTS to determine whether a dataset is empty.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 311 def empty? db[:dual].where(@opts[:offset] ? exists : unordered.exists).get(1) == nil end |
#emulated_function_sql_append(sql, f) ⇒ Object
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.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 294 def emulated_function_sql_append(sql, f) case f.f when :char_length literal_append(sql, Sequel::SQL::Function.new(:length, Sequel.join([f.args.first, 'x'])) - 1) else super end end |
#except(dataset, opts = OPTS) ⇒ Object
Oracle uses MINUS instead of EXCEPT, and doesn’t support EXCEPT ALL
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# File 'lib/sequel/adapters/shared/oracle.rb', line 304 def except(dataset, opts=OPTS) raise(Sequel::Error, "EXCEPT ALL not supported") if opts[:all] compound_clone(:minus, dataset, opts) end |
#recursive_cte_requires_column_aliases? ⇒ Boolean
Oracle requires recursive CTEs to have column aliases.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 343 def recursive_cte_requires_column_aliases? true end |
#requires_sql_standard_datetimes? ⇒ Boolean
Oracle requires SQL standard datetimes
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# File 'lib/sequel/adapters/shared/oracle.rb', line 316 def requires_sql_standard_datetimes? true end |
#select_sql ⇒ Object
Handle LIMIT by using a unlimited subselect filtered with ROWNUM.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 328 def select_sql if (limit = @opts[:limit]) && !@opts[:sql] ds = clone(:limit=>nil) # Lock doesn't work in subselects, so don't use a subselect when locking. # Don't use a subselect if custom SQL is used, as it breaks somethings. ds = ds.from_self unless @opts[:lock] sql = @opts[:append_sql] || '' subselect_sql_append(sql, ds.where(SQL::ComplexExpression.new(:<=, ROW_NUMBER_EXPRESSION, limit))) sql else super end end |
#sequence(s) ⇒ Object
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.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 323 def sequence(s) clone(:sequence=>s) end |
#supports_group_cube? ⇒ Boolean
Oracle supports GROUP BY CUBE
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# File 'lib/sequel/adapters/shared/oracle.rb', line 348 def supports_group_cube? true end |
#supports_group_rollup? ⇒ Boolean
Oracle supports GROUP BY ROLLUP
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# File 'lib/sequel/adapters/shared/oracle.rb', line 353 def supports_group_rollup? true end |
#supports_intersect_except_all? ⇒ Boolean
Oracle does not support INTERSECT ALL or EXCEPT ALL
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# File 'lib/sequel/adapters/shared/oracle.rb', line 358 def supports_intersect_except_all? false end |
#supports_is_true? ⇒ Boolean
Oracle does not support IS TRUE.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 363 def supports_is_true? false end |
#supports_select_all_and_column? ⇒ Boolean
Oracle does not support SELECT *, column
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# File 'lib/sequel/adapters/shared/oracle.rb', line 368 def supports_select_all_and_column? false end |
#supports_timestamp_timezones? ⇒ Boolean
Oracle supports timezones in literal timestamps.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 373 def true end |
#supports_where_true? ⇒ Boolean
Oracle does not support WHERE ‘Y’ for WHERE TRUE.
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# File 'lib/sequel/adapters/shared/oracle.rb', line 378 def supports_where_true? false end |
#supports_window_functions? ⇒ Boolean
Oracle supports window functions
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# File 'lib/sequel/adapters/shared/oracle.rb', line 383 def supports_window_functions? true end |