class Sequel::JDBC::HSQLDB::Dataset

Public Instance Methods

complex_expression_sql_append(sql, op, args) click to toggle source

Handle HSQLDB specific case insensitive LIKE and bitwise operator support.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
144 def complex_expression_sql_append(sql, op, args)
145   case op
146   when :ILIKE, :"NOT ILIKE"
147     super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), args.map{|v| SQL::Function.new(:ucase, v)})
148   when :&, :|, :^, :%, :<<, :>>, :'B~'
149     complex_expression_emulate_append(sql, op, args)
150   else
151     super
152   end
153 end
recursive_cte_requires_column_aliases?() click to toggle source

HSQLDB requires recursive CTEs to have column aliases.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
156 def recursive_cte_requires_column_aliases?
157   true
158 end
requires_sql_standard_datetimes?() click to toggle source

HSQLDB requires SQL standard datetimes in some places.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
161 def requires_sql_standard_datetimes?
162   true
163 end
supports_cte?(type=:select) click to toggle source

HSQLDB does support common table expressions, but the support is broken. CTEs operate more like temprorary tables or views, lasting longer than the duration of the expression. CTEs in earlier queries might take precedence over CTEs with the same name in later queries. Also, if any CTE is recursive, all CTEs must be recursive. If you want to use CTEs with HSQLDB, you’ll have to manually modify the dataset to allow it.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
170 def supports_cte?(type=:select)
171   false
172 end
supports_is_true?() click to toggle source

HSQLDB does not support IS TRUE.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
175 def supports_is_true?
176   false
177 end
supports_lateral_subqueries?() click to toggle source

HSQLDB supports lateral subqueries.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
180 def supports_lateral_subqueries?
181   true
182 end
supports_merge?() click to toggle source

HSQLDB 2.3.4+ supports MERGE. Older versions also support MERGE, but not all features that are in Sequel’s tests.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
186 def supports_merge?
187   db.db_version >= 20304
188 end

Private Instance Methods

empty_from_sql() click to toggle source
    # File lib/sequel/adapters/jdbc/hsqldb.rb
192 def empty_from_sql
193   " FROM (VALUES (0))"
194 end
literal_blob_append(sql, v) click to toggle source

Use string in hex format for blob data.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
197 def literal_blob_append(sql, v)
198   sql << "X'" << v.unpack("H*").first << "'"
199 end
literal_false() click to toggle source

HSQLDB uses FALSE for false values.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
202 def literal_false
203   'FALSE'
204 end
literal_sqltime(v) click to toggle source

HSQLDB handles fractional seconds in timestamps, but not in times

    # File lib/sequel/adapters/jdbc/hsqldb.rb
207 def literal_sqltime(v)
208   v.strftime("'%H:%M:%S'")
209 end
literal_true() click to toggle source

HSQLDB uses TRUE for true values.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
212 def literal_true
213   'TRUE'
214 end
multi_insert_sql_strategy() click to toggle source

HSQLDB supports multiple rows in INSERT.

    # File lib/sequel/adapters/jdbc/hsqldb.rb
217 def multi_insert_sql_strategy
218   :values
219 end
select_with_sql_base() click to toggle source

Use WITH RECURSIVE instead of WITH if any of the CTEs is recursive

Calls superclass method Sequel::Dataset#select_with_sql_base
    # File lib/sequel/adapters/jdbc/hsqldb.rb
222 def select_with_sql_base
223   opts[:with].any?{|w| w[:recursive]} ? "WITH RECURSIVE " : super
224 end