Class Sequel::JDBC::HSQLDB::Dataset
In: lib/sequel/adapters/jdbc/hsqldb.rb
Parent: JDBC::Dataset

Dataset class for HSQLDB datasets accessed via JDBC.

Methods

Constants

BOOL_TRUE = 'TRUE'.freeze
BOOL_FALSE = 'FALSE'.freeze
SQL_WITH_RECURSIVE = "WITH RECURSIVE ".freeze
APOS = Dataset::APOS
HSTAR = "H*".freeze
BLOB_OPEN = "X'".freeze
DEFAULT_FROM = " FROM (VALUES (0))".freeze
TIME_FORMAT = "'%H:%M:%S'".freeze

Public Instance methods

Handle HSQLDB specific case insensitive LIKE and bitwise operator support.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 155
155:         def complex_expression_sql_append(sql, op, args)
156:           case op
157:           when :ILIKE, "NOT ILIKE""NOT ILIKE"
158:             super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|v| SQL::Function.new(:ucase, v)})
159:           when :&, :|, :^, :%, :<<, :>>, 'B~''B~'
160:             complex_expression_emulate_append(sql, op, args)
161:           else
162:             super
163:           end
164:         end

HSQLDB requires recursive CTEs to have column aliases.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 167
167:         def recursive_cte_requires_column_aliases?
168:           true
169:         end

HSQLDB requires SQL standard datetimes in some places.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 172
172:         def requires_sql_standard_datetimes?
173:           true
174:         end

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.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 181
181:         def supports_cte?(type=:select)
182:           false
183:         end

HSQLDB does not support IS TRUE.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 186
186:         def supports_is_true?
187:           false
188:         end

HSQLDB supports lateral subqueries.

[Source]

     # File lib/sequel/adapters/jdbc/hsqldb.rb, line 191
191:         def supports_lateral_subqueries?
192:           true
193:         end

[Validate]