class Sequel::JDBC::HSQLDB::Dataset
Public Instance Methods
complex_expression_sql_append(sql, op, args)
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Handle HSQLDB
specific case insensitive LIKE and bitwise operator support.
Calls superclass method
Sequel::Dataset#complex_expression_sql_append
# 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?()
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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?()
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supports_cte?(type=:select)
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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?()
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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?()
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HSQLDB
supports lateral subqueries.
# File lib/sequel/adapters/jdbc/hsqldb.rb 180 def supports_lateral_subqueries? 181 true 182 end
supports_merge?()
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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