Instance methods for datasets that connect to an SQLite database
SQLite does not support pattern matching via regular expressions. SQLite is case insensitive (depending on pragma), so use LIKE for ILIKE.
# File lib/sequel/adapters/shared/sqlite.rb, line 292 def complex_expression_sql(op, args) case op when :~, :'!~', :'~*', :'!~*' raise Error, "SQLite does not support pattern matching via regular expressions" when :LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE' # SQLite is case insensitive for ASCII, and non case sensitive for other character sets "#{'NOT ' if [:'NOT LIKE', :'NOT ILIKE'].include?(op)}(#{literal(args.at(0))} LIKE #{literal(args.at(1))})" else super(op, args) end end
SQLite performs a TRUNCATE style DELETE if no filter is specified. Since we want to always return the count of records, add a condition that is always true and then delete.
# File lib/sequel/adapters/shared/sqlite.rb, line 312 def delete @opts[:where] ? super : filter(1=>1).delete end
Return an array of strings specifying a query explanation for a SELECT of the current dataset.
# File lib/sequel/adapters/shared/sqlite.rb, line 318 def explain db.send(:metadata_dataset).clone(:sql=>"EXPLAIN #{select_sql}"). map{|x| "#{x[:addr]}|#{x[:opcode]}|#{(1..5).map{|i| x[:"p#{i}"]}.join('|')}|#{x[:comment]}"} end
HAVING requires GROUP BY on SQLite
# File lib/sequel/adapters/shared/sqlite.rb, line 324 def having(*cond, &block) raise(InvalidOperation, "Can only specify a HAVING clause on a grouped dataset") unless @opts[:group] super end
SQLite uses the nonstandard ` (backtick) for quoting identifiers.
# File lib/sequel/adapters/shared/sqlite.rb, line 330 def quoted_identifier(c) "`#{c}`" end
SQLite does not support INTERSECT ALL or EXCEPT ALL
# File lib/sequel/adapters/shared/sqlite.rb, line 335 def supports_intersect_except_all? false end
SQLite does not support IS TRUE
# File lib/sequel/adapters/shared/sqlite.rb, line 340 def supports_is_true? false end
SQLite does not support multiple columns for the IN/NOT IN operators
# File lib/sequel/adapters/shared/sqlite.rb, line 345 def supports_multiple_column_in? false end
SQLite supports timezones in literal timestamps, since it stores them as text.
# File lib/sequel/adapters/shared/sqlite.rb, line 351 def supports_timestamp_timezones? true end
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