class Sequel::JDBC::HSQLDB::Dataset

Dataset class for HSQLDB datasets accessed via JDBC.

Constants

APOS
BLOB_OPEN
BOOL_FALSE
BOOL_TRUE
DEFAULT_FROM
HSTAR
SQL_WITH_RECURSIVE
TIME_FORMAT

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, line 153
def complex_expression_sql_append(sql, op, args)
  case op
  when :ILIKE, :"NOT ILIKE"
    super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), args.map{|v| SQL::Function.new(:ucase, v)})
  when :&, :|, :^, :%, :<<, :>>, :'B~'
    complex_expression_emulate_append(sql, op, args)
  else
    super
  end
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, line 165
def recursive_cte_requires_column_aliases?
  true
end
requires_sql_standard_datetimes?() click to toggle source

HSQLDB requires SQL standard datetimes in some places.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 170
def requires_sql_standard_datetimes?
  true
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, line 179
def supports_cte?(type=:select)
  false
end
supports_is_true?() click to toggle source

HSQLDB does not support IS TRUE.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 184
def supports_is_true?
  false
end
supports_lateral_subqueries?() click to toggle source

HSQLDB supports lateral subqueries.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 189
def supports_lateral_subqueries?
  true
end

Private Instance Methods

empty_from_sql() click to toggle source
# File lib/sequel/adapters/jdbc/hsqldb.rb, line 195
def empty_from_sql
  DEFAULT_FROM
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, line 200
def literal_blob_append(sql, v)
  sql << BLOB_OPEN << v.unpack(HSTAR).first << APOS
end
literal_false() click to toggle source

HSQLDB uses FALSE for false values.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 205
def literal_false
  BOOL_FALSE
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, line 210
def literal_sqltime(v)
  v.strftime(TIME_FORMAT)
end
literal_true() click to toggle source

HSQLDB uses TRUE for true values.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 215
def literal_true
  BOOL_TRUE
end
multi_insert_sql_strategy() click to toggle source

HSQLDB supports multiple rows in INSERT.

# File lib/sequel/adapters/jdbc/hsqldb.rb, line 220
def multi_insert_sql_strategy
  :values
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, line 225
def select_with_sql_base
  opts[:with].any?{|w| w[:recursive]} ? SQL_WITH_RECURSIVE : super
end