class Sequel::JDBC::H2::Dataset

Dataset class for H2 datasets accessed via JDBC.

Constants

APOS
BITCOMP_CLOSE
BITCOMP_OPEN
BITWISE_METHOD_MAP
H2_CLOB_METHOD
HSTAR
ILIKE_PLACEHOLDER
SELECT_CLAUSE_METHODS
TIME_FORMAT

Public Instance Methods

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

Emulate the case insensitive LIKE operator and the bitwise operators.

# File lib/sequel/adapters/jdbc/h2.rb, line 155
def complex_expression_sql_append(sql, op, args)
  case op
  when :ILIKE, :"NOT ILIKE"
    super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), [SQL::PlaceholderLiteralString.new(ILIKE_PLACEHOLDER, [args.at(0)]), args.at(1)])
  when :&, :|, :^
    sql << complex_expression_arg_pairs(args){|a, b| literal(SQL::Function.new(BITWISE_METHOD_MAP[op], a, b))}
  when :<<
    sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"}
  when :>>
    sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"}
  when :'B~'
    sql << BITCOMP_OPEN
    literal_append(sql, args.at(0))
    sql << BITCOMP_CLOSE
  else
    super
  end
end
requires_sql_standard_datetimes?() click to toggle source

H2 requires SQL standard datetimes

# File lib/sequel/adapters/jdbc/h2.rb, line 175
def requires_sql_standard_datetimes?
  true
end
supports_is_true?() click to toggle source

H2 doesn't support IS TRUE

# File lib/sequel/adapters/jdbc/h2.rb, line 180
def supports_is_true?
  false
end
supports_join_using?() click to toggle source

H2 doesn't support JOIN USING

# File lib/sequel/adapters/jdbc/h2.rb, line 185
def supports_join_using?
  false
end
supports_multiple_column_in?() click to toggle source

H2 doesn't support multiple columns in IN/NOT IN

# File lib/sequel/adapters/jdbc/h2.rb, line 190
def supports_multiple_column_in?
  false
end

Private Instance Methods

convert_type_proc(v) click to toggle source

Handle H2 specific clobs as strings.

Calls superclass method Sequel::JDBC::Dataset#convert_type_proc
# File lib/sequel/adapters/jdbc/h2.rb, line 205
def convert_type_proc(v)
  if v.is_a?(Java::OrgH2Jdbc::JdbcClob)
    H2_CLOB_METHOD
  else
    super
  end
end
literal_blob_append(sql, v) click to toggle source

H2 expects hexadecimal strings for blob values

# File lib/sequel/adapters/jdbc/h2.rb, line 214
def literal_blob_append(sql, v)
  sql << APOS << v.unpack(HSTAR).first << APOS
end
literal_sqltime(v) click to toggle source

H2 handles fractional seconds in timestamps, but not in times

# File lib/sequel/adapters/jdbc/h2.rb, line 219
def literal_sqltime(v)
  v.strftime(TIME_FORMAT)
end
select_clause_methods() click to toggle source
# File lib/sequel/adapters/jdbc/h2.rb, line 223
def select_clause_methods
  SELECT_CLAUSE_METHODS
end