Class | Sequel::JDBC::Derby::Dataset |
In: |
lib/sequel/adapters/jdbc/derby.rb
|
Parent: | JDBC::Dataset |
PAREN_CLOSE | = | Dataset::PAREN_CLOSE |
PAREN_OPEN | = | Dataset::PAREN_OPEN |
OFFSET | = | Dataset::OFFSET |
CAST_STRING_OPEN | = | "RTRIM(".freeze |
BITCOMP_OPEN | = | "((0 - ".freeze |
BITCOMP_CLOSE | = | ") - 1)".freeze |
BLOB_OPEN | = | "CAST(X'".freeze |
BLOB_CLOSE | = | "' AS BLOB)".freeze |
HSTAR | = | "H*".freeze |
TIME_FORMAT | = | "'%H:%M:%S'".freeze |
DEFAULT_FROM | = | " FROM sysibm.sysdummy1".freeze |
ROWS | = | " ROWS".freeze |
FETCH_FIRST | = | " FETCH FIRST ".freeze |
ROWS_ONLY | = | " ROWS ONLY".freeze |
BOOL_TRUE | = | '(1 = 1)'.freeze |
BOOL_FALSE | = | '(1 = 0)'.freeze |
SELECT_CLAUSE_METHODS | = | clause_methods(:select, %w'select distinct columns from join where group having compounds order limit lock') |
Derby doesn‘t support an expression between CASE and WHEN, so emulate it by using an equality statement for all of the conditions.
# File lib/sequel/adapters/jdbc/derby.rb, line 141 141: def case_expression_sql_append(sql, ce) 142: if ce.expression? 143: e = ce.expression 144: case_expression_sql_append(sql, ::Sequel::SQL::CaseExpression.new(ce.conditions.map{|c, r| [::Sequel::SQL::BooleanExpression.new('=''=', e, c), r]}, ce.default)) 145: else 146: super 147: end 148: end
If the type is String, trim the extra spaces since CHAR is used instead of varchar. This can cause problems if you are casting a char/varchar to a string and the ending whitespace is important.
# File lib/sequel/adapters/jdbc/derby.rb, line 153 153: def cast_sql_append(sql, expr, type) 154: if type == String 155: sql << CAST_STRING_OPEN 156: super 157: sql << PAREN_CLOSE 158: else 159: super 160: end 161: end
Handle Derby specific LIKE, extract, and some bitwise compliment support.
# File lib/sequel/adapters/jdbc/derby.rb, line 164 164: def complex_expression_sql_append(sql, op, args) 165: case op 166: when :ILIKE 167: super(sql, :LIKE, [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1))]) 168: when "NOT ILIKE""NOT ILIKE" 169: super(sql, "NOT LIKE""NOT LIKE", [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1))]) 170: when :&, :|, :^, :<<, :>> 171: raise Error, "Derby doesn't support the #{op} operator" 172: when 'B~''B~' 173: sql << BITCOMP_OPEN 174: literal_append(sql, args.at(0)) 175: sql << BITCOMP_CLOSE 176: when :extract 177: sql << args.at(0).to_s << PAREN_OPEN 178: literal_append(sql, args.at(1)) 179: sql << PAREN_CLOSE 180: else 181: super 182: end 183: end