| Module | Sequel::DB2::DatasetMethods |
| In: |
lib/sequel/adapters/shared/db2.rb
|
| PAREN_CLOSE | = | Dataset::PAREN_CLOSE |
| PAREN_OPEN | = | Dataset::PAREN_OPEN |
| BITWISE_METHOD_MAP | = | {:& =>:BITAND, :| => :BITOR, :^ => :BITXOR, :'B~'=>:BITNOT} |
| BOOL_TRUE | = | '1'.freeze |
| BOOL_FALSE | = | '0'.freeze |
| CAST_STRING_OPEN | = | "RTRIM(CHAR(".freeze |
| CAST_STRING_CLOSE | = | "))".freeze |
| FETCH_FIRST_ROW_ONLY | = | " FETCH FIRST ROW ONLY".freeze |
| FETCH_FIRST | = | " FETCH FIRST ".freeze |
| ROWS_ONLY | = | " ROWS ONLY".freeze |
| EMPTY_FROM_TABLE | = | ' FROM "SYSIBM"."SYSDUMMY1"'.freeze |
DB2 casts strings using RTRIM and CHAR instead of VARCHAR.
# File lib/sequel/adapters/shared/db2.rb, line 191
191: def cast_sql_append(sql, expr, type)
192: if(type == String)
193: sql << CAST_STRING_OPEN
194: literal_append(sql, expr)
195: sql << CAST_STRING_CLOSE
196: else
197: super
198: end
199: end
Handle DB2 specific LIKE and bitwise operator support, and emulate the extract method, which DB2 doesn‘t natively support.
# File lib/sequel/adapters/shared/db2.rb, line 203
203: def complex_expression_sql_append(sql, op, args)
204: case op
205: when :ILIKE
206: super(sql, :LIKE, [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1)) ])
207: when "NOT ILIKE""NOT ILIKE"
208: super(sql, "NOT LIKE""NOT LIKE", [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1)) ])
209: when :&, :|, :^
210: # works with db2 v9.5 and after
211: op = BITWISE_METHOD_MAP[op]
212: sql << complex_expression_arg_pairs(args){|a, b| literal(SQL::Function.new(op, a, b))}
213: when :<<
214: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"}
215: when :>>
216: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"}
217: when 'B~''B~'
218: literal_append(sql, SQL::Function.new(:BITNOT, *args))
219: when :extract
220: sql << args.at(0).to_s
221: sql << PAREN_OPEN
222: literal_append(sql, args.at(1))
223: sql << PAREN_CLOSE
224: else
225: super
226: end
227: end