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 198 198: def cast_sql_append(sql, expr, type) 199: if(type == String) 200: sql << CAST_STRING_OPEN 201: literal_append(sql, expr) 202: sql << CAST_STRING_CLOSE 203: else 204: super 205: end 206: 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 210 210: def complex_expression_sql_append(sql, op, args) 211: case op 212: when :ILIKE 213: super(sql, :LIKE, [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1)) ]) 214: when "NOT ILIKE""NOT ILIKE" 215: super(sql, "NOT LIKE""NOT LIKE", [SQL::Function.new(:upper, args.at(0)), SQL::Function.new(:upper, args.at(1)) ]) 216: when :&, :|, :^ 217: # works with db2 v9.5 and after 218: op = BITWISE_METHOD_MAP[op] 219: sql << complex_expression_arg_pairs(args){|a, b| literal(SQL::Function.new(op, a, b))} 220: when :<< 221: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 222: when :>> 223: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 224: when 'B~''B~' 225: literal_append(sql, SQL::Function.new(:BITNOT, *args)) 226: when :extract 227: sql << args.at(0).to_s 228: sql << PAREN_OPEN 229: literal_append(sql, args.at(1)) 230: sql << PAREN_CLOSE 231: else 232: super 233: end 234: end