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} |
EMULATED_FUNCTION_MAP | = | {:char_length=>'length'.freeze} |
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 |
HSTAR | = | "H*".freeze |
BLOB_OPEN | = | "BLOB(X'".freeze |
BLOB_CLOSE | = | "')".freeze |
DB2 casts strings using RTRIM and CHAR instead of VARCHAR.
# File lib/sequel/adapters/shared/db2.rb, line 247 247: def cast_sql_append(sql, expr, type) 248: if(type == String) 249: sql << CAST_STRING_OPEN 250: literal_append(sql, expr) 251: sql << CAST_STRING_CLOSE 252: else 253: super 254: end 255: end
# File lib/sequel/adapters/shared/db2.rb, line 257 257: def complex_expression_sql_append(sql, op, args) 258: case op 259: when :&, :|, :^ 260: # works with db2 v9.5 and after 261: op = BITWISE_METHOD_MAP[op] 262: sql << complex_expression_arg_pairs(args){|a, b| literal(SQL::Function.new(op, a, b))} 263: when :<< 264: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 265: when :>> 266: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 267: when :% 268: sql << complex_expression_arg_pairs(args){|a, b| "MOD(#{literal(a)}, #{literal(b)})"} 269: when 'B~''B~' 270: literal_append(sql, SQL::Function.new(:BITNOT, *args)) 271: when :extract 272: sql << args.at(0).to_s 273: sql << PAREN_OPEN 274: literal_append(sql, args.at(1)) 275: sql << PAREN_CLOSE 276: else 277: super 278: end 279: end