9.2.4.CREATE METHOD Statement

     ( parameter, .... ) [ RETURNS data_type ] FOR type_name

  parameter : { IN | OUT | INOUT } identifier data_type

For the SQL user defined types every method should be defined in order to be callable. It is an error to call CREATE METHOD for a non-SQL type's methods (as the methods are implemented in some other non-SQL language).

There is no DROP METHOD as each CREATE METHOD will override the current method definition (if any). The method name, parameter types and the return type should match exactly the method declaration (method_specification in CREATE TYPE).

The method name for the constructors is the name of the type (without the qualifier and the owner).

For the constructor and instance methods there is a variable named SELF (in scope for the compound statement defining the method) representing the current type instance.

The method members and other methods are not in scope in the method's compound statement. They should be accessed through the SELF variable.

Example9.6.Simple method demonstration

This example defines the two parameter constructor for the UDT_TEST type. It sets the values for the type members A and B to the values of the constructor parameters. This example uses the SQL200n syntax for method mutators (see below).

create constructor method UDT_TEST (in _a integer, in _b integer)
  for UDT_TEST
  SELF := A(SELF, _a);
  SELF := B(SELF, _b);
  return SELF;

This defines the static method _ADD for the type UDT_TEST. Note that it does not use SELF - it would be a syntax error to do so.

create static method _ADD (in a1 integer, in a2 integer)
  for UDT_TEST
  return a1 + a2;