On UTF8 connection:
isc_get_segment from V_T_TEST.MEMO_UTF8 V_T_TEST.MEMO_WIN1250 returns buffer as utf-8 string
but
isc_put_segment on V_T_TEST.MEMO_UTF8 with buffer as utf-8 is OK
isc_put_segment on V_T_TEST.MEMO_WIN1250 with buffer as utf-8 not transliterate character set and stores in table incorrect as utf-8
isc_put_segment on V_T_TEST.MEMO_WIN1250 with buffer as win1250 report error malformed string

on table T_TEST isc_get_segment, isc_put_segment with buffer utf-8 works OK


CREATE TABLE T_TEST (
    ID UID NOT NULL /* UID = BIGINT */,
    MEMO_UTF8 MEMO_UTF8 /* MEMO_UTF8 = BLOB SUB_TYPE 1 SEGMENT SIZE 100 */,
    MEMO_WIN1250 MEMO_WIN1250 /* MEMO_WIN1250 = BLOB SUB_TYPE 1 SEGMENT SIZE 100 */,
    MEMO_OCTETS MEMO_OCTETS /* MEMO_OCTETS = BLOB SUB_TYPE 1 SEGMENT SIZE 100 */
);

ALTER TABLE T_TEST ADD CONSTRAINT PK_T_TEST PRIMARY KEY (ID);

CREATE OR ALTER VIEW V_T_TEST(
    ID,
    MEMO_UTF8,
    MEMO_WIN1250,
    MEMO_OCTETS)
AS
SELECT
  T.ID,
  T.MEMO_UTF8,
  T.MEMO_WIN1250,
  T.MEMO_OCTETS
FROM T_TEST T
;

SET TERM ^ ;


/* Trigger: V_T_TEST_BD */
CREATE OR ALTER TRIGGER V_T_TEST_BD FOR V_T_TEST
ACTIVE BEFORE DELETE POSITION 0
AS
BEGIN
  DELETE FROM T_TEST
  WHERE ID = OLD.ID;
END
^


/* Trigger: V_T_TEST_BI */
CREATE OR ALTER TRIGGER V_T_TEST_BI FOR V_T_TEST
ACTIVE BEFORE INSERT POSITION 0
AS
BEGIN
  INSERT INTO T_TEST(
    ID,
    MEMO_UTF8,
    MEMO_WIN1250,
    MEMO_OCTETS)
  VALUES(
    NEW.ID,
    NEW.MEMO_UTF8,
    NEW.MEMO_WIN1250,
    NEW.MEMO_OCTETS);
END
^


/* Trigger: V_T_TEST_BU */
CREATE OR ALTER TRIGGER V_T_TEST_BU FOR V_T_TEST
ACTIVE BEFORE UPDATE POSITION 0
AS
BEGIN
  UPDATE T_TEST SET
    ID = NEW.ID,
    MEMO_UTF8 = NEW.MEMO_UTF8,
    MEMO_WIN1250 = NEW.MEMO_WIN1250,
    MEMO_OCTETS = NEW.MEMO_OCTETS
  WHERE ID = OLD.ID;
END
^

SET TERM ; ^