DECLARE
    attrbVal VARCHAR2(5);
    updateAttrbVal varchar2(1);
BEGIN
    Select Attrb_val into attrbVal from system_feature_config where feature_attrb = 'Distributor Group';
    DBMS_OUTPUT.PUT_LINE(attrbVal);
    IF (attrbVal = 'ON') then
        updateAttrbVal := '1';
    ELSE
        updateAttrbVal := '0';
    END IF;
        EXECUTE IMMEDIATE 'Update system_feature_config SET Attrb_val= '''||updateAttrbVal||''' WHERE feature_attrb=''VA_STATE_TAX_TYPE''';
    COMMIT;
END;

plsql块继续执行，必须手动停止执行