模式：
CREATE OR REPLACE TYPE 类型名 as OBJECT （属性名 属性类型,...）;
举例：
CREATE OR REPLACE TYPE BITS_IDX_BASE AS OBJECT ( NAME VARCHAR2(4000), FIELDS VARCHAR2(4000), CREATE_DATE VARCHAR2(4000), INCREMENT_DATE VARCHAR2(4000) );
CREATE OR REPLACE TYPE BITS_IDX_BASE_TBL AS TABLE OF BITS_IDX_BASE;
自定义类型可用于函数的返回类型：
FUNCTION LIST_BASE return BITS_IDX_BASE_TBL
as
c utl_tcp.connection; -- TCP/IP connection to the Web server
ret_val pls_integer;
lastRow varchar(3000);
currentRow varchar(3000);
idx_base_table BITS_IDX_BASE_TBL := BITS_IDX_BASE_TBL();
tmp_pos1 number;
tmp_pos2 number;
tmp_pos3 number;
BEGIN
c := utl_tcp.open_connection(remote_host => currentIdxServerAdr,
remote_port => currentIdxServerPort); -- open connection
ret_val := utl_tcp.write_line(c, 'BITS_IDX_TCP_CMD'); -- send TCP request
ret_val := utl_tcp.write_line(c, 'LISTBASE');
BEGIN
utl_tcp.flush(c);
currentRow := utl_tcp.get_line(c, TRUE);
--currentRow := utl_tcp.get_line(c, TRUE);
lastRow := null;
LOOP
currentRow := utl_tcp.get_line(c, TRUE);
if lastRow is not null then
--dbms_output.put_line(lastRow);
tmp_pos1 := instr(lastRow, '||',1,1);
tmp_pos2 := instr(lastRow, '||',1,2);
tmp_pos3 := instr(lastRow, '||',1,3);
idx_base_table.extend;
idx_base_table(idx_base_table.count) := BITS_IDX_BASE(substr(lastRow, 1, tmp_pos1 - 1), substr(lastRow, tmp_pos1 + 2, tmp_pos2 - tmp_pos1 - 2), substr(lastRow, tmp_pos2 + 2, tmp_pos3 - tmp_pos2 - 2), substr(lastRow, tmp_pos3 + 2));
end if;
lastRow := currentRow;
--dbms_output.put_line(utl_tcp.get_line(c, TRUE)); -- read result
END LOOP;
EXCEPTION
WHEN utl_tcp.end_of_input THEN
NULL; -- end of input
WHEN OTHERS THEN
NULL;
END;
utl_tcp.close_connection(c);
return idx_base_table;
END;
