CLOB를 여러 VARCHAR2 행으로 변환하는 방법은 무엇입니까?

Question

현재 CLOB 인 단일 열 (COMMENTS)이 있습니다. 내가 COMMENTS CLOB 칼럼을 oracle SQL의 분리 된 (4k) VARCHAR2 컬럼으로 나눌 수있는 방법이 있습니까?

create or replace procedure longsubstr(p_rowid in rowid, 
             comment in comment) 
          return varchar2 
          as l_tmp long; 
          begin 
          select COMMENT into l_tmp from table_name 
                where rowid = p_rowid; 
          return substr(l_tmp, p_form, p_for); 
          end; 
          /

Answer 1

SQLFIDDLE :

SELECT DBMS_LOB.SUBSTR(t.comments, 4000, l.COLUMN_VALUE) 
FROM table_name t 
     CROSS JOIN 
     TABLE(
     CAST(
      MULTISET(
      SELECT LEVEL * 4000 - 3999 
      FROM DUAL 
      CONNECT BY LEVEL * 4000 - 3999 <= DBMS_LOB.GETLENGTH(t.comments) 
      ) AS SYS.ODCINUMBERLIST 
     ) 
     ) l 

또는

이

WITH positions (comments, pos) AS (
    SELECT comments, 
     1 
    FROM table_name 
UNION ALL 
    SELECT comments, 
     pos + 4000 
    FROM positions 
    WHERE pos + 4000 <= DBMS_LOB.GETLENGTH(comments) 
) 
SELECT DBMS_LOB.SUBSTR(comments, 4000, pos) AS split_comment 
FROM positions 

Answer 2

당신은

0을 사용할 수 있습니다 여기에

사전

에서

덕분에 아래에있는 내 시도는

dbms_lob.substr(clob_column, for_how_many_bytes, from_which_byte) 기능이에 대한

: 동적 코드와 PLSQL을 통해

declare 
    type typ_comment is table of varchar2(4000); 
    v_varchar typ_comment := typ_comment(); 
    v_clob table_name.comments%type; 
    k   number; 
    j   number := 4000; 
begin 
    select comments into v_clob from table_name where rowid = '&p_rowid'; -- like AAAS9BAAEAAAAEeAAA without quotation 
    k := ceil(dbms_lob.getlength(v_clob)/j); 
    v_varchar.extend(k); 
    for i in 1..k 
    loop 
    v_varchar(i):= dbms_lob.substr(v_clob, j, 1 + j * (i - 1)); 
    end loop; 
end;