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在儲存過程中操作ORACLE CLOB欄位

下面的 儲存過程演示了大資料不能一次插入資料庫的分批插入法,用到了ORACLE CLOB欄位

CREATE OR REPLACE PROCEDURE INSERT_RES_PEOPLE_ADD
(
 r_people_cname          varchar2,
 r_people_intro          varchar2
)
AS
r_intro_clob clob;--
buffer  varchar2(32767);
amount  number := 2000;
offset  number := 1;
BEGIN
  select clobf into r_intro_clob from ztable where RES_CLASS_ID = 9;
  if r_intro_clob is null then
    update ztable set clobf = 'buffer' where RES_CLASS_ID = 9;

    return ;
  end if;
  

  amount := dbms_lob.getlength(r_intro_clob);
  dbms_lob.read(r_intro_clob,amount,offset,buffer);
  buffer := buffer || r_people_intro;

 update ztable set clobf = buffer where RES_CLASS_ID = 9;
EXCEPTION

    when others then
    rollback;
    --raise;
    return;
END;