Question

create table test_clob
(
    id number,
    text clob
);

insert into test_clob values
(2,'Hi This can be a value that is too much old');

select * from test_clob;

SET serveroutput ON;
DECLARE
  vlength pls_integer;
  text_cbl CLOB;
  Var_temp1 VARCHAR2(1024);
  starti    number := 1;
  offset number:= 1;
  val pls_integer;
  amt pls_integer := 0;
BEGIN
  SELECT text INTO text_cbl FROM test_clob WHERE id = 2;
  vlength     := SYS.DBMS_lob.getlength(text_cbl);
  WHILE(starti < vlength)
  LOOP
      val := sys.dbms_lob.instr(text_cbl,chr(32),offset);
      amt := val - offset;
      sys.dbms_lob.read(text_cbl,amt,starti,Var_temp1);
      dbms_output.put_line(Var_temp1);
      offset := val;
      starti := val + 1;
  END LOOP;
END;

Answer 1

在某些时候会有行尾或文本没有空格ch（32）所以在那一点它返回val＆lt; = 0所以val - offset返回一个负值到amt所以sys.dbms_lob 。读取超出范围的偏移值。保持检查行尾或文本，或者你可以把条件和条件一样，如果val＆gt;偏移然后阅读。

ORA-21560：参数2为null，无效或超出范围

1 个答案: