从plsql传出/返回的CLOB值(指定了无效的LOB定位符:ORA-22275) [英] CLOB value in out/return from plsql (invalid LOB locator specified: ORA-22275)

问题描述

我已经存储了plsql过程，该过程从文件中提取大文本

I've got stored plsql procedure, that takes big text from file

create or replace 
procedure dbst_load_a_file( p_file_name in varchar2, l_clob  out  clob )
    as
        l_bfile   bfile;
        dst_offset  number := 1 ;
        src_offset  number := 1 ;
        lang_ctx    number := DBMS_LOB.DEFAULT_LANG_CTX;
        warning     number;
    begin
        l_bfile := bfilename( 'SCHEMES_OF_PS', p_file_name );
        dbms_lob.fileopen( l_bfile );
        dbms_lob.loadclobfromfile(
          DEST_LOB     => l_clob
        , SRC_BFILE    => l_bfile
        , AMOUNT       => dbms_lob.getlength( l_bfile )
        , DEST_OFFSET  => dst_offset
        , SRC_OFFSET   => src_offset
        , BFILE_CSID   => DBMS_LOB.DEFAULT_CSID
        , LANG_CONTEXT => lang_ctx
        , WARNING      => warning);
        dbms_lob.fileclose( l_bfile );
    end;

然后我尝试以这种方式使用它:

and then I try to use it in this way:

  insert into SCHEME_SOURCE (SOURCE, ID, CODE) 
  values (exec dbst_load_a_file( 'SCHEMES_OF_PS', 'Konotop.svg' ), 15, 'Konotop');

或更正确:

declare
  myVal clob := empty_clob();

begin
  DBMS_OUTPUT.PUT_LINE(myVal);
  dbst_load_a_file('Konotop.svg', myVal);
  DBMS_OUTPUT.PUT_LINE(myVal);
end;

在第二种情况下，我得到一个错误

In the second case I get an error

PL/SQL:数字或值错误:指定了无效的LOB定位符: ORA-22275

PL/SQL: numeric or value error: invalid LOB locator specified: ORA-22275

在第一种情况下，我怀疑语法不存在.

in the first case, I suspect that syntax does not exist.

如何从已存储的plsql中从使用它的过程/函数中取出/返回CLOB参数

How can I out/return CLOB parameter form the procedure/function for use it out of stored plsql

如果我有此代码

create or replace
function dbst_load_a_file2( p_file_name in varchar2 ) return clob
    is
        l_clob  clob;
        l_bfile   bfile;
        dst_offset  number := 1 ;
        src_offset  number := 1 ;
        lang_ctx    number := DBMS_LOB.DEFAULT_LANG_CTX;
        warning     number;
    begin
        l_bfile := bfilename( 'SCHEMES_OF_PS', p_file_name );
        dbms_lob.fileopen( l_bfile );
        dbms_lob.loadclobfromfile( 
          DEST_LOB     => l_clob
        , SRC_BFILE    => l_bfile
        , AMOUNT       => dbms_lob.getlength( l_bfile )
        , DEST_OFFSET  => dst_offset
        , SRC_OFFSET   => src_offset
        , BFILE_CSID   => DBMS_LOB.DEFAULT_CSID
        , LANG_CONTEXT => lang_ctx
        , WARNING      => warning);
        dbms_lob.fileclose( l_bfile );
        return l_clob;
    end;

  insert into SCHEME_SOURCE (SOURCE, ID, CODE) 
  values (dbst_load_a_file2('Konotop.svg' ), 15, 'Konotop');

然后再次出现错误

SQL错误:ORA-06502:PL/SQL:数字或值错误:指定的LOB定位器无效:ORA-22275 ORA-06512:位于"SYS.DBMS_LOB"行890中 ORA-06512:位于"VAG.DBST_LOAD_A_FILE2"的第12行

SQL Error: ORA-06502: PL/SQL: numeric or value error: invalid LOB locator specified: ORA-22275 ORA-06512: at "SYS.DBMS_LOB", line 890 ORA-06512: at "VAG.DBST_LOAD_A_FILE2", line 12

谢谢

推荐答案

此时:

    dbms_lob.loadclobfromfile(
      DEST_LOB     => l_clob

...您的l_clob OUT参数尚未初始化.将其设置为空CLOB也不起作用(因此，即使您将l_clob设置为IN OUT参数，它仍然会抱怨)

... your l_clob OUT parameter hasn't been initialised. Making it an empty CLOB doesn't work either (so even if you made l_clob an IN OUT parameter it would still complain) as the documentation for empty_clob mentions:

不能将此函数返回的定位符用作DBMS_LOB包或OCI的参数.

You cannot use the locator returned from this function as a parameter to the DBMS_LOB package or the OCI.

您可以改为使用临时CLOB，方法是在尝试使用dbms_lob.createtemporary(l_clob, true)之前添加对其的调用:

You can use a temporary CLOB instead, by adding a call to dbms_lob.createtemporary(l_clob, true) before you try to use it:

...
begin
    l_bfile := bfilename( 'SCHEMES_OF_PS', p_file_name );
    dbms_lob.fileopen( l_bfile );
    dbms_lob.createtemporary(l_clob, true);
    dbms_lob.loadclobfromfile(
      DEST_LOB     => l_clob
      ...

然后，您在调用它时不需要给出初始的空值:

And then you don't need to give an initial empty value when you call it:

declare
  myVal clob;
begin
  dbst_load_a_file('Konotop.svg', myVal);
  DBMS_OUTPUT.PUT_LINE(myVal);
end;
/

这也可以用作功能:

create or replace 
function dbst_load_a_file( p_file_name in varchar2) return clob
as
    l_clob    clob;
    l_bfile   bfile;
    dst_offset  number := 1 ;
    src_offset  number := 1 ;
    lang_ctx    number := DBMS_LOB.DEFAULT_LANG_CTX;
    warning     number;
begin
    l_bfile := bfilename( 'SCHEMES_OF_PS', p_file_name );
    dbms_lob.fileopen( l_bfile );
    dbms_lob.createtemporary(l_clob, true);
    dbms_lob.loadclobfromfile(
      DEST_LOB     => l_clob
    , SRC_BFILE    => l_bfile
    , AMOUNT       => dbms_lob.getlength( l_bfile )
    , DEST_OFFSET  => dst_offset
    , SRC_OFFSET   => src_offset
    , BFILE_CSID   => DBMS_LOB.DEFAULT_CSID
    , LANG_CONTEXT => lang_ctx
    , WARNING      => warning);
    dbms_lob.fileclose( l_bfile );
    return l_clob;
end;
/

select dbst_load_a_file('Konotop.svg') from dual;

或者在insert中使用，就像在您编辑的问题中一样.

Or use in an insert as in your edited question.

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