在 blob Oracle 中查找工作表名称

Question

Oracle table1.data 中有一个 blob test.xlsb 文件。在 test.xlsb 中有一个工作表 'Hello'。但是脚本

SELECT
    CASE DBMS_LOB.instr(t.data, UTL_RAW.cast_to_raw('Hello'))
    WHEN 0 THEN 'No such line' ELSE 'Okay' END res
FROM table1 t;

return'No such line'。为什么？我们如何解决“*.xlsb 文件是否有包含特定 [sheet.name] 的工作表？”的问题？当然，我们假设我们不能只打开Excel中的文件，看看是否有这样的工作表。

Answer 1

试试这个

select *
  from table1
 where dbms_lob.instr (t1, -- the blob column of table
                   utl_raw.cast_to_raw ('Hello'), -- the search string 
                   1, -- starting pointoffset
                   1 -- the which occurance 
                 ) > 0; -- location of text

Answer 2

答案类似于

DECLARE
    l_old_file       BLOB;
    l_new_file       BLOB;
    l_files          apex_zip.t_files;
    l_document       BLOB;
    l_clob           CLOB;
    l_dest_offsset   INTEGER;
    l_src_offsset    INTEGER;
    l_lang_context   INTEGER := DBMS_LOB.default_lang_ctx;
    l_warning        INTEGER;
BEGIN
    SELECT t.data INTO  l_old_file 
    FROM table1 t;

    -- Get a list of all the file names contained within the zip
    l_files := apex_zip.get_files (l_old_file);

    -- Loop through all the files adding each one to the new zip
    FOR i IN l_files.FIRST .. l_files.LAST
    LOOP
        l_document := apex_zip.get_file_content (l_old_file, l_files (i));
        DBMS_LOB.createTemporary (lob_loc => l_clob, cache => FALSE);
        l_dest_offsset := 1;
        l_src_offsset := 1;

        DBMS_LOB.converttoclob (dest_lob       => l_clob,
                                src_blob       => l_document,
                                amount         => DBMS_LOB.lobmaxsize,
                                dest_offset    => l_dest_offsset,
                                src_offset     => l_src_offsset,
                                blob_csid      => DBMS_LOB.default_csid,
                                lang_context   => l_lang_context,
                                warning        => l_warning);

            result := INSTR(l_clob, str)
            EXIT WHEN res > 0;

            l_dest_offsset := 1;
            l_src_offsset := 1;

            DBMS_LOB.CONVERTTOBLOB (dest_lob       => l_document,
                                    src_clob       => l_clob,
                                    amount         => DBMS_LOB.lobmaxsize,
                                    dest_offset    => l_dest_offsset,
                                    src_offset     => l_src_offsset,
                                    blob_csid      => DBMS_LOB.default_csid,
                                    lang_context   => l_lang_context,
                                    warning        => l_warning);
    END LOOP;

    DBMS_OUTPUT.put_line(res);
END;

在 blob Oracle 中查找工作表名称

Find worksheet name in blob Oracle

sql

oracle

blob