QUery data to BLOB file and upload from APex

I have query that populate 68k records
Example Query is
1) Select empno,ename from emp;
table for Blob is
SQL> create table dummy_blob
( blob_id number ,
, blob_content_type varchar2(30)
, blob_size number
, blob_filename varchar2(100)
, blob_desc varchar2(100)
, the_blob blob );
What I need is
1) from html DB i need to place a button
When user press the Button
I need to call the database Package
and execute the query and store in BLOB table
2) After the query executed and writes the data in Blob Tables
I need to refresh the APex Screen Done
and Display the Report type as
ID File
with Download button
3) when user press the button pop up file_browser
and save it to xxx.csv file

any help plz

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QUery data to BLOB file and upload from APex

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