How to store/retrieve an Apache-poi workbook object into/from Oracle blob column?

Question

Java 1.7, Apache-poi-3.8, JDBC

Requirements : 1) Create a workbook object with full data (which is coming from the DB).without any file creation at server.

HSSFWorkbook wb = new HSSFWorkbook(); // this object I want to store in DB blob column, without any file creation at server.

insertDataToCells(wb, "output", data); // this method will insert data in cells of workbook.

**//TODO code to store wb in blob column.** // How to store ?

2) Retrieve the data(workbook) from blob and convert this into excel and send into mail attachment

// TODO How to retrive

Following Approach :

byte[] byteArray = wb.getBytes();
InputStream is = new ByteArrayInputStream(byteArray);
ps.setBinaryStream(1, is, 1000000); // Here i am having some confusion 
ps.execute // Successfully stored in blob column.

While retrieving getting error file corrupted.

Answer 1

You need to set properly the number of bytes in the stream so in your case it should rather be:

byte[] byteArray = wb.getBytes();
ps.setBinaryStream(1, new ByteArrayInputStream(byteArray), byteArray.length);
...

Then to retrieve the content of your column as an InputStream use getBinaryStream(String columnLabel) or getBinaryStream(int columnIndex) .