Question

I currently have an application that inserts byte[] into our DB through the use of Spring JDBC [SqlLobValue]. The problem is, this is not a scalable way to take in data, as the server is buffering all the data in memory before writing to the database. I would like to stream the data from the HttpServletRequest Inputstream, but all the constructors I can find for any classes that take an Inputstream as an argument also require the content length as an argument. I do not, and will not, require the user to know the content length when POSTing data to my application. Is there a way around this limitation?

I can find no documentation about what happens if I pass -1 for content length, but my guess is it will throw an Exception. I’m not sure why they couldn’t just have the stream keep reading until the read(…) returns -1, the required behavior of an InputStream.

Answer 1

I presume you meant ‘InputStream’ rather than ‘OutputStream’. I tried this out, but I was having bigger problems with my JDBC driver, so I am unsure if this actually works.

InputStream inputStream = httpServletRequest.getInputStream();  int contentLength = -1; // fake, will be ignored anyway SqlLobValue sqlLobValue = new SqlLobValue(     inputStream,     contentLength,     new DefaultLobHandler() {         public LobCreator getLobCreator() {             return new DefaultLobHandler.DefaultLobCreator() {                 public void setBlobAsBinaryStream(PreparedStatement ps, int paramIndex, InputStream binaryStream, int contentLength) throws SQLException {                     // The contentLength parameter should be the -1 we provided earlier.                     // You now have direct access to the PreparedStatement.                     // Simply avoid calling setBinaryStream(int, InputStream, int)                     // in favor of setBinaryStream(int, InputStream).                     ps.setBinaryStream(paramIndex, binaryStream);                 }             };         }     } );  jdbcTemplate.update(     'INSERT INTO foo (bar) VALUES (?)',     new Object[]{ sqlLobValue } );