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Image load to Sybase from JDBC

Posted on 1997-03-27
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Last Modified: 2008-03-06
Hey,

we're trying to store and retrieve GIF files to a Sybase System 11 server from (originally) disk files. We're using J++ as the development environment and WebLogic's JDBC driver as the interface.

We are having a problem where if a table has an image field in it, then JDBC cannot open the table.

What we want to know:

Is this a limitation of only the WebLogic driver, or do other JDBC drivers have the same problem?

If someone else has gotten the WebLogic driver to work, how? Could you provide us with the configuration information or sample code showing the retrieve?

Thanks
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Question by:tharlan
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Expert Comment

by:donnyt
ID: 1219288
We're not using WebLogic, but we're using Connect (http://www.connectsw.com).  For Sybase, you need to do something like:
      
      /*
      Setup connnections, try/catch, create Statement stmt,                   ResultSet rs, send SQL query and get ResultSet rs, etc..
      */
      ..

      InputStream is = rs.getBinaryStream(1);
      is.skip(2);      // For Sybase, skip 2 bytes for Images
      is.read(buffer, 0, imageSize);

      ..      
      /*  buffer is a byte[] array, imageSize is some number
          of bytes you want to read
      */

      Once image is in memory as byte[] (buffer, in the above             example), you can preprocess it and use MemoryImageSource
      to create an Image.
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trof earned 400 total points
ID: 1219289
JDBC does not implemented in J++ (yet). Do you use MS JDK 2.0 prerelease or just classes from Sun JDK , and what kind of JDBC driver (sorry I know nothing about WebLogic's)? If it's J++ & SunJDK  & JDBC/ODBC bridge - it definitely won't work - MS did not implement native methods calls properly(actually, they did not promice to do it). Try to use MS JDK 2.0, but remember, it's beta, so, nothing is garanteed. J++ and JDBC still don't like each other...
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