从Sybase插入/检索文件

Question

I am trying to insert a file containing into a Sybase database. I am using JConnect-7.0.7

Here is my table:

CREATE TABLE blob_test (  
blobVar IMAGE  
)

I am inserting the image using:

String sql = "INSERT INTO blob_test VALUES (convert(binary,?))";
PreparedStatement stmt = conn.prepareStatement(sql);
File image = new File(filePath);
InputStream fis = new FileInputStream(image);
int ilen=(int) image.length();
stmt.setBinaryStream(1, fis, ilen);
stmt.execute();

And trying to retrieve the image using:

JdbcTemplate jdbcTemplate= new JdbcTemplate(dataSource);
List<Blob> result = jdbcTemplate.query(
         "SELECT blobVar FROM blob_test", new Object[] {}, new RowMapper() {  
                @Override
                public Blob mapRow(ResultSet rs, int rowNum) throws SQLException {
                    return rs.getBlob(1);
                }
            });

for(int i=0;i<result.size();i++){
    Blob b = result.get(i);
    BufferedOutputStream os;

    os = new BufferedOutputStream(new FileOutputStream(new File("output"+i+".zip")));
    os.write(b.getBytes(1, (int) b.length()));
    os.flush();
    os.close();
 }

However, when I execute my code it outputs 1kb zip files that are corrupted. My code works exactly as it should for an oracle database.

Alternatively, I have also tried this code to retrieve the file:

JdbcTemplate jdbcTemplate= new JdbcTemplate(dataSource);
List<InputStream> result = jdbcTemplate.query(
         "SELECT * FROM blob_test", new Object[] {}, new RowMapper() {
                @Override
                public InputStream mapRow(ResultSet rs, int rowNum) throws SQLException {
                    return lobHandler.getBlobAsBinaryStream(rs, 1);
                }
            });

for(int i=0;i<result.size();i++){
   InputStream in = result.get(i);
   OutputStream out = new FileOutputStream(new File("outputTest"+i+".zip"));
   byte[] buff = new byte[4096];
   int len = 0;

   while ((len = in.read(buff)) != -1) {
       out.write(buff, 0, len);
   }

   out.flush();
   out.close();
}

However, when I run this code I get an exception:

java.io.IOException: JZ0I9: This InputStream was closed.
    at com.sybase.jdbc4.jdbc.ErrorMessage.raiseIOException(Unknown Source)  at com.sybase.jdbc4.jdbc.ErrorMessage.raiseIOException(Unknown Source)
    at com.sybase.jdbc4.jdbc.RawInputStream.checkMe(Unknown Source)
    at com.sybase.jdbc4.jdbc.RawInputStream.read(Unknown Source)
    at com.sybase.jdbc4.jdbc.RawInputStream.read(Unknown Source)
    at blobtester.BlobTester.getOracleBlob(BlobTester.java:86)
    at blobtester.BlobTester.main(BlobTester.java:34)

Again, this works for oracle. Is there anything I'm missing that is different about Sybase? Is the file being saved/retrieved correctly?

edit: It turns out the problem was inserting the file into Sybase. I changed the code to:

File image = new File(filePath); 
InputStream fis = new FileInputStream(image);
LobHandler lobHandler = new DefaultLobHandler();
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource); 
jdbcTemplate.update("INSERT INTO blob_test VALUES (?)", new Object[] {new SqlLobValue(fis, (int)image.length(), lobHandler)}, new int[] {Types.BLOB});

And it worked for both Sybase and oracle. Thanks.

Answer 1

Code from this link worked: http://forum.spring.io/forum/spring-projects/data/9931-sybase-and-blob-storing

[Just adding an answer, to close the question.]