I want to create SQL query that returns some values and one of those values is blob.
When I just put blob column in my select it returns BigDecimal :|
its plain JDBC query with parameters
Add a comment
|
3 Answers
Take a look at the javadocs section on Materializing Blob Data.
You need to call getBlob on the blob column and then read the binary stream.
Blob blob = rs.getBlob("BLOB_COLUMN_NAME");
InputStream blobStream = blob.getBinaryStream();
//e.g. save blob to a file
FileOutputStream out = new FileOutputStream("file.txt");
byte[] buffer = new byte[1024];
int n = 0;
while( (n = blobStream.read(buffer)) != -1 ) {
out.write(buffer, 0, n);
}
out.flush();
out.close();
blobStream.close();
Comments
Inserting..
stmt = con.prepareStatement("INSERT INTO TABLE(fileName, "
+ "blobData) VALUES(?, ?)");
stmt.setString(1, "somefilename");
stmt.setObject(2, data);//data is byte[]
stmt.executeUpdate();
Selecting..
ResultSet rs;
stmt = con.prepareStatement("SELECT blobData "
+ "FROM BlobTest " + "WHERE fileName = ?");
stmt.setString(1, "somevalue");
rs = stmt.executeQuery();
if (!rs.next()) {
System.out.println("No such file stored.");
} else {
Blob b = rs.getBlob(1);
BufferedOutputStream os;
Try to call the method getBytes() from the ResultSet:
stmt = dbConn.prepareStatement("SELECT ...");
ResultSet rs = stmt.executeQuery();
byte[] blob = rs.getBytes(1);
This should return your blob object as a byte array.
