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showing database image into canvas in java
blobCitizen=rsPersonalInfo.getBlob("citizen_image");

public byte[] convertBlobToByteArray(Blob itStrm)
{
    InputStream is;
    byte[] bytes=null;
    try {
        is = itStrm.getBinaryStream();
        bytes = new byte[(int)itStrm.length()];
            is.read(bytes);
            is.close();

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return bytes;
}