$sql = "select link from tabla";
$result = $conn->query($sql);

if ($result->num_rows > 0) {

    while($row = $result->fetch_assoc()) {
        echo "<img src='".$row["link"]."' >";
    }
}
$conn->close();

public static void main(String[] args) throws Exception, IOException, SQLException {
Class.forName("org.gjt.mm.mysql.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/databaseName", "usuario", "password");
String sqlQuery = "insert into tu_tabla(campo_foto) values ( ?)";

FileInputStream fis = null;
PreparedStatement ps = null;
try {
  conn.setAutoCommit(false);
  File archivo = new File("myPhoto.png");
  fis = new FileInputStream(archivo);
  ps = conn.prepareStatement(sqlQuery);
  ps.setBinaryStream(1, fis, (int) file.length());
  ps.executeUpdate();
  conn.commit();
} finally {
  ps.close();
  fis.close();
}