Unable to create updatable statement for MySQL?

Question

The following code fragment prints 'Read only', even though the updatable flag is being set for the createStatement function. Can anyone give me an idea of what I am doing wrong here? I'm able to read stuff OK, but not update anything.
Connection conn = DriverManager.getConnection("jdbc:mysql:[removed]");
Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String query = "select * from foo";
rs = stmt.executeQuery(query);
int concurrency = rs.getConcurrency();
if (concurrency == ResultSet.CONCUR_READ_ONLY)
     System.out.println("Read only");
else
     if (concurrency == ResultSet.CONCUR_UPDATABLE)
          System.out.println("Updatable");
     else
          System.out.println("Unknown concurrency - " + concurrency);

Answer 1

Not all databases support all the listed resultSetType and resultSetConcurrency values; usually, if you try to use an unsopported type, you still get a connection but it's type os downgraded.
You can usually find out if a type is supported by reading the documentation, or querying the database, using DataBaseMetaData.supportsResultSetConcurrency()
Sadly, the only thing in the MySQL documentation that I'm aware of on this topic is a note in the changelog for the 3.0.2-dev version of MySQL
    - Fixed DBMD.supportsResultSetConcurrency() so that it returns true
      for ResultSet.TYPE_SCROLL_INSENSITIVE and ResultSet.CONCUR_READ_ONLY or
      ResultSet.CONCUR_UPDATABLEI did a quick search and might have missed something:
http://dev.mysql.com/doc/mysql/en/index.html
I suspect TYPE_SCROLL_SENSITIVE is not supported and your connection is being downgraded; you might try testing the DBMD to see what the database says is supported...