You define an identity column in a CREATE TABLE by specifying the IDENTITY clause when you define a column.
This feature is defined in the JDBC, and implmented in the MS Sql Server 2005, not in the older version. For Oracle database this is not implemented, but the common solution of the rownum can be used instead.

1.Set the prepared statement to get the identity column from DB:

Connection.prepareStatement(sql-statement,
Statement.RETURN_GENERATED_KEYS);

or

Statement.executeUpdate(sql-statement, Statement.RETURN_GENERATED_KEYS);

2. Get the generated values from the statement

rs = stmt.getGeneratedKeys();
while (rs.next()) {
rs.getBigDecimal(1);
}

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