用java如何獲取對MS Server2005剛剛插入資料的ID值？

The Microsoft SQL Server 2005 JDBC Driver supports the optional JDBC 3.0 APIs to retrieve automatically generated row identifiers. The main value of this feature is to provide a way to make IDENTITY values available to an application that is updating a database table without a requiring a query and a second round-trip to the server.

Because SQL Server does not support pseudo columns for identifiers, updates that have to use the auto-generated key feature must operate against a table that contains an IDENTITY column. SQL Server allows only a single IDENTITY column per table. The result set that is returned by getGeneratedKeys method of the SQLServerStatement class will have only one column, with the returned column name of GENERATED_KEYS. If generated keys are requested on a table that has no IDENTITY column, the JDBC driver will return a null result set.

As an example, create the following table in the SQL Server 2005 AdventureWorks sample database:

CREATE TABLE TestTable 
   (Col1 int IDENTITY, 
    Col2 varchar(50), 
    Col3 int);
public static void executeInsertWithKeys(Connection con) {
   try {
      String SQL = "INSERT INTO TestTable (Col2, Col3) VALUES ('S', 50)";
      Statement stmt = con.createStatement();
      int count = stmt.executeUpdate(SQL, Statement.RETURN_GENERATED_KEYS);
      ResultSet rs = stmt.getGeneratedKeys();

      ResultSetMetaData rsmd = rs.getMetaData();
      int columnCount = rsmd.getColumnCount();
      if (rs.next()) {
         do {
            for (int i=1; i<=columnCount; i++) {
               String key = rs.getString(i);
               System.out.println("KEY " + i + " = " + key);
            }
         } while(rs.next());
      }
      else {
         System.out.println("NO KEYS WERE GENERATED.");
      }
      rs.close();
      stmt.close();
   }
   catch (Exception e) {
      e.printStackTrace();
   }
}