Java ResultSet.isFirst()

boolean isFirst()  throws SQLException

/*from  www. ja  v  a2  s  .com*/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Main {
  public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement st = conn
        .createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);

    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
    st.executeUpdate("insert into survey (id,name ) values (2,null)");
    st.executeUpdate("insert into survey (id,name ) values (3,'Tom')");
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    // Get cursor position
    int pos = rs.getRow();          // 0
    System.out.println(pos);
    boolean b = rs.isBeforeFirst(); // true
    System.out.println(b);

    // Move cursor to the first row
    rs.next();

    // Get cursor position
    pos = rs.getRow();              // 1
    b = rs.isFirst();               // true
    System.out.println(pos);
    System.out.println(b);
    
    
    // Move cursor to the last row
    rs.last();
    // Get cursor position
    pos = rs.getRow();   
    System.out.println(pos);
    b = rs.isLast();     // true

    // Move cursor past last row
    rs.afterLast();

    // Get cursor position
    pos = rs.getRow();       
    b = rs.isAfterLast();    // true

    rs.close();
    st.close();
    conn.close();
  }

  private static Connection getConnection() throws Exception {
    Class.forName("org.hsqldb.jdbcDriver");
    String url = "jdbc:hsqldb:mem:data/tutorial";

    return DriverManager.getConnection(url, "sa", "");
  }
}