import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class TestResultSet {
  public static List query(){
    Connection conn = new ConnectionUtil().openConnection();
    try {
      Statement stmt = conn.createStatement();
      String sql = "select id,name,email from customertbl";
      ResultSet rs = stmt.executeQuery(sql);
      //将结果集封装到List中
      List list = new ArrayList();
      while(rs.next()){
        // 可以根据列名称也可以根据列索引
        int id = rs.getInt(1);
        String name = rs.getString("name");
        String email = rs.getString("email");
        System.out.println(id+":"+name+":"+email);
        Customer c = new Customer();
        c.setId(id);
        c.setName(name);
        c.setEmail(email);
        //将对象存放到list容器中
        list.add(c);
      }
      return list;
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      try {
        conn.close();
      } catch (SQLException e) {
        conn = null;
        e.printStackTrace();
      }
    }
    return null;
  }
}