如何從一個dao函數返回一個整數？

Question

在我創建包含函數，這是我希望返回通過執行一個Oracle query.I產生的特定值的DAO類Servlet程序試圖像：

public int timeofdayafternoonthsmon(Getset g) throws ClassNotFoundException, SQLException { 
    // TODO Auto-generated method stub 
    Connection con=Dbconnection.getConnection(); 
    String userid=g.getuserid(); 
    PreparedStatement pstmt=con.prepareStatement("select count(timeofday) from mealdb where timeofday=? and userid=?"); 
    pstmt.setString(1,"Afternoon"); 
    pstmt.setString(2,userid); 
    int no=pstmt.executeUpdate(); 
    System.out.println(""+no); 
    return no; 
} 

但問題是它返回1作爲（我猜）成功。但我希望它返回執行此查詢的結果。

Answer 1

public int timeofdayafternoonthsmon(Getset g) throws ClassNotFoundException, SQLException { 
    // TODO Auto-generated method stub 
    Connection con=Dbconnection.getConnection(); 
    String userid=g.getuserid(); 
    PreparedStatement pstmt=con.prepareStatement("select count(timeofday) from mealdb where timeofday=? and userid=?"); 
    pstmt.setString(1,"Afternoon"); 
    pstmt.setString(2,userid); 

    // execute a query, not an update statement and fetch the result set 
    ResultSet rs = stmt.executeQuery(); 
    // position to the first result, there must be one since count(timeofday) returns at least 0 
    rs.next(); 

    System.out.println(""+rs.getInt(1)); 
    return rs.getInt(1); 
}