Question

我使用以下方法从dob中计算年龄和当前日期在java中，dob存储在数据库表中，使用getter setter方法导出dob值并将dob传递给getAge1方法，在方法查询中运行良好的php myadmin mysql控制台，当我在查询结果集中存储查询结果时，它在int age变量中给出null值。

public int getAge1(int id,String dob)
{


    try { 
        System.out.println("DOB is:"+dob);
        System.out.println("Id is:"+id);
         Connection conn = null;
         conn = DbConnection.getConnection();
         PreparedStatement ps = null;
         ResultSet rs = null;   

         String s3 = "SELECT TIMESTAMPDIFF(YEAR,"+ dob +",CURDATE()) from custregister where cid="+ id ;

         System.out.println("sql :"+s3);
            ps = conn.prepareStatement(s3);
            rs = ps.executeQuery();
            while (rs.next()) 
            {

                int s2 =rs.getInt(1);
                System.out.println("Age is "+s2);
                age=s2;
            }
    }catch(Exception e){e.printStackTrace();}   
    //SELECT TIMESTAMPDIFF(YEAR, 'dob', CURDATE()) AS age;
    return age;
}

Answer 1

试试这个：

     SELECT 
     TIMESTAMPDIFF(YEAR, dob, CURDATE())AS AGE 
     from custregister 
     where cid= your id ;

<强> http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_timestampdiff

<强>更新：1

String s3 = "SELECT TIMESTAMPDIFF(YEAR,"+ dob +",CURDATE()) from custregister  where cid='+id'" ;

Answer 2

在传递给SELECT语句的日期值周围添加单个引号。

在java中计算dob和当前日期的年龄

2 个答案: