如何获取当月生日的学生名单？

Question

我写了代码，但我可以得到所有的日期。如何获取当前月份的日期？

String connectionString = @"data source = localhost; initial catalog = StudentsBirthday; integrated security = SSPI;";
SqlConnection con = new SqlConnection(connectionString);
List<DateTime> birthdays = new List<DateTime>();

using (con)
{
    con.Open();
    SqlCommand cmd = new SqlCommand("Select Birthday From Students",con);
    SqlDataReader reader = cmd.ExecuteReader();
    while (reader.Read())
    {
        birthdays.Add(reader.GetDateTime(0));
    }
}

foreach (DateTime Birthday in birthdays)
{
    Console.WriteLine(Birthday);
}

Console.ReadKey();

Answer 1

您可以使用以下 SQL 查询：

SELECT Birthday FROM Students 
WHERE MONTH(Birthday) = MONTH(GETDATE())  
ORDER BY Birthday

这会比较来自GETDATE() 函数的生日月份和当前月份。这将按（升序）日期对生日进行排序。

您可以像这样将其添加到您的代码中：

var sqlQuery = "SELECT Birthday FROM Students WHERE MONTH(Birthday) = MONTH(GETDATE()) ORDER BY Birthday"
SqlCommand cmd = new SqlCommand(sqlQuery,con);