c# - 从 SQL Server 数据库获取信息

Question

请告诉我阅读器变量的数据类型应该是什么？

  public Patient GetPatientInfo(string ID)
  {
      const string sql_get_patient_info = "Select * from dbo.Tb_Patient WHERE id=@ID";
      Patient _p = new Patient();

      DbCommand readCommand = _db.GetSqlStringCommand(sql_get_patient_info);
      SqlDataReader reader = readCommand.ExecuteReader();

      while (reader.Read())
      {
           _p.PatientName = reader["Name"].ToString();
          _p.PatientDate = reader["Date"];
          _p.PatientGender = reader["Gender"].ToString();
          _p.PatientAge = reader["Age"].ToString();
          _p.PatientContact = reader["Contact"].ToString();
          _p.PatientOccupation = reader["Occupation"].ToString();
      }
      return _p;
  }

Answer 1

因为您使用的是 DbCommand 类，所以您调用

DbDataReader reader = readCommand.ExecuteDbDataReader();

MSDN ExecuteDbDataReader