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我有ado.net操作的基类,看起来像这样:如何将数据读取器中的数据读入数据表?
public abstract class BaseDataAccess
{
private string _connectionString = ......
protected string ConnectionString
{
get { return _connectionString; }
}
protected object ExecuteScalar(string spName, SqlParameter[] parameters=null)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
using (SqlCommand command = new SqlCommand(spName, connection))
{
if (parameters != null)
{
command.Parameters.AddRange(parameters);
}
command.CommandType = System.Data.CommandType.StoredProcedure;
connection.Open();
return command.ExecuteScalar();
}
}
}
protected DataTable ExecuteReader(string spName, SqlParameter[] parameters=null)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
using (SqlCommand command = new SqlCommand(spName, connection))
{
if (parameters != null)
{
command.Parameters.AddRange(parameters);
}
command.CommandType = CommandType.StoredProcedure;
connection.Open();
using (SqlDataReader reader = command.ExecuteReader())
{
DataTable table = new DataTable();
table.Load(reader);
return table;
}
}
}
}
}
而且,查询用户表类
public class UsersAccess : BaseDataAccess
{
private const string SP_COUNT_USERS = "spCountUsers";
private const string SP_GET_USERS = "spGetUsers";
public int CountUsers()
{
return (int)base.ExecuteScalar(SP_COUNT_USERS);
}
public IList<User> GetUsers()
{
DataTable usersTable = base.ExecuteReader(SP_GET_USERS);
return GetUsersFromDataTable(usersTable);
}
private IList<User> GetUsersFromDataTable(DataTable usersTable)
{
IList<User> users = new List<User>();
foreach (DataRow row in usersTable.Rows)
{
User user = new User();
user.UserID = (int)row["UserID"];
user.Password = (string)row["Password"];
user.Username = (string)row["Username"];
}
return users;
}
}
数据读取器配有2行数据,但当没有数据进入数据表时。 如何做到这一点?
PS:对于更好的ado.net基类,任何提示都会很棒。我只有几张桌子,只有很少的程序/桌子。
你可以尝试DataAdapter.Fill方法方法结束,虽然我没有看到一个很好的理由,为什么你当前的代码不起作用。 (http://msdn.microsoft.com/en-us/library/497b1k4t.aspx) – 2012-08-09 20:52:23