public override IList <T> Select(string tran, IList <OrderBy> orders, Limit limit, out string message, params Restrain[] restrain)
{
DboProjectionAttribute tnAttr = typeof(T).GetCustomAttribute <DboProjectionAttribute>();
if (tnAttr == null || String.IsNullOrWhiteSpace(tnAttr.Projection))
{
throw new Exception(String.Format("对象{0}没有设置表映射关系", typeof(T).Name));
}
IList <T> result = new List <T>();
StringBuilder restainStr = new StringBuilder();
SqlCommand sqlCmd = new SqlCommand();
foreach (Restrain rst in restrain)
{
if (rst == null)
{
continue;
}
restainStr.Append(rst.SqlStr);
foreach (KeyValuePair <string, object> kv in rst.Params)
{
SqlParameter param = new SqlParameter
{
ParameterName = kv.Key.Replace("__PARAMCODE__", "@"),
Value = kv.Value
};
sqlCmd.Parameters.Add(param);
}
}
StringBuilder ordBy = new StringBuilder();
PropertyInfo[] pis = typeof(T).GetProperties();
IEnumerable <string> piNames = from pi in pis select pi.Name;
ordBy.Append(" ORDER BY ");
if (orders != null)
{
foreach (OrderBy order in orders)
{
if (String.IsNullOrWhiteSpace(order.Field))
{
throw new ArgumentNullException();
}
if (piNames.Contains(order.Field))
{
ordBy.AppendFormat(" {0}", order.Field);
}
if (!order.Asc)
{
ordBy.Append(" DESC");
}
else
{
ordBy.Append(" ASC");
}
ordBy.Append(" ,");
}
}
if (ordBy[ordBy.Length - 1] == ',')
{
ordBy.Remove(ordBy.Length - 1, 1);
}
SqlTransaction sqlTran = null;
bool runInTran = !String.IsNullOrWhiteSpace(tran);
if (runInTran)
{
sqlTran = (SqlTransaction)SqlProvider.GetTransaction(tran);
}
else
{
tran = SqlProvider.CreateTransaction <T>();
sqlTran = (SqlTransaction)SqlProvider.GetTransaction(tran);
}
if (sqlTran == null && runInTran)
{
message = String.Format("Trans={0}不存在", tran);
return(new List <T>());
}
if (limit == null)
{
limit = new Limit();
}
string sql = "WITH _T_ AS ((SELECT TOP {1} ROW_NUMBER() OVER({2}) AS _AUTOID_, * FROM {3} WHERE 1 = 1 {5}))SELECT TOP {0} * FROM _T_ {6} WHERE _AUTOID_ > {4}";
sqlCmd.CommandText = String.Format(sql, limit.Size, limit.Size + limit.Pos, ordBy.ToString(),
tnAttr.Projection, limit.Pos, restainStr, runInTran?"":"WITH(NOLOCK)")
.Replace("__PARAMCODE__", "@");
sqlCmd.Transaction = sqlTran;
sqlCmd.Connection = sqlTran.Connection;
Debug(sqlCmd);
try
{
SqlDataReader reader = sqlCmd.ExecuteReader();
while (reader.Read())
{
T item = new T();
PropertyInfo[] pList = typeof(T).GetProperties();
foreach (PropertyInfo pi in pList)
{
if (pi.GetCustomAttribute <NotColumnAttribute>() != null)
{
continue;
}
object val = reader[pi.Name];
if (val.GetType() != typeof(DBNull))
{
pi.SetValue(item, val);
}
}
result.Add(item);
}
reader.Close();
if (!runInTran)
{
SqlProvider.CloseTransaction(tran, true);
}
message = String.Format("列出对象{0}笔", result.Count);
}
catch (Exception ex)
{
message = ex.Message;
SqlProvider.CloseTransaction(tran, false);
}
return(result);
}
/// <summary> /// 从数据库中取得制定条件的对象 /// </summary> /// <param name="tran">事务号</param> /// <param name="order">排序信息</param> /// <param name="limit">分页信息</param> /// <param name="message">提示信息</param> /// <param name="restrain">条件</param> /// <returns>对象列表</returns> public abstract IList <T> Select(string tran, IList <OrderBy> order, Limit limit, out string message, params Restrain[] restrain);
