// 若是
public T TryGetValue <T>(string key, T defaultValue, bool writeBackFlag)
{
T result = defaultValue;
object value = this[key];
if (value != null)
{
try
{
object convertedObj = ConvertUtil.Convert(value, typeof(T));
if (convertedObj != null)
{
result = (T)convertedObj;
}
}
catch (Exception)
{
// do nothing here.
}
}
else
{
if (writeBackFlag)
{
this[key] = defaultValue;
}
}
return(result);
}
public virtual T Excute <T>()
{
T result = default(T);
try
{
dbCommand = owner.CreateCommand();
BuildCommand();
Type type = typeof(T);
if (commandBehavior == BeeDbCommandBehavior.NoQuery)
{
object obj = dbCommand.ExecuteScalar();
if (obj != null)
{
if (type == typeof(int) || type == typeof(long))
{
result = (T)ConvertUtil.Convert(obj, type);
}
else
{
throw new DataException("Not support the return type :" + type.Name);
}
}
}
else
{
if (type == typeof(DataTable))
{
result = (T)ExecuteDataTable();
}
else if (type == typeof(DataSet))
{
result = (T)ExecuteDataSet();
}
else
{
throw new DataException("Not support the return type :" + type.Name);
}
}
object retVal = FinishCommand();
if (retVal != null)
{
result = (T)ConvertUtil.Convert(retVal, type);
}
//Logger.Log(LogLevel.Core, this.ToSqlString());
}
catch (DbException dbException)
{
//if (dbCommand != null)
//{
// Logger.Debug(string.Format("DbCmdText:{0}\r\nconnection:{1}", dbCommand.CommandText, owner.DbDriver), dbException);
//}
throw new DataException(string.Format("{0}\r\n{1}", dbException.Message, this.ToString()), dbException);
}
catch (Exception ex)
{
//if (dbCommand != null)
//{
// Logger.Debug(string.Format("DbCmdText:{0}", dbCommand.CommandText), ex);
//}
throw new DataException(string.Format("{0}\r\n{1}", ex.Message, this.ToString()), ex);
}
finally
{
if (dbCommand != null)
{
dbCommand.Parameters.Clear();
dbCommand.Dispose();
}
// 若是默认session， 则关闭数据库连接
if (owner.IsDefaultSession)
{
owner.CloseConnection();
}
}
return(result);
}
public static IEnumerable <TResult> Cast <T, TResult>(this IEnumerable <T> self)
{
return(self.Select(item => ConvertUtil.Convert <T, TResult>(item)));
}