/// <summary>
/// Loads a data object using a primary key
/// </summary>
/// <param name="ID">Primary key value to load.</param>
public void Load(int ID)
{
// Load a dataobject by it's Primary[0] ID
if (PrimaryKeys.Count == 0)
{
DataObjectException ValidationError = new DataObjectException("Only one key was given for a multiple key object.");
throw ValidationError;
}
if (TableName.Trim().Length == 0)
{
DataObjectException ValidationError = new DataObjectException("The object's table has not been set.");
throw ValidationError;
}
try
{
DataCommand.Connection = ConnHandler.RequestConnection(Alias, this);
DataCommand.CommandText = "SELECT * FROM " +
TableName + " WHERE " + PrimaryKeys[0].Name +
" = " + ID.ToString();
DataAdapter.SelectCommand = _dbcmdData;
int x = (int)DataAdapter.Fill(_dataTable);
if (x == 0)
{
// Record doesn't exist
_dataRow = null;
DataObjectException.InvalidRecordException PrimaryKeyError =
new DataObjectException.InvalidRecordException();
throw PrimaryKeyError;
}
else
{
_dataRow = _dataTable.Rows[_dataTable.Rows.Count - 1];
if (RecordChanged != null)
{
RecordChangedEventArgs args = new RecordChangedEventArgs(RowAction.Loaded);
RecordChanged(this, args);
}
}
}
catch (Exception err)
{
throw err;
}
finally
{
ConnHandler.ReleaseConnection(this, DataCommand.Connection);
}
}
/// <summary>
/// Delete the object with this ID from the database.
/// </summary>
public void Delete(int ID)
{
if (PrimaryKeys.Count > 1)
{
DataObjectException ValidationError = new DataObjectException("Only one key was given for a multiple key object.");
throw ValidationError;
}
if (_dataRow != null)
{
if (_dataRow[PrimaryKeys[0].Name] is int)
{
if ((int)_dataRow[PrimaryKeys[0].Name] == ID)
{
Delete();
return;
}
}
}
try
{
string Sql;
Sql = "DELETE FROM " + TableName + " WHERE " + PrimaryKeys[0].Name + " = " + ID.ToString();
DataCommand.Connection = ConnHandler.RequestConnection(Alias, this);
_dbcmdData.CommandText = Sql;
int x = (int)_dbcmdData.ExecuteNonQuery();
if (x == 0)
{
// Record doesn't exist
_dataRow = null;
DataObjectException.InvalidRecordException PrimaryKeyError =
new DataObjectException.InvalidRecordException();
throw PrimaryKeyError;
}
}
catch (Exception err)
{
throw err;
}
finally
{
ConnHandler.ReleaseConnection(this, DataCommand.Connection);
}
}
/// <summary>
/// Loads a data object using multiple primary keys
/// </summary>
/// <param name="IDs">Primary key array to load.</param>
public void Load(int[] IDs)
{
// Load a dataobject by all of it's IDs
if (PrimaryKeys.Count != IDs.Length)
{
DataObjectException ValidationError = new DataObjectException("The object's primary keys do match the load values given.");
throw ValidationError;
}
if (TableName.Trim().Length == 0)
{
DataObjectException ValidationError = new DataObjectException("The object's table has not been set.");
throw ValidationError;
}
try
{
DataCommand.Connection = ConnHandler.RequestConnection(Alias, this);
DataCommand.CommandText = "SELECT * FROM " +
TableName + " WHERE";
for (int i = 0; i < PrimaryKeys.Count; i++)
{
if (i > 0)
{
DataCommand.CommandText += " AND";
}
DataCommand.CommandText += " " + PrimaryKeys[i].Name + " = " + IDs[i].ToString();
}
DataAdapter.SelectCommand = _dbcmdData;
int x = (int)DataAdapter.Fill(_dataTable);
if (x == 0)
{
// Record doesn't exist
_dataRow = null;
DataObjectException.InvalidRecordException PrimaryKeyError =
new DataObjectException.InvalidRecordException();
throw PrimaryKeyError;
}
else
{
_dataRow = _dataTable.Rows[_dataTable.Rows.Count - 1];
if (RecordChanged != null)
{
RecordChangedEventArgs args = new RecordChangedEventArgs(RowAction.Loaded);
RecordChanged(this, args);
}
}
}
catch (Exception err)
{
throw err;
}
finally
{
ConnHandler.ReleaseConnection(this, DataCommand.Connection);
}
}
/// <summary>
/// Delete the object with these IDs from the database.
/// </summary>
public void Delete(int[] IDs)
{
if (PrimaryKeys.Count != IDs.Length)
{
DataObjectException ValidationError = new DataObjectException("The object's primary keys do match the ID values given.");
throw ValidationError;
}
if (_dataRow != null)
{
for (int i = 0; i < PrimaryKeys.Count; i++)
{
if (_dataRow[PrimaryKeys[i].Name] is int)
{
if ((int)_dataRow[PrimaryKeys[i].Name] != IDs[i])
{
break;
}
else if (i == PrimaryKeys.Count - 1)
{
// The object trying to be deleted is this object
Delete(); // Delete self
return;
}
}
else
{
break;
}
}
}
try
{
string Sql;
Sql = "DELETE FROM " + TableName + " WHERE";
for (int i = 0; i < PrimaryKeys.Count; i++)
{
if (i > 0)
{
Sql += " AND";
}
Sql += " " + PrimaryKeys[i].Name + " = " + IDs[i].ToString();
}
DataCommand.Connection = ConnHandler.RequestConnection(Alias, this);
_dbcmdData.CommandText = Sql;
int x = (int)_dbcmdData.ExecuteNonQuery();
if (x == 0)
{
// Record doesn't exist
_dataRow = null;
DataObjectException.InvalidRecordException PrimaryKeyError =
new DataObjectException.InvalidRecordException();
throw PrimaryKeyError;
}
}
catch (Exception err)
{
throw err;
}
finally
{
ConnHandler.ReleaseConnection(this, DataCommand.Connection);
}
}
