|
/*
Copyright (c) 2006, Marc Clifton
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution.
* Neither the name Marc Clifton nor the names of contributors may be
used to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Data;
using Clifton.Collections.Generic;
namespace Clifton.Data
{
public class DataTablePKTransactionRecord : DataTableTransactionRecord
{
protected Dictionary<string, object> pkValues;
public Dictionary<string, object> PrimaryKeyValues
{
get { return pkValues; }
}
public DataTablePKTransactionRecord()
: base()
{
pkValues = new Dictionary<string, object>();
}
public DataTablePKTransactionRecord(TransactionRecordPacket trp) : base()
{
transType = trp.TransactionType;
newValue = trp.NewValue;
columnName = trp.ColumnName;
pkValues = trp.PrimaryKeyValues;
}
public override DataRow Revert(DataTable sourceTable)
{
throw new DataTableTransactionException("Not Implemented. Cannot apply revert on a PKRecord.");
}
public override DataRow Apply(DataView dataView)
{
DataTable sourceTable = dataView.Table;
// If the transaction record contains a known DataRow, then use
// the default Apply method.
if (row != null)
{
base.Apply(dataView);
}
else
{
// We have to use the PK value information to determine the row.
switch (transType)
{
case RecordType.NewRow:
row = sourceTable.NewRow();
SetPKFieldValues();
sourceTable.Rows.Add(row);
break;
case RecordType.DeleteRow:
row = FindRow(dataView);
row.Delete();
break;
case RecordType.ChangeField:
row = FindRow(dataView);
row[columnName] = newValue;
break;
}
}
return null;
}
protected void SetPKFieldValues()
{
foreach (KeyValuePair<string, object> kvp in pkValues)
{
row[kvp.Key] = kvp.Value;
}
}
protected DataRow FindRow(DataView dataView)
{
if ((dataView.Sort == null) || (dataView.Sort == String.Empty))
{
throw new DataTableSynchronizationManagerException("The transaction logger's SetupSort method must be called before synchronization.");
}
object[] pks = new object[pkValues.Count];
pkValues.Values.CopyTo(pks, 0);
int idx = dataView.Find(pks);
if (idx < 0)
{
throw new DataTableSynchronizationManagerException("Could not find row to update.");
}
return dataView[idx].Row;
}
}
}
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.