/// <summary>
/// Initializes a new instance of <see cref="DbBatchOperation"/>.
/// </summary>
/// <param name="commandTemplate">The <see cref="DbCommand"/> template on which the <see cref="DbBatchOperation"/> is based.</param>
/// <param name="dialect">The <see cref="IDbDialect"/> associated with this <see cref="DbBatchOperation"/>.</param>
/// <param name="batchSize">The maximum number of items to be written in a batch.</param>
/// <param name="flushInterval">The frequency with which the current batch is to be flushed.</param>
public DbBatchOperation(IDbDialect dialect, IDbCommand commandTemplate, Int32 batchSize, TimeSpan flushInterval)
{
this.autoFlush = true;
this.dialect = dialect;
this.batchSize = batchSize;
this.flushInterval = flushInterval;
this.commandTemplate = commandTemplate.Clone();
this.waitHandle = new ManualResetEvent(initialState: false);
this.backgroundWorker = new Thread(WaitForData) { IsBackground = true };
this.buffer = CreateBuffer(commandTemplate);
this.backgroundWorker.Start();
}
/// <summary>
/// Initializes a new instance of <see cref="DbBatchOperation"/>.
/// </summary>
/// <param name="commandTemplate">The <see cref="DbCommand"/> template on which the <see cref="DbBatchOperation"/> is based.</param>
/// <param name="dialect">The <see cref="IDbDialect"/> associated with this <see cref="DbBatchOperation"/>.</param>
/// <param name="batchSize">The maximum number of items to be written in a batch.</param>
/// <param name="flushInterval">The frequency with which the current batch is to be flushed.</param>
public DbBatchOperation(IDbDialect dialect, IDbCommand commandTemplate, Int32 batchSize, TimeSpan flushInterval)
{
this.autoFlush = true;
this.dialect = dialect;
this.batchSize = batchSize;
this.flushInterval = flushInterval;
this.commandTemplate = commandTemplate.Clone();
this.waitHandle = new ManualResetEvent(initialState: false);
this.backgroundWorker = new Thread(WaitForData)
{
IsBackground = true
};
this.buffer = CreateBuffer(commandTemplate);
this.backgroundWorker.Start();
}
/// <summary>
/// Write out the current batch to the underlying data store.
/// </summary>
private void WriteBufferToDataStore()
{
using (var batch = CopyAndClearBuffer())
using (var command = commandTemplate.Clone())
using (var connection = dialect.OpenConnection())
using (var dataAdapter = dialect.Provider.CreateDataAdapter())
using (var transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted))
{
Debug.Assert(dataAdapter != null);
command.Connection = connection;
command.Transaction = transaction;
command.UpdatedRowSource = UpdateRowSource.None;
dataAdapter.InsertCommand = (DbCommand)command;
dataAdapter.ContinueUpdateOnError = true;
dataAdapter.UpdateBatchSize = batchSize;
dataAdapter.Update(batch);
transaction.Commit();
}
}
