protected override DbCommand GetCommand(QueryCommand query, object[] paramValues)
{
SQLiteCommand cmd;
if (!this.provider.commandCache.TryGetValue(query, out cmd))
{
cmd = (SQLiteCommand)this.provider.Connection.CreateCommand();
cmd.CommandText = query.CommandText;
this.SetParameterValues(query, cmd, paramValues);
cmd.Prepare();
this.provider.commandCache.Add(query, cmd);
if (this.provider.Transaction != null)
{
cmd = (SQLiteCommand)cmd.Clone();
cmd.Transaction = (SQLiteTransaction)this.provider.Transaction;
}
}
else
{
cmd = (SQLiteCommand)cmd.Clone();
cmd.Transaction = (SQLiteTransaction)this.provider.Transaction;
this.SetParameterValues(query, cmd, paramValues);
}
return cmd;
}
private IEnumerable<int> ExecuteBatch(QueryCommand query, IEnumerable<object[]> paramSets, int batchSize)
{
SqlCommand cmd = (SqlCommand)this.GetCommand(query, null);
DataTable dataTable = new DataTable();
for (int i = 0, n = query.Parameters.Count; i < n; i++)
{
var qp = query.Parameters[i];
cmd.Parameters[i].SourceColumn = qp.Name;
dataTable.Columns.Add(qp.Name, TypeHelper.GetNonNullableType(qp.Type));
}
SqlDataAdapter dataAdapter = new SqlDataAdapter();
dataAdapter.InsertCommand = cmd;
dataAdapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
dataAdapter.UpdateBatchSize = batchSize;
this.LogMessage("-- Start SQL Batching --");
this.LogMessage("");
this.LogCommand(query, null);
IEnumerator<object[]> en = paramSets.GetEnumerator();
using (en)
{
bool hasNext = true;
while (hasNext)
{
int count = 0;
for (; count < dataAdapter.UpdateBatchSize && (hasNext = en.MoveNext()); count++)
{
var paramValues = en.Current;
dataTable.Rows.Add(paramValues);
this.LogParameters(query, paramValues);
this.LogMessage(string.Empty);
}
if (count > 0)
{
int n = dataAdapter.Update(dataTable);
for (int i = 0; i < count; i++)
{
yield return (i < n) ? 1 : 0;
}
dataTable.Rows.Clear();
}
}
}
this.LogMessage(string.Format("-- End SQL Batching --"));
this.LogMessage(string.Empty);
}
/// <summary>
/// 执行对 <typeparamref name="T"/> 类型的批量操作。
/// </summary>
/// <param name="query">查询.</param>
/// <param name="paramSets">查询参数集</param>
/// <param name="batchSize">批量语句大小.</param>
/// <param name="stream">是否使用流,if set to <c>true</c> [stream].</param>
/// <returns></returns>
public override IEnumerable<int> ExecuteBatch(QueryCommand query, IEnumerable<object[]> paramSets, int batchSize, bool stream)
{
this.StartUsingConnection();
try
{
var result = this.ExecuteBatch(query, paramSets, batchSize);
if (!stream || this.ActionOpenedConnection)
{
return result.ToList();
}
else
{
return new EnumerateOnce<int>(result);
}
}
finally
{
this.StopUsingConnection();
}
}
