/// <summary>
/// 构造一个本地事务代码块
/// </summary>
/// <param name="dbSetting">数据库配置</param>
/// <param name="level">
/// 此级别只在最外层的代码块中有效。
/// </param>
public LocalTransactionBlock_1_0(DbSetting dbSetting, IsolationLevel level)
{
this._dbSetting = dbSetting;
this._level = level;
var tranRef = GetTransactionRef(this._dbSetting.Database, this);
tranRef.RefCount++;
this._currentRef = tranRef;
}
/// <summary>
/// 清除当前数据库在当前线程中正在使用的事务。
/// </summary>
private void ClearTransactionRef()
{
var name = LocalContextName(this._dbSetting.Database);
ServerContext.Items.Remove(name);
this._currentRef = null;
}
/// <summary>
/// 获取某个数据库在当前线程中正在被使用的事务引用。
/// </summary>
/// <param name="database"></param>
/// <param name="currentBlock">如果指定此对象，则在还没有创建事务时，使用此类的抽象方法创建一个新的事务对象。</param>
/// <returns></returns>
private static TransactionRef GetTransactionRef(string database, LocalTransactionBlock_1_0 currentBlock)
{
var name = LocalContextName(database);
var items = ServerContext.Items;
object value = null;
items.TryGetValue(name, out value);
var tranRef = value as TransactionRef;
if (tranRef == null && currentBlock != null)
{
var tran = currentBlock.BeginTransaction();
tranRef = new TransactionRef(tran);
items.Add(name, tranRef);
}
return tranRef;
}