/// <summary>
/// 从分布式事务环境中获取数据库链接对象。
/// </summary>
/// <param name="database">数据库对象。</param>
/// <returns>如果未启用分布式事务，则为 null，否则为对应 <see cref="IDatabase"/> 的数据库链接对象。</returns>
public static DbConnection GetConnection(IDatabase database)
{
var curTrans = Transaction.Current;
if (curTrans == null)
{
return(null);
}
if (!_transConns.TryGetValue(curTrans, out SafetyDictionary <string, DbConnection> connDictionary))
{
connDictionary = new SafetyDictionary <string, DbConnection>();
_transConns.TryAdd(curTrans, connDictionary);
Tracer.Debug($"Transaction registered.");
curTrans.TransactionCompleted += OnTransactionCompleted;
}
var connStr = database.ConnectionString.ToString();
if (!connDictionary.TryGetValue(connStr, out DbConnection connection))
{
connection = database.Provider.DbProviderFactory.CreateConnection();
if (connection != null)
{
connection.ConnectionString = connStr;
connection.TryOpen();
connection.EnlistTransaction(curTrans);
connDictionary.TryAdd(connStr, connection);
Tracer.Debug($"DbConnection of '{connStr}' registered.");
}
}
else
{
Tracer.Debug($"DbConnection get from cache.");
}
return(connection);
}