/// <summary> /// 获取一个DbContext对象 /// </summary> /// <param name="name">连接名称</param> /// <param name="autoClose">是否自动关闭</param> /// <returns>DbContext对象</returns> public static DbContext GetContext(string name, bool autoClose) { //得到映射后连接名称 name = DbConnectionMappingContext.GetMappedConnectionName(name); DbProviderFactory factory = DbConnectionManager.GetDbProviderFactory(name); DbConnectionStringBuilder csb = factory.CreateConnectionStringBuilder(); csb.ConnectionString = DbConnectionManager.GetConnectionString(name); bool enlist = true; if (csb.ContainsKey("enlist")) { enlist = (bool)csb["enlist"]; } DbContext result = null; if (enlist) { result = new AutoEnlistDbContext(name, autoClose); } else { result = new NotEnlistDbContext(name, autoClose); } result.autoClose = autoClose; return(result); }
/// <summary> /// 创建一个连接 /// <remarks> /// the connection retrieve process is as the following procedure: /// <list type="bullet"> /// <item>if no transaction exists, this method create and return a new DbConnection instance</item> /// <item>if transaction exists, this method should return a cached DbConnection instance</item> /// </list> /// <param name="isConnectionCreator">输出参数,返回连接是否创建成功</param> /// <param name="name">数据库连接名称</param> /// </remarks> /// </summary> private DbConnection CreateConnection(string name, out bool isConnectionCreator) { DbConnection connection; isConnectionCreator = false; // non-transactional operation GraphWithoutTransaction connections = GraphWithoutTx; if (Transaction.Current == null) { connection = GetConnectionWithoutTx(name); } else { connection = OnGetConnectionWithTransaction(Transaction.Current); } if ((connection != null) && (connection.State != ConnectionState.Open)) { if (string.IsNullOrEmpty(connection.ConnectionString)) { connection.ConnectionString = DbConnectionManager.GetConnectionString(name); } connection.Open(); WriteTraceInfo(connection.DataSource + "." + connection.Database + "[" + DateTime.Now.ToString("yyyyMMdd HH:mm:ss.fff") + "]", " Open Connection "); } return(connection); }