/// <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.InitDbContext(name, autoClose);
result._autoClose = autoClose;
result._commandTimeout = DbConnectionManager.GetCommandTimeout(name);
return(result);
}
private async Task <Tuple <DbConnection, bool> > CreateConnectionAsync(string name)
{
bool isConnectionCreator = false;
// non-transactional operation
GraphWithoutTransaction connections = this.GraphWithoutTx;
DbConnection connection = GetConnection(name);
if ((connection != null) && (connection.State != ConnectionState.Open))
{
if (connection.ConnectionString.IsNullOrEmpty())
{
connection.ConnectionString = DbConnectionManager.GetConnectionString(name);
}
await OpenConnectionAsync(name, connection);
WriteTraceInfo(connection.DataSource + "." + connection.Database
+ "[" + SNTPClient.AdjustedTime.ToString("yyyyMMdd HH:mm:ss.fff") + "]", " Open Connection ");
}
return(new Tuple <DbConnection, bool>(connection, isConnectionCreator));
}