/// <summary>
/// Executes this query asynchronously and collects all result sets
/// </summary>
private async Task ExecuteInternal()
{
ReliableSqlConnection sqlConn = null;
try
{
// Mark that we've internally executed
hasExecuteBeenCalled = true;
// Don't actually execute if there aren't any batches to execute
if (Batches.Length == 0)
{
if (BatchMessageSent != null)
{
await BatchMessageSent(new ResultMessage(SR.QueryServiceCompletedSuccessfully, false, null));
}
if (QueryCompleted != null)
{
await QueryCompleted(this);
}
return;
}
// Locate and setup the connection
DbConnection queryConnection = await ConnectionService.Instance.GetOrOpenConnection(editorConnection.OwnerUri, ConnectionType.Query);
sqlConn = queryConnection as ReliableSqlConnection;
if (sqlConn != null)
{
// Subscribe to database informational messages
sqlConn.GetUnderlyingConnection().FireInfoMessageEventOnUserErrors = true;
sqlConn.GetUnderlyingConnection().InfoMessage += OnInfoMessage;
}
// Execute beforeBatches synchronously, before the user defined batches
foreach (Batch b in BeforeBatches)
{
await b.Execute(queryConnection, cancellationSource.Token);
}
// We need these to execute synchronously, otherwise the user will be very unhappy
foreach (Batch b in Batches)
{
// Add completion callbacks
b.BatchStart += BatchStarted;
b.BatchCompletion += BatchCompleted;
b.BatchMessageSent += BatchMessageSent;
b.ResultSetCompletion += ResultSetCompleted;
await b.Execute(queryConnection, cancellationSource.Token);
}
// Execute afterBatches synchronously, after the user defined batches
foreach (Batch b in AfterBatches)
{
await b.Execute(queryConnection, cancellationSource.Token);
}
// Call the query execution callback
if (QueryCompleted != null)
{
await QueryCompleted(this);
}
}
catch (Exception e)
{
// Call the query failure callback
if (QueryFailed != null)
{
await QueryFailed(this, e);
}
}
finally
{
// Remove the message handler from the connection
if (sqlConn != null)
{
// Subscribe to database informational messages
sqlConn.GetUnderlyingConnection().InfoMessage -= OnInfoMessage;
}
// If any message notified us we had changed databases, then we must let the connection service know
if (newDatabaseName != null)
{
ConnectionService.Instance.ChangeConnectionDatabaseContext(editorConnection.OwnerUri, newDatabaseName);
}
foreach (Batch b in Batches)
{
if (b.HasError)
{
ConnectionService.EnsureConnectionIsOpen(sqlConn);
break;
}
}
}
}
private async Task ExecuteOnce(DbConnection conn, CancellationToken cancellationToken)
{
// Make sure we haven't cancelled yet
cancellationToken.ThrowIfCancellationRequested();
// Create a command that we'll use for executing the query
using (DbCommand dbCommand = CreateCommand(conn))
{
// Make sure that we cancel the command if the cancellation token is cancelled
cancellationToken.Register(() => dbCommand?.Cancel());
// Setup the command for executing the batch
dbCommand.CommandText = BatchText;
dbCommand.CommandType = CommandType.Text;
dbCommand.CommandTimeout = 0;
List <DbColumn[]> columnSchemas = null;
if (getFullColumnSchema)
{
// Executing the same query twice with different command behavior causes the second
// execution to return no rows if there's a trailing comment with no newline after,
// so add a newline to the end of the query. See https://github.com/Microsoft/sqlopsstudio/issues/1424
dbCommand.CommandText += Environment.NewLine;
ConnectionService.EnsureConnectionIsOpen(conn);
// Fetch schema info separately, since CommandBehavior.KeyInfo will include primary
// key columns in the result set, even if they weren't part of the select statement.
// Extra key columns get added to the end, so just correlate via Column Ordinal.
columnSchemas = new List <DbColumn[]>();
using (DbDataReader reader = await dbCommand.ExecuteReaderAsync(CommandBehavior.KeyInfo | CommandBehavior.SchemaOnly, cancellationToken))
{
if (reader != null && reader.CanGetColumnSchema())
{
do
{
columnSchemas.Add(reader.GetColumnSchema().ToArray());
} while (await reader.NextResultAsync(cancellationToken));
}
}
}
ConnectionService.EnsureConnectionIsOpen(conn);
// Execute the command to get back a reader
using (DbDataReader reader = await dbCommand.ExecuteReaderAsync(cancellationToken))
{
do
{
// Verify that the cancellation token hasn't been canceled
cancellationToken.ThrowIfCancellationRequested();
// Skip this result set if there aren't any rows (i.e. UPDATE/DELETE/etc queries)
if (!reader.HasRows && reader.FieldCount == 0)
{
continue;
}
// This resultset has results (i.e. SELECT/etc queries)
ResultSet resultSet = new ResultSet(resultSets.Count, Id, outputFileFactory);
resultSet.ResultCompletion += ResultSetCompletion;
// Add the result set to the results of the query
lock (resultSets)
{
resultSets.Add(resultSet);
}
// Read until we hit the end of the result set
await resultSet.ReadResultToEnd(reader, cancellationToken);
} while (await reader.NextResultAsync(cancellationToken));
// If there were no messages, for whatever reason (NO COUNT set, messages
// were emitted, records returned), output a "successful" message
if (!messagesSent)
{
await SendMessage(SR.QueryServiceCompletedSuccessfully, false);
}
}
if (columnSchemas != null)
{
ExtendResultMetadata(columnSchemas, resultSets);
}
}
}
