Do not use ReliableCommand in the query execution service (#66)

* Do not use ReliableCommand in the query execution service.

* Fixing the logic to remove InfoMessage handlers from ReliableSqlConnection

* Adding test to query UDT

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Batch.cs

@@ -6,6 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.Data;
 using System.Data.Common;
+using System.Diagnostics;
 using System.Data.SqlClient;
 using System.Linq;
 using System.Threading;
@@ -134,16 +135,26 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
 
             try
             {
+                DbCommand command = null;
+
                 // Register the message listener to *this instance* of the batch
                 // Note: This is being done to associate messages with batches
                 ReliableSqlConnection sqlConn = conn as ReliableSqlConnection;
                 if (sqlConn != null)
                 {
                     sqlConn.GetUnderlyingConnection().InfoMessage += StoreDbMessage;
+                    command = sqlConn.GetUnderlyingConnection().CreateCommand();
+                }
+                else
+                {
+                    command = conn.CreateCommand();
                 }
 
+                // Make sure we aren't using a ReliableCommad since we do not want automatic retry
+                Debug.Assert(!(command is ReliableSqlConnection.ReliableSqlCommand), "ReliableSqlCommand command should not be used to execute queries");
+
                 // Create a command that we'll use for executing the query
-                using (DbCommand command = conn.CreateCommand())
+                using (command)
                 {
                     command.CommandText = BatchText;
                     command.CommandType = CommandType.Text;
@@ -190,10 +201,10 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
             finally
             {
                 // Remove the message event handler from the connection
-                SqlConnection sqlConn = conn as SqlConnection;
+                ReliableSqlConnection sqlConn = conn as ReliableSqlConnection;
                 if (sqlConn != null)
                 {
-                    sqlConn.InfoMessage -= StoreDbMessage;
+                    sqlConn.GetUnderlyingConnection().InfoMessage -= StoreDbMessage;
                 }
 
                 // Mark that we have executed

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Query.cs

@@ -195,10 +195,21 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
                     sqlConn.GetUnderlyingConnection().InfoMessage += OnInfoMessage;
                 }
 
-                // We need these to execute synchronously, otherwise the user will be very unhappy
-                foreach (Batch b in Batches)
+                try
                 {
-                    await b.Execute(conn, cancellationSource.Token);
+                    // We need these to execute synchronously, otherwise the user will be very unhappy
+                    foreach (Batch b in Batches)
+                    {
+                        await b.Execute(conn, cancellationSource.Token);
+                    }
+                }
+                finally
+                {
+                    if (sqlConn != null)
+                    {
+                        // Subscribe to database informational messages
+                        sqlConn.GetUnderlyingConnection().InfoMessage -= OnInfoMessage;
+                    }
                 }
 
                 // TODO: Close connection after eliminating using statement for above TODO

test/Microsoft.SqlTools.ServiceLayer.Test/QueryExecution/Common.cs

@@ -39,6 +39,8 @@ namespace Microsoft.SqlTools.ServiceLayer.Test.QueryExecution
 
         public const string NoOpQuery = "-- No ops here, just us chickens.";
 
+        public const string UdtQuery = "SELECT hierarchyid::Parse('/')";
+
         public const string OwnerUri = "testFile";
 
         public const int StandardRows = 5;

test/Microsoft.SqlTools.ServiceLayer.Test/QueryExecution/ExecuteTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+//#define USE_LIVE_CONNECTION
+
 using System;
 using System.Data.Common;
 using System.Linq;
@@ -17,6 +19,7 @@ using Microsoft.SqlTools.ServiceLayer.SqlContext;
 using Microsoft.SqlTools.ServiceLayer.Test.Utility;
 using Microsoft.SqlTools.ServiceLayer.Workspace;
 using Microsoft.SqlTools.ServiceLayer.Workspace.Contracts;
+using Microsoft.SqlTools.Test.Utility;
 using Moq;
 using Xunit;
 
@@ -667,7 +670,35 @@ namespace Microsoft.SqlTools.ServiceLayer.Test.QueryExecution
             Assert.NotEmpty(complete.BatchSummaries[0].Messages);
         }
 
-        #endregion
+#if USE_LIVE_CONNECTION
+        [Fact]
+        public void QueryUdtShouldNotRetry()
+        {
+            // If:
+            // ... I create a query with a udt column in the result set
+            ConnectionInfo connectionInfo = TestObjects.GetTestConnectionInfo();
+            Query query = new Query(Common.UdtQuery, connectionInfo, new QueryExecutionSettings(), Common.GetFileStreamFactory());
+
+            // If:
+            // ... I then execute the query
+            DateTime startTime = DateTime.Now;
+            query.Execute().Wait();
+
+            // Then:
+            // ... The query should complete within 2 seconds since retry logic should not kick in
+            Assert.True(DateTime.Now.Subtract(startTime) < TimeSpan.FromSeconds(2), "Query completed slower than expected, did retry logic execute?");
+
+            // Then:
+            // ... There should be an error on the batch
+            Assert.True(query.HasExecuted);
+            Assert.NotEmpty(query.BatchSummaries);
+            Assert.Equal(1, query.BatchSummaries.Length);
+            Assert.True(query.BatchSummaries[0].HasError);
+            Assert.NotEmpty(query.BatchSummaries[0].Messages);
+        }
+#endif
+
+#endregion
 
         private void VerifyQueryExecuteCallCount(Mock<RequestContext<QueryExecuteResult>> mock, Times sendResultCalls, Times sendEventCalls, Times sendErrorCalls)
         {

test/Microsoft.SqlTools.ServiceLayer.Test/Utility/TestObjects.cs

@@ -35,6 +35,17 @@ namespace Microsoft.SqlTools.Test.Utility
 #endif
         }
 
+        /// <summary>
+        /// Creates a test connection info instance.
+        /// </summary>
+        public static ConnectionInfo GetTestConnectionInfo()
+        {
+            return new ConnectionInfo(
+                GetTestSqlConnectionFactory(),
+                "file://some/file.sql",
+                GetTestConnectionDetails());
+        }
+
         public static ConnectParams GetTestConnectionParams()
         {
             return new ConnectParams()