WIP for query execution

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/AutoCompleteService.cs

@@ -54,12 +54,6 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
         /// </summary>
         public IEnumerable<string> AutoCompleteList { get; private set; }
 
-        public void InitializeService(ServiceHost serviceHost)
-        {
-            // Register a callback for when a connection is created
-            ConnectionService.Instance.RegisterOnConnectionTask(UpdateAutoCompleteCache);
-        }
-
         /// <summary>
         /// Update the cached autocomplete candidate list when the user connects to a database
         /// TODO: Update with refactoring/async
@@ -71,16 +65,17 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
             command.CommandText = "SELECT name FROM sys.tables";
             command.CommandTimeout = 15;
             command.CommandType = CommandType.Text;
-            var reader = await command.ExecuteReaderAsync();
+            using (var reader = await command.ExecuteReaderAsync())
-
-            List<string> results = new List<string>();
-            while (await reader.ReadAsync())
             {
-                results.Add(reader[0].ToString());
-            }
 
-            AutoCompleteList = results;
+                List<string> results = new List<string>();
-            await Task.FromResult(0);
+                while (await reader.ReadAsync())
+                {
+                    results.Add(reader[0].ToString());
+                }
+
+                AutoCompleteList = results;
+            }
         }
 
         /// <summary>

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/QueryDisposeRequest.cs

@@ -0,0 +1,37 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    /// <summary>
+    /// Parameters for the query dispose request
+    /// </summary>
+    public class QueryDisposeParams
+    {
+        public Guid QueryId { get; set; }
+    }
+
+    /// <summary>
+    /// Parameters to return as the result of a query dispose request
+    /// </summary>
+    public class QueryDisposeResult
+    {
+        /// <summary>
+        /// Any error messages that occurred during disposing the result set. Optional, can be set
+        /// to null if there were no errors.
+        /// </summary>
+        public string Messages { get; set; }
+    }
+
+    public class QueryDisposeRequest
+    {
+        public static readonly
+            RequestType<QueryDisposeParams, QueryDisposeResult> Type =
+            RequestType<QueryDisposeParams, QueryDisposeResult>.Create("query/dispose");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/QueryExecuteCompleteNotification.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    public class QueryExecuteCompleteNotification
+    {
+        /// <summary>
+        /// Any messages that came back from the server during execution of the query
+        /// </summary>
+        public string[] Messages { get; set; }
+
+        /// <summary>
+        /// Whether or not the query was successful. True indicates errors, false indicates success
+        /// </summary>
+        public bool Error { get; set; }
+
+        /// <summary>
+        /// Summaries of the result sets that were returned with the query
+        /// </summary>
+        public ResultSetSummary[] ResultSetSummaries { get; set; }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/QueryExecuteRequest.cs

@@ -0,0 +1,44 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    /// <summary>
+    /// Parameters for the query execute request
+    /// </summary>
+    public class QueryExecuteParams
+    {
+        /// <summary>
+        /// The text of the query to execute
+        /// </summary>
+        public string QueryText { get; set; }
+
+        /// <summary>
+        /// URI for the editor that is asking for the query execute
+        /// </summary>
+        public string OwnerUri { get; set; }
+    }
+
+    /// <summary>
+    /// Parameters for the query execute result
+    /// </summary>
+    public class QueryExecuteResult
+    {
+        /// <summary>
+        /// Connection error messages. Optional, can be set to null to indicate no errors
+        /// </summary>
+        public string Messages { get; set; }
+    }
+
+    public class QueryExecuteRequest
+    {
+        public static readonly
+            RequestType<QueryExecuteParams, QueryExecuteResult> Type =
+            RequestType<QueryExecuteParams, QueryExecuteResult>.Create("query/execute");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/QueryExecuteResultsRequest.cs

@@ -0,0 +1,54 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    /// <summary>
+    /// Parameters for a query result subset retrieval request
+    /// </summary>
+    public class QueryExecuteSubsetParams
+    {
+        /// <summary>
+        /// ID of the query to look up the results for
+        /// </summary>
+        public Guid QueryId { get; set; }
+
+        /// <summary>
+        /// Index of the result set to get the results from
+        /// </summary>
+        public int ResultSetIndex { get; set; }
+
+        /// <summary>
+        /// Beginning index of the rows to return from the selected resultset. This index will be
+        /// included in the results.
+        /// </summary>
+        public int RowsStartIndex { get; set; }
+
+        /// <summary>
+        /// Number of rows to include in the result of this request. If the number of the rows 
+        /// exceeds the number of rows available after the start index, all available rows after
+        /// the start index will be returned.
+        /// </summary>
+        public int RowsCount { get; set; }
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public class QueryExecuteSubsetResult
+    {
+        
+    }
+
+    public class QueryExecuteSubsetRequest
+    {
+        public static readonly
+            RequestType<QueryExecuteSubsetParams, QueryExecuteSubsetResult> Type =
+            RequestType<QueryExecuteSubsetParams, QueryExecuteSubsetResult>.Create("query/subset");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/ResultSet.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    public class ResultSet
+    {
+        public DbColumn[] Columns { get; set; }
+
+        public List<object[]> Rows { get; private set; }
+
+        public ResultSet()
+        {
+            Rows = new List<object[]>();
+        }
+
+        /// <summary>
+        /// Add a row of data to the result set using a <see cref="DbDataReader"/> that has already
+        /// read in a row.
+        /// </summary>
+        /// <param name="reader">A <see cref="DbDataReader"/> that has already had a read performed</param>
+        public void AddRow(DbDataReader reader)
+        {
+            List<object> row = new List<object>();
+            for (int i = 0; i < reader.FieldCount; ++i)
+            {
+                row.Add(reader.GetValue(i));
+            }
+            Rows.Add(row.ToArray());
+        }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/ResultSetSubset.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    public class ResultSetSubset
+    {
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/Contracts/ResultSetSummary.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts
+{
+    public class ResultSetSummary
+    {
+        /// <summary>
+        /// The ID of the result set within the query results
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// The number of rows that was returned with the resultset
+        /// </summary>
+        public long RowCount { get; set; }
+
+        /// <summary>
+        /// Details about the columns that are provided as solutions
+        /// </summary>
+        public DbColumn ColumnInfo { get; set; }
+    }
+}

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

@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices
+{
+    public class Query //: IDisposable
+    {
+        public string QueryText { get; set; }
+
+        public DbConnection SqlConnection { get; set; }
+
+        private readonly CancellationTokenSource cancellationSource;
+
+        public List<ResultSet> ResultSets { get; set; }
+
+        public Query(string queryText, DbConnection connection)
+        {
+            QueryText = queryText;
+            SqlConnection = connection;
+            ResultSets = new List<ResultSet>();
+            cancellationSource = new CancellationTokenSource();
+        }
+
+        public async Task Execute()
+        {
+            // Open the connection, if it's not already open
+            if ((SqlConnection.State & ConnectionState.Open) == 0)
+            {
+                await SqlConnection.OpenAsync(cancellationSource.Token);
+            }
+
+            // Create a command that we'll use for executing the query
+            using (DbCommand command = SqlConnection.CreateCommand())
+            {
+                command.CommandText = QueryText;
+                command.CommandType = CommandType.Text;
+
+                // Execute the command to get back a reader
+                using (DbDataReader reader = await command.ExecuteReaderAsync(cancellationSource.Token))
+                {
+                    do
+                    {
+                        // Create a new result set that we'll use to store all the data
+                        ResultSet resultSet = new ResultSet();
+                        if (reader.CanGetColumnSchema())
+                        {
+                            resultSet.Columns = reader.GetColumnSchema().ToArray();
+                        }
+
+                        // Read until we hit the end of the result set
+                        while (await reader.ReadAsync(cancellationSource.Token))
+                        {
+                            resultSet.AddRow(reader);
+                        }
+
+                        // Add the result set to the results of the query
+                        ResultSets.Add(resultSet);
+                    } while (await reader.NextResultAsync(cancellationSource.Token));
+                }
+            }
+        }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/QueryExecutionServices/QueryExecutionService.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Concurrent;
+using System.Threading.Tasks;
+using Microsoft.SqlTools.ServiceLayer.Hosting;
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol;
+using Microsoft.SqlTools.ServiceLayer.QueryExecutionServices.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecutionServices
+{
+    public sealed class QueryExecutionService
+    {
+        #region Singleton Instance Implementation
+
+        private static readonly Lazy<QueryExecutionService> instance = new Lazy<QueryExecutionService>(() => new QueryExecutionService());
+
+        public static QueryExecutionService Instance
+        {
+            get { return instance.Value; }
+        }
+
+        private QueryExecutionService() { }
+
+        #endregion
+
+        #region Properties
+
+        private readonly Lazy<ConcurrentDictionary<string, Query>> queries =
+            new Lazy<ConcurrentDictionary<string, Query>>(() => new ConcurrentDictionary<string, Query>());
+
+        private ConcurrentDictionary<string, Query> Queries
+        {
+            get { return queries.Value; }
+        }
+
+        #endregion
+
+        #region Public Methods
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="serviceHost"></param>
+        public void InitializeService(ServiceHost serviceHost)
+        {
+            // Register handlers for requests
+            serviceHost.SetRequestHandler(QueryExecuteRequest.Type, HandleExecuteRequest);
+            serviceHost.SetRequestHandler(QueryExecuteSubsetRequest.Type, HandleResultSubsetRequest);
+            serviceHost.SetRequestHandler(QueryDisposeRequest.Type, HandleDisposeRequest);
+
+            // Register handlers for events
+        }
+
+        #endregion
+
+        #region Request Handlers
+
+        private async Task HandleExecuteRequest(QueryExecuteParams executeParams,
+            RequestContext<QueryExecuteResult> requestContext)
+        {
+            
+        }
+
+        private async Task HandleResultSubsetRequest(QueryExecuteSubsetParams subsetParams,
+            RequestContext<QueryExecuteSubsetResult> requestContext)
+        {
+            await Task.FromResult(0);
+        }
+
+        private async Task HandleDisposeRequest(QueryDisposeParams disposeParams,
+            RequestContext<QueryDisposeResult> requestContext)
+        {
+            string messages = null;
+
+            Query result;
+            if (!Queries.TryRemove(disposeParams., out result))
+            {
+                messages = "Failed to dispose query, ID not found.";
+            }
+
+            await requestContext.SendResult(new QueryDisposeResult
+            {
+                Messages = messages
+            });
+        }
+
+        #endregion
+
+    }
+}