Pr 84

Snowflake.Data.Tests/App.config

@@ -26,6 +26,15 @@ Copyright (c) 2012-2017 Snowflake Computing Inc. All rights reserved.
       <appender-ref ref="MyRollingFileAppender" />
     </root>
   </log4net>
+
+  <!-- used in SFDbFactoryIT.cs to test registering DbProviderFactoryClass -->
+  <system.data>
+    <DbProviderFactories>
+      <add name="Snowflake" invariant="Snowflake.Data" 
+           type="Snowflake.Data.Client.SnowflakeDbFactory, Snowflake.Data, Culture=neutral, PublicKeyToken=null" 
+           description="Snowflake Provider" />
+    </DbProviderFactories>
+  </system.data>
 
   <!-- 
   =========== Enable Network debug log ===============

Snowflake.Data.Tests/SFDbFactoryIT.cs

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2012-2017 Snowflake Computing Inc. All rights reserved.
+ */
+
+namespace Snowflake.Data.Tests
+{
+    using NUnit.Framework;
+    using Snowflake.Data;
+    using System.Data.Common;
+
+    [TestFixture]
+    class SFDbFactoryIT : SFBaseTest
+    {
+        [Test]
+        public void TestSimpleDbFactory()
+        {
+#if NET46
+            DbProviderFactory factory = DbProviderFactories.GetFactory("Snowflake.Data");
+#else
+            // In .NET Standard, DbProviderFactories is gone. 
+            // Reference https://weblog.west-wind.com/posts/2017/Nov/27/Working-around-the-lack-of-dynamic-DbProviderFactory-loading-in-NET-Core
+            // for more details
+            DbProviderFactory factory = Snowflake.Data.Client.SnowflakeDbFactory.Instance;
+#endif
+            DbCommand command = factory.CreateCommand();
+            DbConnection connection = factory.CreateConnection();
+            connection.ConnectionString = connectionString;
+            connection.Open();
+            // set commnad's connection object
+            command.Connection = connection;
+
+            command.CommandText = "select 1";
+            object res = command.ExecuteScalar();
+            Assert.AreEqual(1, res);
+
+            connection.Close();
+        }
+    }
+}

Snowflake.Data/Client/SnowflakeDbCommand.cs

@@ -25,6 +25,14 @@ public class SnowflakeDbCommand : DbCommand
 
         private SFLogger logger = SFLoggerFactory.GetLogger<SnowflakeDbCommand>();
 
+        public SnowflakeDbCommand()
+        {
+            logger.Debug("Constucting SnowflakeDbCommand class");
+            // by default, no query timeout
+            this.CommandTimeout = 0;
+            parameterCollection = new SnowflakeDbParameterCollection();
+        }
+
         public SnowflakeDbCommand(SnowflakeDbConnection connection)
         {
             logger.Debug("Constucting SnowflakeDbCommand class");
@@ -79,10 +87,7 @@ public override bool DesignTimeVisible
 
         public override UpdateRowSource UpdatedRowSource
         {
-            get
-            {
-                return UpdateRowSource.None;
-            }
+            get => UpdateRowSource.None;
 
             set
             {
@@ -95,14 +100,36 @@ public override UpdateRowSource UpdatedRowSource
 
         protected override DbConnection DbConnection
         {
-            get
-            {
-                return connection;
-            }
+            get => connection;
 
             set
             {
-                throw new SnowflakeDbException(SFError.UNSUPPORTED_FEATURE);
+                if (value == null)
+                {
+                    if (connection == null)
+                    {
+                        return;
+                    }
+
+                    // Unsetting connection not supported.
+                    throw new SnowflakeDbException(SFError.UNSUPPORTED_FEATURE);
+                }
+
+                if (!(value is SnowflakeDbConnection))
+                {
+                    // Must be of type SnowflakeDbConnection.
+                    throw new SnowflakeDbException(SFError.UNSUPPORTED_FEATURE);
+                }
+
+                var sfc = (SnowflakeDbConnection) value;
+                if (connection != null && connection != sfc)
+                {
+                    // Connection already set.
+                    throw new SnowflakeDbException(SFError.UNSUPPORTED_FEATURE);
+                }
+
+                connection = sfc;
+                sfStatement = new SFStatement(sfc.SfSession);
             }
         }
 

Snowflake.Data/Client/SnowflakeDbCommandBuilder.cs

@@ -0,0 +1,114 @@
+using System.Data;
+using System.Data.Common;
+using System.Globalization;
+
+namespace Snowflake.Data.Client
+{
+    public class SnowflakeDbCommandBuilder : DbCommandBuilder
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SnowflakeDbCommandBuilder"/> class.
+        /// </summary>
+        public SnowflakeDbCommandBuilder()
+            : this(null)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SnowflakeDbCommandBuilder"/> class.
+        /// </summary>
+        /// <param name="adapter">The adapter.</param>
+        public SnowflakeDbCommandBuilder(SnowflakeDbDataAdapter adapter)
+        {
+            DataAdapter = adapter;
+            QuotePrefix = "\"";
+            QuoteSuffix = "\"";
+        }
+
+        /// <summary>
+        /// Gets or sets the beginning character or characters to use when specifying database objects (for example, tables or columns) whose names contain characters such as spaces or reserved tokens.
+        /// </summary>
+        /// <returns>
+        /// The beginning character or characters to use. The default is an empty string.
+        ///   </returns>
+        ///   <PermissionSet>
+        ///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" PathDiscovery="*AllFiles*" />
+        ///   </PermissionSet>
+        public sealed override string QuotePrefix
+        {
+            get => base.QuotePrefix;
+            // TODO: Why should it be possible to remove the QuotePrefix?
+            set => base.QuotePrefix = string.IsNullOrEmpty(value) ? value : "\"";
+        }
+
+        /// <summary>
+        /// Gets or sets the ending character or characters to use when specifying database objects (for example, tables or columns) whose names contain characters such as spaces or reserved tokens.
+        /// </summary>
+        /// <returns>
+        /// The ending character or characters to use. The default is an empty string.
+        ///   </returns>
+        ///   <PermissionSet>
+        ///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" PathDiscovery="*AllFiles*" />
+        ///   </PermissionSet>
+        public sealed override string QuoteSuffix
+        {
+            get => base.QuoteSuffix;
+            // TODO: Why should it be possible to remove the QuoteSuffix?
+            set => base.QuoteSuffix = string.IsNullOrEmpty(value) ? value : "\"";
+        }
+
+        /// <summary>
+        /// Applies the parameter information.
+        /// </summary>
+        /// <param name="p">The parameter.</param>
+        /// <param name="row">The row.</param>
+        /// <param name="statementType">Type of the statement.</param>
+        /// <param name="whereClause">if set to <c>true</c> [where clause].</param>
+        protected override void ApplyParameterInfo(DbParameter p, DataRow row, StatementType statementType, bool whereClause)
+        {
+            var param = (SnowflakeDbParameter)p;
+            param.DbType = (DbType)row[SchemaTableColumn.ProviderType];
+        }
+
+        /// <summary>
+        /// Returns the name of the specified parameter in the format of #.
+        /// </summary>
+        /// <param name="parameterOrdinal">The number to be included as part of the parameter's name..</param>
+        /// <returns>
+        /// The name of the parameter with the specified number appended as part of the parameter name.
+        /// </returns>
+        protected override string GetParameterName(int parameterOrdinal)
+        {
+            return string.Format(CultureInfo.InvariantCulture, "{0}", parameterOrdinal);
+        }
+
+        /// <summary>
+        /// Returns the full parameter name, given the partial parameter name.
+        /// </summary>
+        /// <param name="parameterName">The partial name of the parameter.</param>
+        /// <returns>
+        /// The full parameter name corresponding to the partial parameter name requested.
+        /// </returns>
+        protected override string GetParameterName(string parameterName)
+        {
+            return string.Format(CultureInfo.InvariantCulture, "{0}", parameterName);
+        }
+
+        /// <summary>
+        /// Returns the placeholder for the parameter in the associated SQL statement.
+        /// </summary>
+        /// <param name="parameterOrdinal">The number to be included as part of the parameter's name.</param>
+        /// <returns>
+        /// The name of the parameter with the specified number appended.
+        /// </returns>
+        protected override string GetParameterPlaceholder(int parameterOrdinal)
+        {
+            return GetParameterName(parameterOrdinal);
+        }
+
+        /// <inheritdoc />
+        protected override void SetRowUpdatingHandler(DbDataAdapter adapter)
+        {
+        }
+    }
+}

Snowflake.Data/Client/SnowflakeDbConnection.cs

@@ -83,25 +83,27 @@ public override void ChangeDatabase(string databaseName)
 
         public override void Close()
         {
-            logger.Debug($"Close Connection.");
+            logger.Debug("Close Connection.");
 
             if (_connectionState != ConnectionState.Closed && SfSession != null)
             {
                 SfSession.close();
             }
+
+            _connectionState = ConnectionState.Closed;
         }
 
         public override void Open()
         {
-            logger.Debug($"Open Connection.");
+            logger.Debug("Open Connection.");
             SetSession();
             SfSession.Open();
             OnSessionEstablished();
         }
 
         public override Task OpenAsync(CancellationToken cancellationToken)
         {
-            logger.Debug($"Open Connection Async.");
+            logger.Debug("Open Connection Async.");
             if (cancellationToken.IsCancellationRequested)
                 return Task.FromCanceled(cancellationToken);
 
@@ -123,6 +125,13 @@ private void OnSessionEstablished()
 
         protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
         {
+            // Parameterless BeginTransaction() method of the super class calls this method with IsolationLevel.Unspecified,
+            // Change the isolation level to ReadCommitted
+            if (isolationLevel == IsolationLevel.Unspecified)
+            {
+                isolationLevel = IsolationLevel.ReadCommitted;
+            }
+
             return new SnowflakeDbTransaction(isolationLevel, this);
         }
 

Snowflake.Data/Client/SnowflakeDbConnectionStringBuilder.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Text;
+
+namespace Snowflake.Data.Client
+{
+    public class SnowflakeDbConnectionStringBuilder : DbConnectionStringBuilder
+    {
+    }
+}

Snowflake.Data/Client/SnowflakeDbFactory.cs

@@ -0,0 +1,39 @@
+using System.Data.Common;
+
+namespace Snowflake.Data.Client
+{
+    public sealed class SnowflakeDbFactory : DbProviderFactory
+    {
+        public static readonly SnowflakeDbFactory Instance = new SnowflakeDbFactory();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbCommand"/> instance.
+        /// </summary>
+        public override DbCommand CreateCommand() => new SnowflakeDbCommand();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbConnection"/> instance.
+        /// </summary>
+        public override DbConnection CreateConnection() => new SnowflakeDbConnection();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbParameter"/> instance.
+        /// </summary>
+        public override DbParameter CreateParameter() => new SnowflakeDbParameter();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbConnectionStringBuilder"/> instance.
+        /// </summary>
+        public override DbConnectionStringBuilder CreateConnectionStringBuilder() => new SnowflakeDbConnectionStringBuilder();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbCommandBuilder"/> instance.
+        /// </summary>
+        public override DbCommandBuilder CreateCommandBuilder() => new SnowflakeDbCommandBuilder();
+
+        /// <summary>
+        /// Returns a strongly typed <see cref="DbDataAdapter"/> instance.
+        /// </summary>
+        public override DbDataAdapter CreateDataAdapter() => new SnowflakeDbDataAdapter();
+    }
+}

Snowflake.Data/Client/SnowflakeDbTransaction.cs

@@ -26,7 +26,7 @@ public SnowflakeDbTransaction(IsolationLevel isolationLevel, SnowflakeDbConnecti
                 throw new SnowflakeDbException(SFError.UNSUPPORTED_FEATURE);
             }
 
-            this.isolationLevel = IsolationLevel;
+            this.isolationLevel = isolationLevel;
             this.connection = connection;
 
             using (IDbCommand command = connection.CreateCommand())

Snowflake.Data/Core/SFSessionProperty.cs

@@ -71,12 +71,12 @@ internal static SFSessionProperties parseConnectionString(String connectionStrin
                         }
                         catch (ArgumentException e)
                         {
-                            logger.Warn($"Property {token[0]} not found ignored.");
+                            logger.Warn($"Property {token[0]} not found ignored.", e);
                         }
                     }
                     else
                     {
-                        string invalidStringDetail = String.Format("Invalid kay value pair {0}", keyVal);
+                        string invalidStringDetail = String.Format("Invalid key value pair {0}", keyVal);
                         SnowflakeDbException e = new SnowflakeDbException(SFError.INVALID_CONNECTION_STRING, 
                             new object[] { invalidStringDetail });
                         logger.Error("Invalid string.", e);