update samples.

appveyor.yml

@@ -4,7 +4,7 @@ environment:
   BUILDING_ON_PLATFORM: win
   BuildEnvironment: appveyor
   Cap_SqlServer_ConnectionStringTemplate: Server=(local)\SQL2014;Database={0};User ID=sa;Password=Password12!
-  Cap_MySql_ConnectionStringTemplate: Server=localhost;Database={0};Uid=root;Pwd=Password12!
+  Cap_MySql_ConnectionStringTemplate: Server=localhost;Database={0};Uid=root;Pwd=Password12!;Allow User Variables=True
   Cap_PostgreSql_ConnectionStringTemplate: Server=localhost;Database={0};UserId=postgres;Password=Password12!
 services:
   - mssql2014

samples/Sample.RabbitMQ.MySql/AppDbContext.cs

@@ -10,7 +10,7 @@ namespace Sample.RabbitMQ.MySql
     {
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
         {
-            optionsBuilder.UseMySql("Server=localhost;Database=Sample.RabbitMQ.MySql;UserId=root;Password=123123;");
+            optionsBuilder.UseMySql("Server=localhost;Database=Sample.RabbitMQ.MySql;UserId=root;Password=123123;Allow User Variables=True");
             //optionsBuilder.UseMySql("Server=192.168.2.206;Database=Sample.RabbitMQ.MySql;UserId=root;Password=123123;");
         }
     }

src/DotNetCore.CAP.MySql/MySqlStorageConnection.cs

@@ -41,8 +41,8 @@ namespace DotNetCore.CAP.MySql
         public Task<IFetchedMessage> FetchNextMessageAsync()
         {
             var sql = $@"
-SELECT @MessageId:=`MessageId` as MessageId, @MessageType:=`MessageType` as MessageType FROM `{_prefix}.queue` LIMIT 1;
-DELETE FROM `{_prefix}.queue` where `MessageId` = @MessageId AND `MessageType`=@MessageType;";
+SELECT @MId:=`MessageId` as MessageId, @MType:=`MessageType` as MessageType FROM `{_prefix}.queue` LIMIT 1;
+DELETE FROM `{_prefix}.queue` where `MessageId` = @MId AND `MessageType`=@MType;";
 
             return FetchNextMessageCoreAsync(sql);
         }

test/DotNetCore.CAP.MySql.Test/ConnectionUtil.cs

@@ -12,7 +12,7 @@ namespace DotNetCore.CAP.MySql.Test
         private const string DefaultDatabaseName = @"DotNetCore.CAP.MySql.Test";
 
         private const string DefaultConnectionStringTemplate =
-            @"Server=localhost;Database={0};Uid=root;Pwd=123123;";
+            @"Server=localhost;Database={0};Uid=root;Pwd=123123;Allow User Variables=True;";
 
         public static string GetDatabaseName()
         {

test/DotNetCore.CAP.MySql.Test/MySqlStorageConnectionTest.cs

@@ -52,11 +52,12 @@ namespace DotNetCore.CAP.MySql.Test
             {
                 connection.Execute(sql, queue);
             }
-            var fetchedMessage = await _storage.FetchNextMessageAsync();
-            fetchedMessage.Dispose();
-            Assert.NotNull(fetchedMessage);
-            Assert.Equal(MessageType.Publish, fetchedMessage.MessageType);
-            Assert.Equal(3333, fetchedMessage.MessageId);
+            using (var fetchedMessage = await _storage.FetchNextMessageAsync())
+            {
+                Assert.NotNull(fetchedMessage);
+                Assert.Equal(MessageType.Publish, fetchedMessage.MessageType);
+                Assert.Equal(3333, fetchedMessage.MessageId);
+            }
         }
 
         [Fact]

test/DotNetCore.CAP.Test/ConsumerInvokerFactoryTest.cs

@@ -48,7 +48,7 @@ namespace DotNetCore.CAP.Test
         [Theory]
         [InlineData(nameof(Sample.ThrowException))]
         [InlineData(nameof(Sample.AsyncMethod))]
-        public async void InvokeMethodTest(string methodName)
+        public void InvokeMethodTest(string methodName)
         {
             var methodInfo = typeof(Sample).GetRuntimeMethods()
                 .Single(x => x.Name == methodName);
@@ -64,10 +64,10 @@ namespace DotNetCore.CAP.Test
 
             var invoker = consumerInvokerFactory.CreateInvoker(context);
 
-            await Assert.ThrowsAsync(typeof(Exception), async () =>
+            Assert.Throws<Exception>(() =>
             {
-                await invoker.InvokeAsync();
-            });
+                invoker.InvokeAsync().GetAwaiter().GetResult();
+            }); 
         }
     }
 }
\ No newline at end of file

test/DotNetCore.CAP.Test/OperateResultTest.cs

@@ -11,7 +11,7 @@ namespace DotNetCore.CAP.Test
             var result = new OperateResult();
 
             Assert.False(result.Succeeded);
-            Assert.Equal(0, result.Errors.Count());
+            Assert.Empty(result.Errors);
         }
 
         [Fact]
@@ -20,7 +20,7 @@ namespace DotNetCore.CAP.Test
             var result = OperateResult.Failed();
 
             Assert.False(result.Succeeded);
-            Assert.Equal(0, result.Errors.Count());
+            Assert.Empty(result.Errors);
         }
     }
 }
\ No newline at end of file