Support ReadOnyMemory<byte> in prepared commands.

Author: bgrainger

src/MySqlConnector/MySql.Data.MySqlClient/MySqlParameter.cs

@@ -457,6 +457,11 @@ internal void AppendBinary(ByteBufferWriter writer, StatementPreparerOptions opt
 				writer.WriteLengthEncodedInteger(unchecked((ulong) byteArrayValue.Length));
 				writer.Write(byteArrayValue);
 			}
+			else if (Value is ReadOnlyMemory<byte> readOnlyMemoryValue)
+			{
+				writer.WriteLengthEncodedInteger(unchecked((ulong) readOnlyMemoryValue.Length));
+				writer.Write(readOnlyMemoryValue.Span);
+			}
 			else if (Value is float floatValue)
 			{
 				writer.Write(BitConverter.GetBytes(floatValue));

tests/SideBySide/InsertTests.cs

@@ -413,6 +413,28 @@ value mediumblob null
 				Assert.Equal(new byte[] { 1, 2, 3, 4, 5, 6 }, connection.Query<byte[]>(@"select value from insert_mysql_blob;").Single());
 			}
 		}
+
+		[Fact]
+		public void InsertReadOnlyMemoryPrepared()
+		{
+			using (var connection = new MySqlConnection(AppConfig.ConnectionString + ";IgnorePrepare=false"))
+			{
+				connection.Open();
+				connection.Execute(@"drop table if exists insert_mysql_blob;
+create table insert_mysql_blob(
+	rowid integer not null primary key auto_increment,
+	value mediumblob null
+);");
+
+				using (var cmd = new MySqlCommand("insert into insert_mysql_blob(value) values(@data);", connection))
+				{
+					cmd.Parameters.AddWithValue("@data", new ReadOnlyMemory<byte>(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 }, 1, 6));
+					cmd.Prepare();
+					cmd.ExecuteNonQuery();
+				}
+				Assert.Equal(new byte[] { 1, 2, 3, 4, 5, 6 }, connection.Query<byte[]>(@"select value from insert_mysql_blob;").Single());
+			}
+		}
 #endif
 
 		readonly DatabaseFixture m_database;