Fix NotSupportedException in MySqlParameter.

Set properties to their default versions as specified in MSDN documentation.

Author: bgrainger

src/MySqlConnector/MySqlClient/MySqlParameter.cs

@@ -11,11 +11,15 @@ public sealed class MySqlParameter : DbParameter
 		public MySqlParameter()
 		{
 			m_mySqlDbType = MySqlDbType.VarChar;
+			SourceColumn = "";
+#if !NETSTANDARD1_3
+			SourceVersion = DataRowVersion.Current;
+#endif
 		}
 
 		public MySqlParameter(string name, object objValue)
+			: this()
 		{
-			m_mySqlDbType = MySqlDbType.VarChar;
 			ParameterName = name;
 			Value = objValue;
 		}
@@ -73,24 +77,12 @@ public override string ParameterName
 
 		public override int Size { get; set; }
 
-		public override string SourceColumn
-		{
-			get { throw new NotSupportedException(); }
-			set { throw new NotSupportedException(); }
-		}
+		public override string SourceColumn { get; set; }
 
-		public override bool SourceColumnNullMapping
-		{
-			get { throw new NotSupportedException(); }
-			set { throw new NotSupportedException(); }
-		}
+		public override bool SourceColumnNullMapping { get; set; }
 
 #if !NETSTANDARD1_3
-		public override DataRowVersion SourceVersion
-		{
-			get { throw new NotSupportedException(); }
-			set { throw new NotSupportedException(); }
-		}
+		public override DataRowVersion SourceVersion { get; set; }
 #endif
 
 		public override object Value { get; set; }