Updated MySql, Oracle and PostgreSql drivers to versions currently used in projects.

Implemented fix to dialect to allow specifying which types can support being "unsigned" which fixes issues with Migrator.Net trying to create "unsigned" primary keys when their type is "Guid", "varchar(n)" etc.

Author: bittercoder

lib/MySql.Data.dll

@@ -87,7 +87,9 @@ public void MapColumnProperties(Column column)
 			if (! dialect.IdentityNeedsType)
 				AddValueIfSelected(column, ColumnProperty.Identity, vals);
 
-			AddValueIfSelected(column, ColumnProperty.Unsigned, vals);
+			if (dialect.IsUnsignedCompatible(column.Type))
+				AddValueIfSelected(column, ColumnProperty.Unsigned, vals);
+
 			if (! PropertySelected(column.ColumnProperty, ColumnProperty.PrimaryKey) || dialect.NeedsNotNullForIdentity)
 				AddValueIfSelected(column, ColumnProperty.NotNull, vals);
 

lib/Npgsql/net-2.0/Mono.Security.dll

@@ -13,6 +13,7 @@ public abstract class Dialect
 		readonly Dictionary<ColumnProperty, string> propertyMap = new Dictionary<ColumnProperty, string>();
 		readonly HashSet<string> reservedWords = new HashSet<string>();
 		readonly TypeNames typeNames = new TypeNames();
+		readonly List<DbType> unsignedCompatibleTypes = new List<DbType>();
 
 		protected Dialect()
 		{
@@ -204,5 +205,25 @@ public ColumnPropertiesMapper GetAndMapColumnProperties(Column column)
 				mapper.Default = column.DefaultValue;
 			return mapper;
 		}
+
+		/// <summary>
+		/// Subclasses register which DbTypes are unsigned-compatible (ie, available in signed and unsigned variants)
+		/// </summary>
+		/// <param name="type"></param>
+		protected void RegisterUnsignedCompatible(DbType type)
+		{
+			unsignedCompatibleTypes.Add(type);
+		}
+
+		/// <summary>
+		/// Determine if a particular database type has an unsigned variant
+		/// </summary>
+		/// <param name="type">The DbType</param>
+		/// <returns>True if the database type has an unsigned variant, otherwise false</returns>
+		public bool IsUnsignedCompatible(DbType type)
+		{
+			return unsignedCompatibleTypes.Contains(type);
+		}
+
 	}
 }