From a27d49b1887700d78498ee0a369c2b3d93d2642c Mon Sep 17 00:00:00 2001
From: AlexRa
Date: Tue, 18 May 2010 14:19:19 +0300
Subject: Added DBGuids.cs  (static func DBGuid.FromDB()

This DBMS-independent function to be used converting UUIDs
from whatever format used in the DB (string/binary/Guid).
This is mostly needed for MySQL, as in MSSQL they are always
UNIQUEIDENTIFIERs and in SQLite always strings (but would look
better if we use it there anyway).
---
 OpenSim/Data/DBGuids.cs | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 OpenSim/Data/DBGuids.cs

diff --git a/OpenSim/Data/DBGuids.cs b/OpenSim/Data/DBGuids.cs
new file mode 100644
index 0000000..1a13e06
--- /dev/null
+++ b/OpenSim/Data/DBGuids.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenMetaverse;
+
+namespace OpenSim.Data
+{
+
+    public static class DBGuid
+    {
+        /// <summary>This function converts a value returned from the database in one of the
+        /// supported formats into a UUID.  This function is not actually DBMS-specific right
+        /// now
+        /// 
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        public static UUID FromDB(object id)
+        {
+            if( (id == null) || (id == DBNull.Value))
+                return UUID.Zero;
+
+            if (id.GetType() == typeof(Guid))
+                return new UUID((Guid)id);
+
+            if (id.GetType() == typeof(byte[]))
+            {
+                if (((byte[])id).Length == 0)
+                    return UUID.Zero;
+                else if (((byte[])id).Length == 36)
+                    return new UUID((byte[])id, 0);
+            }
+            else if (id.GetType() == typeof(string))
+            {
+                if (((string)id).Length == 0)
+                    return UUID.Zero;
+                else if (((string)id).Length == 36)
+                    return new UUID((string)id);
+            }
+
+            throw new Exception("Failed to convert db value to UUID: " + id.ToString());
+        }
+    }
+}
-- 
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