Thank you kindly, TLaukkan (Tommil) for a patch that:

* Created value object for EstateRegionLink for storing the estate region relationship.
* Refactored slightly NHibernateManager and NHibernateXXXXData implementations for accesing nhibernate generated ID on insert.
** Changed NHibernateManager.Save method name to Insert as it does Insert.
** Changed NHibernateManager.Save return value object as ID can be both UUID and uint currently.
** Changed NHibernateManager.Load method Id parameter to object as it can be both UUID and uint.
* Created NHibernateEstateData implementation. This is the actual estate storage.
* Created NHibernate mapping files for both EstateSettings and EstateRegionLink
* Created MigrationSyntaxDifferences.txt files to write notes about differences in migration scripts between different databases.
* Created estate storage migration scripts for all four databases.
* Created estate unit test classes for all four databases.
* Updated one missing field to BasicEstateTest.cs
* Tested NHibernate unit tests with NUnit GUI. Asset databases fail but that is not related to this patch.
* Tested build with both Visual Studio and nant.
* Executed build tests with nant succesfully.

OpenSim/Data/NHibernate/Resources/EstateRegionLink.hbm.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
+    <class name="OpenSim.Data.NHibernate.EstateRegionLink, OpenSim.Data.NHibernate" table="EstateRegionLink" lazy="false">
+      <id name="EstateRegionLinkID" column="EstateRegionLinkID" type="OpenSim.Data.NHibernate.UUIDUserType, OpenSim.Data.NHibernate"> 
+          <generator class="assigned" /> 
+        </id>
+
+        <property name="EstateID" type="OpenSim.Data.NHibernate.UInt32Type, OpenSim.Data.NHibernate" />
+        <property name="RegionID" type="OpenSim.Data.NHibernate.UUIDUserType, OpenSim.Data.NHibernate" />
+      
+    </class>
+</hibernate-mapping>

OpenSim/Data/NHibernate/Resources/EstateSettings.hbm.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
+    <class name="OpenSim.Framework.EstateSettings, OpenSim.Framework" table="EstateSettings" lazy="false">
+        
+        <id name="EstateID" column="EstateID" type="OpenSim.Data.NHibernate.UInt32Type, OpenSim.Data.NHibernate"> 
+          <generator class="increment" /> 
+        </id>
+
+        <property name="ParentEstateID" type="OpenSim.Data.NHibernate.UInt32Type, OpenSim.Data.NHibernate" />
+        <property name="EstateOwner" column="EstateOwnerID" type="OpenSim.Data.NHibernate.UUIDUserType, OpenSim.Data.NHibernate" />
+        
+        <property name="EstateName" column="Name" type="String" length="64" />
+
+        <property name="RedirectGridX" type="System.Int32" />
+        <property name="RedirectGridY" type="System.Int32" />
+
+        <property name="BillableFactor" type="System.Single" />
+        <property name="PricePerMeter" type="System.Int32" />                
+        <property name="SunPosition" type="System.Double" />
+
+        <property name="UseGlobalTime" type="System.Boolean" />
+        <property name="FixedSun" type="System.Boolean" />
+        <property name="AllowVoice" type="System.Boolean" />
+        <property name="AllowDirectTeleport" type="System.Boolean" />
+        <property name="ResetHomeOnTeleport" type="System.Boolean" />
+        <property name="PublicAccess" type="System.Boolean" />
+        <property name="DenyAnonymous" type="System.Boolean" />
+        <property name="DenyIdentified" type="System.Boolean" />
+        <property name="DenyTransacted" type="System.Boolean" />
+        <property name="DenyMinors" type="System.Boolean" />
+        <property name="BlockDwell" type="System.Boolean" />
+        <property name="EstateSkipScripts" type="System.Boolean" />
+        <property name="TaxFree" type="System.Boolean" />
+        <property name="AbuseEmailToEstateOwner" type="System.Boolean" />
+      
+        <property name="AbuseEmail" type="String" length="255" />
+
+    </class>
+</hibernate-mapping>

OpenSim/Data/NHibernate/Resources/MigrationSyntaxDifferences.txt

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+?This file describes the differences in schema creation and migration scripts.
+
+MySQL is used as reference script against which differences are listed.
+
+Generally MySQL create table options should be removed for other databases.
+
+_PostgreSQL_
+* DOUBLE->DOUBLE PRECISION
+* BIT->BOOLEAN
+
+_MsSql_
+* VARCHAR->NVARCHAR
+* Remove DEFAULT-keywords
+* DOUBLE->REAL

OpenSim/Data/NHibernate/Resources/MsSql2005Dialect/001_EstateStore.sql

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+CREATE TABLE EstateSettings (
+  EstateID INT NOT NULL,
+  ParentEstateID INT NULL,
+  EstateOwnerID NVARCHAR(36) NULL,
+  Name NVARCHAR(64) NULL,
+  RedirectGridX INT NULL,
+  RedirectGridY INT NULL,
+  BillableFactor REAL NULL,
+  PricePerMeter INT NULL,
+  SunPosition REAL NULL,
+  
+  UseGlobalTime BIT NULL,
+  FixedSun BIT NULL,
+  AllowVoice BIT NULL,
+  AllowDirectTeleport BIT NULL,
+  ResetHomeOnTeleport BIT NULL,
+  PublicAccess BIT NULL,
+  DenyAnonymous BIT NULL,
+  DenyIdentified BIT NULL,
+  DenyTransacted BIT NULL,
+  DenyMinors BIT NULL,
+  BlockDwell BIT NULL,
+  EstateSkipScripts BIT NULL,
+  TaxFree BIT NULL,
+  AbuseEmailToEstateOwner BIT NULL,
+  
+  AbuseEmail NVARCHAR(255) NULL,
+
+  PRIMARY KEY (EstateID)
+);
+
+CREATE TABLE EstateRegionLink (
+  EstateRegionLinkID NVARCHAR(36) NOT NULL,
+  EstateID INT NULL,
+  RegionID NVARCHAR(36) NULL,
+  PRIMARY KEY (EstateRegionLinkID)
+);
+
+CREATE INDEX EstateRegionLinkEstateIDIndex ON EstateRegionLink (EstateID);
+CREATE INDEX EstateRegionLinkERegionIDIndex ON EstateRegionLink (RegionID);

OpenSim/Data/NHibernate/Resources/MySQLDialect/001_EstateStore.sql

@@ -0,0 +1,40 @@
+CREATE TABLE EstateSettings (
+  EstateID INT NOT NULL,
+  ParentEstateID INT DEFAULT NULL,
+  EstateOwnerID VARCHAR(36) DEFAULT NULL,
+  Name VARCHAR(64) DEFAULT NULL,
+  RedirectGridX INT DEFAULT NULL,
+  RedirectGridY INT DEFAULT NULL,
+  BillableFactor DOUBLE DEFAULT NULL,
+  PricePerMeter INT DEFAULT NULL,
+  SunPosition DOUBLE DEFAULT NULL,
+  
+  UseGlobalTime BIT DEFAULT NULL,
+  FixedSun BIT DEFAULT NULL,
+  AllowVoice BIT DEFAULT NULL,
+  AllowDirectTeleport BIT DEFAULT NULL,
+  ResetHomeOnTeleport BIT DEFAULT NULL,
+  PublicAccess BIT DEFAULT NULL,
+  DenyAnonymous BIT DEFAULT NULL,
+  DenyIdentified BIT DEFAULT NULL,
+  DenyTransacted BIT DEFAULT NULL,
+  DenyMinors BIT DEFAULT NULL,
+  BlockDwell BIT DEFAULT NULL,
+  EstateSkipScripts BIT DEFAULT NULL,
+  TaxFree BIT DEFAULT NULL,
+  AbuseEmailToEstateOwner BIT DEFAULT NULL,
+  
+  AbuseEmail VARCHAR(255) DEFAULT NULL,
+
+  PRIMARY KEY (EstateID)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Rev. 1';
+
+CREATE TABLE EstateRegionLink (
+  EstateRegionLinkID VARCHAR(36) NOT NULL,
+  EstateID INT DEFAULT NULL,
+  RegionID VARCHAR(36) DEFAULT NULL,
+  PRIMARY KEY (EstateRegionLinkID)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Rev. 1';
+
+CREATE INDEX EstateRegionLinkEstateIDIndex ON EstateRegionLink (EstateID);
+CREATE INDEX EstateRegionLinkERegionIDIndex ON EstateRegionLink (RegionID);

OpenSim/Data/NHibernate/Resources/PostgreSQLDialect/001_EstateStore.sql

@@ -0,0 +1,40 @@
+CREATE TABLE EstateSettings (
+  EstateID INT NOT NULL,
+  ParentEstateID INT DEFAULT NULL,
+  EstateOwnerID VARCHAR(36) DEFAULT NULL,
+  Name VARCHAR(64) DEFAULT NULL,
+  RedirectGridX INT DEFAULT NULL,
+  RedirectGridY INT DEFAULT NULL,
+  BillableFactor DOUBLE PRECISION DEFAULT NULL,
+  PricePerMeter INT DEFAULT NULL,
+  SunPosition DOUBLE PRECISION DEFAULT NULL,
+  
+  UseGlobalTime BOOLEAN DEFAULT NULL,
+  FixedSun BOOLEAN DEFAULT NULL,
+  AllowVoice BOOLEAN DEFAULT NULL,
+  AllowDirectTeleport BOOLEAN DEFAULT NULL,
+  ResetHomeOnTeleport BOOLEAN DEFAULT NULL,
+  PublicAccess BOOLEAN DEFAULT NULL,
+  DenyAnonymous BOOLEAN DEFAULT NULL,
+  DenyIdentified BOOLEAN DEFAULT NULL,
+  DenyTransacted BOOLEAN DEFAULT NULL,
+  DenyMinors BOOLEAN DEFAULT NULL,
+  BlockDwell BOOLEAN DEFAULT NULL,
+  EstateSkipScripts BOOLEAN DEFAULT NULL,
+  TaxFree BOOLEAN DEFAULT NULL,
+  AbuseEmailToEstateOwner BOOLEAN DEFAULT NULL,
+  
+  AbuseEmail VARCHAR(255) DEFAULT NULL,
+
+  PRIMARY KEY (EstateID)
+);
+
+CREATE TABLE EstateRegionLink (
+  EstateRegionLinkID VARCHAR(36) NOT NULL,
+  EstateID INT DEFAULT NULL,
+  RegionID VARCHAR(36) DEFAULT NULL,
+  PRIMARY KEY (EstateRegionLinkID)
+);
+
+CREATE INDEX EstateRegionLinkEstateIDIndex ON EstateRegionLink (EstateID);
+CREATE INDEX EstateRegionLinkERegionIDIndex ON EstateRegionLink (RegionID);

OpenSim/Data/NHibernate/Resources/SQLiteDialect/001_EstateStore.sql

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+CREATE TABLE EstateSettings (
+  EstateID INT NOT NULL,
+  ParentEstateID INT DEFAULT NULL,
+  EstateOwnerID VARCHAR(36) DEFAULT NULL,
+  Name VARCHAR(64) DEFAULT NULL,
+  RedirectGridX INT DEFAULT NULL,
+  RedirectGridY INT DEFAULT NULL,
+  BillableFactor DOUBLE DEFAULT NULL,
+  PricePerMeter INT DEFAULT NULL,
+  SunPosition DOUBLE DEFAULT NULL,
+  
+  UseGlobalTime BIT DEFAULT NULL,
+  FixedSun BIT DEFAULT NULL,
+  AllowVoice BIT DEFAULT NULL,
+  AllowDirectTeleport BIT DEFAULT NULL,
+  ResetHomeOnTeleport BIT DEFAULT NULL,
+  PublicAccess BIT DEFAULT NULL,
+  DenyAnonymous BIT DEFAULT NULL,
+  DenyIdentified BIT DEFAULT NULL,
+  DenyTransacted BIT DEFAULT NULL,
+  DenyMinors BIT DEFAULT NULL,
+  BlockDwell BIT DEFAULT NULL,
+  EstateSkipScripts BIT DEFAULT NULL,
+  TaxFree BIT DEFAULT NULL,
+  AbuseEmailToEstateOwner BIT DEFAULT NULL,
+  
+  AbuseEmail VARCHAR(255) DEFAULT NULL,
+
+  PRIMARY KEY (EstateID)
+);
+
+CREATE TABLE EstateRegionLink (
+  EstateRegionLinkID VARCHAR(36) NOT NULL,
+  EstateID INT DEFAULT NULL,
+  RegionID VARCHAR(36) DEFAULT NULL,
+  PRIMARY KEY (EstateRegionLinkID)
+);
+
+CREATE INDEX EstateRegionLinkEstateIDIndex ON EstateRegionLink (EstateID);
+CREATE INDEX EstateRegionLinkERegionIDIndex ON EstateRegionLink (RegionID);