diff --git a/Builder/IISMainHandler/build.txt b/Builder/IISMainHandler/build.txt
index 47c57f6..69341ae 100644
--- a/Builder/IISMainHandler/build.txt
+++ b/Builder/IISMainHandler/build.txt
@@ -1 +1 @@
-1981
\ No newline at end of file
+1985
\ No newline at end of file
diff --git a/FLocal.Patcher.Common/PatcherConfiguration.cs b/FLocal.Patcher.Common/PatcherConfiguration.cs
index 5e5dd7c..b35d07c 100644
--- a/FLocal.Patcher.Common/PatcherConfiguration.cs
+++ b/FLocal.Patcher.Common/PatcherConfiguration.cs
@@ -13,22 +13,30 @@ namespace FLocal.Patcher.Common {
 
 		private readonly string _DbDriverName;
 		public string DbDriverName {
-			get { throw new NotImplementedException(); }
+			get {
+				return this._DbDriverName;
+			}
 		}
 
 		private readonly string _GuestConnectionString;
 		public string GuestConnectionString {
-			get { throw new NotImplementedException(); }
+			get {
+				return this._GuestConnectionString;
+			}
 		}
 
 		private readonly string _PatchesTable;
 		public string PatchesTable {
-			get { throw new NotImplementedException(); }
+			get {
+				return this._PatchesTable;
+			}
 		}
 
 		private readonly string _EnvironmentName;
 		public string EnvironmentName {
-			get { throw new NotImplementedException(); }
+			get {
+				return this._EnvironmentName;
+			}
 		}
 
 		public IEnumerable<PatchId> getPatchesList() {
@@ -40,10 +48,10 @@ namespace FLocal.Patcher.Common {
 		}
 
 		protected PatcherConfiguration(NameValueCollection data) : base() {
-			this._DbDriverName = data["Patcher.DbDriver"];
-			this._EnvironmentName = data["Patcher.EnvironmentName"];
-			this._GuestConnectionString = data["ConnectionString"];
-			this._PatchesTable = data["Patcher.PatchesTable"];
+			this._DbDriverName = data["Patcher.DbDriver"].ToString();
+			this._EnvironmentName = data["Patcher.EnvironmentName"].ToString();
+			this._GuestConnectionString = data["ConnectionString"].ToString();
+			this._PatchesTable = data["Patcher.PatchesTable"].ToString();
 		}
 
 		public static void Init(NameValueCollection data) {
diff --git a/FLocal.Patcher.IISHandler/MainHandler.cs b/FLocal.Patcher.IISHandler/MainHandler.cs
index 38ae00b..638daf0 100644
--- a/FLocal.Patcher.IISHandler/MainHandler.cs
+++ b/FLocal.Patcher.IISHandler/MainHandler.cs
@@ -15,7 +15,7 @@ namespace FLocal.Patcher.IISHandler {
 		}
 
 		protected override string GetAdminConnectionString(HttpContext context) {
-			throw new NotImplementedException();
+			return System.Configuration.ConfigurationManager.AppSettings["Patcher.AdminConnectionString"].Replace("{password}", context.Request.Form["data"]);
 		}
 
 	}
diff --git a/Patcher.Web/CheckParams.cs b/Patcher.Web/CheckParams.cs
index 5086e24..2fa0ba7 100644
--- a/Patcher.Web/CheckParams.cs
+++ b/Patcher.Web/CheckParams.cs
@@ -7,7 +7,7 @@ using Patcher.Data.Patch;
 namespace Patcher.Web {
 	class CheckParams : ICheckParams {
 
-		private readonly IPatcherConfiguration configuration;
+		protected readonly IPatcherConfiguration configuration;
 
 		public CheckParams(IPatcherConfiguration configuration) {
 			this.configuration = configuration;
@@ -19,7 +19,7 @@ namespace Patcher.Web {
 			}
 		}
 
-		public string ConnectionString {
+		public virtual string ConnectionString {
 			get {
 				return this.configuration.GuestConnectionString;
 			}
diff --git a/Patcher.Web/InteractiveResponseStream.cs b/Patcher.Web/InteractiveResponseStream.cs
new file mode 100644
index 0000000..2b11521
--- /dev/null
+++ b/Patcher.Web/InteractiveResponseStream.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Web.Core;
+using System.Web;
+
+namespace Patcher.Web {
+	class InteractiveResponseStream : IInteractiveConsole {
+
+		private readonly HttpContext context;
+
+		public void Report(string message) {
+			this.context.Response.Output.WriteLine(message);
+		}
+
+		public void Report(string format, params object[] data) {
+			this.context.Response.Output.WriteLine(format, data);
+		}
+
+		public bool IsInteractive {
+			get {
+				return false;
+			}
+		}
+
+		public bool Ask(string question) {
+			throw new NotImplementedException();
+		}
+
+		public void WaitForUserAction() {
+			throw new NotImplementedException();
+		}
+
+		public InteractiveResponseStream(HttpContext context) {
+			this.context = context;
+		}
+
+	}
+}
diff --git a/Patcher.Web/MainHandler.cs b/Patcher.Web/MainHandler.cs
index a2218b7..80d2811 100644
--- a/Patcher.Web/MainHandler.cs
+++ b/Patcher.Web/MainHandler.cs
@@ -18,16 +18,35 @@ namespace Patcher.Web {
 		}
 
 		private void Install(HttpContext context) {
-			var writer = context.Response.Output;
-			writer.WriteLine("<p>Installing...</p>");
+			context.Response.ContentType = "text/plain";
+			context.Response.Output.WriteLine("Installing...");
 			System.Threading.Thread.Sleep(TimeSpan.FromSeconds(2));
-			this.patcherInfo.AreNewPatchesInstalled = true;
-			writer.WriteLine("<p>Installed</p>");
+			var updater = new Updater(new UpdateParams(this.patcherInfo.configuration, this.GetAdminConnectionString(context)), new InteractiveResponseStream(context));
+			int resultCode = updater.ApplyAll();
+			if(resultCode == 0) {
+				this.patcherInfo.AreNewPatchesInstalled = true;
+				context.Response.Output.WriteLine("Installed");
+			} else {
+				context.Response.Output.WriteLine("Failed to install: error code {0}", resultCode);
+			}
 		}
 
 		private void ShowInfo(HttpContext context) {
 			var writer = context.Response.Output;
-			writer.WriteLine("<form method=\"POST\"><input type=\"hidden\" name=\"install\" value=\"install\"/><input type=\"submit\" value=\"Install!\"/></form>");
+			var checker = new Checker(new CheckParams(this.patcherInfo.configuration));
+			int totalPatches = 0;
+			foreach(var patchId in checker.GetPatchesToInstall()) {
+				writer.WriteLine("<p>{0}: \"{1}\"</p>", patchId.version, patchId.name);
+				totalPatches++;
+			}
+			writer.WriteLine("<p>Total patches: {0}", totalPatches);
+			if(totalPatches > 0) {
+				writer.WriteLine("<form method=\"POST\">");
+				writer.WriteLine("<input type=\"text\" name=\"data\"/><br/>");
+				writer.WriteLine("<input type=\"hidden\" name=\"install\" value=\"install\"/>");
+				writer.WriteLine("<input type=\"submit\" value=\"Install!\"/>");
+				writer.WriteLine("</form>");
+			}
 		}
 
 		public void ProcessRequest(HttpContext context) {
diff --git a/Patcher.Web/Patcher.Web.csproj b/Patcher.Web/Patcher.Web.csproj
index a92adf9..6a28c65 100644
--- a/Patcher.Web/Patcher.Web.csproj
+++ b/Patcher.Web/Patcher.Web.csproj
@@ -47,10 +47,12 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CheckParams.cs" />
+    <Compile Include="InteractiveResponseStream.cs" />
     <Compile Include="MainHandler.cs" />
     <Compile Include="IPatcherConfiguration.cs" />
     <Compile Include="PatcherInfo.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UpdateParams.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Patcher\Patcher.csproj">
diff --git a/Patcher.Web/UpdateParams.cs b/Patcher.Web/UpdateParams.cs
new file mode 100644
index 0000000..7758828
--- /dev/null
+++ b/Patcher.Web/UpdateParams.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.IO;
+using Patcher.Data.Patch;
+
+namespace Patcher.Web {
+	class UpdateParams : CheckParams, IUpdateParams {
+
+		private readonly string AdminConnectionString;
+
+		public UpdateParams(IPatcherConfiguration configuration, string AdminConnectionString) : base(configuration) {
+			this.AdminConnectionString = AdminConnectionString;
+		}
+
+		public override string ConnectionString {
+			get {
+				return this.AdminConnectionString;
+			}
+		}
+
+		public string EnvironmentName {
+			get {
+				return configuration.EnvironmentName;
+			}
+		}
+
+		public Stream loadPatch(PatchId patchId) {
+			return configuration.loadPatch(patchId);
+		}
+
+	}
+}
diff --git a/Patcher/Checker.cs b/Patcher/Checker.cs
index c59c799..0d38f23 100644
--- a/Patcher/Checker.cs
+++ b/Patcher/Checker.cs
@@ -25,30 +25,30 @@ namespace Patcher {
 					from patchId in this.checkParams.getPatchesList()
 					orderby patchId ascending
 					select patchId,
-					from row in transaction.ExecuteReader(
-						string.Format(
-							"select {1}, {2} from {0} where {3} = {4}",
-							transaction.EscapeName(this.checkParams.PatchesTable),
-							transaction.EscapeName("VERSION"),
-							transaction.EscapeName("NAME"),
-							transaction.EscapeName("STATUS"),
-							transaction.MarkParam("pstatus")
-						),
-						new Dictionary<string, object> {
-							{ "pstatus", STATUS_INSTALLED },
-						}
-					)
-					let patch = new PatchId(int.Parse(row["VERSION"]), row["NAME"])
-					orderby patch ascending
-					select patch
+					(
+						from row in transaction.ExecuteReader(
+							string.Format(
+								"select {1}, {2} from {0} where {3} = {4}",
+								transaction.EscapeName(this.checkParams.PatchesTable),
+								transaction.EscapeName("VERSION"),
+								transaction.EscapeName("NAME"),
+								transaction.EscapeName("STATUS"),
+								transaction.MarkParam("pstatus")
+							),
+							new Dictionary<string, object> {
+								{ "pstatus", STATUS_INSTALLED },
+							}
+						)
+						let patch = new PatchId(int.Parse(row["VERSION"]), row["NAME"])
+						orderby patch ascending
+						select patch
+					).ToList()
 				);
 			}
 		}
 
 		public bool IsNeedsPatching() {
-			System.Threading.Thread.Sleep(TimeSpan.FromSeconds(2));
-			return true;
-			//return this.GetPatchesToInstall().Any();
+			return this.GetPatchesToInstall().Any();
 		}
 
 	}
diff --git a/Patcher/DB/DBTraitsFactory.cs b/Patcher/DB/DBTraitsFactory.cs
index 58d951b..318e6a5 100644
--- a/Patcher/DB/DBTraitsFactory.cs
+++ b/Patcher/DB/DBTraitsFactory.cs
@@ -12,6 +12,8 @@ namespace Patcher.DB {
 					return OracleDBTraits.instance;
 				case "oracle-faketransactional":
 					return OracleFakeTransactionalDBTraits.instance;
+				case "postgres":
+					return PostgresDBTraits.instance;
 				default:
 					throw new NotImplementedException();
 			}
diff --git a/Patcher/DB/PostgresDBTraits.cs b/Patcher/DB/PostgresDBTraits.cs
new file mode 100644
index 0000000..e80e176
--- /dev/null
+++ b/Patcher/DB/PostgresDBTraits.cs
@@ -0,0 +1,222 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using Npgsql;
+
+namespace Patcher.DB {
+
+	class PostgresDBTraits : IDBTraits {
+
+		public static readonly IDBTraits instance = new PostgresDBTraits();
+
+		protected PostgresDBTraits() {
+		}
+
+		private static readonly Regex ALPHANUMERIC = new Regex("^[a-zA-Z]\\w*$", RegexOptions.Compiled | RegexOptions.Singleline);
+
+		private static string _EscapeName(string name) {
+			if(!ALPHANUMERIC.IsMatch(name)) throw new ApplicationException("Name should contain only alphanumeric characters");
+			return string.Format("\"{0}\"", name);
+		}
+
+		string IDBTraits.EscapeName(string name) {
+			return _EscapeName(name);
+		}
+
+		DbConnection IDBTraits.CreateConnection(string connectionString) {
+			NpgsqlConnection connection = new NpgsqlConnection(connectionString);
+			connection.Open();
+			return connection;
+		}
+
+		string IDBTraits.MarkParam(string paramName) {
+			if(!ALPHANUMERIC.IsMatch(paramName)) throw new ApplicationException("Name should contain only alphanumeric characters");
+			return ":" + paramName;
+		}
+
+		string IDBTraits.ParamName(string paramName) {
+			if(!ALPHANUMERIC.IsMatch(paramName)) throw new ApplicationException("Name should contain only alphanumeric characters");
+			return paramName;
+		}
+
+		private static void AddParam(DbCommand command, string name, DbType type, object value) {
+			var param = command.CreateParameter();
+			param.ParameterName = name;
+			param.DbType = type;
+			param.Value = value;
+			command.Parameters.Add(param);
+		}
+
+		private static bool ParseBoolString(string value) {
+			switch(value.ToLower()) {
+				case "n":
+					return false;
+				case "y":
+					return true;
+				default:
+					throw new ApplicationException(string.Format("Unknown value {0}", value));
+			}
+		}
+
+		private static T CastResult<T>(object value) where T : class {
+			if(DBNull.Value.Equals(value)) {
+				return null;
+			} else {
+				return (T)value;
+			}
+		}
+
+		private static T? CastScalarResult<T>(object value) where T : struct {
+			if(DBNull.Value.Equals(value)) {
+				return null;
+			} else {
+				return (T)value;
+			}
+		}
+
+		private static readonly SQLQueryManager _SQLQueryManager = new SQLQueryManager(_EscapeName);
+
+		StoredProcedureBody IDBTraits.GetStoredProcedureBody(Func<DbCommand> commandCreator, StoredProcedureReference procedure) {
+			throw new NotImplementedException();
+		}
+
+		private static string FormatStoredProcedureHeader(StoredProcedureReference procedure) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.ReplaceStoredProcedureBody(Func<DbCommand> commandCreator, StoredProcedureReference procedure, StoredProcedureBody newBody) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.RemoveStoredProcedure(Func<DbCommand> commandCreator, StoredProcedureReference procedure) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.CreateView(Func<DbCommand> commandCreator, string viewName, string body) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.RemoveView(Func<DbCommand> commandCreator, string viewName) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.CreateStoredProcedure(Func<DbCommand> commandCreator, StoredProcedureReference procedure, StoredProcedureBody body) {
+			throw new NotImplementedException();
+		}
+
+		string IDBTraits.GetViewBody(Func<DbCommand> commandCreator, string name) {
+			throw new NotImplementedException();
+		}
+
+		ColumnOptions IDBTraits.GetColumnOptions(Func<DbCommand> commandCreator, ColumnReference column) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.RemoveColumn(Func<DbCommand> commandCreator, ColumnReference column) {
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.RemoveColumn(column);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		void IDBTraits.CreateColumn(Func<DbCommand> commandCreator, ColumnDescription description) {
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.CreateColumn(description);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		void IDBTraits.ModifyColumn(Func<DbCommand> commandCreator, ColumnDescription description) {
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.ModifyColumnPostgresStyle(description);
+				Console.WriteLine();
+				Console.WriteLine(command.CommandText);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		private static string GetStringRepresentation(ForeignKeyConstraint.ReferentialAction action) {
+			switch(action) {
+				case ForeignKeyConstraint.ReferentialAction.NoAction:
+					return "NO ACTION";
+				case ForeignKeyConstraint.ReferentialAction.Cascade:
+					return "CASCADE";
+				case ForeignKeyConstraint.ReferentialAction.SetNull:
+					return "SET NULL";
+				case ForeignKeyConstraint.ReferentialAction.SetDefault:
+					return "SET DEFAULT";
+				default:
+					throw new ApplicationException("Unknown referential action");
+			}
+		}
+
+		private void CheckConstraint(Func<DbCommand> commandCreator, ForeignKeyConstraint constraint) {
+			throw new NotImplementedException();
+		}
+
+		private void CheckConstraint(Func<DbCommand> commandCreator, UniqueConstraint constraint) {
+			throw new NotImplementedException();
+		}
+
+		private void CheckConstraint(Func<DbCommand> commandCreator, CheckConstraint constraint) {
+			throw new NotImplementedException();
+		}
+
+		private void CheckConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
+			constraint.Accept(fkc => CheckConstraint(commandCreator, fkc), uc => CheckConstraint(commandCreator, uc), cc => CheckConstraint(commandCreator, cc));
+		}
+
+		public void RemoveConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
+			CheckConstraint(commandCreator, constraint);
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.DropConstraint(constraint);
+				Console.WriteLine();
+				Console.WriteLine(command.CommandText);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		public void CreateConstraint(Func<DbCommand> commandCreator, AbstractConstraint constraint) {
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.CreateConstraint(constraint);
+				Console.WriteLine();
+				Console.WriteLine(command.CommandText);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		public void CreateTable(Func<DbCommand> commandCreator, TableDescription table) {
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.CreateTable(table);
+				Console.WriteLine();
+				Console.WriteLine(command.CommandText);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		private void CheckTable(Func<DbCommand> commandCreator, TableDescription table) {
+			throw new NotImplementedException();
+		}
+
+		void IDBTraits.RemoveTable(Func<DbCommand> commandCreator, TableDescription table) {
+			this.CheckTable(commandCreator, table);
+			using(DbCommand command = commandCreator()) {
+				command.CommandText = _SQLQueryManager.DropTable(table.table);
+				Console.WriteLine();
+				Console.WriteLine(command.CommandText);
+				command.ExecuteNonQuery();
+			}
+		}
+
+		bool IDBTraits.IsDDLTransactional {
+			get { return true; }
+		}
+
+	}
+}
diff --git a/Patcher/DB/SQLQueryManager.cs b/Patcher/DB/SQLQueryManager.cs
index 27de17f..91f9218 100644
--- a/Patcher/DB/SQLQueryManager.cs
+++ b/Patcher/DB/SQLQueryManager.cs
@@ -253,6 +253,10 @@ namespace Patcher.DB
 			);
 		}
 
+		private string _ModifyColumnDefinitionPostgresStyle(ColumnDescription description) {
+			throw new NotImplementedException();
+		}
+
 		private string _TableElementList(TableDescription table) {
 			return string.Format(
 				"({0})",
@@ -292,12 +296,16 @@ namespace Patcher.DB
 		{
 			return _AlterTableStatement(column.tableName, _DropColumnDefinition(column));
 		}
-		
+
 		public string ModifyColumnOracleStyle(ColumnDescription description)
 		{
 			return _AlterTableStatement(description.column.tableName, _ModifyColumnDefinitionOracleStyle(description));
 		}
-		
+
+		public string ModifyColumnPostgresStyle(ColumnDescription description) {
+			return _AlterTableStatement(description.column.tableName, _ModifyColumnDefinitionPostgresStyle(description));
+		}
+
 		public string CreateConstraint(AbstractConstraint constraint)
 		{
 			return _AlterTableStatement(constraint.table, _AddTableConstraintDefinition(constraint));
diff --git a/Patcher/Patcher.csproj b/Patcher/Patcher.csproj
index 114e88b..e90bf70 100644
--- a/Patcher/Patcher.csproj
+++ b/Patcher/Patcher.csproj
@@ -31,6 +31,10 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Npgsql, Version=2.0.8.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\ThirdParty\Npgsql\Npgsql.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core">
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
@@ -80,6 +84,7 @@
     <Compile Include="DB\IDBTraits.cs" />
     <Compile Include="DB\OracleDBTraits.cs" />
     <Compile Include="DB\OracleFakeTransactionalDBTraits.cs" />
+    <Compile Include="DB\PostgresDBTraits.cs" />
     <Compile Include="DB\SQLQueryManager.cs" />
     <Compile Include="DB\StoredProcedureBody.cs" />
     <Compile Include="DB\StoredProcedureReference.cs" />