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SqlServer package for CatFactory
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CatFactory.SqlServer ==^^==

What Is CatFactory?

CatFactory is a scaffolding engine for .NET Core built with C#.

How does it Works?

The concept behind CatFactory is to import an existing database from SQL Server instance and then to scaffold a target technology.

We can also replace the database from SQL Server instance with an in-memory database.

The flow to import an existing database is:

  1. Create Database Factory
  2. Import Database
  3. Create instance of Project (Entity Framework Core, Dapper, etc)
  4. Build Features (One feature per schema)
  5. Scaffold objects, these methods read all objects from database and create instances for code builders

Currently, the following technologies are supported:

This package is the core for child packages, additional packages have created with this naming convention: CatFactory.PackageName.

  • CatFactory.SqlServer
  • CatFactory.NetCore
  • CatFactory.EntityFrameworkCore
  • CatFactory.AspNetCore
  • CatFactory.Dapper


You can make a donation via PayPal using this link: paypal

Thanks for your help! ==^^==


There will be a lot of improvements for CatFactory on road:

  • Scaffolding Services Layer
  • Dapper Integration for ASP.NET Core
  • MD files
  • Scaffolding C# Client for ASP.NET Web API
  • Scaffolding Unit Tests for ASP.NET Core
  • Scaffolding Integration Tests for ASP.NET Core
  • Scaffolding Angular

Concepts behind CatFactory

Database Type Map

One of things I don't like to get equivalent between SQL data type for CLR is use magic strings, after of review the more "fancy" way to resolve a type equivalence is to have a class that allows to know the equivalence between SQL data type and CLR type.

This concept was created from this matrix: SQL Server Data Type Mappings.

Using this matrix as reference, now CatFactory has a class named DatabaseTypeMap. Database class contains a property with all mappings named DatebaseTypeMaps, so this property is filled by Import feature for SQL Server package.

public class DatabaseTypeMap
    public string DatabaseType { get; set; }

    public bool AllowsLengthInDeclaration { get; set; }

    public bool AllowsPrecInDeclaration { get; set; }

    public bool AllowsScaleInDeclaration { get; set; }

    public string ClrFullNameType { get; set; }

    public bool HasClrFullNameType { get; }

    public string ClrAliasType { get; set; }

    public bool HasClrAliasType { get; }

    public bool AllowClrNullable { get; set; }

    public DbType DbTypeEnum { get; set; }

    public bool IsUserDefined { get; set; }

    public string ParentDatabaseType { get; set; }

    public string Collation { get; set; }

DatabaseTypeMap is the class to represent database type definition, for database instance we need to create a collection of DatabaseTypeMap class to have a matrix to resolve data types.

Suppose there is a class with name DatabaseTypeMapList, this class has a property to get data types. Once we have imported an existing database we can resolve data types:

Resolve without extension methods:

// Get mappings
var dataTypes = database.DatabaseTypeMaps;

// Resolve CLR type
var mapsForString = dataTypes.Where(item => item.ClrType == typeof(string)).ToList();

// Resolve SQL Server type
var mapForVarchar = dataTypes.FirstOrDefault(item => item.DatabaseType == "varchar");

Resolve with extension methods:

// Get database type
var varcharDataType = database.ResolveType("varchar");

// Resolve CLR
var mapForVarchar = varcharDataType.GetClrType();

SQL Server allows to define data types, suppose the database instance has a data type defined by user with name Flag, Flag data type is a bit, bool in C#. Import method retrieve user data types, so in DatabaseTypeMaps collection we can search the parent data type for Flag:

Project Selection

A project selection is a limit to apply settings for objects that match with pattern.

GlobalSelection is the default selection for project, contains a default instance of settings.


Pattern Scope
Sales.OrderHeader Applies for specific object with name Sales.OrderHeader
Sales.* Applies for all objects inside of Sales schema
*.OrderHeader Applies for all objects with name Order with no matter schema
*.* Applies for all objects, this is the global selection


// Apply settings for Project
project.GlobalSelection(settings =>
    settings.ForceOverwrite = true;
    settings.AuditEntity = new AuditEntity("CreationUser", "CreationDateTime", "LastUpdateUser", "LastUpdateDateTime");
    settings.ConcurrencyToken = "Timestamp";

// Apply settings for specific object
project.Select("Sales.OrderHeader", settings =>
    settings.EntitiesWithDataContracts = true;

Event Handlers to Scaffold

In order to provide a more flexible way to scaffold, there are two delegates in CatFactory, one to perform an action before of scaffolding and another one to handle and action after of scaffolding.

// Add event handlers to before and after of scaffold

project.ScaffoldingDefinition += (source, args) =>
    // Add code to perform operations with code builder instance before to create code file

project.ScaffoldedDefinition += (source, args) =>
    // Add code to perform operations after of create code file



This package provides all definitions for CatFactory engine, this is the core for child packages.


CodeFactory: Contains objects to perform code generation.

Diagnostics: Contains objects for diagnostics.

Markup: Contains objects for markup languages.

ObjectOrientedProgramming: Contains objects to modeling definitions: classes, interfaces and enums.

ObjectRelationalMapping: Contains objects for ORM: database, tables, views, scalar functions, table functions and stored procedures.


This packages contains logic to import existing databases from SQL Server instances.

Object Supported
Tables Yes
Views Yes
Scalar Functions Yes
Table Functions Yes
Stored Procedures Yes
Sequences Yes
Extended Properties Yes
Data Types Yes


This package contains code builders and definitions for .NET Core (C#).

Object Members Supported
Struct All Not yet
Interface Inheritance Yes
Interface Events Yes
Interface Properties Yes
Interface Methods Yes
Class Inheritance Yes
Class Events Yes
Class Fields Yes
Class Properties Yes
Class Methods Yes
Enum Options Yes


This package provides scaffolding for Entity Framework Core.

Object Supported
Class for table Yes
Class for view Yes
Class for table function Yes
Class for stored procedure result Not yet
Class for DbContext Yes
Class for entity configuration (table) Yes
Class for entity configuration (view) Yes
Interface for Repository Yes
Class for Repository Yes
Method for scalar function invocation Yes
Method for table function invocation Yes
Method for stored procedure invocation Not yet

Entity Framework Core 2 Feature Chart

Category Feature Supported
Modeling Table splitting Not yet
Modeling Owned types Not yet
Modeling Model-level query filters Not yet
Modeling Database scalar function mapping Not yet
Modeling Self-contained type configuration for code first Not yet
High Performance DbContext pooling Not yet
High Performance Explicitly compiled queries Not yet

New features in EF Core 2.0


This package provides scaffolding for Asp .NET Core.

Feature Supported
Controllers Yes
Requests Yes
Responses Yes
Scaffold Client Not yet
Help Page for Web API Not yet
Unit Tests Not yet
Integration Tests Not yet


This package provides scaffolding for Dapper.

Object Supported
Table Yes
View Yes
Scalar Function Yes
Table Function Yes
Stored Procedures Yes
Sequences Yes


This package provides scaffolding for Type Script.

Object Feature Supported
Interface Inheritance Yes
Interface Fields Yes
Interface Properties Yes
Interface Methods Yes
Class Inheritance Yes
Class Fields Yes
Class Constructors Yes
Class Properties Yes
Class Methods Yes
Module Methods Yes


In 2005 year, I was on my college days and I worked on my final project that included a lot of tables, for those days C# didn't have automatic properties also I worked on store procedures that included a lot of columns, I thought if there was a way to generate all that code because it was repetitive and I wasted time in wrote a lot of code.

In 2006 beggining I've worked for a company and I worked in a prototype to generate code but I didn't have experience and I was a junior developer, so I developed a version in WebForms that didn't allow to save the structure ha,ha,ha that project it was my first project in C# because I came from VB world but I bought a book about Web Services in DotNet and that book used C# code, that was new for me but it got me a very important idea, learn C# and I wrote all first code generation form in C#.

Later, there was a prototype of Entity for SQL, the grandfather of entity framework and I develop a simple ORM because I had table class and other classes such as Column, so after of reviewed Entity for SQL I decided to add the logic to read database and provide a simple way to read the database also of code generation.

In 2008 I built the first ORM based on my code generation engine, in that time it was called F4N1, I worked on an ORM must endure different databases engines such as SQL Server, Sybase and Oracle; so I generated a lot of classes with that engine, for that time the automated unit tests did not exist, I had a webform page that generated that code ha,ha,ha I know it was ugly and crappy but in that time that was my knowledge allowed me.

In 2011 I worked on a demo for a person that worked in his company and that person used another tool for code generation, so my code generation engine wasn't use for his work.

In 2012 I worked for a company needed to rebuilt all system with new technologies (ASP.NET MVC and Entity Framework) so I invested time about MVC and EF learning but as usual, there isn't time for that ha,ha,ha and again my code generation it wasn't considered for that upgrade =(

In 2014, I thought to make a nuget package to my code generation but in those days I didn't have the focus to accomplish that feature and always I used my code generation as a private tool, in some cases I shared my tool with some coworkers to generate code and reduce the time for code writing.

In 2016, I decided to create a nuget package and integrates with EF Core, using all experience from 10 years ago :D Please remember that from the beginning I was continuing improve the way of code generation, my first code was a crap but with the timeline I've improved the design and naming for objects.

Why I named CatFactory? It was I had a cat, her name was Mindy and that cat had manny kittens (sons), so the basic idea it was the code generation engine generates the code as fast Mindy provided kittens ha,ha,ha


  • The name for this framework it was F4N1 before than CatFactory
  • Framework's name is related to kitties
  • Import logic uses sp_help stored procedure to retrieve the database object's definition, I learned that in my database course at college
  • Load mapping for entities with MEF, it's inspired in "OdeToCode" (Scott Allen) article for Entity Framework 6.x
  • Expose all settings in one class inside of project's definition is inspired on DevExpress settings for Web controls (Web Forms)
  • There are three alpha versions for CatFactory as reference for Street Fighter Alpha fighting game.
  • There will be two beta versions for CatFactory: Sun and Moon as reference for characters from The King of Fighters game: Kusanagi Kyo and Yagami Iori.

Quick Starts

Scaffolding View Models with CatFactory

Scaffolding Entity Framework Core 2 with CatFactory

Scaffolding Dapper with CatFactory

Scaffolding ASP.NET Core 2 with CatFactory

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