C# Db Class Generator

Author: Dave
Date: 10.10.12 - 8:28am

Download: DbClassGen.zip

Needed this for a small project so thought i would share.

Sometimes you want to generate C# classes that mirror the data types used in a database table. You also want an easy way to load all of the class members from a data base record. This is a nice way to access members because you get intellisense when accessing them, and dont have to manually cast everything from the data reader object by hand everytime you want to use it.

For this task i created a small class generator that allows you to select the target database and tables you want to access.

After the classes are generated, you query the table through an autogenerated access function.

this does not handle joins yet. A more generic way to load data that contains any number of fields would be something like this:
public class CMyClass
        public Dictionary<string,string>Field = new Dictionary<string,string>();

        public void LoadRecord(MySqlDataReader r){

            DataTable schemaTable = r.GetSchemaTable();
            foreach (DataRow row in schemaTable.Rows) {
                string column = row["ColumnName"].ToString();
                string value = r[column].ToString();

                if (value == "System.Byte[]") value = ByteToString((byte[])r[column]);
                Field.Add(column, value);    

When I get a little more time, I will combine these two techniques so that if unexpected fields are encountered as from a join, the overflow unrecgonized fields will be added to a Dictionary so they can at least be accessed as string values. Not perfect but workable and easy.

Ok I was able to use a combination of both techniques. After some benchmarking, I found that the code below seems to be the quickest way to access unknown members. In the initilization function, you call GetSchemaTable once. If you encounter ambiguous column names, you auto rename subsequent ones columnName_1.
public object GetRaw(string field){
     if(Schema.ContainsKey(field)) return RawValues[Schema[field]];
     return new object();
public Ctblmsgs(IDataReader r, Dictionary<string, int> schema)
     Schema = schema;
     RawValues = new object[r.FieldCount];

Comments: (2)

On 02.20.18 - 8:19am Jerhill wrote:
Hey, it didnt work out of the box. The exe was crashing due to a null pointer exception. When I opened the source code, the Visual Studio project was missing the reference to Mysql.Data so I had to download and link that one myself. After that it worked. Its nice the source code is included as I got it to work with a little effort. Also useful as I want to customize it. Thanks, great job D!

On 08.13.18 - 8:45pm Robert wrote:
Excellent app, Ill have to upload a new one -- its been modified to suit my needs. Updated to support .Net 4.5+ and a more Mysql.Data

Leave Comment:
Email: (not shown)
Message: (Required)
Math Question: 35 + 40 = ? followed by the letter: Z 

About Me
More Blogs
Main Site
C libs for VB6
Console tricks
FireFox temp dir
OCX License
Extract substring
VB6 Console Apps
VB6 Debugger View As Hex tooltips
VB6 - C Share registry data
VB6 Addin Missing Menus
VB6 Class Init Params
VB6 isIn function
Python and VB6
Python pros and cons
download web Dir
vc rand in python
VB6 Language Enhancement
Register .NET as COM
UDT Tricks pt2
Remote Data Extraction
Collection Extender
VB6 FindResource
DirList Single Click
Reset CheckPoint VPN Policy
VB6 BSTR Oddities Explained
SafeArrays in C
BSTR and Variant in C++
Property let optional args
Misc Libs
Enum Named Pipes
Vb6 Collection in C++
VB6 Overloaded Methods
VB6 Syncronous Socket
Simple IPC
VB6 Auto Resize Form Elements
Mach3 Automation
Exit For in While
C# self register ocx
VB6 Class Method Pointers
JS Debugger
Duktape Debug Protocol
QtScript 4 VB
Vb6 Named Args
vb6 Addin Part 2
VB6 Addin vrs Toolbars
OpenFile Dialog MultiSelect
Duktape Example
DukTape JS
VB6 Unsigned
.Net version
TitleBar Height
.NET again
VB6 Self Register OCXs
Query Last 12 Mos
Progid from Interface ID
VB6 to C Array Examples
Human Readable Variant Type
ScriptBasic COM Integration
CodeView Addin
ScriptBasic - Part 2
Script Env
printf override
History Combo
Disable IE
API Hooking in VB6
Addin Hook Events
FastBuild Addin
VB6 MemoryWindow
Link C Obj Files into VB6
Vb6 Standard Dlls
CStr for Pascal
Lazarus Review
asprintf for VS
VB6 GlobalMultiUse
Scintilla in VB6
Dynamic Highlight
WinVerifyTrust, CryptMsgGetParam VB6
MS GLEE Graphing
printf for VB6
C# App Config
Tero DES C# Test
VC 2008 Bit Fields
Speed trap
C# Db Class Generator
VB6 vrs .NET (again)
FireFox Whois Extension
git and vb6
Code Additions
Compiled date to string
C# ListView Sorter
VB6 Wish List
C# Process Injection
C# PE Offset Calculator
VB6 Async Download
Show Desktop
coding philosophy
Code release
Dll Not Found in IDE
Advanced MSScript Control
random tip
Clipart / Vector Art
VB6 Callback from C#
Binary data from VB6 to C#
CSharp and MsScriptControl
HexDumper functions
Js Beautify From VB6 or C#
vb6 FormPos
Inline Asm w VB6
The .NET Fiasco
One rub on computers
Universal extractor