Sql – ASP.NET 2.0 Application with a Sqlite Backend on Mono

apacheasp.netmonosqlite

I have an extensive ASP.NET Sqlite driven application that will run through Apache with the help of Mono. For testing purposes, I created an application that has two textboxes and a button. When the textboxes are filled with text and the button is executed, a Sqlite table will receive the text within the textboxes. This test application works in Visual Studio.

I published the test application and placed it on the apache server. The Sqlite .db file sits in the bin folder, and my connection string points directly to this folder. When I run the application, the textboxes and button show up, but when I press the button I receive the following error:

Server Error in '/' Application
System.Data.SQLite.DLL
Description: HTTP 500. Error processing request.

Stack Trace:

System.DllNotFoundException: System.Data.SQLite.DLL at (wrapper managed-to-native) System.Data.SQLite.UnsafeNativeMethods:sqlite3_open_interop (byte[],int,intptr&) at System.Data.SQLite.SQLite3.Open (System.String strFilename, SQLiteOpenFlagsEnum flags, Int32 maxPoolSize, Boolean usePool) [0x00000]

at System.Data.SQLite.SQLiteConnection.Open () [0x00000] at WebApplication1._Default.ExecuteQuery (System.String txtQuery) [0x00000] at WebApplication1._Default.Button1_Click (System.Object sender, System.EventArgs e) [0x00000]

at System.Web.UI.WebControls.Button.OnClick (System.EventArgs e) [0x00000] at System.Web.UI.WebControls.Button.RaisePostBackEvent (System.String eventArgument) [0x00000] at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent (System.String eventArgument) [0x00000]

at System.Web.UI.Page.RaisePostBackEvent (IPostBackEventHandler sourceControl, System.String eventArgument) [0x00000] at System.Web.UI.Page.RaisePostBackEvents () [0x00000] at System.Web.UI.Page.ProcessRaiseEvents () [0x00000]

at System.Web.UI.Page.InternalProcessRequest () [0x00000] at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000]

The system.data.sqlite.dll file is actually in the bin with the sqlite .db file. Does anyone know how to resolve this error?

Thank you,

DFM

Best Answer

This managed version of the ADO.NET provider for SQLite requires the native sqlite3.dll or Linux shared library from http://www.sqlite.org It looks like the dll is missing: "DllNotFoundException"

Related Solutions

Sql – How to list the tables in a SQLite database file that was opened with ATTACH

There are a few steps to see the tables in an SQLite database:

List the tables in your database:
```
.tables
```
List how the table looks:
```
.schema tablename
```
Print the entire table:
```
SELECT * FROM tablename;
```
List all of the available SQLite prompt commands:
```
.help
```

.net – ASP.NET Web Site or ASP.NET Web Application

Website:

The Web Site project is compiled on the fly. You end up with a lot more DLL files, which can be a pain. It also gives problems when you have pages or controls in one directory that need to reference pages and controls in another directory since the other directory may not be compiled into the code yet. Another problem can be in publishing.

If Visual Studio isn't told to re-use the same names constantly, it will come up with new names for the DLL files generated by pages all the time. That can lead to having several close copies of DLL files containing the same class name, which will generate plenty of errors. The Web Site project was introduced with Visual Studio 2005, but it has turned out not to be popular.

Web Application:

The Web Application Project was created as an add-in and now exists as part of SP 1 for Visual Studio 2005. The main differences are the Web Application Project was designed to work similarly to the Web projects that shipped with Visual Studio 2003. It will compile the application into a single DLL file at build time. To update the project, it must be recompiled and the DLL file published for changes to occur.

Another nice feature of the Web Application project is it's much easier to exclude files from the project view. In the Web Site project, each file that you exclude is renamed with an excluded keyword in the filename. In the Web Application Project, the project just keeps track of which files to include/exclude from the project view without renaming them, making things much tidier.

The article ASP.NET 2.0 - Web Site vs Web Application project also gives reasons on why to use one and not the other. Here is an excerpt of it:

You need to migrate large Visual Studio .NET 2003 applications to VS 2005? use the Web Application project.

You want to open and edit any directory as a Web project without creating a project file? use Web Site project.

You need to add pre-build and post-build steps during compilation? use Web Application project.

You need to build a Web application using multiple Web projects? use the Web Application project.

You want to generate one assembly for each page? use the Web Site project.

You prefer dynamic compilation and working on pages without building entire site on each page view? use Web Site project.

You prefer single-page code model to code-behind model? use Web Site project.

Web Application Projects versus Web Site Projects (MSDN) explains the differences between the web site and web application projects. Also, it discusses the configuration to be made in Visual Studio.

Related Topic

ASP.NET mvc on mono 2.2