SQLite + SpatiaLite problems

Question

I'm trying to access a SpatiaLite from C# using System.Data.SQLite provider. When I try to load the SpatiaLite extension, I always get the

System.Data.SQLite.SQLiteException: SQLite error
The specified module could not be found.

error, even though the spatialite's dll has been copied to the bin directory. I even tried specifying the absolute path to the dll, but to no avail.

Here's the code:

string connectionString = @"Data Source=D:\MyStuff\projects\OsmUtils\trunk\Data\Samples\DB\osm.sqlite";
using (SQLiteConnection connection = new SQLiteConnection (connectionString))
{
    connection.Open();

    using (SQLiteCommand command = connection.CreateCommand())
    {
        command.CommandText = @"SELECT load_extension('libspatialite-1.dll');";
        command.ExecuteScalar();
    }
    ...

From this link I get the impression this should work.

Thanks in advance

Architect

Answer 1

Well thanks to sqlite3.exe command line tool, I've found out that there are some additional DLLs needed for this to run:

• libproj-0.dll
• libgeos-3-1-1.dll
• libgeos_c-1.dll

You can find these on SpatiaLite's download page. Just copy them to the bin directory.

UPDATE: one additional dll needed is libiconv2.dll

Architect

copy to bin directory of the application or to the system folder? I can't get it work..any clues? – Marlborough

@Marlborough from what I remember, I added them as files to the C# project and then set their properties to "Copy if newer". So yes, they are in the bin directory of the application. – Architect

Answer 2

I had the exact same problem in Java. I called System.load() for all the dependent DLLs and everything worked like a champ!

• libproj-0.dll
• libgeos-3-1-1.dll
• libgeos_c-1.dll
• libiconv2.dll
• libcharset1.dll

Coessential