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lydonchandra/TestSpatialite.cs

Created October 5, 2015 04:59
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load mod_spatialite using c# and System.Data.SQLite
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TestSpatialite.cs
using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace TestSpatialite
{
class Program
{
public static string getSqliteV3ConnectionString( string sqlitePath)
{
//Default Timeout is in seconds, useful for when sqlite is locked,
//exception is returned after 1 second, default is 30 seconds.
return "Data source=" + sqlitePath + "; Version = 3; Default Timeout = 3;";
}
static bool is64bitProcess()
{
return ( IntPtr.Size == 8);
}
static bool is32bitProcess()
{
return ( IntPtr.Size == 4);
}
static void Main( string[] args)
{
string mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-amd64" ;
if (is64bitProcess())
{
Console.WriteLine( "64bit process");
mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-amd64" ;
}
else if(is32bitProcess())
{
Console.WriteLine( "32bit process");
mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-x86" ;
}
//using relative path, cannot use absolute path, dll load will fail
//string mod_spatialite_dllPath = @"mod_spatialite-4.3.0a-win-amd64\mod_spatialite";
string path = Environment.GetEnvironmentVariable("Path" , EnvironmentVariableTarget.Machine) + ";" + mod_spatialite_folderPath;
Environment.SetEnvironmentVariable("Path" , path, EnvironmentVariableTarget.Process);
string sqlitePath = "db.sqlite";
string sqliteConnectionString = getSqliteV3ConnectionString(sqlitePath);
System.Reflection. Assembly[] arAssemblies = System.AppDomain.CurrentDomain.GetAssemblies();
using ( var sqliteConnection = new SQLiteConnection(sqliteConnectionString))
{
sqliteConnection.Open();
Console.WriteLine( "Load-ing mod_spatialite");
string mod_spatialite_dllPath = mod_spatialite_folderPath + @"\mod_spatialite" ;
sqliteConnection.LoadExtension(mod_spatialite_dllPath);
Console.WriteLine( "Load-ed mod_spatialite");
//bool sqliteExceptionThrown = false;
//try
//{
// sqliteConnection.Execute("update table set column1 = 1;");
//}
//catch (System.Data.SQLite.SQLiteException sqliteException)
//{
// sqliteExceptionThrown = true;
//}
//}
}
Console.ReadLine();
}
}
}
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