https://github.com/fcaldarelli/sqliteclientforwp

SQLite Client for Windows Phone ( WP7 compatibile )
https://github.com/fcaldarelli/sqliteclientforwp

Last synced: 2 months ago
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SQLite Client for Windows Phone ( WP7 compatibile )

• Host: GitHub
• URL: https://github.com/fcaldarelli/sqliteclientforwp
• Owner: fcaldarelli
• Created: 2014-07-24T17:58:58.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-07-24T19:27:22.000Z (over 10 years ago)
• Last Synced: 2023-03-11T18:12:52.384Z (almost 2 years ago)
• Language: C#
• Size: 1.13 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
SQLite Client For WP

====================

This client use Sqlite Client for Windows Phone (http://sqlitewindowsphone.codeplex.com/releases) rel 2 v.0.6.1

with little changes.

I wrote a Database Wrapper class ( in Classes folder ) that encapsulates some database operations such as copying the .sqlite file from the project to isolated storage.

Pay attention that a file must be created with the same name as the database file with the suffix -journal otherwise the library go in exception.

Changes to default library

==========================

**Add support to DateTime column null value.**

    public DateTime ToDateTime(string dateText)

    {

        switch (dateFormat)

        {

            case SQLiteDateFormats.Ticks:

                return new DateTime(Convert.ToInt64(dateText, CultureInfo.InvariantCulture));

            case SQLiteDateFormats.JulianDay:

                return ToDateTime(Convert.ToDouble(dateText, CultureInfo.InvariantCulture));

            default:

                {

                    if (dateText != null)

                    {

                        return DateTime.ParseExact(dateText, _datetimeFormats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None);

                    }

                    else

                    {

                        return DateTime.MinValue;

                    }

                }

        }

    }

**Add sqlite custom function as gps distance between two positions**

In database wrapper, when open database add custom function:

        private void Open()

        {

            db.Open();

            Sqlite3.sqlite3_create_function(db.SqliteDb, "distanceGPSInKM", 4, Sqlite3.SQLITE_UTF8, null, SQLite_distanceGPSFunc, null, null);

        }

        

Define in database wrapper static method SQLite_distanceGPSFunc

        public static void SQLite_distanceGPSFunc(

            Sqlite3.sqlite3_context ctx, int argc, Sqlite3.Mem[] argv

        )

        {

            // check that all four arguments are non-null

            if (Sqlite3.sqlite3_value_type(argv[0]) == Sqlite3.SQLITE_NULL || Sqlite3.sqlite3_value_type(argv[1]) == Sqlite3.SQLITE_NULL || Sqlite3.sqlite3_value_type(argv[2]) == Sqlite3.SQLITE_NULL || Sqlite3.sqlite3_value_type(argv[3]) == Sqlite3.SQLITE_NULL)

            {

                Sqlite3.sqlite3_result_null(ctx);

                return;

            }

            // get the four argument values

            double lat1 = Sqlite3.sqlite3_value_double(argv[0]);

            double lon1 = Sqlite3.sqlite3_value_double(argv[1]);

            double lat2 = Sqlite3.sqlite3_value_double(argv[2]);

            double lon2 = Sqlite3.sqlite3_value_double(argv[3]);

            // convert lat1 and lat2 into radians now, to avoid doing it twice below

            double lat1rad = DEG2RAD(lat1);

            double lat2rad = DEG2RAD(lat2);

            // apply the spherical law of cosines to our latitudes and longitudes, and set the result appropriately

            // 6378.1 is the approximate radius of the earth in kilometres

            Sqlite3.sqlite3_result_double(ctx, Math.Acos(Math.Sin(lat1rad) * Math.Sin(lat2rad) + Math.Cos(lat1rad) * Math.Cos(lat2rad) * Math.Cos(DEG2RAD(lon2) - DEG2RAD(lon1))) * 6378.1);

        }