X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=app%2Fsrc%2Fmain%2Fjava%2Fuk%2Fme%2Fnjae%2Fsunshine%2Fdata%2FWeatherDbHelper.java;fp=app%2Fsrc%2Fmain%2Fjava%2Fuk%2Fme%2Fnjae%2Fsunshine%2Fdata%2FWeatherDbHelper.java;h=4c67404cb5d53327a1f81d1b64ebe458e5783fe9;hb=b529b0b07fd94118aff6add8b80ae53947819982;hp=0000000000000000000000000000000000000000;hpb=7860705c1ca10c91c5a2095ace5de79e36fdecfb;p=Sunshine.git

diff --git a/app/src/main/java/uk/me/njae/sunshine/data/WeatherDbHelper.java b/app/src/main/java/uk/me/njae/sunshine/data/WeatherDbHelper.java
new file mode 100644
index 0000000..4c67404
--- /dev/null
+++ b/app/src/main/java/uk/me/njae/sunshine/data/WeatherDbHelper.java
@@ -0,0 +1,79 @@
+package uk.me.njae.sunshine.data;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+import uk.me.njae.sunshine.data.WeatherContract.LocationEntry;
+import uk.me.njae.sunshine.data.WeatherContract.WeatherEntry;
+
+
+/**
+ * Manages a local database for weather data.
+ */
+public class WeatherDbHelper extends SQLiteOpenHelper {
+
+    // If you change the database schema, you must increment the database version.
+    private static final int DATABASE_VERSION = 1;
+
+    public static final String DATABASE_NAME = "weather.db";
+
+    public WeatherDbHelper(Context context) {
+        super(context, DATABASE_NAME, null, DATABASE_VERSION);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase sqLiteDatabase) {
+        // Create a table to hold locations.  A location consists of the string supplied in the
+        // location setting, the city name, and the latitude and longitude
+        final String SQL_CREATE_LOCATION_TABLE = "CREATE TABLE " + LocationEntry.TABLE_NAME + " (" +
+                LocationEntry._ID + " INTEGER PRIMARY KEY," +
+                LocationEntry.COLUMN_LOCATION_SETTING + " TEXT UNIQUE NOT NULL, " +
+                LocationEntry.COLUMN_CITY_NAME + " TEXT NOT NULL, " +
+                LocationEntry.COLUMN_COORD_LAT + " REAL NOT NULL, " +
+                LocationEntry.COLUMN_COORD_LONG + " REAL NOT NULL, " +
+                "UNIQUE (" + LocationEntry.COLUMN_LOCATION_SETTING +") ON CONFLICT IGNORE"+
+                " );";
+
+        final String SQL_CREATE_WEATHER_TABLE = "CREATE TABLE " + WeatherEntry.TABLE_NAME + " (" +
+                // Why AutoIncrement here, and not above?
+                // Unique keys will be auto-generated in either case.  But for weather
+                // forecasting, it's reasonable to assume the user will want information
+                // for a certain date and all dates *following*, so the forecast data
+                // should be sorted accordingly.
+                WeatherEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
+
+                // the ID of the location entry associated with this weather data
+                WeatherEntry.COLUMN_LOC_KEY + " INTEGER NOT NULL, " +
+                WeatherEntry.COLUMN_DATETEXT + " TEXT NOT NULL, " +
+                WeatherEntry.COLUMN_SHORT_DESC + " TEXT NOT NULL, " +
+                WeatherEntry.COLUMN_WEATHER_ID + " INTEGER NOT NULL," +
+
+                WeatherEntry.COLUMN_MIN_TEMP + " REAL NOT NULL, " +
+                WeatherEntry.COLUMN_MAX_TEMP + " REAL NOT NULL, " +
+
+                WeatherEntry.COLUMN_HUMIDITY + " REAL NOT NULL, " +
+                WeatherEntry.COLUMN_PRESSURE + " REAL NOT NULL, " +
+                WeatherEntry.COLUMN_WIND_SPEED + " REAL NOT NULL, " +
+                WeatherEntry.COLUMN_DEGREES + " REAL NOT NULL, " +
+
+                // Set up the location column as a foreign key to location table.
+                " FOREIGN KEY (" + WeatherEntry.COLUMN_LOC_KEY + ") REFERENCES " +
+                LocationEntry.TABLE_NAME + " (" + LocationEntry._ID + "), " +
+
+                // To assure the application have just one weather entry per day
+                // per location, it's created a UNIQUE constraint with REPLACE strategy
+                " UNIQUE (" + WeatherEntry.COLUMN_DATETEXT + ", " +
+                WeatherEntry.COLUMN_LOC_KEY + ") ON CONFLICT REPLACE);";
+
+        sqLiteDatabase.execSQL(SQL_CREATE_LOCATION_TABLE);
+        sqLiteDatabase.execSQL(SQL_CREATE_WEATHER_TABLE);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
+        sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + LocationEntry.TABLE_NAME);
+        sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + WeatherEntry.TABLE_NAME);
+        onCreate(sqLiteDatabase);
+    }
+}