Proyectos de Subversion Android Microlearning - Nuevo Interface

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package com.cesams.twogetskills.dao;
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import android.content.Context;
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import androidx.room.Room;
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import androidx.room.migration.Migration;
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import androidx.sqlite.db.SupportSQLiteDatabase;
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import com.cesams.twogetskills.Constants;
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import com.cesams.twogetskills.entity.NotificationCenter;
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public class DatabaseHelper {
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    private static DatabaseHelper _INSTANCE = null;
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    private AppDatabase appDatabase;
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    // other instance variables can be here
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    private DatabaseHelper(Context context) {
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        appDatabase = Room.databaseBuilder(
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                context.getApplicationContext(),
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                AppDatabase.class, Constants.DATABASE_FILENAME
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        ).allowMainThreadQueries().addMigrations(MIGRATION_1_2).fallbackToDestructiveMigration().addMigrations(MIGRATION_2_3).fallbackToDestructiveMigration()
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                .build();
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    };
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    static final Migration MIGRATION_1_2 = new Migration(1, 2) {
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        @Override
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        public void migrate(SupportSQLiteDatabase database) {
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            database.execSQL("CREATE TABLE `tb_notification` (`id` INTEGER NOT NULL, "
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                    + "`title` TEXT,`date` TEXT,`description` TEXT, viewed TEXT, url TEXT, PRIMARY KEY(`id`))");
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN added_on TEXT");
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN updated_on TEXT");
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            database.execSQL("ALTER TABLE `tb_topics`"
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                    + "ADD COLUMN added_on TEXT");
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            database.execSQL("ALTER TABLE `tb_topics`"
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                    + "ADD COLUMN updated_on TEXT");
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        }
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    };
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    static final Migration MIGRATION_2_3 = new Migration(2, 3) {
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        @Override
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        public void migrate(SupportSQLiteDatabase database) {
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN link_comments TEXT");
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN link_comment_add TEXT");
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN total_comments INTEGER");
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            database.execSQL("ALTER TABLE `tb_capsules`"
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                    + "ADD COLUMN total_rating INTEGER");
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        }
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    };
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    public static DatabaseHelper getInstance(Context context) {
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        if (_INSTANCE == null) {
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            _INSTANCE = new DatabaseHelper(context);
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        }
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        return(_INSTANCE);
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    }
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    public AppDatabase getAppDatabase() {
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        return appDatabase;
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    }
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}