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gabriel |
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package com.cesams.twogetskills.inconcert.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.inconcert.Constants;
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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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gabriel |
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).allowMainThreadQueries().addMigrations(MIGRATION_1_2).fallbackToDestructiveMigration().addMigrations(MIGRATION_2_3).fallbackToDestructiveMigration()
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gabriel |
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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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gabriel |
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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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gabriel |
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gabriel |
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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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database.execSQL("CREATE TABLE `learning_config` (`id` INTEGER NOT NULL, "
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+ "`title` TEXT,`now` TEXT, PRIMARY KEY(`id`))");
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}
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};
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gabriel |
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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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}
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