Fix database update crash when Dao object changed

data/src/main/java/org/cryptomator/data/db/Sql.java

@@ -1,6 +1,7 @@
 package org.cryptomator.data.db;
 
 import android.content.ContentValues;
+import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 
 import org.greenrobot.greendao.database.Database;
@@ -49,6 +50,10 @@ class Sql {
 		return new SqlUpdateBuilder(tableName);
 	}
 
+	public static SqlQueryBuilder query(String table) {
+		return new SqlQueryBuilder(table);
+	}
+
 	public static Criterion eq(final String value) {
 		return (column, whereClause, whereArgs) -> {
 			whereClause.append('"').append(column).append("\" = ?");
@@ -91,6 +96,56 @@ class Sql {
 		void appendTo(String column, StringBuilder whereClause, List<String> whereArgs);
 	}
 
+	public static class SqlQueryBuilder {
+
+		private final String tableName;
+		private final StringBuilder whereClause = new StringBuilder();
+		private final List<String> whereArgs = new ArrayList<>();
+
+		private List<String> columns = new ArrayList<>();
+		private String groupBy;
+		private String having;
+		private String limit;
+
+		public SqlQueryBuilder(String tableName) {
+			this.tableName = tableName;
+		}
+
+		public SqlQueryBuilder columns(List<String> columns) {
+			this.columns = columns;
+			return this;
+		}
+
+		public SqlQueryBuilder where(String column, Criterion criterion) {
+			if (whereClause.length() > 0) {
+				whereClause.append(" AND ");
+			}
+			criterion.appendTo(column, whereClause, whereArgs);
+			return this;
+		}
+
+		public SqlQueryBuilder groupBy(String groupBy) {
+			this.groupBy = groupBy;
+			return this;
+		}
+
+		public SqlQueryBuilder having(String having) {
+			this.having = having;
+			return this;
+		}
+
+		public SqlQueryBuilder limit(String limit) {
+			this.limit = limit;
+			return this;
+		}
+
+		public Cursor executeOn(Database wrapped) {
+			SQLiteDatabase db = unwrap(wrapped);
+			return db.query(tableName, columns.toArray(new String[columns.size()]), whereClause.toString(), whereArgs.toArray(new String[whereArgs.size()]), groupBy, having, limit);
+		}
+
+	}
+
 	public static class SqlUpdateBuilder {
 
 		private final String tableName;

data/src/main/java/org/cryptomator/data/db/Upgrade2To3.kt

@@ -2,10 +2,8 @@ package org.cryptomator.data.db
 
 import android.content.Context
 import android.content.SharedPreferences
-import org.cryptomator.data.db.entities.CloudEntityDao
 import org.cryptomator.util.crypto.CredentialCryptor
 import org.greenrobot.greendao.database.Database
-import org.greenrobot.greendao.internal.DaoConfig
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -13,16 +11,23 @@ import javax.inject.Singleton
 internal class Upgrade2To3 @Inject constructor(private val context: Context) : DatabaseUpgrade(2, 3) {
 
 	override fun internalApplyTo(db: Database, origin: Int) {
-		val clouds = CloudEntityDao(DaoConfig(db, CloudEntityDao::class.java)).loadAll()
 		db.beginTransaction()
 		try {
-			clouds.filter { cloud -> cloud.type == "DROPBOX" || cloud.type == "ONEDRIVE" } //
+			Sql.query("CLOUD_ENTITY")
-					.map {
+					.columns(listOf("ACCESS_TOKEN"))
-						Sql.update("CLOUD_ENTITY") //
+					.where("TYPE", Sql.eq("DROPBOX"))
-								.where("TYPE", Sql.eq(it.type)) //
+					.executeOn(db).use {
-								.set("ACCESS_TOKEN", Sql.toString(encrypt(if (it.type == "DROPBOX") it.accessToken else onedriveToken()))) //
+						if(it.moveToFirst()) {
-								.executeOn(db)
+							Sql.update("CLOUD_ENTITY")
+									.set("ACCESS_TOKEN", Sql.toString(encrypt(it.getString(it.getColumnIndex("ACCESS_TOKEN")))))
+									.where("TYPE", Sql.eq("DROPBOX"));
 						}
+					}
+
+			Sql.update("CLOUD_ENTITY")
+					.set("ACCESS_TOKEN", Sql.toString(encrypt(onedriveToken())))
+					.where("TYPE", Sql.eq("ONEDRIVE"));
+
 			db.setTransactionSuccessful()
 		} finally {
 			db.endTransaction()