android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 1:解决

android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 1:

这个错误基本上都是sql有问题导致的,仔细检查sql即可;

可以通过以下步骤在Android Studio中导入SQLite数据库文件: 1. 在项目的app文件夹中创建一个名为“assets”的文件夹(如果没有的话)。 2..db文件复制到assets文件夹中。 3. 在您的应用程序中创建一个名为DatabaseHelper的类,在其中添加一个构造函数和一些处理SQLite查询的方法。示例代码: ``` public class DatabaseHelper extends SQLiteOpenHelper { private static final String DB_NAME = "mydb.db"; private static final int DB_VERSION = 1; private SQLiteDatabase myDatabase; private final Context myContext; public DatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); this.myContext = context; } public void createDatabase() throws IOException { boolean dbExist = checkDatabase(); if (!dbExist) { // Create empty database into default system path of your application this.getReadableDatabase(); try { copyDatabase(); } catch (IOException e) { throw new Error("Error copying database"); } } } private boolean checkDatabase() { SQLiteDatabase checkDB = null; try { String myPath = myContext.getFilesDir().getAbsolutePath() + "/databases/" + DB_NAME; checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); } catch (SQLiteException e) { Log.e("checkDatabase", "database does't exist yet."); } if (checkDB != null) { checkDB.close(); } return checkDB != null; } private void copyDatabase() throws IOException { InputStream myInput = myContext.getAssets().open(DB_NAME); String outFileName = myContext.getFilesDir().getAbsolutePath() + "/databases/" + DB_NAME; OutputStream myOutput = new FileOutputStream(outFileName); byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer)) > 0) { myOutput.write(buffer, 0, length); } myOutput.flush(); myOutput.close(); myInput.close(); } public boolean openDatabase() throws SQLException { String myPath = myContext.getFilesDir().getAbsolutePath() + "/databases/" + DB_NAME; myDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE); return myDatabase != null; } @Override public synchronized void close() { if (myDatabase != null) myDatabase.close(); super.close(); } @Override public void onCreate(SQLiteDatabase db) { // You can create tables here } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // You can upgrade tables here } } ``` 4. 在您的活动中,实例化DatabaseHelper并调用createDatabase()方法。此方法将检查数据库是否存在,如果不存在,则将.db文件从资产目录复制到手机存储。以下是一些示例代码: ``` DatabaseHelper myDbHelper = new DatabaseHelper(this); try { myDbHelper.createDatabase(); } catch (IOException e) { throw new Error("Unable to create database"); } myDbHelper.openDatabase(); // Now you can use myDbHelper to query your database myDbHelper.close(); ``` 希望这可以帮助您导入.db文件。
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