Question

    package com.myandroidapp.app.util;

    import android.content.Context;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.util.Log;

    public class DatabaseHandler extends SQLiteOpenHelper {

        private static final int DATABASE_VERSION = 5;
        private static final String DATABASE_NAME = "px.db";

        private static final String TABLE_IDENTITY = "identity";
        private static final String TABLE_DEFAULT_IDENTITY = "default_identity";

        public DatabaseHandler(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            Log.e("TAG", "onCreate");
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.e("TAG", "upGrade");
        }

        @Override
        public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.e("TAG", "downGrade");
        }

        public Cursor getIdentityCard() {

            String query = "SELECT * FROM " + TABLE_IDENTITY;
            return querryDb(query);

        }

        public Cursor getDefaultIdentityCard() {

            String query = "SELECT * FROM " + TABLE_DEFAULT_IDENTITY;
            return querryDb(query);

        }

        private Cursor querryDb(String query) {
            SQLiteDatabase db = this.getReadableDatabase(); /*Error Comes here even if i use this.getWritableDatabase();*/
            Cursor cursor = db.rawQuery(query, null);
            return cursor;
        }

    }

logcat的

04-28 11:13:32.934: E/AndroidRuntime(1325): FATAL EXCEPTION: Thread-10
04-28 11:13:32.934: E/AndroidRuntime(1325): android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 8 to 5: /data/data/com.paytronix.client.android.app.marketplacegrill/databases/px.db
04-28 11:13:32.934: E/AndroidRuntime(1325):     at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:199)
04-28 11:13:32.934: E/AndroidRuntime(1325):     at com.paytronix.client.android.app.marketplacegrill.util.DatabaseHandler.querryDb(DatabaseHandler.java:51)
04-28 11:13:32.934: E/AndroidRuntime(1325):     at com.paytronix.client.android.app.marketplacegrill.util.DatabaseHandler.getIdentityCard(DatabaseHandler.java:39)
04-28 11:13:32.934: E/AndroidRuntime(1325):     at com.paytronix.client.android.app.activity.Main$1.run(Main.java:26)
04-28 11:13:32.934: E/AndroidRuntime(1325):     at java.lang.Thread.run(Thread.java:1019)

问题

我正在获取Android SQLiteException: attempt to write a readonly database: BEGIN EXCLUSIVE when calling this.getWritableDatabase()和android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 8 to 5 when calling this.getReadableDatabase()

场景：我已根据我的手机版2.3.6 GalaxyS2获取了现有应用中的DB文件并将其推送到我应用的数据库文件夹，因此访问{ {1}}文件无论我在pushed DB中使用DATABASE_VERSION，我都会收到相同的错误。

Answer 1

请注意，每次更改数据库版本时，都必须重新创建数据库。

首先，您需要从Database文件夹中删除数据库，然后再次重新创建数据库。

请使用此代码

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  // Drop older table if existed
  db.execSQL("DROP TABLE IF EXISTS " + "Your table name");

  // Create tables again
  onCreate(db);
 }

希望这对你有所帮助!! 如果它不起作用请告诉我，我会尽力帮助你。

this.getReadableDatabase和this.getWritableDatabase（）上的Android SQLiteException

logcat的

问题

1 个答案: