android - 复制数据库时出错

Question

我使用助手复制数据库没问题。但是由于今天重新格式化了我的电脑并安装了 eclipse，所以我不能再复制数据库了。可能是模拟器的 sd 卡导致的问题。这是原木猫说的。

07-23 14:23:48.875: E/AndroidRuntime(237): Uncaught handler: thread main exiting due to uncaught exception
07-23 14:23:48.885: E/AndroidRuntime(237): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.frux.kfcmobile/com.frux.kfcmobile.KFCmobileActivity}: android.database.sqlite.SQLiteException: no such table: first: , while compiling: SELECT *from first
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.os.Handler.dispatchMessage(Handler.java:99)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.os.Looper.loop(Looper.java:123)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread.main(ActivityThread.java:4363)
07-23 14:23:48.885: E/AndroidRuntime(237): at java.lang.reflect.Method.invokeNative(Native Method)
07-23 14:23:48.885: E/AndroidRuntime(237): at java.lang.reflect.Method.invoke(Method.java:521)
07-23 14:23:48.885: E/AndroidRuntime(237): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-23 14:23:48.885: E/AndroidRuntime(237): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-23 14:23:48.885: E/AndroidRuntime(237): at dalvik.system.NativeStart.main(Native Method)
07-23 14:23:48.885: E/AndroidRuntime(237): Caused by: android.database.sqlite.SQLiteException: no such table: first: , while compiling: SELECT *from first
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteProgram.native_compile(Native Method)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteProgram.compile(SQLiteProgram.java:110)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:59)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:49)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1220)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1193)
07-23 14:23:48.885: E/AndroidRuntime(237): at com.frux.kfcmobile.KFCmobileActivity.onCreate(KFCmobileActivity.java:42)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-23 14:23:48.885: E/AndroidRuntime(237): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)

这是我的 DBHelper

公共(public)类 DatabaseHelper 扩展了 SQLiteOpenHelper{

private static String DB_PATH = "/data/data/com.frux.kfcmobile/databases/";
private static String DB_NAME = "database";
private SQLiteDatabase myDataBase; 
private final Context myContext;
private static final int DATABASE_VERSION = 1;


public DatabaseHelper(Context context) {
    // TODO Auto-generated constructor stub
    super(context, DB_NAME, null, DATABASE_VERSION);
    this.myContext = context;


}
 public void createDataBase() throws IOException{

        boolean dbExist = checkDataBase();

        if(dbExist){
            //do nothing - database already exist
            this.getWritableDatabase();
            this.close();
        }else{

            //By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
            this.getReadableDatabase();
            this.close();
            try {

                copyDataBase();

            } catch (IOException e) {

            //throw new Error("Error copying database message");

            }
        }

    }


 private boolean checkDataBase(){

        SQLiteDatabase checkDB = null;

        try{
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

        }catch(SQLiteException e){

            //database does't exist yet.

        }

        if(checkDB != null){

            checkDB.close();

        }

        return checkDB != null ? true : false;
    }



 private void copyDataBase() throws IOException{

        //Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DB_NAME);

        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;

        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);

        //transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }

        //Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();

    }



 public void openDataBase() throws SQLException{

        //Open the database
        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

    }

    @Override
    public synchronized void close() {

            if(myDataBase != null)
                myDataBase.close();

            super.close();

    }

    @Override
    public void onCreate(SQLiteDatabase db) {


    }





    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {


    }

Answer 1

关注下一行，不要忘记添加 .sqlite 扩展名:

private static String DB_NAME = "wfbos.sqlite";

它对我有用。