爪哇没有这样的表格：货物：

Question

我在安卓应用程序上遇到了一个奇怪的问题，我没有这样的表例外，但我确信数据库存在。对于一些将我重定向到其他帖子的人，我想补充一点，我正在自己的手机上尝试应用程序，而不是模拟器，这是因为我在这里读了很多关于模拟器上相同问题的问题

任何想法或暗示都将不胜感激

带有错误的活动代码：

...

public class chartView extends Activity{
    Button editbtm;
    Button cleanbtm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chart_layout);  
        editbtm = (Button) findViewById(R.id.editBasketbtm);
        cleanbtm = (Button) findViewById(R.id.cleanBasketbtm);
        //fletch all goods that should be presented on the text View
        dbAdapter goodsfletcher = new dbAdapter(chartView.this); 
    //  goodsfletcher.createGoodsTable();
        goodsfletcher.open();
        ...

dbADapter类的代码：

public class dbAdapter {

    public static final String KEY_ARTI = "ARTI";
    public static final String KEY_PROV = "PROV";
    public static final String KEY_CODART = "CODART";
    public static final String KEY_PRECBOL ="PRECBOL";
    public static final String KEY_QUANT ="QUANT";

    private static final String TAG = "DbAdapter";
    private DatabaseHelper mDbHelper;
    private SQLiteDatabase mDb;


    private static final String DATABASE_CREATE = "create table goods ( CODART VARCHAR(10) primary key, ARTI varchar(50) not null, PROV varchar(15) not null, PRECBOL FLOAT(6,2) not null, QUANT int not null);";

    private static final String DATABASE_NAME = "ketanoBase";
    private static final String DATABASE_TABLE = "goods";
    private static final int DATABASE_VERSION = 1;

    private final Context mCtx;

    private static class DatabaseHelper extends SQLiteOpenHelper {

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

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(DATABASE_CREATE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                    + newVersion + ", which will destroy all old data");
            db.execSQL("DROP TABLE IF EXISTS goods");
            onCreate(db);
        }
    }


    public dbAdapter(Context ctx) {
        this.mCtx = ctx;
    }


    public dbAdapter open() throws SQLException {
        mDbHelper = new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        mDbHelper.close();
    }



    public void addĜood(String code, String title, String source, String quantity, String price  ) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_ARTI, title);
        initialValues.put(KEY_CODART, code);
        initialValues.put(KEY_PROV, source);
        initialValues.put(KEY_PRECBOL, price);
        initialValues.put(KEY_QUANT, quantity);
        mDb.insert(DATABASE_TABLE, code, initialValues);

    }


    public boolean deleteGood(long rowId) {

        return mDb.delete(DATABASE_TABLE, KEY_CODART + "=" + rowId, null) > 0;
    }

    public void eraseGoods(){
        String sql = "drop table if exists goods";
        mDb.execSQL(sql);
    }


    public Cursor fetchAllGoods() {

        return mDb.query(DATABASE_TABLE, new String[] {KEY_CODART, KEY_ARTI,
                KEY_PROV, KEY_PRECBOL, KEY_QUANT}, null, null, null, null, null);
    }

    public Cursor fetchGood(long rowId) throws SQLException {

        Cursor mCursor =

                mDb.query(true, DATABASE_TABLE, new String[] {KEY_CODART,
                        KEY_ARTI, KEY_PROV,KEY_PRECBOL, KEY_QUANT}, KEY_CODART + "=" + rowId, null,
                        null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;

    }


    public boolean updateGood(long rowId, String quantity) {
        ContentValues args = new ContentValues();

        args.put(KEY_QUANT,quantity);

        return mDb.update(DATABASE_TABLE, args, KEY_CODART + "=" + rowId, null) > 0;
    }
}

日志记录错误：

03-14 09:52:05.668: W/KeyCharacterMap(30808): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
03-14 09:52:06.384: D/AndroidRuntime(30808): Shutting down VM
03-14 09:52:06.384: W/dalvikvm(30808): threadid=1: thread exiting with uncaught exception (group=0x40018560)
03-14 09:52:06.394: E/AndroidRuntime(30808): FATAL EXCEPTION: main
03-14 09:52:06.394: E/AndroidRuntime(30808): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.remotedata.firstapp/com.remotedata.firstapp.chartView}: 安卓.database.sqlite.SQLiteException: no such table: goods: , while compiling: SELECT CODART, ARTI, PROV, PRECBOL, QUANT FROM goods
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread.access$1500(ActivityThread.java:123)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.os.Handler.dispatchMessage(Handler.java:99)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.os.Looper.loop(Looper.java:130)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread.main(ActivityThread.java:3835)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at java.lang.reflect.Method.invokeNative(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at java.lang.reflect.Method.invoke(Method.java:507)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:622)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at dalvik.system.NativeStart.main(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808): Caused by: 安卓.database.sqlite.SQLiteException: no such table: goods: , while compiling: SELECT CODART, ARTI, PROV, PRECBOL, QUANT FROM goods
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at com.remotedata.firstapp.dbAdapter.fetchAllGoods(dbAdapter.java:138)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at com.remotedata.firstapp.chartView.onCreate(chartView.java:31)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-14 09:52:06.394: E/AndroidRuntime(30808):    at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
03-14 09:52:06.394: E/AndroidRuntime(30808):    ... 11 more

Answer 1

我相信数据库文件存在，但表不存在，正如错误所说。您是否尝试过删除数据库文件并重新运行？由于文件存在，DatabaseHelper。不会调用onCreate（）。只有当文件不存在并且创建了新数据库时，才会调用它