SQLite データベースで ALTER TABLE を実行し、アプリケーションの更新はすべて順調に進んでいますが、古いバージョンのデータベースをインストールせずに新しい APK を起動すると、新しい列が作成されません! なんで？これは私が使用しているコードです:
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (newVersion >=2) {
db.execSQL("ALTER TABLE Giornate ADD COLUMN note TEXT");
}
}
私のヘルパークラスには、「Giornate」にいくつかのテーブルがあり、「NOTE」フィールドを追加する必要があります
@Override
public void onCreate(SQLiteDatabase db) {
BilancioHelper.db = db;
//tabella giornate
StringBuilder builder = new StringBuilder();
builder.append("CREATE TABLE {0} (");
builder.append("{1} INTEGER PRIMARY KEY AUTOINCREMENT,");
builder.append("{2} TEXT,");
builder.append("{3} REAL DEFAULT 0,");
builder.append("{4} REAL DEFAULT 0,");
builder.append("{5} REAL DEFAULT 0,");
builder.append("{6} INTEGER,"); // E' boolean
builder.append("{7} INTEGER"); // E' boolean
builder.append(");");
db.execSQL(MessageFormat.format(builder.toString(),
GiornateTable.TABLE_NAME, GiornateTable._ID,
GiornateTable.DATA, GiornateTable.ENTRATA,
GiornateTable.USCITA, GiornateTable.BANCA, GiornateTable.RIPOSO, GiornateTable.SPESA));
文字列
public interface GiornateTable extends BaseColumns {
public static final String TABLE_NAME = "Giornate";
public static final String ENTRATA = "entrata";
public static final String DATA = "data";
public static final String USCITA = "uscita";
public static final String BANCA = "banca";
public static final String RIPOSO = "riposo";
public static final String SPESA = "spesa";
public static final String NOTE = "note";
public static final String[] COLUMNS = {_ID, ENTRATA, DATA, USCITA, BANCA, RIPOSO, NOTE};
}
次に、これらのテストを行います。バージョン 1 を起動してから 2 を起動すると、すべてうまくいきます。しかし、2つだけをキャストするとクラッシュします。ログキャット:
08-18 16:54:15.126: E/AndroidRuntime(1258): java.lang.RuntimeException: Unable to start activity ComponentInfo{bilancio.personale/it.della90.bilancio.MainActivity}: java.lang.NullPointerException
08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 08-18 16:54:15.126: E/AndroidRuntime(1258): Android で。 app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.access$600(ActivityThread.java:141) 08-18 16:54 :15.126: E/AndroidRuntime(1258): android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.os.Handler で。 dispatchMessage(Handler.java:99) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.os.Looper.loop(Looper.java:137) 08-18 16:54:15.126: E/ AndroidRuntime(1258): android.app.ActivityThread.main(ActivityThread.java:5041) 08-18 16:54:15.126: E/AndroidRuntime(1258): java.lang.reflect で。Method.invokeNative(ネイティブ メソッド) 08-18 16:54:15.126: E/AndroidRuntime(1258): java.lang.reflect.Method.invoke(Method.java:511) 08-18 16:54:15.126: E /AndroidRuntime(1258): com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 08-18 16:54:15.126: E/AndroidRuntime(1258): com.android.internal. os.ZygoteInit.main(ZygoteInit.java:560) 08-18 16:54:15.126: E/AndroidRuntime(1258): dalvik.system.NativeStart.main(ネイティブ メソッド) 08-18 16:54:15.126: E /AndroidRuntime(1258): 原因: java.lang.NullPointerException 08-18 16:54:15.126: E/AndroidRuntime(1258): at it.della90.bilancio.db.BilancioHelper.onCreate(BilancioHelper.java:38) 08 -18 16:54:15.126: E/AndroidRuntime (1258): android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked (SQLiteOpenHelper.java:252) 08-18 16:54:15.126:E/AndroidRuntime(1258): android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188) 08-18 16:54:15.126: E/AndroidRuntime(1258): it.della90.bilancio.MainActivity.calcolaTotaleRisparmioMese で(MainActivity.java:342) 08-18 16:54:15.126: E/AndroidRuntime (1258): it.della90.bilancio.MainActivity.onCreate (MainActivity.java:112) 08-18 16:54:15.126: E /AndroidRuntime(1258): android.app.Activity.performCreate(Activity.java:5104) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1080) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): . .. 11以上getReadableDatabase(SQLiteOpenHelper.java:188) 08-18 16:54:15.126: E/AndroidRuntime(1258): it.della90.bilancio.MainActivity.calcolaTotaleRisparmioMese(MainActivity.java:342) 08-18 16:54:15.126: E/AndroidRuntime(1258): it.della90.bilancio.MainActivity.onCreate(MainActivity.java:112) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Activity.performCreate(Activity) .java:5104) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-18 16:54:15.126: E/AndroidRuntime(1258) ): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11 もっと見るgetReadableDatabase(SQLiteOpenHelper.java:188) 08-18 16:54:15.126: E/AndroidRuntime(1258): it.della90.bilancio.MainActivity.calcolaTotaleRisparmioMese(MainActivity.java:342) 08-18 16:54:15.126: E/AndroidRuntime(1258): it.della90.bilancio.MainActivity.onCreate(MainActivity.java:112) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Activity.performCreate(Activity) .java:5104) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-18 16:54:15.126: E/AndroidRuntime(1258) ): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11 もっと見るcalcolaTotaleRisparmioMese (MainActivity.java:342) 08-18 16:54:15.126: E/AndroidRuntime (1258): it.della90.bilancio.MainActivity.onCreate (MainActivity.java:112) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Activity.performCreate(Activity.java:5104) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java) :1080) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11以上calcolaTotaleRisparmioMese (MainActivity.java:342) 08-18 16:54:15.126: E/AndroidRuntime (1258): it.della90.bilancio.MainActivity.onCreate (MainActivity.java:112) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Activity.performCreate(Activity.java:5104) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java) :1080) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11以上E/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java) :2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11 もっと見るE/AndroidRuntime(1258): android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-18 16:54:15.126: E/AndroidRuntime(1258): android.app.ActivityThread.performLaunchActivity(ActivityThread.java) :2144) 08-18 16:54:15.126: E/AndroidRuntime(1258): ... 11 もっと見る