我想添加三个新表到我现有的sqlite数据库，我遇到了成功升级后不更新数据库版本的问题。下面是运行DatabaseHelper：成功升级后Android升级数据库不更新数据库版本

private static class DatabaseHelper extends SQLiteOpenHelper {

public DatabaseHelper(Context context, String name, CursorFactory factory, int version) {

super(context, name, factory, version);

}

@Override

public void onCreate(SQLiteDatabase db) {

Log.w(TAG, "Current db version is " + db.getVersion());

db.execSQL(ORIGINAL_DATABASE_CREATE);

}

@Override

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

Log.w(TAG, "Old Version " + oldVersion + " New Version " + newVersion + " db.getVersion is " + db.getVersion());

db.execSQL(NEW_TABLE_1_DATABASE_CREATE);

db.execSQL(NEW_TABLE_2_DATABASE_CREATE);

db.execSQL(NEW_TABLE_3_DATABASE_CREATE);

db.setVersion(newVersion);

Log.w(TAG, "Version after onUpgrade is " + db.getVersion());

}

}

下面是我的open()函数： ​​3210

下面是我的close()函数：

public void close() {

mDb.close();

mDbHelper.close();

}

第一所以会发生什么运行更高DATABASE_VERSION是第一个onUpgrade日志读出： 旧版本1新版本2 db.getVersion是1

第二个日志是：onUpgrade后 版本是2

但是当数据库被再次访问onUpgrade是跑不更新数据库的版本号，并通过onUpgrade与第一日志中运行后onUpgrade阅读： 旧版本1新版本2 db.getVersion是1

然后，应用程序崩溃，因为它尝试创建一个已经存在的表。

我试过在onUpgrade中也没有手动设置数据库版本。这也没有用。我也尝试通过运行更新版本号...

db.execSQL("PRAGMA user_version = " + newVersion);

...在onUpgrade结尾处。

编辑：

每Aswin Kumar的建议，我已经改变了我onUpgrade到备份我现有的表并删除所有表，然后重新创建它们。这并没有解决我的版本问题。下面是我的onUpgrade和的onCreate：

@Override

public void onCreate(SQLiteDatabase db) {

Log.w(TAG, "Current db version is " + db.getVersion());

db.execSQL(ORIGINAL_DATABASE_CREATE);

db.execSQL(NEW_TABLE_1_DATABASE_CREATE);

db.execSQL(NEW_TABLE_2_DATABASE_CREATE);

db.execSQL(NEW_TABLE_3_DATABASE_CREATE);

}

@Override

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

Log.w(TAG, "Old Version " + oldVersion + " New Version " + newVersion + " db.getVersion is " + db.getVersion());

mOldDbContents = backupTables(db);

db.execSQL("DROP TABLE IF EXISTS " + ORIGINAL_DATABASE_CREATE);

db.execSQL("DROP TABLE IF EXISTS " + NEW_TABLE_1_DATABASE_CREATE);

db.execSQL("DROP TABLE IF EXISTS " + NEW_TABLE_2_DATABASE_CREATE);

db.execSQL("DROP TABLE IF EXISTS " + NEW_TABLE_3_DATABASE_CREATE);

onCreate(db);

}

下面是我用它来创建表的sqlite的语句：

private static final String ORIGINAL_DATABASE_CREATE = "create table " + VEHICLE_EXPENSE_TABLE_NAME +

" (" + KEY_ROW_ID + " integer primary key autoincrement, " +

KEY_UNIX_DATE + " integer, " +

KEY_DATE + " not null default current_date, " +

KEY_TIME + " not null default current_time, " +

KEY_DESCRIPTION + " text, " +

KEY_START_MILE + " integer, " +

KEY_END_MILE + " integer, " +

KEY_MILES + " text, " +

KEY_AMOUNT + " text, "

+ KEY_PARTY_ID + " integer)";

private static final String NEW_TABLE_1_DATABASE_CREATE = "CREATE TABLE " + PURCHASE_HISTORY_TABLE_NAME +

"(" + HISTORY_ORDER_ID_COL + " TEXT PRIMARY KEY, " +

HISTORY_STATE_COL + " INTEGER, " +

HISTORY_PRODUCT_ID_COL + " TEXT, " +

HISTORY_DEVELOPER_PAYLOAD_COL + " TEXT, " +

HISTORY_PURCHASE_TIME_COL + " INTEGER)";

private static final String NEW_TABLE_2_DATABASE_CREATE = "CREATE TABLE " + PURCHASED_ITEMS_TABLE_NAME +

"(" + PURCHASED_PRODUCT_ID_COL + " TEXT PRIMARY KEY, " +

PURCHASED_QUANTITY_COL + " INTEGER)";

private static final String NEW_TABLE_3_DATABASE_CREATE = "CREATE TABLE " + TRIAL_LIMIT_TABLE_NAME +

"(" + TRIAL_PRODUCT_ID_COL + " TEXT PRIMARY KEY, " +

TRIAL_PRODUCT_NAME + " TEXT, " +

TRIAL_START_DATE + " INTEGER)";

任何帮助将是巨大的赞赏。

谢谢 凯文

2012-07-27

KevinM