Question

我有本地sqlite数据库的android应用程序，但我有重复行的问题。每当我启动应用程序时，都会向db添加项目，但是那里已经存在一些具有相同ID的项目。问题是我无法更新/重写具有相同ID的行。这是我的db：link

声明：

// Database Name
private static final String DATABASE_NAME = "foodsDB";

// Contacts table name
private static final String TABLE_FOODS = "tableFoods";

// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_FOODNAME = "food_name";
private static final String KEY_ALERGEN_NO = "alergen_numbers";
private static final String KEY_DATE = "date";
private static final String KEY_FOOD_NUMBER = "food_number";

DB create table：

  // Creating Table
@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_FOODS_TABLE = "CREATE TABLE " + TABLE_FOODS + "("
            + KEY_ID + " TEXT,"  + KEY_FOODNAME + " TEXT,"
            + KEY_ALERGEN_NO + " TEXT," + KEY_DATE + " TEXT," + KEY_FOOD_NUMBER + " INTEGER"+")";
    db.execSQL(CREATE_FOODS_TABLE);
}

数据库插入：

 // Adding new food
void addFood(FoodsDB food) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_ID, food.getID());
    values.put(KEY_FOODNAME, food.getFoodName());
    values.put(KEY_ALERGEN_NO, food.getAlergenyNumbers());
    values.put(KEY_DATE,food.getDate());
    values.put(KEY_FOOD_NUMBER,food.getFoodNumber());

    db.beginTransaction();
    try {
        long rowId = db.insertOrThrow(TABLE_FOODS, null, values);
        if (rowId == -1) {
            // insertion failed
            String whereClause = KEY_DATE;
            //String[] whereArgs = new String[] {values.getAsString(KEY_DATE)};
            db.update(TABLE_FOODS, values, whereClause, null);
        }
        db.setTransactionSuccessful();
    } finally {
        db.endTransaction();
    }
    db.close(); // Closing database connection
}

知道为什么我在DB中有更多具有相同ID的行？我也尝试将id设置为主键，但这不起作用。

sqlite数据库中的重复行

0 个答案: