Question

我使用数据库加密/解密sqlcipher。现在我写函数巫婆检查这张卡是否存在于表卡中。当我调试我的方法总是返回false。

public boolean checkIfExistCard(String numberCard, String expirationDate) {
    net.sqlcipher.database.SQLiteDatabase db = this.getReadableDatabase(DATABASE_PASSWORD);
    Cursor cursor = db.query(CardColumn.CardEntry.TABLE_CARD,
            new String[]{CardColumn.CardEntry.CARD_NUMBER, CardColumn.CardEntry.CARD_EXPIRATION_DATA},
            CardColumn.CardEntry.CARD_NAME + " = ? and " + CardColumn.CardEntry.CARD_EXPIRATION_DATA + " = ?",
            new String[]{numberCard, expirationDate},
            null, null, null, null);

    if (cursor != null) {
        if (cursor.getCount() > 0) {
            cursor.close();
            db.close();
            return true;
        }
        cursor.close();
        db.close();
    }
    return false;
}

Answer 1

 public boolean checkIfExistCard(String numberCard, String expirationDate) {
    boolean isAvailable=false;
    net.sqlcipher.database.SQLiteDatabase db = this.getReadableDatabase(DATABASE_PASSWORD);
    Cursor cursor = db.query(CardColumn.CardEntry.TABLE_CARD,
            new String[]{CardColumn.CardEntry.CARD_NUMBER, CardColumn.CardEntry.CARD_EXPIRATION_DATA},
            CardColumn.CardEntry.CARD_NAME + " = ? and " + CardColumn.CardEntry.CARD_EXPIRATION_DATA + " = ?",
            new String[]{numberCard, expirationDate},
            null, null, null, null);

    if (cursor != null) {
        if (cursor.getCount() > 0) {

            isAvailable=true;
        }
        else {

            isAvailable=false;
        }
        cursor.close();
        db.close();
    }
    return isAvailable;
}

Answer 2

也许您错过了查询中的空格。在这一行：

CardColumn.CardEntry.CARD_NAME + " = ? and " + CardColumn.CardEntry.CARD_EXPIRATION_DATA + " = ?",

最后一次？标志在＆＃34;之前放置了一个空格。登录。

Answer 3

我解决了我的问题:)我在Cursor中犯了错误应该是CardColumn.CardEntry.CARD_NUMBER而不是CardColumn.CardEntry.CARD_NAME 它起作用：）

    Cursor cursor = db.query(CardColumn.CardEntry.TABLE_CARD,
            new String[]{CardColumn.CardEntry.CARD_NUMBER, CardColumn.CardEntry.CARD_EXPIRATION_DATA},
            CardColumn.CardEntry.CARD_NUMBER + " = ? and " + CardColumn.CardEntry.CARD_EXPIRATION_DATA + " = ?",
            new String[]{numberCard, expirationDate},
            null, null, null, null);

我的函数总是返回false SqlCipher

3 个答案: