Question

我正在尝试将byte[]插入SQLite数据库中，但出现NOT NULL constraint failed错误。我在插入和byte[] toString() => [B@e9e5fac和byte[] length=> 32之前检查了值，因此肯定不是null。

这是我的数据库表定义：

 public static final String TABLE_USER_BLOB_STORE = "user_blob_store";
    public static final String USER_BLOB_ID = "_id";
    public static final String USER_BLOB_USER_ID = "user_id";
    public static final String USER_BLOB = "user_blob";


    public static final String[] ALL_COLUMNS_USER_BLOB_STORE = {
            USER_BLOB_ID, USER_BLOB_USER_ID, BLOB_STORE};


    private static final String TABLE_CREATE_USER_BLOB_STORE =
            "CREATE TABLE " + TABLE_USER_BLOB_STORE + " (" +
                    USER_BLOB_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                    USER_BLOB_USER_ID + " INTEGER NOT NULL," +
                    USER_BLOB + " BLOB NOT NULL" +
                    ")";

这是插入方法：

public void insertUserBlob(int userId, byte[] userBlob, Context context) {
    Log.d("userBlob","string value => " + userBlob.toString()); // [B@e9e5fac
    Log.d("userBlob","length => " + userBlob.length); // 32
    ContentValues setValues = new ContentValues();
    setValues.put(DBOpenHelper.USER_BLOB_USER_ID , userId);
    setValues.put(DBOpenHelper.USER_BLOB , userBlob);

    Uri setUri = context.getContentResolver().insert(MyProvider.CONTENT_URI_USER_BLOB, setValues);
}

Answer 1

我可以用这种方法插入

public long createBLB(int userId, byte[] userBlob)
{
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_DIALOGID, userId);
    values.put(USER_BLOB, userBlob);

    long transaction = db.insert(TABLE_BLBS, null, values);

    return transaction;
}

仅作为示例：

    String string = "byte";
    byte[] result = new byte[100];
    System.arraycopy(string.getBytes(), 0, result, 100 - string.length(), string.length());

    DatabaseHelper db = new DatabaseHelper(getApplicationContext());
    long t = db.createBLB(1, result);

Android-SQLite插入byte []因违反NOT NULL约束而失败

1 个答案: