房间搜索查询

Question

当我想使用房间查询在我的数据库中搜索用户时，我必须输入全名才能得到结果。如何在数据库中逐字母搜索？

    @Query("SELECT * FROM database WHERE name LIKE :search")
    fun find(search:String?):List<User>

Answer 1

试试

@Query("SELECT * FROM database WHERE name LIKE :search")
fun find(search:String?):List<User>

search = "%Kourosh%";
find(search);

//OR

@Query("SELECT * FROM database WHERE name LIKE '%' || : arg0 || '%'")
fun find(search:String?):List<User>

Answer 2

要以这种方式进行搜索，输入“K”和“Kourosh”，您可以使用如下代码：

这使得单词被逐字母搜索。

public List<Bean> getWords(String englishWord) {
        if(englishWord.equals(""))
            return new ArrayList<Bean>();

        String sql = "SELECT * FROM " + TABLE_NAME +
                " WHERE " + ENGLISH + " LIKE ? ORDER BY " + ENGLISH + " LIMIT 100";

        SQLiteDatabase db = initializer.getReadableDatabase();

        Cursor cursor = null;
        try {
        // this is the main thing

            cursor = db.rawQuery(sql, new String[]{"%" + englishWord + "%"});

            List<Bean> wordList = new ArrayList<Bean>();
            while(cursor.moveToNext()) {
                int id = cursor.getInt(0);
                String english = cursor.getString(1);
                String bangla = cursor.getString(2);
                String status = cursor.getString(3);
                wordList.add(new Bean(id, english, bangla, status));
            }

            return wordList;
        } catch (SQLiteException exception) {
            exception.printStackTrace();
            return null;
        } finally {
            if (cursor != null)
                cursor.close();
        }
    }