我有一个数据库找不到列的问题

Question

好的，我有一个问题，当我尝试在主代码中添加用户名时，它写为：

E / SQLiteLog：（1）表用户名没有名为KEY_USERNAME的列 E / SQLiteDatabase：插入KEY_USERNAME = tyuiopoiuyt KEY_PASSWORD = uytrtyuio时出错     android.database.sqlite.SQLiteException：表用户名没有名为KEY_USERNAME（代码1）：的列，而在编译时：INSERT INTO Usernames（KEY_USERNAME，KEY_PASSWORD）VALUES（？，？）

我现在将同时添加数据库和Username类，希望能对您有所帮助。

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "UsernameManager";
    private static final String TABLE_USERNAMES = "Usernames";
    private static final String KEY_ID = "id";
    private static final String KEY_USERNAME = "username";
    private static final String KEY_PASSWORD = "password";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }



    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_USERNAME_TABLE = String.format("CREATE TABLE %s (%s INTEGER PRIMARY KEY, %s TEXT, %s TEXT)", TABLE_USERNAMES, KEY_ID, KEY_USERNAME, KEY_PASSWORD);
        db.execSQL(CREATE_USERNAME_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERNAMES);

        onCreate(db);

    }

    void addUsername(Usernames username){
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues cv = new ContentValues();
        cv.put("KEY_PASSWORD", username.getPassword());
        cv.put("KEY_USERNAME", username.getUsername());


        db.insert(TABLE_USERNAMES, null, cv);
        db.close();
    }

    Usernames getUsername(int id){
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE_USERNAMES, new String[] {KEY_ID, KEY_USERNAME, KEY_PASSWORD}, KEY_ID + "=?",
                new String[]{String.valueOf(id)}, null,null,null,null);
        if(cursor != null){
            cursor.moveToFirst();
        }

        Usernames username = new Usernames(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2));

        return username;
    }


    public List<Usernames> getAllUsernames(){
        List<Usernames> usernamesList = new ArrayList<>();

        String selectQuery = String.format("SELECT  * FROM %s", TABLE_USERNAMES);
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        if(cursor.moveToFirst()){
            do {
                Usernames username = new Usernames();
                username.setId(Integer.parseInt(cursor.getString(0)));
                username.setUsername(cursor.getString(1));
                username.setPassword(cursor.getString(2));

                usernamesList.add(username);
            } while ( cursor.moveToNext());
        }

        return usernamesList;
    }

    public int updateUsername(Usernames username){
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues cv = new ContentValues();
        cv.put("KEY_USERNAME", username.getUsername());
        cv.put("KEY_PASSWORD", username.getPassword());

        return db.update(TABLE_USERNAMES, cv, KEY_ID + "=?",
                new String[]{String.valueOf(username.getId())});
    }

    public void deleteUsername(Usernames username){
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TABLE_USERNAMES, KEY_ID + "=?",
                new String[]{String.valueOf(username.getId())});
        db.close();
    }

    public int getUsernameCount(){
        String countQuery = String.format("SELECT  * FROM %s", TABLE_USERNAMES);
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery , null );
        cursor.close();

        return cursor.getCount();
    }
}

这是用户名类

public class Usernames {
    int id;
    String username;
    String password;

    public Usernames(){

    }

    public Usernames(String username, String password){
        this.username = username;
        this.password = password;
    }

    public Usernames(int id, String username, String password){
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}