Sqlite 数据库增删改查,清除所有

public class PersonDao {
    private SqlHelper sqliteHelper;
    private SQLiteDatabase db;

    public PersonDao(Context context){
        sqliteHelper = new SqlHelper(context);
        db = sqliteHelper.getReadableDatabase();
    }

    //增加的方法
    public void add(String name){
        //? 占位
        ContentValues values = new ContentValues();
        values.put("name",name);
        db.insert("person",null,values);

    }

    //查询
    public List select(){
        //1.sql语句   2.条件的值   Cursor 游标
        Cursor rawQuery = db.rawQuery("select * from person", null);
        List list=new ArrayList<>();
        //rawQuery.moveToNext() 移动到下一行读取
        while (rawQuery.moveToNext()) {
            //得到查询出来的值
            String name = rawQuery.getString(rawQuery.getColumnIndex("name"));
            list.add(name);
        }
        return list;
    }

    //删除
    public void delete(String name){

        db.delete("person","name = ?", new String[]{name});

    }

    //修改
    public void update(String tj,String name,String sex){
        //要去修改person中的name, sex,根据name 为 ？ 的 条件去修改
        ContentValues values = new ContentValues();
        values.put("name",name);
        values.put("sex",sex);
        db.update("person",values,"name = ?",new String[]{tj});

    }
    public void DeleAll(){
        db.execSQL("DELETE FROM person");
    }
}