数据库

##建数据库
public class SqliteHelper extends SQLiteOpenHelper {
    public SqliteHelper(Context context) {
        super(context, \"User.db\", null, 1);
    }

    @Override
    public void onCreate(SQLiteData  db) {
        db.execSQL(\"create table user(id integer primary key autoincrement,\" +
                \"name text,\" +
                \"img text)\");
    }

    @Override
    public void onUpgrade(SQLiteData  db, int oldVersion, int newVersion) {

    }
}
##UserDao层

public class UserDao {

    private final SQLiteData  db;

    public UserDao(Context context){
        SqliteHelper sqliteHelper = new SqliteHelper(context);
        db = sqliteHelper.getWritableData ();
    }
    //添加
    public void insert(String name,String img){
        ContentValues values = new ContentValues();
        values.put(\"name\",name);
        values.put(\"img\",img);

        db.insert(\"user\", null, values);
    }
    //查询
    public List<NewBean.NewData> query(){
        Cursor query = db.query(\"user\", null, null, null, null, null, null);
        ArrayList<NewBean.NewData> list = new ArrayList<>();
        while (query.moveToNext()){
            String name = query.getString(query.getColumnIndex(\"name\"));
            String img = query.getString(query.getColumnIndex(\"img\"));
            list.add(new NewBean.NewData(name,img));
        }
        return list;
    }
    //删除
    public void delete(String name){
        db.delete(\"user\",\"name=?\",new String[]{name});
    }
}