eq不仅仅可以以数据库实体作为返回结果,也可以通过自定义返回结果VO、DTO无需用户内存映射转换

• 隐式赋值自定义结果select(vo.class,o -> Select.of(...))
• 显式赋值自定义结果select(o -> new proxy()...)
• 系统自带元组草稿类型select(o -> Select.DRAFT.of(...))或select(o -> Select.TUPLE.of(...))
• 系统自带部分元组类型select(o -> Select.PART.of(...))

查询映射

1.返回voproxy

List<BankCardVO> list = easyEntityQuery.queryable(DocBankCard.class)
        .leftJoin(DocUser.class, (bank_card, user) -> bank_card.uid().eq(user.id()))
        .leftJoin(DocBank.class, (bank_card, user, bank) -> bank_card.bankId().eq(bank.id()))
        .where((bank_card, user, bank) -> {
            user.name().like("小明");
            bank_card.type().eq("储蓄卡");
        })
        .select((bank_card, user, bank) -> {
            BankCardVOProxy r = new BankCardVOProxy();//在BanCardVO上添加@EntityProxy注解build时会生成对应的Proxy对象
            r.selectAll(bank_card);//相当于是查询所有的bankCard字段
            r.userName().set(user.name());
            r.bankName().set(bank.name());
            return r;
        }).toList();

2.返回部分列

List<DocBankCard> list = easyEntityQuery.queryable(DocBankCard.class)
        .where(bank_card -> bank_card.type().eq("储蓄卡"))
        .select(bank_card -> bank_card.FETCHER.id().code())
        .toList();

3.隐式映射

List<BankCardVO> list = easyEntityQuery.queryable(DocBankCard.class)
        .leftJoin(DocUser.class, (bank_card, user) -> bank_card.uid().eq(user.id()))
        .leftJoin(DocBank.class, (bank_card, user, bank) -> bank_card.bankId().eq(bank.id()))
        .where((bank_card, user, bank) -> {
            user.name().like("小明");
            bank_card.type().eq("储蓄卡");
        })
        .select((bank_card, user, bank) -> new ClassProxy<>(BankCardVO.class)
            //自动映射bank_card全属性等于select t.*但是以结果为主
            .selectAll(bank_card)
            //可以使用字符串:"userName"或者lombok的@FieldNameConstant注解
            .field("userName").set(user.name())
            .field("bankName").set(bank.name())
        ).toList();

4.全自动映射

List<SysBankDTO> list = easyEntityQuery.queryable(SysBank.class)
        .selectAutoInclude(SysBankDTO.class)
        .toList();