MyBatis-plus聚合查询、表关联、条件更新实践

QueryWrapper<BookArangeDO> arangeQuery = new QueryWrapper<BookArangeDO>()
        .eq("status", "1")
        .in("book_no", bookNoList)
        .select("book_no", "count(book_no) as arange_count")
        .groupBy("book_no").having("arange_count > {0}", 0)
        ;
List<Map<String, Object>> mapList = bookArangeMapper.selectMaps(arangeQuery);
Map<String, Integer> countMap = new HashMap<>();
mapList.forEach(bookArangeDO -> {
    countMap.put(bookArangeDO.get("book_no").toString(), Integer.valueOf(bookArangeDO.get("arange_count").toString()));
});

SELECT book_no, count(book_no) AS arange_count 
FROM bl_book_arange 
WHERE deleted = 0 AND (status = ? AND book_no IN (?, ?)) AND tenant_id = 1 
GROUP BY book_no HAVING arange_count > ?

MPJLambdaWrapperX<BookArangeDO> queryWrapperX = new MPJLambdaWrapperX<>();
queryWrapperX
        .select(BookArangeDO::getBookNo, BookArangeDO::getTenantId)
        .leftJoin(BookCopyDO.class, BookCopyDO::getBookNo, BookArangeDO::getBookNo)
        .eq(BookCopyDO::getStatus, "3")    // 可借阅
        .eq(BookArangeDO::getStatus, "1")  // 预约中
        ;
Page<Map<String, Object>> page = new Page<>(1, 10);
page = bookArangeMapper.selectJoinMapsPage(page, queryWrapperX);

SELECT t.book_no,t.tenant_id
FROM bl_book_arange  t    
LEFT JOIN bl_book_copy t1 ON (t1.book_no = t.book_no)  
WHERE  t.deleted=0 AND t1.deleted=0
AND (t1.status = ? AND t.status = ?)

        LambdaUpdateWrapper<BookCopyDO> updateWrapper = new LambdaUpdateWrapper<>();
        updateWrapper.in(BookCopyDO::getBookNo, bookNos)
                .in(BookCopyDO::getStatus, "6", "3")   // 已归还、可借阅
                .set(BookCopyDO::getTakeupId, SecurityFrameworkUtils.getLoginUserId())
                .set(BookCopyDO::getStatus, '7');       // 已下架
        int n = bookCopyMapper.update(updateWrapper);
        if(n !=bookNos.length) {
            throw new ServiceException("下架失败，请检查书刊条码、上架状态");
        }

UPDATE bl_book_copy SET takeup_id = ?, status = ? 
WHERE deleted = 0 AND (book_no IN (?) AND status IN (?, ?)) AND tenant_id = 1