如何在 NHibernate QueryOver 中找到匹配的数据对？

问题描述

我有两个列表。

AccountNumbers  ["account1","account2","account3"]
Descriptions [ "desc1","" ] (possible should be empty value)

我有两个数据库表 Account 和 AccountDescriptionHistory。表与 accountId 有关系。

账户表设计：- AccountId,AccountNumber,描述,

帐户描述历史记录：- AccountId、描述、validTo、validFrom

现在，我想设计一个 Nhibernet 查询，其中包含以下要求的查询。

1. Account 表应与 AccountDescriptionHistory 连接，左连接与 accountId 列连接。

2. 帐号应从通过 accountnumbers 的列表中过滤掉。

3. Description 应该从 descriptions 的传递列表中匹配，并且 如果传递参数 accountdescriptionhistory 是从 datetocheck 表中选择描述 大于和小于 validFrom 和 validTo 列的 accountdescriptionhistory 否则，从 account 表中选择。

4. 考虑数据库列中的空值和小写值

我已尝试使用以下查询，但不知道如何从集合中进行过滤。

        public IEnumerable<Account> CheckForExistingAccounts(ISession session,Owner owner,IEnumerable<string> accountNumbers,IEnumerable<string> descriptions,bool isUpdating,DateTime? datetocheck = null)
    {
        Account accountAlias = null;
        AccountDescriptionHistory accountDescripAlias = null;


        var existingaccountsquery = session.queryover(() => accountalias).
                                joinentityalias(() => accountdescripalias,() => accountdescripalias.account.id == accountalias.id,jointype.leftouterjoin).
                                where(account => !account.isdeleted && account.owner.id == owner.id).
                                selectlist(list => list
                                        .select(() => accountalias.id).withalias(() => accountalias.id)
                                        .select(projections.conditional(expression.isnull(
                                                projections.property(accountalias.accountnumber)),projections.property(string.empty),projections.property(string.empty))).withalias(() => accountalias.accountnumber)
                                        .select(() => accountalias.changed).withalias(() => accountalias.changed)
                                        .select(() => accountalias.created).withalias(() => accountalias.created)
                                        .select(() => accountalias.sequencenumber).withalias(() => accountalias.sequencenumber)
                                        .select(() => accountalias.accounttype).withalias(() => accountalias.accounttype)
                                        .select(() => accountalias.parentaccount).withalias(() => accountalias.parentaccount)
                                        .select(() => accountalias.coreaccountid).withalias(() => accountalias.coreaccountid)
                                        .select(() => accountalias.sourceid).withalias(() => accountalias.sourceid)
                                        .select(() => accountalias.description).withalias(() => accountalias.description)
                                ).transformusing(new deeptransformer<account>()).future<account>();



        var data = existingaccountsquery.List();

        return data;
    }

解决方法

我针对上述描述性问题或问题开发了查询。如果将来对其他开发者有帮助，我会在这里发帖。

`var existingAccountsQuery = session.QueryOver(() => accountAlias)
        .JoinEntityAlias(() => accountDescripAlias,Restrictions.And
                    (
                        //And clause 1
                        Restrictions.EqProperty($"{nameof(accountAlias)}.{nameof(accountAlias.Id)}","accountDescripAlias.Account.Id"),//And clause 2
                        Restrictions.And(
                            Restrictions.Le(
                                Projections.SqlFunction("date",NHibernateUtil.Date,Projections.Property(
                                    $"{nameof(accountDescripAlias)}.{nameof(accountDescripAlias.ValidFrom)}")),dateToCheck),Restrictions.Ge(
                                Projections.SqlFunction("date",dateToCheck)
                            )
                    ),JoinType.LeftOuterJoin)
        .Where(() => !accountAlias.IsDeleted && accountAlias.Owner.Id == owner.Id)
        .Where(() => accountAlias.AccountNumber == null || accountAlias.AccountNumber.Lower().IsIn(accountNumbers.ToArray()))
        .Where(() =>
            (
                accountDescripAlias.AccountDescription != null &&
                accountDescripAlias.ValidFrom <= dateToCheck && accountDescripAlias.ValidTo >= dateToCheck &&
                accountDescripAlias.AccountDescription.Lower().IsIn(descriptions.ToArray())
            ) ||
            (
                accountDescripAlias.AccountDescription == null &&
                accountAlias.Description != null &&
                accountAlias.Description.Lower().IsIn(descriptions.ToArray())
            ) ||
            (
                accountDescripAlias.AccountDescription == null &&
                accountAlias.Description == null
            )
        );`