NHibernate警告，并且数据未保存 [英] NHibernate WARNING and the data is not saved

问题描述

虽然我通过调用SaveOrUpdate()进行保存，但收到此警告，并且在调用Transaction.Commit()之后数据没有保存在数据库中.

While I am saving by calling SaveOrUpdate(), I got this warning and the data is not saving in the database after calling Transaction.Commit().

NHibernate.Engine.ForeignKeys-无法 确定[项目名称]是否与 分配的标识符[primarykey]为 暂时的或分离的；查询 数据库.使用显式的Save()或 会话中的Update()可以防止这种情况.

NHibernate.Engine.ForeignKeys - Unable to determine if [project name] with assigned identifier [primarykey] is transient or detached; querying the database. Use explicit Save() or Update() in session to prevent this.

我正在插入一个新对象. Google搜索告诉我调用Save()而不是SaveOrUpdate():这意味着Save()仅用于插入.

I am inserting a new object. Google search tell me to call Save() instead of SaveOrUpdate(): means Save() is only for inserting.

我在Google中搜索，对此了解不多. 有人可以给我关于这个问题或警告的建议吗?

I search in Google and do not see much about this. Could anyone give me suggestion for this problem or this warning?

这是模拟的样本映射文件-

Here is the simulated sample mapping files -

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly=""
                   namespace="">
    <class name="Customer" table="[dbo].[Customer]" optimistic-lock="none" >
        <id name="CustomerId" column="CustomerId" >
            <generator class="assigned"/>
        </id>
        <property name="Name" column="Name" /> 
        <property name="Age" column="Age" /> 
        <set name="CustomerDetails" cascade="none" inverse="true" fetch="select">
            <key>
                <column name="CustomerId"/>
            </key>
            <one-to-many class="CustomerDetail"/>
        </set> 
        <many-to-one name="MGender" fetch="select" cascade="none">
            <column name="GenderCode"/>
        </many-to-one> 
    </class>
</hibernate-mapping>

<class name="CustomerDetails" table="[dbo].[CustomerDetail]" optimistic-lock="none" >
    <id name="CustomerDetailId" column="CustomerDetailId" >
        <generator class="assigned"/>
    </id>
    <property name="Detail1" column="Detail1" /> 
    <many-to-one name="Customer" fetch="select" cascade="none">
        <column name="CustomerId"/>
    </many-to-one> 
</class>

<class name="MGender" table="[dbo].[MGender]" optimistic-lock="none" >
    <id name="GenderCode" column="GenderCode" >
        <generator class="assigned"/>
    </id>
    <property name="Description" column="Description" /> 
    <set name="Customers" cascade="none" inverse="true" fetch="select">
        <key>
            <column name="GenderCode"/>
        </key>
        <one-to-many class="Customer"/>
    </set> 
</class>

推荐答案

您正在使用分配的标识符，因此需要设置未保存的值属性，以便NHibernate可以确定是否应插入或更新实体.或者，您可以显式调用保存"以获取新实体.

You're using an assigned identifier so you need to set the unsaved-value attribute so that NHibernate can determine if an entity should be inserted or updated. Or you can explicitly call Save for new entities.

    <id name="CustomerId" column="CustomerId" unsaved-value="???" >
        <generator class="assigned"/>
    </id>

这篇关于NHibernate警告，并且数据未保存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！