Question

我的传奇课程如下：

public class SagaData : IContainSagaData
{
    [Unique]
    public virtual string SagaKey { get; set; }

    public virtual string Data { get; set; }

    #region IContainSagaData

    public virtual Guid Id { get; set; }

    public virtual string Originator { get; set; }

    public virtual string OriginalMessageId { get; set; }

    #endregion IContainSagaData
}

我在MSSQL中坚持Sagas。创建的表具有以下结构：

CREATE TABLE [dbo].[SagaData](
    [Id] [uniqueidentifier] NOT NULL,
    [SagaKey] [nvarchar](255) NULL,
    [Data] [nvarchar](255) NULL,
    [Originator] [nvarchar](255) NULL,
    [OriginalMessageId] [nvarchar](255) NULL,
PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
UNIQUE NONCLUSTERED 
(
    [SagaKey] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

Data属性（字符串类型）已映射到nvarchar(255)。显然，当我为该属性分配超过255个字符时，它会失败并显示消息：String or binary data would be truncated。我该如何强行制作nvarchar(max)？

我正在使用NServiceBus 4.4.2。

Answer 1

解决方案非常简单。我为该类添加了一个HBM文件，将其设置为Embedded Resource，NHibernate自动加载它。这是它的外观：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="LuxMed.BackEnd.CRM.B2C.NSB.Host"
                   namespace="LuxMed.BackEnd.CRM.B2C.NSB.Host.Sagas">
  <class name="SagaData">
    <id name="Id" />
    <property name="SagaKey" unique="true" />
    <property name="Data" type="StringClob" />
    <property name="Originator" />
    <property name="OriginalMessageId" />
  </class>
</hibernate-mapping>

type="StringClob"是DB中nvarchar(max)的原因。

NServiceBus和nvarchar（最大）

1 个答案: