How to store a non truncated varchar(max) string with NHibernate and Fluent NHibernate

问题

My DB schema has a string as a varchar(max). I have read the other questions concerning setting Length to more than 4000 or 8000 so that it really generates a (n)varchar(max) in the mapping but when I use Length(10000) in my mapping class, the hbm file actually shows length="10000" and if I save an entity with more than 10000 chars, it is actually truncated to exactly 10000 chars.

I don't want any truncation.

(using NH3-alpha2 and FNH trunk)

回答1:

It would appear that this is an old problem which is now resurfacing in NHibernate 3.x builds; you can read about the workarounds here.

Note: I have updated the original link I posted as it was outdated.

回答2:

This mapping should work:

<property name="TheProperty" type="StringClob">
  <column name="TheColumn" sql-type="nvarchar(max)" />
</property>

Just look for the fluent equivalent.

回答3:

DanP's link is broken. The updated link is:

http://www.primordialcode.com/blog/post/nhibernate-prepare_sql-considerations-mapping-long-string-fields

来源：https://stackoverflow.com/questions/3701907/how-to-store-a-non-truncated-varcharmax-string-with-nhibernate-and-fluent-nhib