如何设置hibernate-mapping以允许字符串超过255个字符？ [英] How to set hibernate-mapping to allow for Strings longer than 255 characters?

问题描述

所以我试图通过创建一个博客引擎来学习。我在MySQL中使用Hibernate。这是我的Post类的hibernate-mapping：

 < hibernate-mapping package =com.enw.blog > 
< class name =Posttable =POST> 
< id name =idcolumn =POST_ID> 
< generator class =native/> 
< / id> 
< property name =title/> 
< property name =text/> 
< property name =datetype =timestampcolumn =POST_DATE/> 
< / class> 
< / hibernate-mapping> 
  

当然，一篇文章可能会很长。默认情况下，这会设置一个表，其中的字符串表示为 VARCHAR（255）。我怎么改变它？

我也很欣赏指向文档中正确位置的指针，我似乎无法有效地导航它们。

解决方案

length 应该完成这项工作！

 < property name =titlelength =1234/> 
  

请参阅第5章基本O / R映射：属性

So I'm trying to learn by creating a blog-engine. I'm using Hibernate with MySQL. Here is my hibernate-mapping for the "Post" class:

 <hibernate-mapping package="com.enw.blog">
   <class name="Post" table="POST">
     <id name="id" column="POST_ID">
       <generator class="native"/>
     </id>
     <property name="title"/>
     <property name="text"/>
     <property name="date" type="timestamp" column="POST_DATE"/>
   </class>
 </hibernate-mapping>

Of course, a post could be long. By default this sets up a table with the Strings represented as VARCHAR(255). How do I alter this?

I'd also appreciate a pointer to the right place in the docs, I can't seem to navigate them effectively.

解决方案

length should do the job!

<property name="title" length="1234"/>

See Chapter 5. Basic O/R Mapping: Property

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