如何以编程方式将会话映射资源添加到Hibernate配置以创建会话工厂？

问题描述

我试图使用hibernate / Java / GWT动态创建模式，我正在动态创建 cfg.xml 和 hbm.xml 文件并将它作为blob存储在数据库中。

所以我想为模式构建 sessionfactory 。
为此，我使用cfg.xml文件创建配置对象，但由于我的hbm.xml文件位于其他表中，因此它们不是文件系统上的文件，所以我怎么能将其作为资源添加到配置对象中。
我不想在文件系统上为它们创建文件。

我尝试了 addInputStream（）， addFile（）方法，但它们正在抛出 MappingNotFoundException 。

作为常规方法，我知道如何创建sessionfactory例如通过将< mapping resource =abc.hbm.xml> 标签添加到cfg.xml等等。但是在这里，如何将它们添加到配置中，因为我没有hbm.xml文件？

我的cfg.xml文件存储在表中：

 <？xml version =1.0encoding =UTF-8standalone =no？> 
< hibernate-configuration> 
< session-factory> 
< property name =hibernate.connection.driver_class> com.mysql.jdbc.Driver< / property> 
< property name =hibernate.connection.password> passwd< / property> 
< property name =hibernate.connection.driver_class> com.mysql.jdbc.Driver< / property> 
< property name =hibernate.connection.url> jdbc：mysql：// localhost：3306 / testSchema< / property> 
< property name =hibernate.connection.username>根< / property> 
< property name =hibernate.dialect> org.hibernate.dialect.MySQLInnoDBDialect< / property> 
< property name =javax.persistence.validation.mode> none< / property> 
< property name =hibernate.temp.use_jdbc_metadata_defaults> false< / property> 
< property name =hibernate.default_entity_mode> dynamic-map< / property> 
< / session-factory> 
< / hibernate-configuration> 
  

我的hbm.xml文件存储在表格中

：

 <？xml version =1.0encoding =UTF-8standalone =no？> 
< hibernate-mapping> 
< class entity-name =testTable1> 
< id column =idname =idtype =Long> 
< generator class =identity/> 
< / id> 
< property column =idlength =20name =idtype =Long/> 
< property column =booleanColumnlength =1name =booleanColumntype =Byte/> 
< property column =doubleColumnlength =20name =doubleColumntype =Long/> 
< property column =dateColumnname =dateColumntype =Double/> 
< / class> 
< / hibernate-mapping> 
  

解决方案

得到了答案，我必须使用文件字节从DB中读取，然后将它们添加到配置对象中---

创建文档，

  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance（）; 
 DocumentBuilder builder = factory.newDocumentBuilder（）; 
 Document doc = builder.parse（bytesOfFile）; 
  

然后，

  hibernateConfiguration.addDocument（DOC）; 
  

这对我很有用。
谢谢。

I am trying to create schema dynamically using hibernate / Java/ GWT, I am creating cfg.xml and hbm.xml files dynamically and storing it in database as blob.

So I want to build sessionfactory for the schema. For the same I am creating configuration object using cfg.xml file, but since my hbm.xml files are in other table, they are not files on the file system, so how can I add it to configuration object as resource. I do not want to create files for them on file system.

I tried addInputStream(), addFile() methods but they are throwing MappingNotFoundException.

As regular method I know how to create sessionfactory like by adding the <mapping resource="abc.hbm.xml"> tag into the cfg.xml and so on. But here how can I add them to configuration because I do not have hbm.xml files?

my cfg.xml file stored in table:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<hibernate-configuration>
   <session-factory>
      <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="hibernate.connection.password">passwd</property>
      <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/testSchema</property>
      <property name="hibernate.connection.username">root</property>
      <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
      <property name="javax.persistence.validation.mode">none</property>
      <property name="hibernate.temp.use_jdbc_metadata_defaults">false</property>
      <property name="hibernate.default_entity_mode">dynamic-map</property>
   </session-factory>
</hibernate-configuration>

my hbm.xml file stored in table:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<hibernate-mapping>
  <class entity-name="testTable1">
    <id column="id" name="id" type="Long">
      <generator class="identity"/>
    </id>
    <property column="id" length="20" name="id" type="Long"/>
    <property column="booleanColumn" length="1" name="booleanColumn" type="Byte"/>
    <property column="doubleColumn" length="20" name="doubleColumn" type="Long"/>
    <property column="dateColumn" name="dateColumn" type="Double"/>
  </class>
</hibernate-mapping>

解决方案

Got the answer, I have to create Document using the file bytes read from DB and then add them in to the configuration object---

create the document,

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(bytesOfFile);

and then,

hibernateConfiguration.addDocument(doc);

This is worked for me.thanks.

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