Hibernate还是比较常用的,于是我研究了一下Hibernate初始化,在这里拿出来和大家分享一下,希望对大家有用。
Hibernate有两种配置文件格式,一种是XML,默认为hibernate.cfg.xml,一种是properties,默认为Hibernate.properties。不同的配置文件,对Hibernate初始化方法是不一样的
比如,如果采用properties文件作为配置文件,那么Hibernate初始化的代码大致为
- Configuration config = new Configuration();
- config.addClass(myclass.class);
如果配置文件为XML,则
- Configuration config = new Configuration().config();
XML文件格式的配置文件不支持addClass方法!!!这是因为在配置文件XML文件中,已经定义了Mpaaing文件,因此就不需要在用编码方式导入POJO文件了。
另:网上好多文章,甚至有的书都说,Hibenate的配置文件必须放在class的根目录,参考一下API,发现这个说法是不正确的,例如 Configuration config = new Configuration().config(配置文件名);完全可以的。
所有config方法如下:
- addCacheableFile(File xmlFile)
-
- If a cached xmlFile + ".bin" exists and is newer than xmlFile the ".
bin" file will be read directly.
-
- Configuration addClass(Class persistentClass)
- Read a mapping from an application resource, using a convention.
-
- Configuration addDirectory(File dir)
- Read all mapping documents from a directory tree.
-
- Configuration addDocument(org.w3c.dom.Document doc)
- Read mappings from a DOM Document
-
- Configuration addFile(File xmlFile)
- Read mappings from a particular XML file
-
- Configuration addFile(String xmlFile)
- Read mappings from a particular XML file
-
- void addFilterDefinition(FilterDefinition definition)
-
- Configuration addInputStream(InputStream xmlInputStream)
- Read mappings from an InputStream
-
- Configuration addJar(File jar)
- Read all mappings from a jar file
-
- Configuration addProperties(Properties extraProperties)
- Set the given properties
-
- Configuration addResource(String path)
- Read mappings from an application resource trying different classloaders.
-
- Configuration addResource(String path, ClassLoader classLoader)
- Read mappings from an application resource
-
- Configuration addURL(URL url)
- Read mappings from a URL
-
- Configuration addXML(String xml)
- Read mappings from a String
以上为笔者刚接触Hibernate初始化的一个总结,不正确的地方还请各位多多指教!!
(常州java培训机构)