hbm.xml配置说明（国外英文资料）.docVIP

hbm.xml配置说明（国外英文资料） Hibernate the hbm.xml configuration specification. In Hibernate, the mapping files for each table... Hbm.xml can be generated by tooling, for example, when using MyEclipse development, it provides the tools to automatically generate the mapping files. The basic structure of the configuration file is as follows: Xml code 1 ? XML version = 1.0 encoding = utf-8? 2 3 ! DOCTYPE hibernate - mapping to the PUBLIC 4 - / / Hibernate/Hibernate Mapping DTD 3.0 / / EN 5 /hibernate-mapping-3.0.dtd Hibernate - mapping package = package name Class name = class name table table = table name The id name = primary key in the Java class name column = column = type = type = type The generator class = primary key generation strategy / 10 / id 11 12... 13 / class 14 / hibernate mapping - Primary key (id) Hibernates primary key generation strategy is the following: 1) assigned The primary key is generated by the external program and specified before save (). 2) hilo The primary key generation mechanism implemented by the hi/lo algorithm requires additional database tables or fields to provide high value sources. 3) seqhilo Similar to hilo, the primary key generation mechanism implemented by the hi/lo algorithm requires a Sequence in the database that is applicable to a database that supports a Sequence, such as Oracle. 4) increment The primary key is increasing in numerical order. This way the implementation of the system for maintaining a variable in the current application instance, to save the current maximum, after each time you need to generate a primary key to this value plus one as the primary key. The problem with this approach is that you cant use it under a cluster. 5) identity Adopt the primary key generation mechanism provided by the database. The primary key generation mechanism in DB2, SQL Server, and MySQL. 6) sequence Use the sequence mechanism provided by the database to generate the primary key. The Sequence in Oralce. 7) native By using