我是一個相當新手與休眠,但我一直在使用Netbeans和休眠反向工程工具從現有的模式生成POJO。每個表的所有POJO都創建得很好,除了連接表,我相信它應該是這樣的,因爲我可以看到關聯正在映射文件中創建。但是,當我嘗試執行HBL查詢時出現問題,我得到一個異常,我的一個連接表未映射。我知道在配置文件中有一個映射條目,我唯一能想到的就是我的數據模型不正確。我有一個相當大的ER模型,但問題表是休眠生成POJOs
我有用戶,學生,主要和StudentMajor表。下面是我創建語句
CREATE TABLE IF NOT EXISTS `Portfolio`.`User` (
`919Number` INT(11) NOT NULL ,
`loginId` VARCHAR(45) NOT NULL ,
`password` VARCHAR(8) NOT NULL ,
`userType` VARCHAR(10) NOT NULL ,
`lastName` VARCHAR(45) NULL DEFAULT NULL ,
`firstName` VARCHAR(45) NULL DEFAULT NULL ,
PRIMARY KEY (`919Number`));
CREATE TABLE IF NOT EXISTS `Portfolio`.`Student` (
`919Number` INT(11) NOT NULL ,
`LEVL_CODE` VARCHAR(10) NOT NULL ,
PRIMARY KEY (`919Number`) ,
INDEX `919Number` (`919Number` ASC) ,
CONSTRAINT `919Number`
FOREIGN KEY (`919Number`)
REFERENCES `Portfolio`.`User` (`919Number`)
ON DELETE NO ACTION
ON UPDATE NO ACTION);
CREATE TABLE IF NOT EXISTS `Portfolio`.`Major` (
`majorCode` VARCHAR(10) NOT NULL ,
`majorDescription` VARCHAR(45) NULL DEFAULT NULL ,
PRIMARY KEY (`majorCode`));
CREATE TABLE IF NOT EXISTS `Portfolio`.`StudentMajor` (
`919Number` INT(11) NOT NULL ,
`majorCode` VARCHAR(10) NOT NULL ,
PRIMARY KEY (`919Number`, `majorCode`) ,
INDEX `studentmajor_919Number` (`919Number` ASC) ,
INDEX `studentmajor_majorCode` (`majorCode` ASC) ,
CONSTRAINT `studentmajor_919Number`
FOREIGN KEY (`919Number`)
REFERENCES `Portfolio`.`Student` (`919Number`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `studentmajor_majorCode`
FOREIGN KEY (`majorCode`)
REFERENCES `Portfolio`.`Major` (`majorCode`)
ON DELETE NO ACTION
ON UPDATE NO ACTION);
這裏是我的休眠配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/portfolio</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">jta</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</property>
<mapping resource="com/portfolio/hibernate/mappings/User.hbm.xml"/>
<mapping resource="com/portfolio/hibernate/mappings/Student.hbm.xml"/>
<mapping resource="com/portfolio/hibernate/mappings/Major.hbm.xml"/>
</session-factory>
</hibernate-configuration>
,我使用NetBeans冬眠POJO genereation工具。但是,當我運行查詢,我得到以下異常:
org.hibernate.MappingException:從表中 的 協會studentmajor是指未映射 類: com.portfolio.hibernate.mappings.Student 在 org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1252) 在 org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1170) 在 org.hibernate.cfg.AnnotationConfiguration.secondPassCompile( AnnotationConfiguration.java:324) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1286) 在 org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
是否有可能該錯誤是由我建模我的表的方式造成的?任何幫助將不勝感激。
建議我包括學生和專業的hbm.xml文件的內容。
學生:::
<hibernate-mapping>
<class name="com.jopos.Student" table="student" catalog="portfolio">
<id name="nineOneNumber" type="int">
<column name="nineOneNumber" />
<generator class="assigned" />
</id>
<many-to-one name="user" class="com.jopos.User" update="false" insert="false" fetch="select">
<column name="nineOneNumber" not-null="true" unique="true" />
</many-to-one>
<property name="levlCode" type="string">
<column name="LEVL_CODE" length="10" not-null="true" />
</property>
<set name="faculties" inverse="false" table="advises">
<key>
<column name="studentnineOneNumber" not-null="true" />
</key>
<many-to-many entity-name="com.jopos.Faculty">
<column name="facultynineOneNumber" not-null="true" />
</many-to-many>
</set>
<set name="majors" inverse="false" table="studentmajor">
<key>
<column name="nineOneNumber" not-null="true" />
</key>
<many-to-many entity-name="com.jopos.Major">
<column name="majorCode" length="10" not-null="true" />
</many-to-many>
</set>
<set name="enrolls" inverse="true">
<key>
<column name="nineOneNumber" not-null="true" />
</key>
<one-to-many class="com.jopos.Enroll" />
</set>
</class>
</hibernate-mapping>
主要:::
<hibernate-mapping>
<class name="com.jopos.Major" table="major" catalog="portfolio">
<id name="majorCode" type="string">
<column name="majorCode" length="10" />
<generator class="assigned" />
</id>
<property name="majorDescription" type="string">
<column name="majorDescription" length="45" />
</property>
<set name="students" inverse="true" table="studentmajor">
<key>
<column name="majorCode" length="10" not-null="true" />
</key>
<many-to-many entity-name="com.jopos.Student">
<column name="nineOneNumber" not-null="true" />
</many-to-many>
</set>
</class>
</hibernate-mapping>
分享你的`hbm`文件的內容也很重要。 – 2010-11-24 03:19:20