Question

我使用netbeans自动生成代码来创建Hibernate配置;所以我有两个像这样映射的表（多对多）：

<hibernate-mapping auto-import="true">
<class name="com.antoiovi.jobprograms.entity.Roles" table="roles"   catalog="jobprograms">
    <id name="rolesName" type="string">
        <column name="roles_name" length="20" />
        <generator class="assigned" />
    </id>
    <set name="userses" table="users_roles" inverse="true" lazy="false" fetch="select" cascade="all">
        <key>
            <column name="role_name" length="20" not-null="true" />
        </key>
        <many-to-many entity-name="com.antoiovi.jobprograms.entity.Users">
            <column name="user_name" length="15" not-null="true" />
        </many-to-many>
    </set>
</class>

 <hibernate-mapping  auto-import="true">
<class name="com.antoiovi.jobprograms.entity.Users" table="users" catalog="jobprograms">
    <id name="idusers" type="java.lang.Integer">
        <column name="idusers" />
        <generator class="identity" />
    </id>
    <property name="userName" type="string">
        <column name="user_name" length="15" not-null="true" unique="true" />
    </property>
    <property name="userPass" type="string">
        <column name="user_pass" length="15" not-null="true" />
    </property>
    <property name="firstName" type="string">
        <column name="first_name" length="20" />
    </property>
    <property name="lastName" type="string">
        <column name="last_name" length="25" />
    </property>
    <set name="roleses" table="users_roles" inverse="true" lazy="false" fetch="select" cascade="all">
        <key>
            <column name="user_name" length="15" not-null="true" />
        </key>
        <many-to-many entity-name="com.antoiovi.jobprograms.entity.Roles">
            <column name="role_name" length="20" not-null="true" />
        </many-to-many>
    </set>
    <set name="jobprograms" table="jobprogram" inverse="true" lazy="false" fetch="select" cascade="all">
        <key>
            <column name="users_idusers" not-null="true" />
        </key>
        <one-to-many class="com.antoiovi.jobprograms.entity.Jobprogram" />
    </set>
</class>

我已经做了一些修改，如上所示（auto-import = true，lazy = false），因为我有错误信息

rg.hibernate.MappingException: An association from the table users_roles refers to an unmapped class: com.antoiovi.jobprograms.entity.Roles
at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1824)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1756)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1423)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1856)

配置文件是

<hibernate-configuration>

org.hibernate.dialect.MySQLDialect com.mysql.jdbc.Driver JDBC：MySQL的：//本地主机：3306 / jobprograms zeroDateTimeBehavior = convertToNull jobprograms_ad XXXXX 线真正 org.hibernate.hql.classic.ClassicQueryTranslatorFactory 真正这些课程的推荐是这样的：

'@ManyToMany(fetch=FetchType.LAZY, mappedBy="roleses")
public Set<Users> getUserses() {
    return this.userses;
} '

@ManyToMany(fetch=FetchType.EAGER) @JoinTable(name="users_roles", catalog="jobprograms", joinColumns = { @JoinColumn(name="user_name", nullable=false, updatable=false) }, inverseJoinColumns = { @JoinColumn(name="role_name", nullable=false, updatable=false) }) public Set<Roles> getRoleses() { return this.roleses; }

wHEN RUNNING我有错误org.hibernate.exception.SQLGrammarException，实际上是加载了entiti，但是set＆lt;＆gt;不..，当测试错误时 org.hibernate.MappingException：表users_roles中的关联引用了未映射的类：com.antoiovi.jobprograms.entity.Roles，并且未执行HSQL。

我试着查看其他帖子，但我无法找到答案。有人能帮助我吗？

在配置文件中，所有实体都被声明; 我认为你的承诺是在映射中：

e <set name="roleses" table="users_roles" inverse="false" lazy="true" fetch="select" >
        <key >
            <column name="user_name" length="15" not-null="true"  />
        </key>
        <many-to-many entity-name="test.Roles" property-ref="rolesName">
            <column name="role_name" length="20" not-null="true" />
        </many-to-many>
    </set>
    <set name="jobprograms" table="jobprogram" inverse="true" lazy="true" fetch="select">
        <key>
            <column name="users_idusers" not-null="true" />
        </key>
        <one-to-many class="test.Jobprogram" />
    </set>

和

enter  <class name="test.Roles" table="roles" catalog="jobprograms">
    <id name="rolesName" type="string">
        <column name="roles_name" length="20" />
        <generator class="assigned" />
    </id>
    <set name="userses" table="users_roles" inverse="true" lazy="true" fetch="select">
        <key property-ref="rolesName">
            <column name="role_name" length="20" not-null="true" />
        </key>
        <many-to-many entity-name="test.Users" property-ref="userName">
            <column name="user_name" length="15" not-null="true" />
        </many-to-many>
    </set>
</class>

...

Answer 1

这个错误 org.hibernate.MappingException：表users_roles中的关联引用了未映射的类：com.antoiovi.jobprograms.entity.Roles

来自hibernate配置时不知道实体（Roles）映射，要么你错过了对hibernate配置引入enitity Roles，要么你没有使用正确的名称，请检查configuraiton文件并包含com.antoiovi.jobprograms.entity.Roles作为资源

Answer 2

我认为已经解决了这个问题。实际上问题是未映射的实体。但这是因为数据库没有“良好形成”。确实数据库ha 3表用户，users_roles，角色;表角色只有一列作为主键（varchar），表user_roles从其列user_roles引用它;当forword enginering ide（在netbeans的情况下）只创建2个实体：'Users'和'Roles';所以我重新设计了模式，放置了一些虚拟主键，并创建了唯一的constaint。现在我有3个实体：Users，UserRoles和Roles。

Hibernate org.hibernate.MappingException ...一个关联..到未映射的类 - Manytomany

2 个答案: