Question

我试图在两个表之间建立一对多的关系。我有一个名为users的表，其中包含许多user_history条目。我在mysql中定义了这些表，并使用intellij hibrernate支持生成实体。问题是，当我想在数据库中插入一些东西时，我收到以下错误实体映射中的重复列：com.UserHistoryEntity

用户：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

    <class name="com.UsersEntity" table="users" schema="" catalog="protein_tracker">
        <id name="id">
            <column name="id" sql-type="int" not-null="true"/>
        </id>
        <property name="name">
            <column name="name" sql-type="varchar" length="45" not-null="true"/>
        </property>
        <property name="total">
            <column name="total" sql-type="int" not-null="true"/>
        </property>
        <property name="goal">
            <column name="goal" sql-type="int" not-null="true"/>
        </property>
        <set name="userHistoriesById" inverse="true">
            <key>
                <column name="id_user" not-null="true"/>
            </key>
            <one-to-many not-found="ignore" class="com.UserHistoryEntity"/>
        </set>
    </class>
</hibernate-mapping>

UserHistory：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

    <class name="com.UserHistoryEntity" table="user_history" schema="" catalog="protein_tracker">
        <id name="id">
            <column name="id" sql-type="int" not-null="true"/>
        </id>
        <property name="entryDate">
            <column name="entry_date" sql-type="datetime" not-null="true"/>
        </property>
        <property name="entry">
            <column name="entry" sql-type="varchar" length="45" not-null="true"/>
        </property>
        <property name="idUser">
            <column name="id_user" sql-type="int" not-null="true"/>
        </property>
        <many-to-one name="usersByIdUser" class="com.UsersEntity">
            <column name="id_user" not-null="true"/>
        </many-to-one>
    </class>
</hibernate-mapping>

如何解决此问题？

Answer 1

将usersByIdUser的Many-To-One映射标记为insertable = false，updatable = false。这允许关系仅由您映射的单个属性idUser管理。

实体，oneToMany关系映射中的重复列

1 个答案: