Question

我已经在Kotlin-vertx项目中配置了Hibernate，我设法完成了所有设置，但是当我运行HQL查询时，它会输出：

严重：org.hibernate.hql.internal.ast.QuerySyntaxException：电影是未映射[从m AS电影在m.id =：id中选择m] java.lang.IllegalArgumentException： org.hibernate.hql.internal.ast.QuerySyntaxException：电影不是映射[SELECT m FROM电影AS m WHERE m.id =：id]在 org.hibernate.internal.ExceptionConverterImpl.convert（ExceptionConverterImpl.java:138）在 org.hibernate.internal.ExceptionConverterImpl.convert（ExceptionConverterImpl.java:181）在 org.hibernate.internal.ExceptionConverterImpl.convert（ExceptionConverterImpl.java:188）在 org.hibernate.internal.AbstractSharedSessionContract.createQuery（AbstractSharedSessionContract.java:729）在 org.hibernate.internal.AbstractSharedSessionContract.createQuery（AbstractSharedSessionContract.java:745）在 org.hibernate.internal.AbstractSessionImpl.createQuery（AbstractSessionImpl.java:23）在MonoServer $ main $ 4.handle（MonoServer.kt：46）在 MonoServer $ main $ 4.handle（MonoServer.kt：14）位于 io.vertx.ext.web.impl.RouteImpl.handleContext（RouteImpl.java:231）位于 io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext（RoutingContextImplBase.java:121）在 io.vertx.ext.web.impl.RoutingContextImpl.next（RoutingContextImpl.java:131）在io.vertx.ext.web.impl.RouterImpl.handle（RouterImpl.java:80）处 io.vertx.ext.web.impl.RouterImpl.handle（RouterImpl.java:41）位于 io.vertx.ext.web.Router.accept（Router.java:64）在 MonoServer $ main $ 3.handle（MonoServer.kt：39）位于 MonoServer $ main $ 3.handle（MonoServer.kt：14）位于 io.vertx.core.http.impl.WebSocketRequestHandler.handle（WebSocketRequestHandler.java:50）在 io.vertx.core.http.impl.WebSocketRequestHandler.handle（WebSocketRequestHandler.java:32）在 io.vertx.core.http.impl.HttpServerRequestImpl.handleBegin（HttpServerRequestImpl.java:149）在 io.vertx.core.http.impl.Http1xServerConnection.handleMessage（Http1xServerConnection.java:135）在io.vertx.core.impl.ContextImpl.executeTask（ContextImpl.java:369）在 io.vertx.core.impl.EventLoopContext.execute（EventLoopContext.java:43）在io.vertx.core.impl.ContextImpl.executeFromIO（ContextImpl.java:232）在 io.vertx.core.net.impl.VertxHandler.channelRead（VertxHandler.java:173）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:359）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:345）在 io.netty.channel.AbstractChannelHandlerContext.fireChannelRead（AbstractChannelHandlerContext.java:337）在 io.vertx.core.http.impl.Http1xUpgradeToH2CHandler.channelRead（Http1xUpgradeToH2CHandler.java:99）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:359）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:345）在 io.netty.channel.AbstractChannelHandlerContext.fireChannelRead（AbstractChannelHandlerContext.java:337）在 io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead（ByteToMessageDecoder.java:323）在 io.netty.handler.codec.ByteToMessageDecoder.channelRead（ByteToMessageDecoder.java:297）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:359）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:345）在 io.netty.channel.AbstractChannelHandlerContext.fireChannelRead（AbstractChannelHandlerContext.java:337）在 io.vertx.core.http.impl.Http1xOrH2CHandler.end（Http1xOrH2CHandler.java:61）在 io.vertx.core.http.impl.Http1xOrH2CHandler.channelRead（Http1xOrH2CHandler.java:38）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:359）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:345）在 io.netty.channel.AbstractChannelHandlerContext.fireChannelRead（AbstractChannelHandlerContext.java:337）在 io.netty.channel.DefaultChannelPipeline $ HeadContext.channelRead（DefaultChannelPipeline.java:1408）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:359）在 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead（AbstractChannelHandlerContext.java:345）在 io.netty.channel.DefaultChannelPipeline.fireChannelRead（DefaultChannelPipeline.java:930）在 io.netty.channel.nio.AbstractNioByteChannel $ NioByteUnsafe.read（AbstractNioByteChannel.java:163）在 io.netty.channel.nio.NioEventLoop.processSelectedKey（NioEventLoop.java:677）在 io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized（NioEventLoop.java:612）在 io.netty.channel.nio.NioEventLoop.processSelectedKeys（NioEventLoop.java:529）在io.netty.channel.nio.NioEventLoop.run（NioEventLoop.java:491）处 io.netty.util.concurrent.SingleThreadEventExecutor $ 5.run（SingleThreadEventExecutor.java:905）在 io.netty.util.concurrent.FastThreadLocalRunnable.run（FastThreadLocalRunnable.java:30）在java.base / java.lang.Thread.run（Thread.java:834）造成原因： org.hibernate.hql.internal.ast.QuerySyntaxException：电影不是映射[SELECT m FROM电影AS m WHERE m.id =：id]在 org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException（QuerySyntaxException.java:79）在 org.hibernate.QueryException.wrapWithQueryString（QueryException.java:103）在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile（QueryTranslatorImpl.java:220）在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile（QueryTranslatorImpl.java:144）在 org.hibernate.engine.query.spi.HQLQueryPlan。（HQLQueryPlan.java:113）在 org.hibernate.engine.query.spi.HQLQueryPlan。（HQLQueryPlan.java:73）在 org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan（QueryPlanCache.java:158）在 org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan（AbstractSharedSessionContract.java:611）在 org.hibernate.internal.AbstractSharedSessionContract.createQuery（AbstractSharedSessionContract.java:720） ... 49更多原因： org.hibernate.hql.internal.ast.QuerySyntaxException：电影不是映射在 org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister（SessionFactoryHelper.java:169）在 org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement（FromElementFactory.java:91）在 org.hibernate.hql.internal.ast.tree.FromClause.addFromElement（FromClause.java:79）在 org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement（HqlSqlWalker.java:331）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement（HqlSqlBaseWalker.java:3695）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList（HqlSqlBaseWalker.java:3584）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause（HqlSqlBaseWalker.java:720）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query（HqlSqlBaseWalker.java:576）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement（HqlSqlBaseWalker.java:313）在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement（HqlSqlBaseWalker.java:261）在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze（QueryTranslatorImpl.java:272）在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile（QueryTranslatorImpl.java:192） ...还有55个

我的persistence.xml：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.1" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
    <persistence-unit name="default">
        <description>Persistence XML</description>
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>

            <!-- Hibernate Config -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.generate_statistics" value="false" />
            <property name="hibernate.hbm2ddl.auto" value="update"/>
            <property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy"/>
            <property name="hibernate.connection.charSet" value="UTF-8"/>
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="false"/>
            <property name="hibernate.use_sql_comments" value="false"/>

            <!-- JDBC Config -->
            <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/monolith_db" />
            <property name="javax.persistence.jdbc.user" value="monolith_user" />
            <property name="javax.persistence.jdbc.password" value="monolith_user_pwd" />

        </properties>
    </persistence-unit>
</persistence>

我正在这样调用查询：

val query = em.createQuery("SELECT m FROM Movie AS m WHERE m.id=:id", Movie::class.java)
                query.setParameter("id", 2)
                val movie = query.singleResult

我的实体：

@Entity
@Table(name = "movie")
class Movie(
    var title: String = "",
    var summary: String = ""
) : StandardEntity() {

    override fun toString(): String {
        return "Movie[id=$id, title=$title, summary=${summary.substring(0, 30)}"
    }
}

谢谢。

Answer 1

我遇到了一个非常相似的问题，并多次遇到此问题，原因是您的错误看起来与JPA提供程序的配置有关，请尝试使用spring对其进行配置，看看是否有帮助

我假设这是根本原因，因为在另一篇文章中，它告诉我Intellij由于未配置JPA提供程序而无法映射实体，因此，一旦按如下所述固定映射，它就会停止失败< / p>

在我看来，这是更愚蠢的事情，因为我在使用@Entity(name = "nameOfTheTable")时应该使用@Entity(name = "nameOfEntity"), @Table(name = "nameOfTable")

也可以尝试下一个，看看是否有帮助。尝试在@Entity中向您的实体添加自定义名称，然后使用该名称，即：

@Entity(name = "MyMovieEntity")
@Table(name = "movie")

然后尝试在查询中使用它：

val query = em.createQuery("SELECT m FROM MyMovieEntity AS m WHERE m.id=:id", Movie::class.java)
                query.setParameter("id", 2)
                val movie = query.singleResult

休眠状态：[实体]未映射

1 个答案: