Question

我想从数据库视图中选择执行大量有用计算的记录。我首先将以下片段添加到//= require jquery //= require jquery_ujs //= require jquery.mask.min.js文件中：

.reveg.xml

逆向工程正在生成此<table-filter match-name="v_candidate" /> <table name="v_candidate"> <primary-key> <key-column name="id"/> </primary-key> </table>文件：

VCandidate.hbm.xml

以下<?xml version="1.0"?> <!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="db.VCandidate" table="v_candidate" optimistic-lock="version"> <id name="id" type="java.lang.Integer"> <column name="id" /> <generator class="assigned" /> </id> <property name="outflowElevation" type="big_decimal"> <column name="outflow_elevation" precision="131089" scale="0" /> </property> <property name="name" type="string"> <column name="name" /> </property> <property name="floodedVolume" type="java.lang.Double"> <column name="flooded_volume" precision="17" scale="17" /> </property> <property name="servedArea" type="big_decimal"> <column name="served_area" precision="131089" scale="0" /> </property> </class> </hibernate-mapping>课程：

VCandidate

然后我尝试从此视图中检索可用的记录：

package db;
// Generated Mar 23, 2016 12:12:19 PM by Hibernate Tools 4.3.1.Final

import java.io.Serializable;
import java.math.BigDecimal;

/**
 * VCandidate generated by hbm2java
 */
public class VCandidate implements java.io.Serializable {

    private Integer id;
    private BigDecimal outflowElevation;
    private String name;
    private Double floodedVolume;
    private BigDecimal servedArea;

    public VCandidate() {
    }

    public VCandidate(Integer id) {
        this.id = id;
    }

    public VCandidate(Integer id, BigDecimal outflowElevation, String name, Double floodedVolume, BigDecimal servedArea) {
        this.id = id;
        this.outflowElevation = outflowElevation;
        this.name = name;
        this.floodedVolume = floodedVolume;
        this.servedArea = servedArea;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public BigDecimal getOutflowElevation() {
        return this.outflowElevation;
    }

    public void setOutflowElevation(BigDecimal outflowElevation) {
        this.outflowElevation = outflowElevation;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getFloodedVolume() {
        return this.floodedVolume;
    }

    public void setFloodedVolume(Double floodedVolume) {
        this.floodedVolume = floodedVolume;
    }

    public BigDecimal getServedArea() {
        return this.servedArea;
    }

    public void setServedArea(BigDecimal servedArea) {
        this.servedArea = servedArea;
    }
}

这会立即产生熟悉的异常：

Query query =  session.createQuery("from VCandidate");

为此视图生成的Exception in thread "main" org.hibernate.hql.internal.ast.QuerySyntaxException: VCandidate is not mapped [from VCandidate] at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76) at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150) at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:302) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:240) at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1894) at opt.Main.plotData(Main.java:66) at opt.Main.main(Main.java:90) Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: VCandidate is not mapped at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:171) at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:76) at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:321) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3701) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3590) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:716) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:572) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:309) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:257) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190) ... 9 more和.hbm.xml文件遵循与为表生成的文件几乎相同的模式。但是对于表格，我没有检索记录的问题。

我错过了什么？

Answer 1

我通过使用本机查询而不是使用HQL来实现它。像这样：

Query query = session.createSQLQuery(
    "select * from v_candidate")
    .addEntity(VCandidate.class);
List<VCandidate> candidates = query.list();

这是一种解决方法，而不是其他任何方法，但现在它可以很好地完成工作。

具有反向工程视图的QuerySyntaxException

1 个答案: