在Grails 3.0.1中映射Hibernate注释 [英] Mapping with Hibernate Annotations in Grails 3.0.1

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问题描述



以下步骤对我来说不起作用。

我如何在Grails 3.0.1中映射带注解的域类？



第1步。我已经使用Grails 3.0.1创建了一个新应用程序（ grails create-app books ）。



第2步。如映射Hibernate注解中所述，我创建了一个在 src / main / com / books / Book.groovy （试过 src / main / groovy / com / books / Book.groovy ）

  package com.books; 
 import javax.persistence.Entity; 
 import javax.persistence.GeneratedValue; 
 import javax.persistence.Id; 
 
 @实体
公开课预订{
私人长ID; 
私有字符串标题; 
私有字符串描述; 
私人日期日期; 
 
 @Id 
 @GeneratedValue 
 public Long getId（）{
 return id; 
} 
 
 public void setId（Long id）{
 this.id = id; 
} 
 
 public String getTitle（）{
 return title; 
} 
 
 public void setTitle（String title）{
 this.title = title; 
} 
 
 public String getDescription（）{
 return description; 
} 
 
 public void setDescription（String description）{
 this.description = description; 
} 
}

第3步。然后通过将相关条目添加到 grails-app / conf / hibernate / hibernate.cfg.xml 文件中，使用Hibernate sessionFactory注册该类，如下所示：

 <！DOCTYPE hibernate-configuration SYSTEM 
http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd\"> ; 
< hibernate-configuration> 
< session-factory> 
< mapping package =com.books/> 
< mapping class =com.books.Book/> 
< / session-factory> 
< / hibernate-configuration>

第4步。在启动应用程序（ grails run-app ）后，'Welcome to Grails'页面（ grails-app / views / index.gsp $ b


  • grails run-app

  • 载入本地主机：8080

  • 注意'ARTEFACTS'部分下的'Domains：0'



Grails 3.0.1中的相关异常



如果我查询上面的域类，会抛出以下异常：

 原因：org.hibernate.hql.internal.ast.QuerySyntaxException：书未映射到org.hibernate.hql.internal.ast的
 .util.SessionFactoryHelper.requireClassPersister（SessionFactoryHelper.java:189）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.ast.tree。 FromElementFactory.addFromElement（FromElementFactory.java:109）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 .hibernate.hql.internal.ast.tree。 FromClause.addFromElement（FromClause.java:95）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement（HqlSqlWalker .java：332）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement（HqlSqlBaseWalker.java:3678） 〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList（HqlSqlBaseWalker.java:3567）〜[hibernate-core -4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause（HqlSqlBaseWalker.java:708）〜[hibernate-core-4.3.8。 Final.jar：4.3.8.Final] 
在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query（HqlSqlBaseWalker.java:564）〜[hibernate-core-4.3.8.Final.jar：4.3 .8.Final] 
在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement（HqlSqlBaseWalker.java:301）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.h ql.internal.antlr.HqlSqlBaseWalker.statement（HqlSqlBaseWalker.java:249）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.ast .QueryTranslatorImpl.analyze（QueryTranslatorImpl.java:278）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile（ QueryTranslatorImpl.java:206）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 ... 40个常见框架省略
   hibernate.cfg.xml 放入 c>在 grails-app / conf 而不是 grails-app / conf / hibernate 中，否则配置不会影响。我已提交拉取请求，以反映相关文档，我希望更新即将生效，以防止其他用户面临同样的问题。
 
How can I map a domain class with annotations in Grails 3.0.1?



The following steps didn't work for me.



Step 1. I have created a new application with Grails 3.0.1 (grails create-app books).



Step 2. As described in Mapping with Hibernate Annotations I have created a new class in src/main/com/books/Book.groovy (tried src/main/groovy/com/books/Book.groovy as well)
package com.books;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Book {
    private Long id;
    private String title;
    private String description;
    private Date date;

    @Id
    @GeneratedValue
    public Long getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

Step 3. Then registered the class with the Hibernate sessionFactory by adding relevant entries to the grails-app/conf/hibernate/hibernate.cfg.xml file as follows:
<!DOCTYPE hibernate-configuration SYSTEM
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <mapping package="com.books" />
        <mapping class="com.books.Book" />
    </session-factory>
</hibernate-configuration>

Step 4. After starting the application (grails run-app), the 'Welcome to Grails' page (grails-app/views/index.gsp) reports zero domain classes, which means the mapping didn't take effect:



    

  • grails run-app
    • 

  • Load localhost:8080
    • 

  • Notice the 'Domains: 0' under the section 'ARTEFACTS'
    • 




Relevant exception in Grails 3.0.1



If I query the above domain class, the following exception is thrown
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: Book is not mapped
    at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:189) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:109) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
       .hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:95) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:332) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3678) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3567) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:708) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:564) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:301) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:249) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:278) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:206) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    ... 40 common frames omitted



 解决方案 
As Graeme suggested, the solution is putting hibernate.cfg.xml in grails-app/conf instead of grails-app/conf/hibernate, otherwise the configuration will not take effect. I have submitted a pull request to reflect this in the relevant documentation and I hope the update to take effect soon so to prevent other users from facing the same issue.


                        
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