Question

我有HQL，我试图获取没有分类的工件（活动时为0）

artifacts = Artifact.findAll("FROM Artifact WHERE id NOT IN ( SELECT artifact_id FROM Classification WHERE active = 1) AND document_id = :docid",[docid:document.id], [max:limit, offset:startIndex]);

每当我跑步时，我都会收到错误

java.lang.IllegalStateException: No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode 
 \-[IDENT] IdentNode: 'artifact_id' {originalText=artifact_id}

分类定义：

class Classification {

    public static final String USER_DEFAULT = "USER"
    public static final String USER_SYSTEM = "SYSTEM"

    TaxonomyNode node
    String artifactId 
    Boolean active
    String createdBy
    String updatedBy
    Date dateCreated
    Date lastUpdated


    static constraints = {
        node nullable:false, blank:false
        artifactId nullable:false, blank:false, unique: ['node']
        active nullable: false, blank: false
        createdBy nullable:false, blank:false
        updatedBy nullable:false, blank:false
    }

    static mapping = {
        id generator:'sequence', params:[sequence:'classification_seq']
        artifactId index: 'classify_by_artifact_node'
        node index: 'classify_by_artifact_node'
        active defaultValue: "1"
    }
}

您可以参考我之前遇到的问题，了解我到底要做什么Quest 1和Quest 2

Answer 1

SQL查询使用列名，而HQL查询使用Class属性。您从分类中选择artifact_id，但Classification类没有名为＆＃39; artifact_id＆＃39;的属性。要修复它，请在HQL中使用class属性。

SELECT artifactId FROM Classification

Answer 2

有时在DTO（数据传输对象）中缺少关键字“ new”时会发生这种情况。

没有节点的数据类型：org.hibernate.hql.internal.ast.tree.IdentNode HQL

2 个答案: