Java 基于映射键使用HQL选择值
假设我有以下JPA映射Java 基于映射键使用HQL选择值,java,hibernate,hibernate-mapping,Java,Hibernate,Hibernate Mapping,假设我有以下JPA映射 @Entity @Table(name = "transaction") public class Transaction { @ElementCollection(targetClass = String.class, fetch = FetchType.EAGER) @JoinTable(name = "trx_addi_info") private Map additionalInfo;
@Entity
@Table(name = "transaction")
public class Transaction {
@ElementCollection(targetClass = String.class, fetch = FetchType.EAGER)
@JoinTable(name = "trx_addi_info")
private Map additionalInfo;
}
我想编写HQL来获取additionalInfo映射中具有特定键值对的所有事务。我想我必须做一个如下的连接
SELECT trx FROM Transaction trx inner join trx.additionalInfo addInfo WHERE addInfo.????
但我不清楚如何在additionalInfo映射中放置WHERE子句以与特定的键值对匹配。有人能帮我吗
提前感谢。您需要使用HQL
index()
特定函数,该函数适用于已加入索引的集合(数组、列表和映射)的别名。请参阅Hibernate参考文档的一节
//Example of HQL returning `Transaction` object that have `additianlInfo` with
//the `KEY` equal to the string `test`
SELECT trx FROM Transaction trx inner join trx.additionalInfo addInfo WHERE index(addInfo) > 'test'