HQL 无法查询 JSON 条数据

Question

这是一个 NativeSql 工作正常： session.createSQLQuery(select json_length(fav_goods) from customer where id=1).uniqueResult()

但是如果我像这样将它更改为 HQL，它就会引发错误 session.createQuery(select json_length(favGoods) from CustomerEntity where id=1).uniqueResult()

错误

Caused by: org.hibernate.QueryException: No data type for node: org.hibernate.hql.internal.ast.tree.MethodNode 
 \-[METHOD_CALL] MethodNode: '('
    +-[METHOD_NAME] IdentNode: 'json_length' {originalText=json_length}
    \-[EXPR_LIST] SqlNode: 'exprList'
       \-[DOT] DotNode: 'customeren0_.fav_goods' {propertyName=favGoods,dereferenceType=PRIMITIVE,getPropertyPath=favGoods,path={synthetic-alias}.favGoods,tableAlias=customeren0_,className=cn.phyer.bishe.entity.CustomerEntity,classAlias=null}
          +-[IDENT] IdentNode: '{synthetic-alias}' {originalText={synthetic-alias}}
          \-[IDENT] IdentNode: 'favGoods' {originalText=favGoods}
 [select json_length(favGoods) from cn.phyer.bishe.entity.CustomerEntity where id=?1]
    at org.hibernate.QueryException.generateQueryException(QueryException.java:120)
    at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:220)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:144)
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:113)
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:73)
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:155)
    at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:600)
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:709)
    ... 39 more
Caused by: org.hibernate.QueryException: No data type for node: org.hibernate.hql.internal.ast.tree.MethodNode 
 \-[METHOD_CALL] MethodNode: '('
    +-[METHOD_NAME] IdentNode: 'json_length' {originalText=json_length}
    \-[EXPR_LIST] SqlNode: 'exprList'
       \-[DOT] DotNode: 'customeren0_.fav_goods' {propertyName=favGoods,dereferenceType=PRIMITIVE,getPropertyPath=favGoods,path={synthetic-alias}.favGoods,tableAlias=customeren0_,className=cn.phyer.bishe.entity.CustomerEntity,classAlias=null}
          +-[IDENT] IdentNode: '{synthetic-alias}' {originalText={synthetic-alias}}
          \-[IDENT] IdentNode: 'favGoods' {originalText=favGoods}

在实体 class CustomerEntity，字段 fav_goods 被命名为 favGoods

Answer 1

JPQL（或 HQL）不支持 JSON 函数。

请在此处查找所有支持的函数：

https://docs.jboss.org/hibernate/orm/5.4/userguide/html_single/Hibernate_User_Guide.html#hql-functions

你必须坚持 SQL。

Answer 2

我遇到了类似的问题，我不得不使用 JSON_EXTRACT mysql 函数。

扩展 MySQL5Dialect class 以在 Hibernate 中注册 SQL 函数。

public class CustomMySQLDialect extends MySQL5Dialect {
    public CustomMySQLDialect(){
        super();
        registerFunction(
                "JSON_EXTRACT",
                new StandardSQLFunction(
                        "JSON_EXTRACT",
                        StandardBasicTypes.STRING
                )
        );
    }
}

在 Hibernate cfg 中注册自定义 MySQL 方言 xml

<property name="hibernate.dialect">com.testsigma.specification.CustomMySQLDialect</property>

在 Hibernate 中使用 CriteriaQuery(JPQL) 和 SQL 函数。

Root<EntityType> subRoot = criteriaBuilder.from(Entity.class);
subQuery.select(builder.function("JSON_EXTRACT", String.class, subRoot.get("jsonData"), builder.literal("$.\"jsonPathField\"")));
query1.where(root.get("jsonKey").in(subQuery));

取自https://vladmihalcea.com/hibernate-sql-function-jpql-criteria-api-query/

从 Hibernate 5.2 开始工作。3.Final，Spring Data JPA 2.1。9.RELEASE

HQL 无法查询 JSON 条数据

HQL cannot query JSON data

mysql

json

hibernate

hql