[Hibernate 的left join]Path expected for join!错误

本文详细介绍了如何在数据库中使用aleftjoin操作符结合'必须是b的父级'条件进行高效查询,特别适用于需要关联多个表并筛选特定层级关系的数据场景。

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使用条件如下:

a left join  b

a must be b's parent

转载于:https://www.cnblogs.com/timelyxyz/archive/2012/07/24/2549672.html

/** * 根据产品的bianhao、订单号number和板材ID bancaiId搜索符合条件的订单集合。 * * @param bianhao 产品编号 * @param number 订单号 * @param bancaiId 板材ID * @return 符合条件的订单集合 */ @Query("SELECT d FROM Dingdan d " + "LEFT JOIN FETCH d.dingdan_chanpins dc " + "LEFT JOIN FETCH dc.chanpin c " + "LEFT JOIN FETCH d.dingdan_chanpins_zujians dz " + "LEFT JOIN FETCH dz.bancai b " + "WHERE (c.bianhao = :bianhao OR :bianhao IS NULL) " + "AND (d.number = :number OR :number IS NULL) " + "AND (b.id = :bancaiId OR :bancaiId IS NULL)") List<Dingdan> findByCriteria( @Param("bianhao") String bianhao, @Param("number") String number, @Param("bancaiId") Integer bancaiId); org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dingdanService': Unsatisfied dependency expressed through field 'dingdanRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dingdanRepository' defined in com.kucun.dataDo.DingdanRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.kucun.dataDo.DingdanRepository.findByCriteria(java.lang.String,java.lang.String,java.lang.Integer)! at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]
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