摘要：
1.查询@Query（“selectsfromStoresjoinfetchs.productswheres.user.id=：user_id”）2.@EntityGraph（attributePaths=｛“产品”｝）3.@NamedEntityGraphs（｛@NamedEntityGraph（name=“allJoinsButMessages”，attributeNod
1. Query方式
@Query("select s from Store s join fetch s.products where s.user.id = :user_id")
2.@EntityGraph(attributePaths = { "products" })
3.@NamedEntityGraphs({
@NamedEntityGraph(name="allJoinsButMessages",attributeNodes ={@NamedAttributeNode("customer"),@NamedAttributeNode("handling_employee"),@NamedAttributeNode("genre")}),@NamedEntityGraph(name="allJoins",attributeNodes ={@NamedAttributeNode("customer"),@NamedAttributeNode("handling_employee"),@NamedAttributeNode("genre"),@NamedAttributeNode("complaintMessages")}),@NamedEntityGraph(name="noJoins",attributeNodes ={
})})