sqlresultsetmapping | 易学教程

jpa native query retrieve multiple entities

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问题 I have a database with 4 tables: company,staff,department,project Company.java @Entity @Table(name = "company") @SqlResultSetMapping(name = "COMPANY", entities = { @EntityResult(entityClass = Company.class), @EntityResult(entityClass = Staff.class) }) ... GetEntity.java EntityManagerFactory emf = Persistence.createEntityManagerFactory("GetEntityPU"); EntityManager em = emf.createEntityManager(); String query = "SELECT * FROM company c JOIN staff s ON c.ID = s.companyID"; Query q = em

jpa native query retrieve multiple entities

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@ConstructorResult with Enum in JPA 2.1

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问题 I am not having any idea how to use Enum in @ColumnResult Type while using @ConstructorResult of @SqlResultSetMapping @SqlResultSetMapping(name="DetailAndResult", classes={ @ConstructorResult(targetClass=DetailAndResult.class, columns={ @ColumnResult(name="id", type= String.class), @ColumnResult(name="runId", type=Integer.class), @ColumnResult(name="subRunId", type=Integer.class), @ColumnResult(name="transactionId", type=Integer.class), @ColumnResult(name="referenceNumber", type=String.class)

@NamedNativeQuery with @SqlResultSetMapping for non-entity

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问题 I have been using this post as an example. I have a complex join query (simplified here). It returns a subset of values from two tables (and a derived column using CASE). I don't think I need to use an entity annotation because the object returned from my result set is not an actual table in my schema. My non-entity object that I want to hold results from my join query: @SqlResultSetMapping( name="myMapping", classes={ @ConstructorResult( targetClass=CarLimitDelta.class, columns={

JPA 2.1 ConstructorResult Causing ClassCastException

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问题 The objects in my resultset are being cast to 'Object' instead of what I specified in the @SQLResultSetMapping objects. I'm trying to get a handle on ConstructorResult and have created a query which contains a simple join and am trying to get the result set and loop though it printing it out to make sure I have it right. However when I get to the loop what looks like it should be straight forward isn't. When I declare the result list it is cast to be of type . I step through the query test

@ConstructorResult with Enum in JPA 2.1

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I am not having any idea how to use Enum in @ColumnResult Type while using @ConstructorResult of @SqlResultSetMapping @SqlResultSetMapping(name="DetailAndResult", classes={ @ConstructorResult(targetClass=DetailAndResult.class, columns={ @ColumnResult(name="id", type= String.class), @ColumnResult(name="runId", type=Integer.class), @ColumnResult(name="subRunId", type=Integer.class), @ColumnResult(name="transactionId", type=Integer.class), @ColumnResult(name="referenceNumber", type=String.class), @ColumnResult(name="customerName", type=String.class), @ColumnResult(name="transactionType", type

@NamedNativeQuery with @SqlResultSetMapping for non-entity

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I have been using this post as an example. I have a complex join query (simplified here). It returns a subset of values from two tables (and a derived column using CASE). I don't think I need to use an entity annotation because the object returned from my result set is not an actual table in my schema. My non-entity object that I want to hold results from my join query: @SqlResultSetMapping( name="myMapping", classes={ @ConstructorResult( targetClass=CarLimitDelta.class, columns={ @ColumnResult(name="caseCol"), @ColumnResult(name="colA"), @ColumnResult(name="colB"), } ) } ) @NamedNativeQuery

SqlResultSetMapping columns as and entities

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问题 I am really confused, how does column resultset mapping work? What am I mapping when I use columns instead of entities? Look at this example... Query q = em.createNativeQuery( "SELECT o.id AS order_id, " + "o.quantity AS order_quantity, " + "o.item AS order_item, " + "i.name AS item_name, " + "FROM Order o, Item i " + "WHERE (order_quantity > 25) AND (order_item = i.id)", "OrderResults"); @SqlResultSetMapping(name="OrderResults", entities={ @EntityResult(entityClass=com.acme.Order.class,

ParameterizedRowMapper That Maps Object List to Object

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问题 I am trying to set the Parent List in a ParameterizedRowMapper how is this written or approached. I have two Objects one for parent and one for children however children contains a ListThe parents for each child are stored in a separate table in the database and the mapping is 1 - many. The select for the records for the parents will be done in a separate ResultSet. Will the mapping have to be done separately ( separate ParameterizedRowMapper ), if so how will i have to write the

JPA Data Repositories with SqlResultSetMapping and native queries

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问题 I was stuck with the following situation: My entities are related to each other, but in such a way that i could not use JPQL. I was forced to use native SQL. Now I want to map these results to a ValueObject. To be clear, I don't want to get a list of Object array ( List<Object[]> ). I have 6 entities from which I need only some columns. Can anybody give me an example on how to implement such a mapping from a native query? Tutorial that I went through. My code: @SqlResultSetMapping( name =