I am trying to query object without nested reference using Spring and mongo DB.
For instance
#Document
public class A {
#Id
private String id;
private String data;
#DBRef
private B b;
}
#Document
public class B {
#Id
private String id;
private String data;
}
I want to get A object without reference.
Querying A
public List<A> getAllA(String id) {
Query query = new Query();
query.addCriteria(Criteria.all());
List<A> aList = null;
aList = mongoOperations.findOne(query, A.class);
return aList;
}
Returns, I don't want to get nested b object:
[{
"_id": "AId..",
"data": "Adata..",
"b":{
"id":"BId..",
"data":"Bdata"
}
}]
Exclude fields.
Query query = new Query();
query.addCriteria(<query criteria>);
query.fields().exlude("b");
Related
I am using Elasticsearch with spring boot. A post request returns a null pointer exception, because index query is null value doesn't have index name or any things.
Look at my code
Service :
public List<Product> createProducts() {
List<Product>productList = new ArrayList<>();
for (Integer i = 0; i < 200; i++)
{
Product product = new Product();
product.setId(Long.parseLong(i.toString()));
product.setProductName(generateName());
product.setProductPrice(generatePrice());
product.setCategory(generateCategory());
if(!product.validation().equals(""))
{
throw new BadRequestAlertException(product.validation(),"Product","check input");
}
IndexQuery indexQuery=new IndexQueryBuilder().withId(i.toString()).build(); //return null
elasticsearchOperations.index(indexQuery); // here is error becouse index is null
productList.add(product);
}
return productList;
}
And this is the entity:
#JsonInclude(value = JsonInclude.Include.NON_NULL)
#Document(indexName = "product",type = "product")
public class Product implements Serializable {
private static final long serialVersionUID = 6320548148250372657L;
#Id
private Long id;
#Field(type = FieldType.Text)
private String productName;
#Field(type = FieldType.Text)
private String category;
#Field(type = FieldType.Double)
private Double productPrice;
This is the repostory:
public interface ProductSearchRepostory extends ElasticsearchRepository<Product,Long> {
List<Product> findByProductName(String name);
List<Product> findByCategory(String category);
}
You need to let the elasticsearchOperations.index method know which index to save the data in.
As per the documentation present for Spring Data Elasticsearch, in the newer versions, the index method expects an IndexCoordinates object which tells the client which index to put the data in. For the older versions ( < 4.0), this is inferred by the client based on the entity object that is being indexed.
In your code, can you please try to pass the entity while building the IndexQuery. Something like,
new IndexQueryBuilder().withId(i.toString()).withObject(product).build()
#Entity
#Table(name="cad_paciente")
#Loader(namedQuery = "selectInicial")
#NamedNativeQuery(
name="selectInicial",
query="select p.*, fu_obter_lista_convenios_pac(p.id) as ds_convenio from cad_paciente p where p.id = ?", resultClass = Paciente.class,
resultSetMapping = "sqlResult")
#SqlResultSetMapping(
name="sqlResult",
entities={
#EntityResult(entityClass = Paciente.class, fields={
#FieldResult(name="ds_convenio",column="ds_convenio")})})
public class Paciente {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotNull
#Column(name="id_empresa")
private Integer id_empresa;
...
#Transient
#Column(name="ds_convenio")
private String ds_convenio;
public String getDs_convenio() {
return ds_convenio;
}
public void setDs_convenio(String ds_convenio) {
this.ds_convenio = ds_convenio;
}
My Controller method "pacientes.findAll()" won't return "ds_convenio" field with the correct value, listing "null" always in my JSON return.
What do I have to do?
Try removing the annotation #Transient and provide the column as below :
#Column(name="ds_convenio")
private String ds_convenio;
#org.springframework.data.annotation.Transient specifically states to the spring framework that the Object Mapper you are using should not include this value when converting from Java Object to JSON. Also, it means that the value is not to be persisted into the database, which means you could not query over it.
Or if you want to keep it as transient itself but does not require the value to be serialized then register the object mapper as below :
#Bean
public ObjectMapper includeTransientObjectMapper() {
Hibernate5Module hibernate5Module = new Hibernate5Module();
hibernate5Module.disable(Hibernate5Module.Feature.USE_TRANSIENT_ANNOTATION);
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(hibernate5Module);
return mapper;
}
Or in your case since you want the result of the #NamedNativeQuer in which you aliased ds_convenio, using #FieldResult might be required to get the desired result as follows :
#Entity
#Table(name="cad_paciente")
#Loader(namedQuery = "selectInicial")
#NamedNativeQuery(name="selectInicial", query="select p.*, fu_obter_lista_convenios_pac(p.id) as ds_convenio from cad_paciente p where p.id = ?", resultClass = Paciente.class)
#SqlResultSetMapping(name="Results",
entities={
#EntityResult(entityClass=com.acme.Order.class, fields={
#FieldResult(name="id", column="id"),
#FieldResult(name="id_empresa", column="id_empresa"),
........
})
public class Paciente {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotNull
#Column(name="id_empresa")
private Integer id_empresa;
...
#Transient
#Column(name="ds_convenio")
private String ds_convenio;
Read doc
I'm beginner (sorry for my bad explanation, feel free to correct me) in MyBatis Spring-Boot, I have problem to understand and make it works #Many
I'm using 3 layer logic programming (Presentation Layer, Service Layer, Data Layer)
Thanks for your help :)
I have 3 Tables (it's TB_Products and not TB_Product as on the screenshot):
I would like to get data form table TB_Users and TB_Products to "put" it in DTO
I create 4 java object class SearchEntity, ProductEntity (for Data layer)
I create an interface SearchRepositoryMapper.
I also create a SearchService interface and SearchServiceImpl as well.
Java object class:
SearchEntity
public class SearchEntity implements Serializable{
private static final long serialVersionUID = -9143930742617602050L;
private String id;
private String firstName;
private String lastName;
private List<ProductEntity> products;
// Getters and Setters code .....
}
ProductEntity
public class ProductEntity implements Serializable{
private static final long serialVersionUID = -6525703679290992635L;
private String id;
private String productId;
private String product;
private String number;
private String date;
private String description;
// Getters and Setters code .....
}
SearchRepositoryMapper
public interface SearchRepositoryMapper {
// Get some fields from TB_Users and all fields from TB_Products
#Select("SELECT * FROM TB_Users WHERE id = #{id}")
#Results({
#Result(property = "id", column ="id"),
#Result(property = "firstName", column = "firstName"),
#Result(property = "lastName", column= "lastName"),
#Result(property = "products", javaType = List.class, column="id",
many = #Many(select = "getProductIdByUserId"))})
public SearchEntity findAllInfoByUserId(#Param("id") int id);
#Select("SELECT *, productId FROM TB_Products WHERE productId = #{id}")
public ArrayList<ProductEntity> getProductIdByUserId(#Param("id") int id);
// Find id by uderId and return null if it doesn't exist
#Select("SELECT id FROM TB_Users WHERE userId = #{userId}")
int findIdByUserId(#Param("userId") String userId);
}
SearchServiceImpl
#Service
public class SearchServiceImpl implements SearchService {
#Autowired
SearchRepositoryMapper searchRepository;
#Override
public SearchDto getAllInfoByUserId(String id) {
SearchDto returnValue = new SearchDto(); // Init returnValue as SearchDto
int searchId = searchRepository.findIdByUserId(id); // Init searchId with the TB_Users id
SearchEntity searchEntity = searchRepository.findAllInfoByUserId(searchId);
BeanUtils.copyProperties(searchEntity, returnValue);
return returnValue;
}
}
So when I execute the code and do a GET request I get this error message:
{
"message": "nested exception is org.apache.ibatis.executor.ExecutorException: Statement returned more than one row, where no more than one was expected."
}
I found out that come from the mapper and SearchEntity searchEntity = searchRepository.findAllInfoByUserId(searchId);
But i don't know how to resolve it. The way I wrote the code is wrong
Thanks to correct me
The exception clearly says that the query returns multiple results. Plese verify if the data in the table is correct.
I would like to achieve the following. I have a query and I would like to run it and return rows in a REST call.
I do not want to map the query to a physical table, how would I achieve this?
I use Spring Boot 1.5.2.
After some try and fixes, I got the following solution.
Create a POJO class, no #Entity annotation. You want to add packageScan instructions if it is not found.
public class ActivityReport1 {
#Column
private BigInteger id;
#Column
private String title;
//Only getters
public ActivityReport1(BigInteger id,
String title){
this.id = id;
this.title = title;
}
In a class which is annotated with #Entity create the resultset mapping
#SqlResultSetMappings({
#SqlResultSetMapping(name = "ActivityReport1Mapping",
classes = {
#ConstructorResult(targetClass = ActivityReport1.class, columns = {
#ColumnResult(name = "id"),
#ColumnResult(name = "title")
})
})
})
Add repository class
#Repository
#Transactional
public class IActivityReport1Repository {
#PersistenceContext
private EntityManager entityManager;
public List<ActivityReport1> getResults(String userLogin) {
Query query = entityManager.createNativeQuery(
"SELECT " +
"t.request_id as id, t.request_title as title " +
"FROM some_table t ", "ActivityReport1Mapping");
List<ActivityReport1> results = query.getResultList();
return results;
}
}
And finally, the service impl class.
#Service
#Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class ActivityReport1ServiceImpl implements IActivityReport1Service {
private static final Logger _Logger = LoggerFactory.getLogger(ActivityReport1ServiceImpl.class);
#Autowired
private IActivityReport1Repository sessionFactory;
#Override
public List<ActivityReport1> runReport(String userLogin) {
List<ActivityReport1> reportRows = sessionFactory.getResults(userLogin);
return reportRows;
}
}
If you face with "Could not locate appropriate constructor", this means that on Java side it could not map db types to java types.
In my case I had to change id from Long to BigInteger and Timestamp to java.util.date.
I'm using Spring-Data-Elastic-Search for searching/caching purposes.
I need to execute a query which uses child(TermCache) and parent(ConceptCache) properties
and return instances of child objects(this means i can't use nested objects).
i have the following structure:
#Document(indexName = "termweb" , type = "term")
public class TermCache {
#Id
private String id;
private String name;
private LanguageDTO language;
private String status;
private String definition;
#Field(type = FieldType.String, store = true)
#Parent(type = "concept")
private Long conceptId;
private String displayId;
private Map<Long, String> fields = new HashMap<>();
//todo think about storing it as a collection of nested objects
}
#Document( indexName = "termweb" , type = "concept")
public class ConceptCache implements ConceptDTO{
#Id
private String id;
private String displayId;
private Long dictionaryId;
private String dictionaryName;
private Map<Long, String> fields = new HashMap<>();
}
I need a hint on how to handle this type of tasks; should i use two separate queries or should i somehow fetch properties of a parent or maybe something else?
Agreed, We are lacking on documentation which we will be improving with upcoming release.
If you have any question about spring data elasticsearch stackoverflow probably is not best way to get answer(as we wont be notified for new thread), we have separate google group for question/queries https://groups.google.com/forum/#!forum/spring-data-elasticsearch-devs
Without having any idea about what exactly you are trying to achieve with above entities, i can give you an example of sample parent child entities as below
#Document(indexName = "parent-child", type = "parent-entity")
public class ParentEntity {
#Id
private String id;
#Field(type = FieldType.String, index = FieldIndex.analyzed, store = true)
private String name;
// setter/getter
public ParentEntity() {
}
public ParentEntity(String id, String name) {
this.id = id;
this.name = name;
}
}
#Document(indexName = "parent-child", type = "child-entity")
public class ChildEntity {
#Id
private String id;
#Field(type = FieldType.String, store = true)
#Parent(type = "parent-entity")
private String parentId;
#Field(type = FieldType.String, index = FieldIndex.analyzed, store = true)
private String name;
public ChildEntity() {
}
public ChildEntity(String id, String parentId, String name) {
this.id = id;
this.parentId = parentId;
this.name = name;
}
}
// indexing parent (you can use many other ways to index that includes using repositories)
ParentEntity parent1 = new ParentEntity("parent1", "First Parent");
IndexQuery parentIndex1 = new IndexQuery();
parentIndex1.setId(parent1.getId());
parentIndex1.setObject(parent1);
elasticsearchTemplate.index(parentIndex1);
ParentEntity parent2 = new ParentEntity("parent2", "Second Parent");
IndexQuery parentIndex2 = new IndexQuery();
parentIndex2.setId(parent2.getId());
parentIndex2.setObject(parent2);
elasticsearchTemplate.index(parentIndex2);
// indexing child
ChildEntity child1 = new ChildEntity("child1", parent1.getId(), "First");
IndexQuery childIndex1 = new IndexQuery();
childIndex1.setId(child1.getId());
childIndex1.setObject(child1);
childIndex1.setParentId(child1.getParentId());
elasticsearchTemplate.index(childIndex1);
ChildEntity child2 = new ChildEntity("child2", parent1.getId(), "Second");
IndexQuery childIndex2 = new IndexQuery();
childIndex2.setId(child2.getId());
childIndex2.setObject(child2);
childIndex2.setParentId(child2.getParentId());
elasticsearchTemplate.index(childIndex2);
// searching
there are several available option while searching on Parent/Child entities, that includes has children, has parent and top children queries.
QueryBuilder query = topChildrenQuery("child-entity", QueryBuilders.termQuery("name", child1name.toLowerCase()));
SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(query).build();
List<ParentEntity> parents = elasticsearchTemplate.queryForList(searchQuery, ParentEntity.class);
Hope this small example will give you basic understanding how to use parent child. have a look at ParentChildTests for more.
If you still have more question please feel free to contact us.
You should simply use hasparent query of filter : http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-has-parent-filter.html#query-dsl-has-parent-filter
This will make a request on parent field and result in children documents of the matching parents documents. You can then use a filter on the returned child document :)