search item in hibernate query (select two tables) - java

Im having a trouble with my code. i have a view jsp where i can view all items.
When i try to search for a name. It will loop or have a redundancy. I dont know why. looks like this.
BTW i have two tables and a foreign key product[pid] to stock[pid]
public class Product {
#Id
#Column(name="p_id")
private String pid;
#Column(name="p_name")
private String p_name;
#Column(name="c_name")
private String c_name;
#Column(name="b_name")
private String b_name;
//SETTERS & GETTERS
public class Stock {
#Id
#Column(name="s_id")
private int sid;
#Column(name="p_id")
private String pid;
#Column(name="s_quantity")
private String squantity;
#Column(name="s_price")
private String sprice;
#Column(name="s_cost")
private String cost;
//SETTERS AND GETTERS
#Controller
#RequestMapping(method = RequestMethod.POST, value = "/searchItem")
public String searchItem(HttpServletRequest request, ModelMap map,
#RequestParam(value = "page", required = false) Integer page,
#RequestParam(value = "size", required = false) Integer size ) {
String searchProductName = request.getParameter("productName");
String cat = request.getParameter("category");
String bran = request.getParameter("brand");
Product searchProduct = new Product();
searchProduct.setP_name(searchProductName);
searchProduct.setC_name(cat);
searchProduct.setB_name(bran);
int pageSize = (size != null && size != 0) ? size : 25;
int firstResultIndex = (page != null && page > 0) ? (page - 1) * pageSize : 0;
List<Product> productList = catService.getUsers(searchProduct, firstResultIndex, pageSize);
map.addAttribute("productList", productList);
List<Category> cList = catService.getCat();
map.addAttribute("cList", cList);
List<Brand> bList = catService.getBrand();
map.addAttribute("bList", bList);
return "new/list";
}
#DaoImpl
#SuppressWarnings("unchecked")
#Override
public List<Product> getUsers(Product searchProduct, int startPage, int maxResults) {
EntityManager entityManager = transactionManager.getEntityManagerFactory().createEntityManager();
Session session = entityManager.unwrap(Session.class);
SQLQuery query = session.createSQLQuery("FROM product,stock");
boolean paramExists = false;
if (!StringUtility.isStringNullOrEmpty(searchProduct.getC_name())&&!StringUtility.isStringNullOrEmpty(searchProduct.getB_name())) {
//sqlQuerySB.append(" product.c_name LIKE :category AND product.b_name LIKE :brand");
query = session.createSQLQuery("FROM product,stock WHERE product.c_name LIKE :category AND product.b_name LIKE :brand");
paramExists = true;
}
if (!StringUtility.isStringNullOrEmpty(searchProduct.getP_name())) {
query = session.createSQLQuery("SELECT product.p_name,product.c_name,product.b_name,stock.s_quantity,stock.s_price,stock.s_cost FROM product,stock WHERE product.p_name LIKE :productName");
query.setParameter("productName", "%" + searchProduct.getP_name() + "%");
paramExists = true;
}
if (!StringUtility.isStringNullOrEmpty(searchProduct.getC_name())) {
query = session.createSQLQuery("SELECT product.p_name,product.c_name,product.b_name,stock.s_quantity,stock.s_price,stock.s_cost FROM product,stock WHERE product.c_name LIKE :category ");
query.setParameter("category", "" + searchProduct.getC_name() + "");
paramExists = true;
}
query.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);
List<Product> productList = query.list();
if (entityManager.isOpen())
entityManager.close();
return productList;
}
maybe there is a big problem in my DAOimpl on how i query two tables..
need some help/advice. ty.


You are not specifying the join criteria between product and stock:
SELECT
product.p_name,
product.c_name,
product.b_name,
stock.s_quantity,
stock.s_price,
stock.s_cost
FROM product, stock
WHERE product.p_name LIKE :productName
In this case it will return one row for each for each combination of product (with the name) and stock (full table since it does not have any criteria).
Try to specify the join criteria:
SELECT
product.p_name,
product.c_name,
product.b_name,
stock.s_quantity,
stock.s_price,
stock.s_cost
FROM product, stock
WHERE
product.pid = stock.pid
product.p_name LIKE :productName

Related

How to fix missing descriptor for class POJO after update server? [duplicate]

I'm using EclipseLink to run some Native SQL. I need to return the data into a POJO. I followed the instructions at EclipseLink Docs, but I receive the error Missing descriptor for [Class]
The query columns have been named to match the member variables of the POJO. Do I need to do some additional mapping?
POJO:
public class AnnouncementRecipientsFlattenedDTO {
private BigDecimal announcementId;
private String recipientAddress;
private String type;
public AnnouncementRecipientsFlattenedDTO() {
super();
}
public AnnouncementRecipientsFlattenedDTO(BigDecimal announcementId, String recipientAddress, String type) {
super();
this.announcementId = announcementId;
this.recipientAddress = recipientAddress;
this.type = type;
}
... Getters/Setters
Entity Manager call:
public List<AnnouncementRecipientsFlattenedDTO> getNormalizedRecipientsForAnnouncement(int announcementId) {
Query query = em.createNamedQuery(AnnouncementDeliveryLog.FIND_NORMALIZED_RECIPIENTS_FOR_ANNOUNCEMENT, AnnouncementRecipientsFlattenedDTO.class);
query.setParameter(1, announcementId);
return query.getResultList();
}

I found out you can put the results of a Native Query execution into a List of Arrays that hold Objects. Then one can iterate over the list and Array elements and build the desired Entity objects.
List<Object[]> rawResultList;
Query query =
em.createNamedQuery(AnnouncementDeliveryLog.FIND_NORMALIZED_RECIPIENTS_FOR_ANNOUNCEMENT);
rawResultList = query.getResultList();
for (Object[] resultElement : rawResultList) {
AnnouncementDeliveryLog adl = new AnnouncementDeliveryLog(getAnnouncementById(announcementId), (String)resultElement[1], (String)resultElement[2], "TO_SEND");
persistAnnouncementDeliveryLog(adl);
}

You can only use native SQL queries with a class if the class is mapped. You need to define the AnnouncementRecipientsFlattenedDTO class as an #Entity.
Otherwise just create the native query with only the SQL and get an array of the data back and construct your DTO yourself using the data.

Old question but may be following solution will help someone else.
Suppose you want to return a list of columns, data type and data length for a given table in Oracle. I have written below a native sample query for this:
private static final String TABLE_COLUMNS = "select utc.COLUMN_NAME, utc.DATA_TYPE, utc.DATA_LENGTH "
+ "from user_tab_columns utc "
+ "where utc.table_name = ? "
+ "order by utc.column_name asc";
Now the requirement is to construct a list of POJO from the result of above query.
Define TableColumn entity class as below:
#Entity
public class TableColumn implements Serializable {
#Id
#Column(name = "COLUMN_NAME")
private String columnName;
#Column(name = "DATA_TYPE")
private String dataType;
#Column(name = "DATA_LENGTH")
private int dataLength;
public String getColumnName() {
return columnName;
}
public void setColumnName(String columnName) {
this.columnName = columnName;
}
public String getDataType() {
return dataType;
}
public void setDataType(String dataType) {
this.dataType = dataType;
}
public int getDataLength() {
return dataLength;
}
public void setDataLength(int dataLength) {
this.dataLength = dataLength;
}
public TableColumn(String columnName, String dataType, int dataLength) {
this.columnName = columnName;
this.dataType = dataType;
this.dataLength = dataLength;
}
public TableColumn(String columnName) {
this.columnName = columnName;
}
public TableColumn() {
}
#Override
public int hashCode() {
int hash = 0;
hash += (columnName != null ? columnName.hashCode() : 0);
return hash;
}
#Override
public boolean equals(Object object) {
if (!(object instanceof TableColumn)) {
return false;
}
TableColumn other = (TableColumn) object;
if ((this.columnName == null && other.columnName != null) || (this.columnName != null && !this.columnName.equals(other.columnName))) {
return false;
}
return true;
}
#Override
public String toString() {
return getColumnName();
}
}
Now we are ready to construct a list of POJO. Use the sample code below to construct get your result as List of POJOs.
public List<TableColumn> findTableColumns(String table) {
List<TableColumn> listTables = new ArrayList<>();
EntityManager em = emf.createEntityManager();
Query q = em.createNativeQuery(TABLE_COLUMNS, TableColumn.class).setParameter(1, table);
listTables = q.getResultList();
em.close();
return listTables;
}

Also, don't forget to add in your POJO class in persistence.xml! It can be easy to overlook if you are used to your IDE managing that file for you.

Had the same kind of problem where I wanted to return a List of POJOs, and really just POJOs (call it DTO if you want) and not #Entity annotated Objects.
class PojoExample {
String name;
#Enumerated(EnumType.STRING)
SomeEnum type;
public PojoExample(String name, SomeEnum type) {
this.name = name;
this.type = type;
}
}
With the following Query:
String query = "SELECT b.name, a.newtype as type FROM tablea a, tableb b where a.tableb_id = b_id";
Query query = getEntityManager().createNativeQuery(query, "PojoExample");
#SuppressWarnings("unchecked")
List<PojoExample> data = query.getResultList();
Creates the PojoExample from the database without the need for an Entity annotation on PojoExample. You can find the method call in the Oracle Docs here.
edit:
As it turns out you have to use #SqlResultSetMapping for this to work, otherwise your query.getResultList() returns a List of Object.
#SqlResultSetMapping(name = "PojoExample",
classes = #ConstructorResult(columns = {
#ColumnResult(name = "name", type = String.class),
#ColumnResult(name = "type", type = String.class)
},
targetClass = PojoExample.class)
)
Just put this anywhere under your #Entity annotation (so in this example either in tablea or tableb because PojoExample has no #Entity annotation)

How to implement Server-side processing of DataTables with JDBC so that it paginates?

I have a Spring Boot app with DataTables server-side processing and Oracle database. Actually, I started with implementing one of the tutorials. It worked. The tutorial uses JPA. I want to implement the same using JDBC. I made all the corresponding classes, the repository, the new model with same filds but without jpa. But when I tried to fetch the data, it allowed me to get only the first page without a chance to get to the second page. Below I will post the extracts of the original and added code. So, the original tutorial used these classes:
#Entity
#Table(name = "MYUSERS")
public class User {
#Id
#Column(name = "USER_ID")
private Long id;
#Column(name = "USER_NAME")
private String name;
#Column(name = "SALARY")
private String salary;
...getters and setters
}
And
#Entity
public class UserModel {
#Id
private Long id;
private String name;
private String salary;
private Integer totalRecords;
#Transient
private Integer rn;
...getters and setters
}
And I substituted these two classes with one like this:
public class NewUser {
private Long id;
private String name;
private String salary;
private Integer totalRecords;
private Integer rn;
...getters and setters
}
The table itself has only 3 fields: id, name and salary, the other 2 fields are created and filled later.
The repositiry the original Author has for the user looks like this:
public interface UserRepository extends JpaRepository<User, Long> {
#Query(value = "SELECT * FROM MYUSERS", nativeQuery = true)
List<User> findAllByUsernames(List<String> listOfUsernames);
}
My own repository looks like this:
#Repository
public class NewUserRepoImpl extends JdbcDaoSupport implements NewUserRepo {
private static final String SELECT_ALL_SQL = "SELECT USER_ID as id, USER_NAME as name, SALARY as salary FROM MYUSERS";
private final NamedParameterJdbcTemplate namedParameterJdbcTemplate;
private final JdbcTemplate jdbctemplate;
public NewUserRepoImpl(NamedParameterJdbcTemplate namedParameterJdbcTemplate, JdbcTemplate jdbctemplate, DataSource dataSource) {
this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
this.jdbctemplate = jdbctemplate;
setDataSource(dataSource);
}
#Override
public List<NewUser> findAll(PaginationCriteria pagination) {
try {
String paginatedQuery = AppUtil.buildPaginatedQueryForOracle(SELECT_ALL_SQL, pagination);
return jdbctemplate.query(paginatedQuery, newUserRowMapper());
} catch (DataAccessException e) {
throw new EntityNotFoundException("No Entities Found");
}
}
#Bean
public RowMapper<NewUser> newUserRowMapper() {
return (rs, i) -> {
final NewUser newUser = new NewUser();
newUser.setId(rs.getLong("ID"));
newUser.setName(rs.getString("NAME"));
newUser.setSalary(rs.getString("SALARY"));
newUser.setTotalRecords(rs.getInt("TOTAL_RECORDS"));
newUser.setTotalRecords(rs.getInt("RN"));
return newUser;
};
}
}
the buildPaginatedQueryForOracle thing transforms my Query and allows it to get the totalRecords and rn. Below I will post the output of it both for the orifinal and my queries (they are the same, I checked).
So, the main part, the controller. I left the old and new pieces in it for now for debug purposes and just returning one of the results:
#RequestMapping(value="/users/paginated/orcl", method=RequestMethod.GET)
#ResponseBody
public String listUsersPaginatedForOracle(HttpServletRequest request, HttpServletResponse response, Model model) {
DataTableRequest<User> dataTableInRQ = new DataTableRequest<User>(request);
System.out.println(new Gson().toJson(dataTableInRQ));
DataTableRequest<NewUser> dataTableInRQNew = new DataTableRequest<NewUser>(request);
System.out.println(new Gson().toJson(dataTableInRQNew));
PaginationCriteria pagination = dataTableInRQ.getPaginationRequest();
System.out.println(new Gson().toJson(pagination));
PaginationCriteria paginationNew = dataTableInRQNew.getPaginationRequest();
System.out.println(new Gson().toJson(paginationNew));
String baseQuery = "SELECT USER_ID as id, USER_NAME as name, SALARY as salary FROM MYUSERS";
String paginatedQuery = AppUtil.buildPaginatedQueryForOracle(baseQuery, pagination);
String paginatedQueryNew = AppUtil.buildPaginatedQueryForOracle(baseQuery, paginationNew);
System.out.println(paginatedQuery);
System.out.println(paginatedQueryNew);
Query query = entityManager.createNativeQuery(paginatedQuery, UserModel.class);
System.out.println("Query:");
System.out.println(query);
#SuppressWarnings("unchecked")
List<UserModel> userList = query.getResultList();
System.out.println(new Gson().toJson(userList));
#SuppressWarnings("unchecked")
List<NewUser> userListNew = newUserRepo.findAll(paginationNew);
System.out.println(new Gson().toJson(userListNew));
DataTableResults<UserModel> dataTableResult = new DataTableResults<UserModel>();
DataTableResults<NewUser> dataTableResultNew = new DataTableResults<NewUser>();
dataTableResult.setDraw(dataTableInRQ.getDraw());
dataTableResultNew.setDraw(dataTableInRQNew.getDraw());
dataTableResult.setListOfDataObjects(userList);
dataTableResultNew.setListOfDataObjects(userListNew);
if (!AppUtil.isObjectEmpty(userList)) {
dataTableResult.setRecordsTotal(userList.get(0).getTotalRecords()
.toString());
if (dataTableInRQ.getPaginationRequest().isFilterByEmpty()) {
dataTableResult.setRecordsFiltered(userList.get(0).getTotalRecords()
.toString());
} else {
dataTableResult.setRecordsFiltered(Integer.toString(userList.size()));
}
}
if (!AppUtil.isObjectEmpty(userListNew)) {
dataTableResultNew.setRecordsTotal(userListNew.get(0).getTotalRecords()
.toString());
if (dataTableInRQ.getPaginationRequest().isFilterByEmpty()) {
dataTableResultNew.setRecordsFiltered(userListNew.get(0).getTotalRecords()
.toString());
} else {
dataTableResultNew.setRecordsFiltered(Integer.toString(userListNew.size()));
}
}
System.out.println(new Gson().toJson(dataTableResult));
System.out.println(new Gson().toJson(dataTableResultNew));
return new Gson().toJson(dataTableResult);
}
So, I log out everything possible in the console. Here is the output:
{"uniqueId":"1579786571491","draw":"1","start":0,"length":5,"search":"","regex":false,"columns":[{"index":0,"data":"id","name":"ID","searchable":true,"orderable":true,"search":"","regex":false,"sortDir":"ASC"},{"index":1,"data":"name","name":"Name","searchable":true,"orderable":true,"search":"","regex":false},{"index":2,"data":"salary","name":"Salary","searchable":true,"orderable":true,"search":"","regex":false}],"order":{"index":0,"data":"id","name":"ID","searchable":true,"orderable":true,"search":"","regex":false,"sortDir":"ASC"},"isGlobalSearch":false,"maxParamsToCheck":3}
{"uniqueId":"1579786571491","draw":"1","start":0,"length":5,"search":"","regex":false,"columns":[{"index":0,"data":"id","name":"ID","searchable":true,"orderable":true,"search":"","regex":false,"sortDir":"ASC"},{"index":1,"data":"name","name":"Name","searchable":true,"orderable":true,"search":"","regex":false},{"index":2,"data":"salary","name":"Salary","searchable":true,"orderable":true,"search":"","regex":false}],"order":{"index":0,"data":"id","name":"ID","searchable":true,"orderable":true,"search":"","regex":false,"sortDir":"ASC"},"isGlobalSearch":false,"maxParamsToCheck":3}
{"pageNumber":0,"pageSize":5,"sortBy":{"mapOfSorts":{"id":"ASC"}},"filterBy":{"mapOfFilters":{},"globalSearch":false}}
{"pageNumber":0,"pageSize":5,"sortBy":{"mapOfSorts":{"id":"ASC"}},"filterBy":{"mapOfFilters":{},"globalSearch":false}}
SELECT * FROM (SELECT FILTERED_ORDERED_RESULTS.*, COUNT(1) OVER() total_records, ROWNUM AS RN FROM (SELECT BASEINFO.* FROM ( SELECT USER_ID as id, USER_NAME as name, SALARY as salary FROM MYUSERS ) BASEINFO ) FILTERED_ORDERED_RESULTS ORDER BY id ASC ) WHERE RN > (0 * 5) AND RN <= (0 + 1) * 5
SELECT * FROM (SELECT FILTERED_ORDERED_RESULTS.*, COUNT(1) OVER() total_records, ROWNUM AS RN FROM (SELECT BASEINFO.* FROM ( SELECT USER_ID as id, USER_NAME as name, SALARY as salary FROM MYUSERS ) BASEINFO ) FILTERED_ORDERED_RESULTS ORDER BY id ASC ) WHERE RN > (0 * 5) AND RN <= (0 + 1) * 5
Query:
org.hibernate.query.internal.NativeQueryImpl#3ea49a4
[{"id":3,"name":"user3","salary":"300","totalRecords":18},{"id":4,"name":"user4","salary":"400","totalRecords":18},{"id":5,"name":"user5","salary":"500","totalRecords":18},{"id":6,"name":"user6","salary":"600","totalRecords":18},{"id":7,"name":"user7","salary":"700","totalRecords":18}]
[{"id":3,"name":"user3","salary":"300","totalRecords":1},{"id":4,"name":"user4","salary":"400","totalRecords":2},{"id":5,"name":"user5","salary":"500","totalRecords":3},{"id":6,"name":"user6","salary":"600","totalRecords":4},{"id":7,"name":"user7","salary":"700","totalRecords":5}]
{"draw":"1","recordsFiltered":"18","recordsTotal":"18","data":[{"id":3,"name":"user3","salary":"300","totalRecords":18},{"id":4,"name":"user4","salary":"400","totalRecords":18},{"id":5,"name":"user5","salary":"500","totalRecords":18},{"id":6,"name":"user6","salary":"600","totalRecords":18},{"id":7,"name":"user7","salary":"700","totalRecords":18}]}
{"draw":"1","recordsFiltered":"1","recordsTotal":"1","data":[{"id":3,"name":"user3","salary":"300","totalRecords":1},{"id":4,"name":"user4","salary":"400","totalRecords":2},{"id":5,"name":"user5","salary":"500","totalRecords":3},{"id":6,"name":"user6","salary":"600","totalRecords":4},{"id":7,"name":"user7","salary":"700","totalRecords":5}]}
It helped me realize that:
DataTableRequest incoming from the back is the same for both jpa
and jdbc
PaginationCriteria are also the same
paginatedQuery
having been made with the method specified above are the same.
Differences are already seen in the Lists: where the Jpa list
retrieved with native Query has totalRecords as 18 for every row,
the JDBC repo with the same query returns 1,2,3... for every
subsequent row.
It made me think that I should look at the Query made for JPA. But, as you see in the log, System.out.println wasn't able to decipher it for some reason.
Any advice on how to decipher it and more importantly how to get the right total result for each row would be greatly appreciated!!!

JPA returning empty result list while DB returns row set

I am trying to run a query to fetch some statistic data from my database. And I'm using JPA. But I faced such a trouble: when I run JPQL query, the empty result set is returned. But when I run SQL, produced with JPA for that JPQL query, I got a single row of data.
Here's what I've got:
The Ticket entity
#Entity
#Table(name="tickets")
public class Ticket extends AbstractEntity {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
#Embedded
private Owner owner;
#ManyToOne
#JoinColumn(name="flightId")
private Flight flight;
private String status;
public Ticket() {
this.status = "AVAILABLE";
}
The Flight entity
#Entity
#Table(name="flights")
public class Flight extends AbstractEntity {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String departure;
private String destination;
private Date date;
private float ticketCost;
#OneToMany(mappedBy="flight", fetch=FetchType.LAZY, cascade=CascadeType.ALL)
private List<Ticket> tickets = new ArrayList<Ticket>();
The result row class
public class SoldReportRow {
private String departure;
private String destination;
private DateTime date;
private int ticketsSold;
private float totalCost;
public SoldReportRow(Date date, String departure, String destination, Long ticketsSold, Double totalCost) {
this.departure = departure;
this.destination = destination;
this.ticketsSold = ticketsSold.intValue();
this.totalCost = totalCost.floatValue();
this.date = new DateTime(date);
}
The JPQL
SELECT NEW entities.SoldReportRow(f.date, f.departure, f.destination,
COUNT(t.id), SUM(f.ticketCost))
FROM Ticket t JOIN t.flight f
WHERE t.status = 'SOLD' AND t.owner IS NOT NULL AND f.date BETWEEN ? and ?
GROUP BY f.id
The generated SQL
SELECT t0.DATE, t0.DEPARTURE, t0.DESTINATION, COUNT(t1.ID), SUM(t0.TICKETCOST)
FROM flights t0, tickets t1
WHERE ((((t1.STATUS = ?) AND NOT ((((((t1.ADDRESS IS NULL)
AND (t1.EMAIL IS NULL)) AND (t1.NAME IS NULL)) AND (t1.OWNERFROM IS NULL))
AND (t1.PHONE IS NULL)))) AND (t0.DATE BETWEEN ? AND ?))
AND (t0.ID = t1.flightId)) GROUP BY t0.ID
So here is what I got when I run JPQL:
And here is what I got when I run the generated SQL:
UPD: the TicketDAO methods
// ...
protected static EntityManagerFactory factory;
protected static EntityManager em;
static {
factory = Persistence.createEntityManagerFactory(UNIT_NAME);
}
// ...
public static List<SoldReportRow> soldReportByDate(String from, String to) {
DateTimeFormatter dfTxt = DateTimeFormat.forPattern("dd/MM/yyyy");
DateTimeFormatter dfSql = DateTimeFormat.forPattern("yyyy-MM-dd");
String startDate = dfSql.print(dfTxt.parseDateTime(from));
String endDate = dfSql.print(dfTxt.parseDateTime(to));
String query = String.format(
"SELECT NEW entities.SoldReportRow(f.date, f.departure, f.destination, COUNT(t.id), SUM(f.ticketCost)) FROM " +
"Ticket t JOIN t.flight f " +
"WHERE t.status = 'SOLD' AND t.owner IS NOT NULL AND f.date BETWEEN '%s' and '%s' " +
"GROUP BY f.id",
startDate, endDate
);
return TicketDAO.query(SoldReportRow.class, query);
}
public static <T> List<T> query(Class<T> entityClass, String query) {
EntityManager entityManager = getEntityManager();
TypedQuery<T> q = entityManager.createQuery(query, entityClass);
List<T> entities = null;
try {
entities = q.getResultList();
} finally {
entityManager.close();
}
return entities;
}
public static EntityManager getEntityManager() {
return factory.createEntityManager();
}
The question is, why does this happen and how to fix that?
Thanks!

After the research, I've found that the trouble was caused by the data at the database. By default, SQLite does not have the DATE column type. And it uses strings to describe timestamps. So for date comparison (just like SELECT ... WHERE date BETWEEN a AND b) it's better to use UTC date form, not string one (1397036688 is the better value than the 2014-03-09).

JSP search in more tables in database

With this search.jsp, it finds matches all words searched by user, then removes duplicate found users and shows a list of found matches.
I can only search for e-mail, firstname, lastname, username of a user, but I also want to search skills, and show the users who match that skill found.
For example I search for username; Admin, it finds the admin and shows
this person in the result. This works now, but I also want this;;; If
I search for Java, Then I want everybody that has the skill Java to
show up in the result.
I know it is easier with SQL query's, but this is different.
I have provided the models and database information below;
database:
**Table name: User**
userId
emailAddress
firstname
lastname
username
**Table name: user_skill**
User_userId
skills_skillId
**Table name: skill**
skillId
name
where it all happens : : : search.jsp:
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("Hij komt er in");
//get the action
String uri = request.getRequestURI();
String action = uri.substring(uri.lastIndexOf("/") + 1);
if (action.equals("searchUser")) {
Session session = HibernateUtil.getSessionFactory().openSession();
String searchQuery = request.getParameter("searchQuery");
String[] params = searchQuery.split(" ");
// Found users
List<User> usersFound = new ArrayList<User>();
// Exact match
String hqlMatch = this.getSearchHqlQuery(params, "AND");
List<User> exactResult = session.createQuery(hqlMatch).list();
if (exactResult != null && !exactResult.isEmpty()) {
usersFound.addAll(exactResult);
} // Multiple search
else {
String hqlLike = this.getSearchHqlQuery(params, "OR");
List<User> likeResult = session.createQuery(hqlLike).list();
if (likeResult != null && !likeResult.isEmpty()) {
usersFound.addAll(likeResult);
}
}
System.out.println("size:" + usersFound.size());
// set our results on the request and redirect back
request.setAttribute("users", usersFound);
request.setAttribute("usersSize", usersFound.size());
request.setAttribute("usersSizeResults", usersFound.size());
redirect(request, response, "/search.jsp");
session.close();
}
}
private String getSearchHqlQuery(String[] params, String andOrfilter) {
StringBuilder hql = new StringBuilder();
hql.append("from User ");
if (params.length > 0) {
hql.append("where ");
for (int i = 0; i < params.length; i++) {
if (i > 0) {
hql.append(andOrfilter);
}
hql.append(" (username like '%").append(params[i]);
hql.append("%' OR firstname like '%").append(params[i]);
hql.append("%' OR lastname like '%").append(params[i]);
hql.append("%' OR emailAddress like '%").append(params[i]);
hql.append("%') ");
}
}
return hql.toString();
}
model.user.java:
#Entity
public class User implements Serializable{
#Id
#GeneratedValue
private int userId;
private String username, firstname, lastname, emailAddress, position, password;
private String fullName;
private boolean isAdmin;
#ManyToMany
private List<Skill> skills;
public User(){
}
model.skill.java:
#Entity
public class Skill implements Serializable {
#Id
#GeneratedValue
private long skillId;
#Column(columnDefinition = "varchar(25)")
private String name;
#Column(columnDefinition = "varchar(25)")
private String level;
#Column(columnDefinition = "varchar(250)")
private String description;
public Skill() {
}

Add a join to the skills, and an or clause to your query:
select distinct u from User u
left join u.skills skill
where ... (existing or clauses)
or skill.name like :param
Also, your code is opened to SQL injection attacks, and will fail if the param contains a single quote. Use a named parameter as shown above.

HQL query where exists or between list elements

I have a Tag class like this:
public class Tag {
private Long id;
private String title;
private Set<Document> documents = new HashSet<Document>();
public Tag(){}
//getter and setter...
}
And a class Document clasified by some tags object
public class Document {
private Long id;
private String title;
private Int numberPages;
private Set<Tag> tags = new HashSet<Tag>();
public Document(){}
//getter and setter...
}
And now I would like get documents with a 10 pages maximun and they have tags "short" OR "essay"
I guess something like:
int nPages = 10;
Query query = session.createQuery("from Document where nPages <= :numberPages and (<<short>> OR <<essay>>);
query.setInteger("numberPages", nPages);
The list of tags could be variable. And I would like differentiate when have to be all tags ("AND" between tags) or with any tag is enough ("OR" between tags)
How can I build the sql statement?

I think your HQL should look like below:
Query query = session.createQuery(
"from Document d join d.tags t "+
" where d.nPages <= :numberPages and "+
" t.title in (:titles) ";
List<String> titles = new ArrayList<String>();
titles.add("short");
titles.add("essay");
query.setParameter("numberPages", nPages);
query.setParameterList("titles", titles);

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