i need some help in formulating the correct JPQL query in Spring Data with JPA.
The usecase is:
Update a certain attribute of a bunch of Entities with a random value, and for every updated entity the random value must be different.
I tried this:
#Query("update Entity e set e.randomValue = " + UUID.randomUUID().toString())
void updateRandomValue()
This is pure JPQL, but the result is, that every Entity has now the same random value.
I could make it work with a native query query, but i really would like to have pure JPQL to be DB independent.
Any clue? Thanks!
Related
i would like to know if you have any idea how i can achieve this, considering a query stored as string in the configuration file.
I tried to use SqlQuery applied to the DBSet, but the problem is that SqlQuery requires me to select all properties of the required entities in my query. If i don't consider any column, it will complain because is not able to map the query to the entities.
I don't want to select all properties of the entities i want to query.
Thanks
If you are using EF then why not use Database.ExecuteSqlCommand()? It's in the System.Data.Entity namespace.
For example:
int result = db.Database.ExecuteSqlCommand("Non SELECT SQL etc...");
Well, I ended up implementing a mechanism using reflection that basically receives a group of fields to select, and constructs dynamic objects with those fields, so when applied the query with the joins between the entities, will only bring the fields I am looking for.
So, considering Entity1, Entity2, Entity3 with the following relationship
<b>Entity1</b>{
<br/> Entity1Name, <br/> List<*Entity2*> Entity2Items, <br/> etc..
<br/>}
and
<b>Entity2</b> { <br/> Entity2Name, <br/> List<*Entity3*> Entity3Items <br/>}
I can store e.g. the following query in the configuration file, and retrieve the information:
"Entity1.Entity1Name", <br/>
"Entity1.Entity2Items.Entity2Name", <br/>
"Entity1.Entity2Items.Entity3Items.Entity3Name"
Anyway, I was just trying to see if there would be any solution out-of-the-box that would require minimal code changes.
Thank you.
I want to learn if we could write a query that has a condition like
List<Entity> findbyField1EqualsField2();
This method should not take any parameter . It should fetch entities which has a field1 equals field2. It is just a simple sql :
select * from entity where field1=field2.
But I could not find any solution yet. Thanks.
Create an operation with a query as next:
#Query("select t from entity t where t.field1 like t.field2")
List<T> findByField1LikeField2();
I don't think findByField1LikeField2()works.... you would need to do it passing a param findByField1Like(String param) and for this maybe you would need to load the entity before to get the value of field2.
I am trying to duplicate the following SQL statement as a LINQ to Entities query (where "PRODUCTS" is the table mapped to the entity) ... NOTE IQueryable ... most of what I have seen posted as solutions convert either the search parameters, or the dump the results into an IEnumerable and then proceed to convert from there. I am dealing with 100's of millions of records and cannot afford to load 200 million records into memory, only to have to filter through them again. I would like, if possible to do this in a single query to the databse.
select *
from PRODUCTS
where
MODEL_CODE = '65' and
CAST(SERIAL_NUMBER as int) > 927000 and
CAST(SERIAL_NUMBER as int) < 928000
I have tried the following ...
int startSN, endSN;
startSN = 9500
endSN = 9500
if (!int.TryParse(startSerialNumber, out startSN))
throw new InvalidCastException("The start serial number was not a valid value");
if (!int.TryParse(endSerialNumber, out endSN))
throw new InvalidCastException("The end serial number was not a valid value");
IQueryable<PRODUCT> resultList = base.Context.PRODUCTS.Where(b =>
(Convert.ToInt32(b.SERIAL_NUMBER) > startSN) &&
(Convert.ToInt32(b.SERIAL_NUMBER) < endSN)).AsQueryable();
I have tried a couple of other version of things similiar to this with no luck. I have looked at the following posts also with no luck.
Convert string to int in an Entity Framework linq query and handling the parsing exception - the solution converts query to a list before converting the entity properties.
Convert string to Int in LINQ to Entities ? -
This problem was just with converting the parameters which can be easily done outside the LINQ to Entities statement. I am already doing this for the parameters.
LINQ to Entities StringConvert(double)' cannot be translated to convert int to string - This problem is actually the reverse of mine, trying to convert an int to a string. 1) SqlFunctions does not provide a function for converting TO an int. 2) Ultimately the solution is to, again convert to an IEnumerable before converting/casting the values.
Anybody got any other ideas? I am little stumped on this one!
Thank you,
G
If you don't use code-first, but an EDMX based approach model defined functions are probably the best solution: Convert String to Int in EF 4.0
Alternatively you can use...
base.Context.PRODUCTS.SqlQuery(string sql, params object[] parameters)
...and then pass in the raw SQL statement from your question.
DbSet<T>.SqlQuery(...) returns a DbSqlQuery<T> as result. It is important to keep in mind that this type does not implement IQueryable<T>, but only IEnumerable<T>. Its signature is:
public class DbSqlQuery<TEntity> : IEnumerable<TEntity>, IEnumerable, IListSource
where TEntity : class
So you can extend this result with further LINQ methods, but it is only LINQ to Objects that will be executed in memory with the returned result set from the SQL query. You can not extend it with LINQ to Entities that would be executed in the database. Hence, adding .Where filters to DbSqlQuery<T> does not have any influence on the database query and the set of data that is loaded from the DB into memory.
That's actually not surprising as it would mean otherwise that a partial expression tree (from a Where method) had to be translated into SQL and then merged into a hand-written SQL statement so that a correct new composed SQL statement results and could be sent to the database. Sounds like a pretty hard task to me.
I understand JPQL does not let us do date arithmetic, but i'm new to it so i'm wondering if there's a simple way to tackle this problem (i'm using eclipselink):
I have two entities, entity A which has a one-to-many relationship with entity B.
Entity A stores the time, and each record for entity B has a date.
I want to select rows from entity B between a date range, taking into account the time field of entity A which it belongs to.
One solution i've thought about is just fetching all entities within the date range (ignoring the time), and then manually filtering out the results taking into account the time in entity A, after the query has ran.
But, I want to know if there's a JPA way, which won't result in unnecessary records being fetched.
EclipseLink supports a FUNC keyword in JPQL that allows calling any database function.
You database will provide date arithmetic functions, so you can use these.
See,
http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Querying/Support_for_Native_Database_Functions
I am trying to execute a namedquery
#NamedQuery(name="getEmployeeDetails",query="select e.username,e.email,e.image,e.firstname,e.lastname from Employee e where e.empid=?1")
Now when I execute this query in a EJB 3.0 Session Bean what is the object I should return.I tried returning Listits returning a Vector which creates a classcast exception.The employee table contains fields like password and other confidential details which I don't want to fetch.So I am not using select e from Employee e.
I am learning JPA can anyone help.
Below is the sample query which fetches only the required fields, but have to make such constructor for it.
Query : SELECT NEW package_name.Employee(e.username,e.email,e.image,e.firstname,e.lastname) FROM Employee e where e.empid=?1;
It will return Employee entity with selected fields & remaining will have default values.
Inspect the returned type by calling .getClass() on a returned object. I'd guess it's an array.
But this is not really a good way to use JPA. Select the whole entity and then just don't use what you don't need. It's not such a performance hit.