In my Spring Hibernate application i have all the sql queries in one common_queries.xml file,where some queries require 2 to 3 parameters shown as below
<query id="mining.fuel" no-of-params="2">
select ms.id id,ms.name value,concat(ms.name,' ',' (',ms.code,')') label,ms.rate rate from mining_fuel ms where ms.name like '?' and ms.fuel_type_id=? LIMIT 10
</query>
In my daoImpl i get this query
lookupList = jdbcTemplate.queryForList(q1.getQuery());
I will get the query here,but how to pass the value of '?'s here, i have those 2 values with me in daoImpl.. pl send the code of how to achieve this.I dont want to use prepared statement.
Use this overload which takes an Object vararg for passing the query parameters:
lookupList = jdbcTemplate.queryForList(q1.getQuery(), value1, value2, value3);
I think that you only need to create an Object array with the params used by the query, take in mind that the order is important because value1 will be the first replacement for ? in the query.
lookupList = jdbcTemplate.queryForList(q1.getQuery(), new Object[]{value1, value2, value3});
First calls the queryForList method on jdbctemplate reference and pass query and object type array in this object type array we must pass only objects means if we have id it is int type we have to convert to object type while putting inside object array.
lookupList = jdbcTemplate.queryForList(q1.getQuery, new Object[]{designation, new Integer(id), new Float(sal)}
Related
My Spring data JPA code to get the data from db based on some search criteria is not working. My DB is SQL Server 2012, same query seem to work with MYSQL DB.
Code Example :
#Query(value = "select * from entity e where e.emp_id=:#{#mySearchCriteria.empId} and ((:#{#mySearchCriteria.deptIds} is null or :#{#mySearchCriteria.deptIds} ='') or e.dept_id in (:#{#mySearchCriteria.deptIds})) ", nativeQuery = true)
public List<Entity> search(#Param("mySearchCriteria") MySearchCriteria mySearchCriteria);
if list mySearchCriteria.deptIds has more than one value- it's not working(it's actually translating it to wrong query. Any lead? Thanks in advance.
Note: data type for deptIds is List of Integer
Its complaining because values of {#mySearchCriteria.deptIds} is comma separated list e.g. 'Value1', 'Value2' so the query gets translated as ('Value1', 'Value2' is null) which causes this error.
Need to verify if list is empty or not and then change the query with IN clause and one without IN clause.
Surround the list by parentheses. This works for me.
(:#{#mySearchCriteria.deptIds}) is null
I have a complex dynamic query in Eclipselink with a case expression that involves two different columns, one of VARCHAR2 and one of NVARCHAR2.
It needs to be a case expression, because I also want to be able to sort by that result column, so I can't just query both. In Java, both are just mapped as a String, so you don't even see there's a difference.
For my query, Eclipselink creates the following select expression:
CASE
WHEN (t9.STRINGVALUE IS NOT NULL)
THEN t9.STRINGVALUE
ELSE t10.OTHERSTRINGVALUE
END ,
The criteria code is:
Expression<String> str = firstRoot.get("stringValue");
Expression<String> strExp = cb.<String> selectCase().when(cb.isNotNull(str), str)
.otherwise(otherRoot.<String> get("otherStringValue"));
q.multiselect(..., strExp, ...);
which causes Oracle to fail with ORA-12704: character set mismatch. I'd like to modify the code to result in
cast(t10.OTHERSTRINGVALUE as NVARCHAR2(50),
but I cannot find out how.
I tried a converter on the Entity's field, or a .as(String.class) on the .get()-expressions for both fields.
So the question: is there a way to pass an Oracle type like NVARCHAR2 to the .as() expression? Can I otherwise insert a call to CAST(... as NVARCHAR2) with criteria API? Is there any other way to have it generate custom SQL, because I REALLY cannot rewrite the whole query, just because JPA or EL don't provide for the possibility that you might need some custom SQL...
The only way to do it in criteria API is to create a new PathImpl from the otherRoot. get("otherStringValue") path, passing in an EclipseLink native cast expression as the expression node. something like:
PathImpl path = (PathImpl)otherRoot.<String> get("otherStringValue");
Path castPath = new PathImpl(path, em.getMetamodel(), path.getJavaType(), path.getCurrentNode().cast("NVARCHAR2"), path.getModel());
Expression<String> str = firstRoot.get("stringValue");
Expression<String> strExp = cb.<String> selectCase().when(cb.isNotNull(str), str)
.otherwise(castPath );
q.multiselect(..., strExp, ...);
I have created a linq query that returns my required data, I now have a new requirement and need to add an extra field into the returned results. My entity contains an ID field that I am trying to map against another table without to much luck.
This is what I have so far.
Dictionary<int, string> itemDescriptions = new Dictionary<int, string>();
foreach (var item in ItemDetails)
{
itemDescriptions.Add(item.ItemID, item.ItemDescription);
}
DB.TestDatabase db = new DB.TestDatabase(Common.GetOSConnectionString());
List<Transaction> transactionDetails = (from t db.Transactions
where t.CardID == CardID.ToString()
select new Transaction
{
ItemTypeID= t.ItemTypeID,
TransactionAmount = t.TransactionAmount,
ItemDescription = itemDescriptions.Select(r=>r.Key==itemTypeID).ToString()
}).ToList();
What I am trying to do is key the value from the dictonary where the key = itemTypeID
I am getting this error.
Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator.
What do I need to modify?
This is a duplicate of this question. The problem you're having is because you're trying to match an in-memory collection (itemDescriptions) with a DB table. Because of the way LINQ2SQL works it's trying to do this in the DB which is not possible.
There are essentially three options (unless I'm missing something)
1) refactor your query so you pass a simple primitive object to the query that can be passed accross to the DB (only good if itemDescriptions is a small set)
2) In your query use:
from t db.Transactions.ToList()
...
3) Get back the objects you need as you're doing, then populate ItemDescription in a second step.
Bear in mind that the second option will force LINQ to evaluate the query and return all transactions to your code that will then be operated on in memory. If the transaction table is large this will not be quick!
I am trying to figure out how to dynamically specify the properties for my select clause in a linq query.
Lets say I have a collection of employee objects. At run time, the end user will be specifying which properties they would like to see for those employees, so I need to be able to dynamically construct my Linq select clause.
I have used the dynamic Linq library, but I prefer not to use that, because it requires me to build a string to pass to the select method. I'd like to understand how to do this via Expressions.
This looks like something that fits more with your requirements of not using dynamic linq.
Use Reflection to get the dynamic Column Values
//columns variable has column name as comma separated String which you
can save in DB //example string columns ="Name,Id,Age";
var strColumns =columns.split(,);
foreach(var myObject in MyObjectcollection)
{
for(int index =0;index<strColumns.count();index++)
{
//Create a collection of objects
mycollection.add(myObject.GetType().GetProperty(strColumns[index]).GetValue(myObject, null));
}
}
I think I'm missing something really basic.
var signatures=from person in db.People
where person.Active==true
select new{person.ID, person.Lname, person.Fname};
This linq query works, but I have no idea how to return the results as a public method of a class.
Examples always seem to show returning the whole entity (like IQueryable<People>), but in this case I only want to return a subset as SomeKindOfList<int, string, string>. Since I can't use var, what do I use?
Thanks!
You can get concrete types out of a linq query, but in your case you are constructing anonymous types by using
select new{person.ID, person.Lname, person.Fname};
If instead, you coded a class called "Person", and did this:
select new Person(peson.ID, person.Lname, person.Fname);
Your linq result (signatures) can be of type IEnumerable<Person>, and that is a type that you can return from your function.
Example:
IEnumerable<Person> signatures = from person in db.People
where person.Active==true
select new Person(person.ID, person.Lname, person.Fname);