Unable to locate appropriate constructor on class [ClassName] - sql

I want to send a sql query by using Spring JPA like :
"SELECT NEW com.blalba.model.service.FamilyMaterialDto "
+ "(ms.id, mi.partNumber, ftc.commodityType, ftc.materialType, ms.grade, ms.thickness, ms.width) "
+ "FROM MaterialInstance mi, FamilyTypeCommodity ftc, MaterialSpecification ms "
+ "WHERE ftc.materialFamily.id = :familyId "
+ "AND (:typeId is null OR ftc.materialType.id = :typeId) "
+ "AND ftc.id = ms.familyTypeCommodity.id "
+ "AND ms.id = mi.materialSpecification.id "
+ "AND mi.materialSpecification.isActive = true"
However, when I remove some fields like "ms.width", I get the error:
Unable to locate appropriate constructor on class [com.commencis.sova.model.service.FamilyMaterialDto]. Expected arguments are: java.lang.String, java.lang.String, com.commencis.sova.model.entity.material.CommodityType, com.commencis.sova.model.entity.material.MaterialType, com.commencis.sova.model.entity.material.Grade, com.commencis.sova.model.entity.material.Thickness [SELECT NEW com.commencis.sova.model.service.FamilyMaterialDto (ms.id, mi.partNumber, ftc.commodityType, ftc.materialType, ms.grade, ms.thickness) FROM com.commencis.sova.model.entity.material.MaterialSpecification ms, com.commencis.sova.model.entity.material.MaterialInstance mi, com.commencis.sova.model.entity.material.FamilyTypeCommodity ftc WHERE ftc.materialFamily.id = :familyId AND (:typeId is null OR ftc.materialType.id = :typeId) AND mi.materialSpecification.isActive = true AND ms.id = mi.materialSpecification.id AND ftc.id = ms.familyTypeCommodity.id]
I understand that return Object[] cannot be parsed to DTO object. If I write constructor without the parameter - "Width", it will work properly. However, I want to provide that a query can be sendable without some parameters(sometimes one of them, sometimes five of them) and a result can be parsable with FamilyMaterialDTO.
How can I do? I don't have to use DTO, if there is another solution for this problem, please recommend.

I think you can make the query to return a map and you can create a constructor for FamilyMaterialDTO which takes the argument as a map. And based on the keys present in the map you can set the values...
For simplicity let me create my own class.
Class foo { String a; Integer b; Boolean c;}
And a sample query
"select new map (a as a, b as b) from Foo f"
Now this query will return a list of maps and the size of the list depends on how many rows the query returns.
Now you can create a constructor like this. Assume the size of list is 1.
foo (List<Map<?,?> list) {
Map map = list.get(0);
If(map.containsKey("a")) this.a = map.get("a");
If(map.containsKey("b")) this.b = map.get("b");
If(map.containsKey("c")) this.c = map.get("c"); }

Related

Spring data repository query to retrieve values containing null

I have following User table and repository.
User:
id;name;job;age
1;steve;nurse;33
2;steve;programmer;null
3;steve;programmer;null
Repository method:
#Query("SELECT u FROM User u WHERE ("
+ "LOWER(u.name) = LOWER(:name) AND "
+ "LOWER(u.beruf) = LOWER(:job) AND "
+ "LOWER(u.alter) = LOWER(:age))")
public List<User> findUsers(#Param("name") String name,
#Param("job") String job,
#Param("age") String age);
If I call the repository method with following parameters
String name = "steve";
String job = "programmer";
List<User> result = repository.findUsers(name, job, null); // empy list ..why ?
I get an empty list as result, although I expect to get the entities with id=2 and id=3 as result.
What am I doing wrong ? How should I change the query to get the two entities as result.
Thanks
According to the documentation this behaviour is normal there is no way to ignore null fields. using #Query method.
instead you can use the query method specifications.
more information [here][jpa documentaiton]
if you want to keep your existing method you can also go like this:
#Query("SELECT u FROM User u WHERE ("
+ "LOWER(u.name) = LOWER(:name) AND "
+ "LOWER(u.beruf) = LOWER(:job) AND "
+ "( " +
" :age is null or LOWER(u.alter) = LOWER(:age) " +
")"
)
public List<User> findUsers(#Param("name") String name,
#Param("job") String job,
#Param("age") String age);

PetaPoco db.SingleOrDefault<T> passing in where name as well as value

I am trying to write a generic method to call DB records.
All works except to make the method useful I need to passing the WHERE name value too...as well as the value to match.
Something like this...
T values = db.SingleOrDefault<T>("WHERE " + name + " = #0", value);
This works but its a bit of a clunk!
string sql = "WHERE " + name + " = #0";
T values = db.SingleOrDefault<T>(sql, value);
Can this be done with different syntax?
Thanks
You can create an extension method to hide the syntax if that bothers you
public static T SingleOrDefaultWithWhere<T>(this PetaPoco.Database db, string name, object value) {
string sql = "WHERE " + name + " = #0";
return db.SingleOrDefault<T>(sql, value);
}
And then just call
T values = db.SingleOrDefaultWithWhere<T>(name, value);

DataContext.ExecuteQuery<object> returns object {}

I'm trying to write function for selecting optional columns in linq(columns that may not exist). The problem is in linq like this:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? t.B : -1; //this is optional column
}}
Unfortunately, this won't work because the fragment near Optional will be translated to case statement and error arises that column not exists.
So i decided to "cover" it with function:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? OptionalColumnValue<int>("table","B","id_table",t.id_table) : -1; //this is optional column
}}
I want this function to be universal. It should work like that" If there is no value or column is nullable and value is null then return default value for type.
I came up with something like this:
//table,column - obvious,id_column - PK column of table, id - id of currently processing record
public static T OptionalColumnValue<T>(string table,string column,string id_columm,int id) T t = default(T);
DataDataContext db = new DataDataContext();
IEnumerable<object> value = db.ExecuteQuery<object>("select " + column + " from " + table + " where " + id_columm + " = " + id.ToString());
List<object> valueList = value.ToList();
if (valueList.Count == 1)//here is the problem
t = (T)valueList.First();
return t;
}
When there is null value db.ExecuteQuery return something like object{}. I'm assuming this is "empty" object,with nothing really in there. I was thinking about checking for "emptiness" of this object( BTW this is not DBull).
When i realised that this is no way either with concrete value in this column(it cannot cast it to return correct type), then I tried db.ExecuteQuery<T>. Then concrete value - OK, null - Exception.
I thought, maybe Nullable<T> as return value. Nop, because string also can be T.
I don't know what to do next. Maybe there's another solution to this problem.

How can Jdbc template be used for UPDATE query with IN clause?

I've gone through various forums to handle the IN clause using spring's namedParamJdbcTemplate but i still do not get the stuff I'm exactly looking for.
Below is my issue:
I've the following method:
public void updateBatchTableForStatus(List<Integer> reportShellIds, String scheduleType) {
Map<String,List<Integer>> shellIds = Collections.singletonMap("reportShellIds", reportShellIds);
MapSqlParameterSource parameters = new MapSqlParameterSource();
parameters.addValue("reportShellIds", shellIds, Types.NUMERIC)
parameters.addValue("eventType", scheduleType, Types.VARCHAR);
this.namedParamJdbcTemplate.update(GET_EVENT_METADATA_INFO, parameters);
}
The query refered in above method is as defined below:
public static final String SQL_UPDATE_BATCH_LOOKUP_TABLE_FOR_STATUS_BY_BATCH_IDS = "" +
"UPDATE " +
TABLE_BATCH_REF + " BLK " +
"SET " +
"BLK.EXECUTION_STATUS_CODE = :eventType " +
"WHERE " +
"BLK.BATCH_ID in(:reportShellIds) ";
Datatype for BATCH_ID column is Number(24,0) and for the EXECUTION_STATUS_CODE column Varchar.
I'm using Oracle db.
However, the above method throws a SQL exception.
Can someone pls tell me where I'm wrong and what is the fix for it ?
Many thanks in advance.
Best Regards
LB
You are binding reportShellIds to a Map, but it needs to be a List for Spring to bind it correctly. Perhaps you meant shellIds.values() or the variable reportShellIds?
You can use another method with simple Map<String,Object> and place the array as is into the parameter map
public int update(String sql, java.util.Map<java.lang.String,?> paramMap)

How to customize the update functionality in ColdFusion ORM?

I want to customize the update function of ORM. By default, ORM loads the object that needs to be updated, makes updates, and then saves the object. I want to update a record when a certain condition is satisfied.
For example :
I want to update payment mode from credit card to cash. Before updating records I want to check that I already have a cash payment mode. If one exists then I do not need to update a record otherwise update the record.
For the above checking I have used this SQL:
SELECT COUNT(*)
FROM hr_lookup_paymentmode
WHERE PaymentMode = 'cash'
AND modeid <> '10'
Equivalent HQL:
/**
* #hint Determines total number of results with same value of search for update purposes.
*/
remote numeric function searchUpdateCount(string q,numeric modeid ) output="false" {
var hqlString = "";
var whereClause = "";
var params = {};
hqlString = hqlString & "SELECT count(*) ";
hqlString = hqlString & "FROM hr_lookup_paymentmode";
if (len(arguments.q) gt 0)
{
whereClause = ListAppend(whereClause, " PaymentMode = '#arguments.q#'", "|");
whereClause = ListAppend(whereClause, "modeid <> '#arguments.modeid#'", "|");
whereClause = Replace(whereClause, "|", " AND ", "all");
}
if (len(whereClause) gt 0){
hqlString = hqlString & " WHERE " & whereClause;
}
return ormExecuteQuery(hqlString, false, params)[1];
}
Parameter q = 'cash' and modeid = 10. If count found is greater than 0 means record already exists, otherwise go for update.
Please help me apply this logic.
You can use ORM event handlers - either globally defined or defined in specific ORM objects. Here is some information on event handlers, but basically you would do the following in your ORM object:
function preUpdate( obj, data ){
{do stuff here }
}
In this example obj is the ORM entity you are trying to save and data is a structure containing the old data from the ORM entity. You would simply add your logic to the body of the function.