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Search criteria and NULL


Search criteria and NULL

By : Lalit Kumar
Date : November 17 2020, 04:28 AM
This might help you I think you'll have to extend your SearchCriteria a bit. Instead of Nullable properties like Nullable Age you'll need a more detailed structure, that gives you the info, if that criterion should be checked or not.
This might additionally give you the option to not just combine your criterions with logical ANDs but also tweak some more functionality out of it ;)
code :


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How to ignore null properties in the search criteria

How to ignore null properties in the search criteria


By : Manohar
Date : March 29 2020, 07:55 AM
To fix this issue Best solution came to my mind is to build aggregate filter (You can use your Track object for that, because it already has all possible properties for filtering collection, and they are nullable):
code :
Track filter = records.Aggregate(
    new Track() { City = _city, Country = _country, Name = _name },
    (f, t) => new Track()
    {
        City = String.IsNullOrEmpty(t.City) ? null : f.City, 
        Country = String.IsNullOrEmpty(t.Country) ? null : f.Country,
        Name = String.IsNullOrEmpty(t.Name) ? null : f.Name
    },
    f => f);
var query = from t in Records
            where (filter.City == null || t.City == filter.City) &&
                    (filter.Country == null || t.Country == filter.Country) &&
                    (filter.Name == null || t.Name == filter.Name)
            select t;
Build a search query with a search criteria in another table using JPA criteria

Build a search query with a search criteria in another table using JPA criteria


By : Rashid Siddiqui
Date : March 29 2020, 07:55 AM
This might help you I need to search states from StateTable based on a given country name (not countryId) in the Country table which should match the like SQL operator using JPA criteria API (countryId is the foreign key in StateTable as the name implies). , You need to perform a join:
code :
Join<StateTable, Country> country = root.join("countryId");
predicates.add(criteriaBuilder.like(country.<String>get("countryName"), "%"+countryName+"%"));
VBA at Access - Filter with several criteria, where one criteria can be Null

VBA at Access - Filter with several criteria, where one criteria can be Null


By : user1781917
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You're nearly there, there are just some minor SQL syntax errors.
I've written it to separate lines to increase readability and make understanding easier
code :
Me.Filter = "[TaetigkeitsDatum] BETWEEN " & Format(Nz(Me!txtvon, Date),"\#yyyy-mm-dd\#") & " AND " & Format(Nz(Me!txtbis, Date), "\#yyyy-mm-dd\#") & _
            " AND [PersonalID] = " & Me.Liste0
If IsNumeric(Me!Kombinationsfeld145) Then
    Me.Filter = Me.Filter & " AND [TaetigkeitsKostenstellenIDRef] =" & Me!Kombinationsfeld145
End If
How to convert if-else if chaining block code with multiple filter criteria into single filter criteria with null check?

How to convert if-else if chaining block code with multiple filter criteria into single filter criteria with null check?


By : clan
Date : March 29 2020, 07:55 AM
With these it helps you can have a class SearchFilter which will contain all your filter fields like searchToken, fname etc. and another one Condition like:
code :
class Condition {
    private Predicate<SearchFilter> searchFilterPredicate;
    private Function<SearchFilter, Predicate<Employee>> function;
}
List<Condition> conditions = Arrays.asList(
    new Condition(sf -> sf.getSearchToken() != null,
                  sf -> emp -> emp.getFName().equalsIgnoreCase(sf.getSearchToken()) && emp.getLName().equalsIgnoreCase(sf.getSearchToken())),
    new Condition(sf -> ObjectUtils.allNotNull(sf.getFname(), sf.getLname(), sf.getType()),
                  sf -> emp-> emp.getFName().equalsIgnoreCase(sf.getFname()) && emp.getLName().equalsIgnoreCase(sf.getLname()) && emp.getType().equalsIgnoreCase(sf.getType()))
    //...
);
public List<Employee> retrieveEmployees(String searchToken, String fname, String lname, String type){
    List<Employee> employees = getEmployees();
    SearchFilter searchFilter = new SearchFilter(searchToken, fname, lname, type);

    Optional<Predicate<Employee>> firstCondition = conditions.stream()
            .filter(condition -> condition.getSearchFilterPredicate().test(searchFilter))
            .findFirst()
            .map(condition -> condition.getFunction().apply(searchFilter));

    return firstCondition.map(employeePredicate -> employees.stream()
                .filter(employeePredicate)
                .collect(Collectors.toList()))
            .orElse(employees);
}
List<Employee> retrieveEmployees(String searchToken, String fname, String lname, String type){
    List<Employee> employees = getEmployees();
    if(searchToken != null) {
        return employees
                .stream()
                .filter(emp -> emp.getFName().equalsIgnoreCase(searchToken) && emp.getLName().equalsIgnoreCase(searchToken))
                .collect(Collectors.toList());

    }
    Predicate<Employee> predicate = employee -> true;

    if(type != null) {
        predicate = predicate.and(emp -> emp.getType().equalsIgnoreCase(type));
    }
    if(lname != null) {
        predicate = predicate.and(emp -> emp.getLName().equalsIgnoreCase(lname));
    }
    if(fname != null) {
        predicate = predicate.and(emp -> emp.getFName().equalsIgnoreCase(fname));
    }

    return employees.stream()
             .filter(predicate)
             .collect(Collectors.toList());
}
How to search for records in Yii using NULL search criteria

How to search for records in Yii using NULL search criteria


By : Charles
Date : March 29 2020, 07:55 AM
With these it helps Say I have Product model which has Category property and I want to pull all such products where category is null using search() function. , 1st variant:
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