I'm currently trying to implement the function "Load all X where X.name contains y" using a Ms SQL-Server and the Panache-Repositories.
I know the SQL-Query "SELECT * FROM X WHERE X.name LIKE '%0y%'" works, but I can't get it to work using the Panache-Query.
I've tried
#ApplicationScoped
public class XRepository implements PanacheRepository<X> {
public List<X> listWhereLike(String like) {
return list("name like ?1", "%" + like + "%");
}
public List<X> listWhereLike(String like) {
return list("name like %?1%", like);
}
public List<X> listWhereLike(String like) {
return list("contains(name, ?1)", like);
}
}
but none of them work.
They either throw an exception because of the unexpected character '%' or '(' or they simply return an empty list.
What am I missing?
This is the solution , you just need to put the pattern in a String before adding it to the query;
public List<X> listWhereLike(String like) {
String searchInput = "%" + like + "%";
return list("name like ?1", searchInput );
}
Related
I have created AttributeConverter class which is converting Enum to DB value and overriden the necessary methods.
If I use JPA query like below then converter is getting called and getting correct result.
public List<Driver> findByStatus(DriverStatus status);
BUT If I use with Query annotation that AttributeConverter is not getting called. I have more complex query where I need to use native query with Attribute Converter but it is not working for me.
#Query(value = "select * from driver where status=:status", nativeQuery = true)
public List<Driver> findByStatus1(DriverStatus status);
is there any way to handle this requirement ?
Update 1 - below is the Converter code
#Converter(autoApply = true)
public class DriverStatusConverter implements AttributeConverter<DriverStatus, String> {
#Override
public String convertToDatabaseColumn(DriverStatus driverStatus) {
if (driverStatus == null) {
return null;
}
System.err.println("from converter" +driverStatus.getCode());
return driverStatus.getCode();
}
#Override
public DriverStatus convertToEntityAttribute(String code) {
if (code == null) {
return null;
}
return Stream.of(DriverStatus.values()).filter(c -> c.getCode().equals(code)).findFirst()
.orElseThrow(IllegalArgumentException::new);
}
}
Faced similar issue, wasn't able to find satisfying solution, so had to resort to the ugly hack... Repository method signature was changed like so:
public List<Driver> findByStatus1(Integer status);
...and was called like so:
repository.findByStatus1(DriverStatus.YOUR_DESIRED_STATUS.getCode());
Yes, it's ugly and kinda defeats the purpose of AttributeConverter, but at least it works. In my particular case I had to resort to such measures just with one native query. AttributeConverter still works for the all other JPA queries.
I just come across same problem and use following to go around it
DriverStatusConverter move logic code in convertToEntityAttribute to public static method:
#Override
public DriverStatus convertToEntityAttribute(String code) {
return convertStringToEnum(code);
}
public static DriverStatus convertStringToEnum(String code) {
if (code == null) {
return null;
}
return Stream.of(DriverStatus.values()).filter(c -> c.getCode().equals(code)).findFirst()
.orElseThrow(IllegalArgumentException::new);
}
create new DriverDTO for native query result
public interface DriverDTO {
public Integer getId();
public String getName();
public String getStatusCode();
default DriverStatus getStatus() {
return DriverStatusConverter.convertStringToEnum(getStatusCode());
}
}
DriverRepository findByStatusCode() select columns in query and return DriverDTO class
#Query(value = "select id, name, status as statusCode from driver WHERE status=:statusCode", nativeQuery = true)
public List<DriverDTO> findByStatusCode(String statusCode);
Remove the nativeQuery = true and try.
#Query(value = "select * from driver where status=:status")
public List<Driver> findByStatus1(DriverStatus status);
Alternatively you can try using entityManager like so -
This is just sample code.
TypedQuery<Trip> q = entityManager.createQuery("SELECT t FROM Trip t WHERE t.vehicle = :v", Trip.class);
q.setParameter("v", Vehicle.PLANE);
List<Trip> trips = q.getResultList();
Reference -
https://thorben-janssen.com/jpa-21-type-converter-better-way-to/
I'm trying to setup tests with Arch Unit to test my naming conventions, following the official examples.
It seems ArchUnit's naming assertions are case sensitive, which is bothering me.
I want to test that no classes in the package domain.service contains the word service.
Given a class domain.service.FileSystemService:
This test passes:
#ArchTest
val domain_service_should_not_have_names_containing_service: ArchRule =
noClasses()
.that().resideInAPackage("..domain.service..")
.should().haveSimpleNameContaining("service")
This test fails:
#ArchTest
val domain_service_should_not_have_names_containing_service: ArchRule =
noClasses()
.that().resideInAPackage("..domain.service..")
.should().haveSimpleNameContaining("Service")
Am I missing something? Is there a way to make ArchUnit's comparisons case insensitive?
If you don't want to use haveNameMatching as proposed in the comments you can also create your own ArchConditions.
public static ArchCondition<JavaClass> containName(String namePart) {
return new NameContains(namePart);
}
private static class NameContains extends ArchCondition<JavaClass> {
private String namePart;
NameContains(String namePart) {
super("contain '" + namePart + "' in the name");
this.namePart = namePart;
}
#Override
public void check(JavaClass javaClass, ConditionEvents events) {
boolean containsName = javaClass.getSimpleName().toLowerCase().contains(namePart.toLowerCase());
String message;
if (containsName) {
message = createCheckMessage(javaClass, "contains '" + namePart + "' in the name");
} else {
message = createCheckMessage(javaClass, "does not contain '" + namePart + "' in the name");
}
events.add(new SimpleConditionEvent(javaClass, containsName, message));
}
}
// taken from com.tngtech.archunit.lang.conditions.ArchConditions
public static <T extends HasDescription & HasSourceCodeLocation> String createCheckMessage(T object,
String message) {
return object.getDescription() + " " + message + " in " + object.getSourceCodeLocation();
}
You can use it like this:
rules.add(noClasses().that().resideInAPackage("..domain.service..").should(containName("Service")));
i have two Presenters: A DevicePresenter and a ContainerPresenter. I place a PlaceRequest in the DevicePresenter to call the ContainerPresenter with some parameters like this:
PlaceRequest request = new PlaceRequest.Builder()
.nameToken("containersPage")
.with("action","editContainer")
.with("containerEditId", selectedContainerDto.getUuid().toString())
.build();
placeManager.revealPlace(request);
In my ContainersPresenter i have this overridden method:
#Override
public void prepareFromRequest(PlaceRequest placeRequest) {
Log.debug("prepareFromRequest in ContainersPresenter");
super.prepareFromRequest(placeRequest);
String actionString = placeRequest.getParameter("action", "");
String id;
//TODO: Should we change that to really retrieve the object from the server? Or should we introduce a model that keeps all values and inject that into all presenters?
if (actionString.equals("editContainer")) {
try {
id = placeRequest.getParameter("id", null);
for(ContainerDto cont : containerList) {
Log.debug("Compare " + id + " with " + cont.getUuid());
if(id.equals(cont.getUuid())) {
containerDialog.setCurrentContainerDTO(new ContainerDto());
addToPopupSlot(containerDialog);
break;
}
}
} catch (NumberFormatException e) {
Log.debug("id cannot be retrieved from URL");
}
}
}
But when revealPlace is called, the URL in the browser stays the same and the default presenter (Home) is shown instead.
When i print the request, it seems to be fine:
PlaceRequest(nameToken=containersPage, params={action=editContainer, containerEditId=8fa5f730-fe0f-11e3-a3ac-0800200c9a66})
And my NameTokens are like this:
public class NameTokens {
public static final String homePage = "!homePage";
public static final String containersPage = "!containersPage";
public static final String devicesPage = "!devicesPage";
public static String getHomePage() {
return homePage;
}
public static String getDevicesPage() {
return devicesPage;
}
public static String getContainersPage() {
return containersPage;
}
}
What did i miss? Thanks!
In your original code, when constructing your PlaceRequest, you forgot the '!' at the beginning of your nametoken.
.nameToken("containersPage")
while your NameTokens entry is
public static final String containersPage = "!containersPage";
As you noted, referencing the constant in NameTokens is less prone to such easy mistakes to make!
Sometimes the problem exists "between the ears". If i avoid strings but use the proper symbol from NameTokens like
PlaceRequest request = new PlaceRequest.Builder()
.nameToken(NameTokens.containersPage)
.with("action","editContainer")
.with("containerEditId", selectedContainerDto.getUuid().toString())
.build();
it works just fine. Sorry!
I have a script which is loading some data about venues:
venues = LOAD 'venues_extended_2.csv' USING org.apache.pig.piggybank.storage.CSVLoader() AS (Name:chararray, Type:chararray, Latitude:double, Longitude:double, City:chararray, Country:chararray);
Then I want to create UDF which has a constructor that is accepting venues type.
So I tried to define this UDF like that:
DEFINE GenerateVenues org.gla.anton.udf.main.GenerateVenues(venues);
And here is the actual UDF:
public class GenerateVenues extends EvalFunc<Tuple> {
TupleFactory mTupleFactory = TupleFactory.getInstance();
BagFactory mBagFactory = BagFactory.getInstance();
private static final String ALLCHARS = "(.*)";
private ArrayList<String> venues;
private String regex;
public GenerateVenues(DataBag venuesBag) {
Iterator<Tuple> it = venuesBag.iterator();
venues = new ArrayList<String>((int) (venuesBag.size() + 1)); // possible fails!!!
String current = "";
regex = "";
while (it.hasNext()){
Tuple t = it.next();
try {
current = "(" + ALLCHARS + t.get(0) + ALLCHARS + ")";
venues.add((String) t.get(0));
} catch (ExecException e) {
throw new IllegalArgumentException("VenuesRegex: requires tuple with at least one value");
}
regex += current + (it.hasNext() ? "|" : "");
}
}
#Override
public Tuple exec(Tuple tuple) throws IOException {
// expect one string
if (tuple == null || tuple.size() != 2) {
throw new IllegalArgumentException(
"BagTupleExampleUDF: requires two input parameters.");
}
try {
String tweet = (String) tuple.get(0);
for (String venue: venues)
{
if (tweet.matches(ALLCHARS + venue + ALLCHARS))
{
Tuple output = mTupleFactory.newTuple(Collections.singletonList(venue));
return output;
}
}
return null;
} catch (Exception e) {
throw new IOException(
"BagTupleExampleUDF: caught exception processing input.", e);
}
}
}
When executed the script is firing error at the DEFINE part just before (venues);:
2013-12-19 04:28:06,072 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1200: <file script.pig, line 6, column 60> mismatched input 'venues' expecting RIGHT_PAREN
Obviously I'm doing something wrong, can you help me out figuring out what's wrong.
Is it the UDF that cannot accept the venues relation as a parameter. Or the relation is not represented by DataBag like this public GenerateVenues(DataBag venuesBag)?
Thanks!
PS I'm using Pig version 0.11.1.1.3.0.0-107.
As #WinnieNicklaus already said, you can only pass strings to UDF constructors.
Having said that, the solution to your problem is using distributed cache, you need to override public List<String> getCacheFiles() to return a list of filenames that will be made available via distributed cache. With that, you can read the file as a local file and build your table.
The downside is that Pig has no initialization function, so you have to implement something like
private void init() {
if (!this.initialized) {
// read table
}
}
and then call that as the first thing from exec.
You can't use a relation as a parameter in a UDF constructor. Only strings can be passed as arguments, and if they are really of another type, you will have to parse them out in the constructor.
One of my Join key-selectors looks like this:
x => x.A + "-" + x.B
NHibernate makes "-" an extra parameter. This parameter gets the SQL type nvarchar and so the whole statement gets converted on the SQL Server from varchar to nvarchar.
The problem with this is, that SQL Server has a huge problem if the queried column is of type varchar instead of nvarchar. This is because the column is of another type than the parameter and so the index can't be used.
I cannot change the type of the column so I need to define somehow that NHibernate should use varchar for string literals when converting lambdas.
Any way to do this?
UPDATE
With help from Oskar Berggren I setup this classes:
public static class VarcharFix
{
/// This method returns its argument and is a no-op in C#.
/// It's presence in a Linq expression sends a message to the NHibernate Linq Provider.
public static string AsVarchar(string s)
{
return s;
}
}
public class MyHqlIdent : HqlExpression
{
internal MyHqlIdent(IASTFactory factory, string ident)
: base(HqlSqlWalker.IDENT, ident, factory)
{
}
internal MyHqlIdent(IASTFactory factory, System.Type type)
: base(HqlSqlWalker.IDENT, "", factory)
{
if (IsNullableType(type))
{
type = ExtractUnderlyingTypeFromNullable(type);
}
switch (System.Type.GetTypeCode(type))
{
case TypeCode.Boolean:
SetText("bool");
break;
case TypeCode.Int16:
SetText("short");
break;
case TypeCode.Int32:
SetText("integer");
break;
case TypeCode.Int64:
SetText("long");
break;
case TypeCode.Decimal:
SetText("decimal");
break;
case TypeCode.Single:
SetText("single");
break;
case TypeCode.DateTime:
SetText("datetime");
break;
case TypeCode.String:
SetText("string");
break;
case TypeCode.Double:
SetText("double");
break;
default:
if (type == typeof(Guid))
{
SetText("guid");
break;
}
if (type == typeof(DateTimeOffset))
{
SetText("datetimeoffset");
break;
}
throw new NotSupportedException(string.Format("Don't currently support idents of type {0}", type.Name));
}
}
private static System.Type ExtractUnderlyingTypeFromNullable(System.Type type)
{
return type.GetGenericArguments()[0];
}
// TODO - code duplicated in LinqExtensionMethods
private static bool IsNullableType(System.Type type)
{
return (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>));
}
}
public class MyHqlCast : HqlExpression
{
public MyHqlCast(IASTFactory factory, IEnumerable<HqlTreeNode> children)
: base(HqlSqlWalker.METHOD_CALL, "method", factory, children)
{
}
public static MyHqlCast Create(IASTFactory factory, HqlExpression expression, string targetType)
{
return new MyHqlCast(factory,
new HqlTreeNode[]
{
new MyHqlIdent(factory, "cast"),
new HqlExpressionList(factory, expression,
new MyHqlIdent(factory, targetType))
});
}
}
public class MyBaseHqlGeneratorForMethod : BaseHqlGeneratorForMethod
{
public MyBaseHqlGeneratorForMethod()
: base()
{
SupportedMethods = new MethodInfo[] { typeof(VarcharFix).GetMethod("AsVarchar") };
}
public override HqlTreeNode BuildHql(MethodInfo method, System.Linq.Expressions.Expression targetObject, System.Collections.ObjectModel.ReadOnlyCollection<System.Linq.Expressions.Expression> arguments, HqlTreeBuilder treeBuilder, global::NHibernate.Linq.Visitors.IHqlExpressionVisitor visitor)
{
return MyHqlCast.Create(new ASTFactory(new ASTTreeAdaptor()),
visitor.Visit(targetObject).AsExpression(),
"varchar");
}
}
public class ExtendedLinqtoHqlGeneratorsRegistry : DefaultLinqToHqlGeneratorsRegistry
{
public ExtendedLinqtoHqlGeneratorsRegistry()
{
this.Merge(new MyBaseHqlGeneratorForMethod());
}
}
For now it's still not working but I see light ;)
UPDATE 2: The Query
var query = aQueryable
.Join(bQueryable,
x => x.AB, x => x.A + VarcharFix.AsVarchar("-") + x.B,
(head, middle) => new ...)
UPDATE 3:
As "-".AsVarchar() gets optimized to "-" we need a dummy parameter, which cannot be optimized like "-".AsVarchar(x.A) - that way the Linq-extension kicks in!
var query = aQueryable
.Join(bQueryable,
x => x.AB, x => x.A + "-".AsVarchar(x.A) + x.B,
(head, middle) => new ...)
There may be multiple ways to do this but here is one:
Invent your own method such as:
/// This method returns its argument and is a no-op in C#.
/// It's presence in a Linq expression sends a message to the NHibernate Linq Provider.
public static string AsVarchar(string s)
{
return s;
}
Also create a class to represent the HQL expression fragment:
public class MyHqlCast : HqlExpression
{
private MyHqlCast(IASTFactory factory, IEnumerable<HqlTreeNode> children)
: base(HqlSqlWalker.METHOD_CALL, "method", factory, children)
{
}
public static MyHqlCast Create(IASTFactory factory, HqlExpression expression,
string targetType)
{
return new MyHqlCast(factory,
new [] {
new HqlIdent(factory, "cast")),
new HqlExpressionList(factory, expression,
new HqlIdent(factory, targetType)),
});
}
}
Then derive a class from BaseHqlGeneratorForMethod. In its constructor, set the SupportedMethods property to the AsVarchar() method. Override the BuildHql() method. It should output the HQL cast constructs equivalent to cast(#param as varchar). Normally you would use the Cast() method on the treeBuilder parameter, but unfortunately this accepts just a System.Type, which isn't good enough for this case. Instead create and return an instance of your MyHqlCast:
return MyHqlCast.Create(new ASTFactory(new ASTTreeAdaptor()),
visitor.Visit(arguments[0]).AsExpression(),
"varchar");
Your implementation of BaseHqlGeneratorForMethod then needs to be registered by deriving from DefaultLinqToHqlGeneratorsRegistry. Call this.Merge(new MyGenerator()); in the constructor. Then register your registry type by
nhibernateConfiguration.LinqToHqlGeneratorsRegistry<MyRegistry>();