i have a list of horse race result in my database.
In my database, i have 3 table :
horse (cheval in french) with : id, name ...
race (course in french) with : id, name ...
and resultrace (resultatcourse in french) the id of the horse (cheval) and the id of the race (course) and position in the race(first, second ...)
When i want to use it in a NgFor to do a list of all my race, who can i can use only the race's name, the horse's name and his position ?
My JSON:
[
{id: 1, nom: "Valdack", place: 2, course: 1},
{id: 5, nom: "Flying fox", place: 1, course: 1},
{id: 17, nom: "Dane Dream", place: 4, course: 1}
]
My html code :
<ion-item *ngFor="let item of items; ">
<h2>{{ item.nom (name of the race) }} | {{ item.nom (name of the horse) }} | N°{{ item.place }} </h2>
</ion-item>
My php :
try {
$stmt = $pdo->query('SELECT course.id, course.nom , cheval.id, cheval.nom , resultatcourse.place, resultatcourse.course, resultatcourse.place FROM course, cheval, resultatcourse WHERE resultatcourse.course = course.id AND resultatcourse.cheval = cheval.id');
while($row = $stmt->fetch(PDO::FETCH_OBJ))
{
// Assign each row of data to associative array
$data[] = $row;
}
// Return data as JSON
echo json_encode($data);
}
catch(PDOException $e)
{
echo $e->getMessage();
}
And my java :
load() : void
{
this.http.get('http://localhost/wequida/retrieve-resultatcourse.php').subscribe((data : any) =>
{
console.dir(data);
this.items = data;
},
(error : any) =>
{
console.dir(error);
});
}
My table horse and my table race have 2 same columns : id and name, maybe it's the problem ?
I find the solution ! (Thk user184994 !)
In my php :
try {
$stmt = $pdo->query('SELECT course.id, course.nom as coursenom, cheval.id, cheval.nom as chevalnom, resultatcourse.place, resultatcourse.course, resultatcourse.place FROM course, cheval, resultatcourse WHERE resultatcourse.course = course.id AND resultatcourse.cheval = cheval.id');
while($row = $stmt->fetch(PDO::FETCH_OBJ))
{
// Assign each row of data to associative array
$data[] = $row;
}
// Return data as JSON
echo json_encode($data);
}
catch(PDOException $e)
{
echo $e->getMessage();
}
I had an as to differentiate horse's name and race's name
In my html :
<ion-item *ngFor="let item of items; ">
<h2>{{ item.coursenom }} | {{ item.chevalnom }} | N°{{ item.place }} </h2>
</ion-icon></button>
</ion-item>
I use the as name
Related
I'm trying to construct a HashMap from below array
product: [
{
id: 12345
qty: 5
},
{
id: 12345
qty: 6
},
{
id: 98765
qty: 10
}
]
code:
HashMap<Long, Integer> productMap = new HashMap<>();
int totalQty = 0;
for (Product product : products) {
Long id = product.getId();
if (productMap.containsKey(id)) {
productMap.put(id, totalQty + productMap.get(id).intValue());
} else {
productMap.put(id, totalQty);
}
}
from the above method I'm checking the key from the map, if yes add the qty to the totalQty by overriding the existing key, any best approach to not override the while summing the values ??
you can do like this:
products.stream().collect(toMap(Product::getId,Product::getQty,Intger::sum));
data in mongo :
enter image description here
db.test2.aggregate([
{
"$project" : {
"contents" : 1,
"comments" : {
"$filter" : {
"input" : "$comments",
"as" : "item",
"cond" : {"$gt" : ['$$item.score', 2]}
},
},
"comments2" : {
"$filter" : {
"input" : "$comments2",
"as" : "item",
"cond" : {"$gt" : ["$$item.score", 5]}
}
}
}
},
{
"$project" : {
"content" : 1,
"commentsTotal" : {
"$reduce" : {
"input" : "$comments",
"initialValue" : 0,
"in" : {"$add" : ["$$value", "$$this.score"]}
}
},
"comments2Total" : {
"$reduce" : {
"input" : "$comments2",
"initialValue" : 0,
"in" : {"$add" : ["$$value", "$$this.score"]}
}
}
}
},
{$skip : 0},
{$limit: 3}
]);
<!-- language: lang-json-->
So you can see, this does the following :
1、filter the comments and comments2 which score is gt 5.
2、count total of the socre in comment array.
and i write the aggregation query in Spring like this:
AggregationExpression reduce = ArithmeticOperators.Add.valueOf("$$value").add("$$this.socre");
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.project().andExclude("_id")
.andInclude("content")
.and("comments").filter("item", ComparisonOperators.Gt.valueOf("item.score").greaterThanValue(3)).as("comments")
.and("comments2").filter("item", ComparisonOperators.Gt.valueOf("item.score").greaterThanValue(3)).as("comments2"),
Aggregation.project("comments", "comments2")
.and(ArrayOperators.Reduce.arrayOf("comments").withInitialValue("0").reduce(reduce)).as("commentsTotal")
);
when i run like up , it will throws exception :
java.lang.IllegalArgumentException: Invalid reference '$$value'!
You can try below aggregation by wrapping $filter inside the $reduce operation.
Something like below
AggregationExpression reduce1 = new AggregationExpression() {
#Override
public DBObject toDbObject(AggregationOperationContext aggregationOperationContext) {
DBObject filter = new BasicDBObject("$filter", new BasicDBObject("input", "$comments").append("as", "item").append("cond",
new BasicDBObject("$gt", Arrays.<Object>asList("$$item.score", 2))));
DBObject reduce = new BasicDBObject("input", filter).append("initialValue", 0).append("in", new BasicDBObject("$add", Arrays.asList("$$value", "$$this.socre")));
return new BasicDBObject("$reduce", reduce);
}
};
Aggregation aggregation = newAggregation(
Aggregation.project().andExclude("_id")
.andInclude("content")
.and(reduce1).as("commentsTotal")
);
This is an old question, but in case some one winds up here like me, here's how I was able to solve it.
You cannot access "$$this" and "$$value" variables directly like this in spring.
AggregationExpression reduce = ArithmeticOperators.Add.valueOf("$$value").add("$$this.socre");
To do this we have to use reduce variable enum, like this:
AggregationExpression reduce = ArithmeticOperators.Add.valueOf(ArrayOperators.Reduce.Variable.VALUE.getTarget()).add(ArrayOperators.Reduce.Variable.THIS.referringTo("score").getTarget());
Hope this helps!
I had to solve next task and hadn't find any solutions. So i hope my answer will help somebody.
User with roles (user have list of rights + list of roles, each role have own list of rights, needed to find full list of rights):
user structure
role structure
First, i lookup roles to roleDto (for example), then i collect rights from roles to 1 list:
ArrayOperators.Reduce reduce = ArrayOperators.Reduce.arrayOf("$roleDto.rights")
.withInitialValue(new ArrayList<>())
.reduce(ArrayOperators.ConcatArrays.arrayOf("$$value").concat("$$this"));
As result in reduce i have this 1 list of rights collected from roles.
After that i make:
SetOperators.SetUnion.arrayAsSet(reduce).union("$rights")
using previous result. Result type is AggregationExpression because AbstractAggregationExpression implements AggregationExpression.
So, finally i get smth like this (sorry for messy code):
private static AggregationExpression getAllRightsForUser() {
// concat rights from list of roles (each role have list of rights) - list of list to list
ArrayOperators.Reduce reduce = ArrayOperators.Reduce.arrayOf("$roleDto.rights")
.withInitialValue(new ArrayList<>())
.reduce(ArrayOperators.ConcatArrays.arrayOf("$$value").concat("$$this"));
// union result with user.rights
return SetOperators.SetUnion.arrayAsSet(reduce).union("$rights");
}
Result of this operation can be finally used somewhere like here ;) :
public static AggregationOperation addFieldOperation(AggregationExpression aggregationExpression, String fieldName) {
return aoc -> new Document("$addFields", new Document(fieldName, aggregationExpression.toDocument(aoc)));
}
I had the same issue, one of the solutions is to create a custom Reduce function, here's Union example:
public class SetUnionReduceExpression implements AggregationExpression {
#Override
public Document toDocument(AggregationOperationContext context) {
return new Document("$setUnion", ImmutableList.of("$$value", "$$this"));
}
}
I'm trying to read my MySQL data and put it as JSON. But I just want a single JSON Object, it tries giving me a JSONArray, but that array is empty.
This is what it gives me, top is JSON, bottom is simple array.
[
[],
{
"id": "1",
"description": null,
"copyright": "© Ian Ransley, flickr.com\/CC BY 2.0"
}
]
Array
(
[0] => Array
(
)
[1] => Array
(
[id] => 1
[description] =>
[copyright] => © Ian Ransley, flickr.com/CC BY 2.0
)
)
As you can see, the zero index is empty for some reason, and right before my object starts there is an opening and closing bracket ([]), which makes my android app recognize that as an array instead of object.
here's my php code:
<?php
header('Content-type: text/plain');
$connection = mysqli_connect("localhost", "bananatime", "Yoyobanana", "bananatime")
or die("Error " . mysqli_error($connection));
if(isset($_GET['id'])){
$sql = "SELECT * FROM bananas WHERE id = '".$_GET['id']."' ORDER BY id";
}else{
$sql = "SELECT * FROM bananas ORDER BY id";
}
$result = mysqli_query($connection, $sql) or die("Error in Selecting " .mysqli_error($connection));
$array[] = array();
while($row = mysqli_fetch_array($result, MYSQL_ASSOC))
{
array_push($array, $row);
}
array_values($array);
echo json_encode($array, JSON_PRETTY_PRINT);
echo "\n\n";
print_r($array);
mysqli_close($connection);
?>
change $array[] = array(); to $array = array();
array_push() was the problem. I had to use $array = $row;
I have 300,000 documents in this specific collection.
Each document is considered as one taxi trip.
Each document contains a TaxiStation number and a License number.
My goal is to figure out the number of trips per TaxiLicense per TaxiStation.
For example:
TaxiStation A License X had 5 trips.
TaxiStation A License Y had 9 trips. And so on.
How can I optimize my query? It is takes an upwards time of 30 minutes to complete!
List /*of*/ taxistationOfCollection, taxiLicenseOfTaxistation;
//Here I get all the distinct TaxiStation numbers in the collection
taxistationOfCollection = coll.distinct("TaxiStation");
BasicDBObject query, tripquery;
int tripcount;
//Now I have to loop through each Taxi Station
for(int i = 0; i<taxistationOfCollection.size(); i++)
{
query = new BasicDBObject("TaxiStation", taxistationOfCollection.get(i));
//Here, I make a list of each distinct Taxi License in the current Taxi station
taxiLicenseOfTaxistation = coll.distinct("TaxiLicense", query);
//Now I make a loop to process each Taxi License within the current Taxi station
for(int k = 0; k<taxiLicenseOfTaxistation.size();k++)
{
tripcount=0;
if(taxiLicenseOfTaxistation.get(k) !=null)
{
//I'm looking for each Taxi Station with this Taxi License
tripquery= new BasicDBObject("TaxiStation", taxistationOfCollection.get(i)).append("TaxiLicense", taxiLicenseOfTaxistation.get(k));
DBCursor cursor = coll.find(tripquery);
try {
while(cursor.hasNext()) {
//Increasing my counter everytime I find a match
tripcount++;
cursor.next();
}
} finally {
//Finally printing the results
System.out.println("Station: " + taxistationOfCollection.get(i) + " License:" + taxiLicenseOfTaxistation.get(k)
+ " Trips: " + tripcount);
}
}
}
}
Sample Document :
{
"_id" : ObjectId("53df46ed9b2ed78fb7ca4f23"),
"Version" : "2",
"Display" : [],
"Generated" : "2014-08-04,16:40:05",
"GetOff" : "2014-08-04,16:40:05",
"GetOffCellInfo" : "46001,43027,11237298",
"Undisplay" : [],
"TaxiStation" : "0000",
"GetOn" : "2014-08-04,16:40:03",
"GetOnCellInfo" : "46001,43027,11237298",
"TaxiLicense" : "000000",
"TUID" : "26921876-3bd5-432e-a014-df0fb26c0e6c",
"IMSI" : "460018571356892",
"MCU" : "CM8001MA121225V1",
"System_ID" : "000",
"MeterGetOffTime" : "",
"MeterGetOnTime" : "",
"Setup" : [],
"MeterSID" : "",
"MeterWaitTime" : "",
"OS" : "4.2",
"PackageVersion" : "201407300888",
"PublishVersion" : "201312060943",
"SWVersion" : "rel_touchbox_20101010",
"MeterMile" : 0,
"MeterCharged" : 0,
"GetOnLongitude" : 0,
"GetOnLatitude" : 0,
"GetOffLongitude" : 0,
"TripLength" : 2,
"GetOffLatitude" : 0,
"Clicks" : 0,
"updateTime" : "2014-08-04 16:40:10"
}
Aggregation is probably what you are looking for. With an aggregation operation your whole code runs on the database and can be performed in a few lines. Performance should also be a lot better since the database handles everything that needs to be done an can take full advantage of indexes and other stuff.
From what you postet this boils down to a simple $group operation. In the shell this would look like:
db.taxistationOfCollection.aggregate([
{$group:
{ _id:
{station: "$TaxiStation",
licence: "$TaxiLicense"},
count : {$sum : 1}
}
])
This will give you documents of the form
{_id : {station: stationid, licence: licence_number}, count: number_of_documents}
For Java it would look like this:
DBObject taxigroup = new BasicDBObject("$group",
new BasicDBObject("_id",
new BasicDBObject("station","$TaxiStation")
.append("Licence","$TaxiLicense"))
.append("count", new BasicDBObject("$sum",1)));
AggregationOutput aggout = taxistationOfCollection.aggregate(
Arrays.asList(taxigroup));
Please note that the code snippets are not tested.
I have a simple SOQL query in java for extracting Salesforce standard object as follows -
String soqlQuery = "SELECT FirstName, LastName FROM Contact";
QueryResult qr = connection.query(soqlQuery);
I want to get the datatype of the object fields.
I have written a small function below which will provide the list of Phone fields and its label present in a Custom or Standard Object of your Salesforce ORG. I hope this might help you in writing the business logic for your code.
public list<String> getFieldsForSelectedObject(){
selectedPhoneNumber = ''; //to reset home number field
list<String> fieldsName = new list<String>();
selectedObject = 'Object Name' // This should have the object name for which we want to get the fields type
schemaMap = Schema.getGlobalDescribe(); //Populating the schema map
try{
if(selectedObject != null || selectedObject != '' || selectedObject != '--Select Object--'){
Map<String, Schema.SObjectField> fieldMap = schemaMap.get(selectedObject).getDescribe().fields.getMap();
for(Schema.SObjectField sfield : fieldMap.Values()){
schema.describefieldresult dfield = sfield.getDescribe();
schema.Displaytype disfield= dfield.getType();
system.debug('#######' + dfield );
if(dfield.getType() == Schema.displayType.Phone){// Over here I am trying to findout all the PHONE Type fields in the object(Both Custom/Standard)
fieldsName.add('Name:'+dfield.getName() +' Label:'+ dfield.getLabel ());
}
}
}
}catch(Exception ex){
apexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'There is no Phone or Fax Field Exist for selected Object!'));
}
return fieldsName;
}
Sample OUTPUT List of String::
Name: Home_Phone__c Label: Home Phone
Name: Office_Phone__c Label: Office Phone
Say that we have the below soql.
select FirstName,LastName from Contact limit 2
The query result in the QueryResult object looks like below.
{
[2]XmlObject
{
name={urn:partner.soap.sforce.com}records, value=null, children=
[
XmlObject{name={urn:sobject.partner.soap.sforce.com}type, value=Contact, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}Id, value=null, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}FirstName, value=Bill, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}LastName, value=Gates, children=[]}
]
},
XmlObject
{
name={urn:partner.soap.sforce.com}records, value=null, children=
[
XmlObject{name={urn:sobject.partner.soap.sforce.com}type, value=Contact, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}Id, value=null, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}FirstName, value=Alan, children=[]},
XmlObject{name={urn:sobject.partner.soap.sforce.com}LastName, value=Donald, children=[]}
]
},
}
In order to parse the QueryResult and to take column names, I have implemented the below method that will return the column names in comma separated String. I have mentioned the logic inside the code.
public String getColumnNames(QueryResult soqlResponse)
{
String columns = ""
try
{
// We are looping inorder to pick the 1st record from the QueryResult
for (SObject record : soqlResponse.getRecords())
{
Iterator<XmlObject> xmlList = record.getChildren();
int counterXml = 0;
while(xmlList.hasNext())
{
XmlObject xObj = xmlList.next();
// Since the 1st 2 nodes contains metadata of some other information, we are starting from the 3rd node only
if(counterXml > 1)
{
columns += xObj.getName().getLocalPart() + ",";
}
counterXml++;
}
// Since we can get the column names from the 1st record, we are breaking the loop after the data of 1st record is read
break;
}
// We are removing the last comma in the string
columns = columns.substring(0, columns.length() - 1);
}
catch(Exception ex)
{
}
return columns;
}