I would like to turn this resultset
[
{
"Document": {
"JsonData": "{\"key\":\"value1\"}"
}
},
{
"Document": {
"JsonData": "{\"key\":\"value2\"}"
}
}
]
into this
[
{
"key": "value1"
},
{
"key": "value2"
}
]
I can get close by using a query like
select value c.Document.JsonData from c
however, I end up with
[
"{\"key\":\"value1\"}",
"{\"key\":\"value2\"}"
]
How can I cast each value to an individual JSON fragment using the SQL API?
As David Makogon said above, we need to transform such data within our app. We can do as below:
string data = "[{\"key\":\"value1\"},{\"key\":\"value2\"}]";
List<Object> t = JsonConvert.DeserializeObject<List<Object>>(data);
string jsonData = JsonConvert.SerializeObject(t);
Screenshot of result:
Related
Question:
I am trying SQL query as the image showed below，I want it to be grouped by the same timestamp
expected output:
[
{
"tag1": {
"TagName": "PV1-input-power-L(10W)",
"Value": 0
},
"tag2": {
"TagName": "Sunshine-Display-Value",
"Value": 0
},
"tag3": {
"TagName": "TotalEnergy-(100kWh)_1",
"Value": 0
},
"timestamp": "2020-03-27T02:40:18Z"
}
]
sample document:
You can use User Defined Functions.
Here is the data from my containers
Here is the function I have created. I named it CustomArray.
function userDefinedFunction(input){
var obj={};
input.forEach(function(element,index){
obj["tag"+index] = {
TagName :element.TagName,
Value: element.Value
};
}); return obj;}
Here, I run the UDF with my select statement
It returns the following data.
Schema is very close to what you are looking for. I think you can make it better by changing some jscript in UDF.
I hope this helps!
I have a data structure which have multiple nested keys, key1 and key2.
The value of key1 and key2 is unknown and will typically be some GUID's.
How do I get the data out of this structure?
"key1":
{
"key2": {
"name1":"value1",
"name2":"value2",
"sub1":
{
"sub1_name1":"sub1_value1",
"sub2_name2":"sub2_value2"
},
"name3":"value3"
}
}, .... more records following
I have the following code that extracts some data but after that I am unable to query the data:
admin.database().ref('table_x/').once('value', (snapshot) => {
console.log(snapshot.key); //table_x
snapshot.forEach(function(child) {
var key1 = child.key; // this gives key1
// get key 2
// get key 2's values, children
Something like this?
for (key in child) {
for (innerkey in child[key]) {
console.log(innerkey);
}
}
https://jsfiddle.net/chickenbeef/ycers98g
Use the library Defiantjs(http://defiantjs.com/) they have a nice implementation of an xslt template to pull in your data set
once you able to loop through your data structure, use the xpath tool provided by the library to run specific queries.
Example of JSON.search
data = [{
"key1": {
"key2": {
"name1": "value1",
"name2": "value2",
"sub1": {
"sub1_name1": "sub1_value1",
"sub2_name2": "sub2_value2"
},
"name3": "value3"
}
}}],
res1 = JSON.search(data, "//*[contains(name(), 'key')]/."),
res2 = JSON.search(data, "//*[contains(text(), 'sub')]/..");
https://jsfiddle.net/edsonvanwyk/amanp3g0/4/
I can't seem to find how to correctly call PutItem for a StringSet in DynamoDB through API Gateway. If I call it like I would for a List of Maps, then I get objects returned. Example data is below.
{
"eventId": "Lorem",
"eventName": "Lorem",
"companies": [
{
"companyId": "Lorem",
"companyName": "Lorem"
}
],
"eventTags": [
"Lorem",
"Lorem"
]
}
And my example template call for companies:
"companies" : {
"L": [
#foreach($elem in $inputRoot.companies) {
"M": {
"companyId": {
"S": "$elem.companyId"
},
"companyName": {
"S": "$elem.companyName"
}
}
} #if($foreach.hasNext),#end
#end
]
}
I've tried to call it with String Set listed, but it errors out still and tells me that "Start of structure or map found where not expected" or that serialization failed.
"eventTags" : {
"SS": [
#foreach($elem in $inputRoot.eventTags) {
"S":"$elem"
} #if($foreach.hasNext),#end
#end
]
}
What is the proper way to call PutItem for converting an array of strings to a String Set?
If you are using JavaScript AWS SDK, you can use document client API (docClient.createSet) to store the SET data type.
docClient.createSet - converts the array into SET data type
var docClient = new AWS.DynamoDB.DocumentClient();
var params = {
TableName:table,
Item:{
"yearkey": year,
"title": title
"product" : docClient.createSet(['milk','veg'])
}
};
I want to save all data of a form.
My form has these elements-
( Using Postman Plugin )
My controller is like this-
[HttpPost]
public async Task<IActionResult> Insert(IFormCollection data)
{
return Ok(data);
}
So, I am getting something like this-
[
{
"key": "user_id",
"value": [
"'12'"
]
},
{
"key": "title",
"value": [
"123"
]
},
{
"key": "text[]",
"value": [
"werwer",
"ghj"
]
}
]
I want to get the value of texts.
So, for this case-
"werwer",
"ghj"
So, I have tried something like this-
foreach (string description in data["text"])
{
// description => empty
}
and also tried this-
data.text
and also-
data->text
But nothing works for me.
Can anyone please help?
Thanks in advance for helping.
Why not loop through each keys and if the key is "text", get the values. Since the value is a comma seperated string, you can call the Split method on that to get an array which contains 2 items( from your sample input).
foreach (string description in data.Keys)
{
if (description.Equals("text"))
{
var v = data[description];
var stringItems = v.Split(',');
foreach (var stringItem in stringItems)
{
//do something with stringItem
}
}
}
BTW, the key should be text, not text[]. Even if you have muliple input fields with the same name "text", when you submit, It will be a single key ("text") with 2 items int he value property
{
"key": "text",
"value": [
"werwer",
"ghj"
]
}
I am using the POST function in httr library to get some data and the code is shown below.
library(httr)
url = "https://xxxx:xxx#api.xxx/_search" #omitted for privacy
a = POST(url,body = query,encode = "json")
The query is shown below in the appendix. a$content is giving me a whole bunch of a hexadecimal numbers on which I have to use another function before I can get some useful data.
Ultimately I wish to get a data frame by using b = fromJSON(a$content). So far in order to get any data I have to use:
chr<-function(n){rawToChar(as.raw(n))}
b = jsonlite::fromJSON(chr(a$content))
data = b$hits$hits$`_source`
This seems inefficient considering that I am parsing in the data through a local function to get the final data. So my questions are as follows:
Am I using the POST function correctly to get the query?
Is there a more efficient (faster) way of getting my data into a data frame?
Appendix:
query = '
{
"_source": [
"start","source.country_codes",
"dest.country_codes"
],
"size": 100,
"query": {
"bool": {
"must": [
{
"bool": {
"must_not": [
{
"range": {
"start": {
"lte": "2013-01-01T00:00:00"
}
}
},
{
"range": {
"start": {
"gt": "2016-05-19T00:00:00"
}
}
}
]
}
}
]
}
}
}'
POST function looks good.
js<-fromJSON(content(a,as="text"))