{
"A1":{
"name":"Ad hoc",
"projectId":0
},
"X2":{
"name":"BBB",
"projectId":101
},
"AB":{
"name":"CCC",
"projectId":102
},
"recordsCount":3
}
For this JSON, how to extract values? i need output like,
A1, Ad hoc
X2, BBB
AB, CCC
experts inputs appreciated.
Analysis
XPath can't read unnamed attributes. It will always result in an exception. If you want to get the values, you need to use JsonPath.
Solution
Even then, it makes sense to add surrounding brackets, otherwise the first level will be consumed as well:
[
{
"A1":{
"name":"Ad hoc",
"projectId":0
},
"X2":{
"name":"BBB",
"projectId":101
},
"AB":{
"name":"CCC",
"projectId":102
},
"recordsCount":3
}
]
You can try the correct query on jsonpath.com. For me (with the additional brackets) the path $.* worked.
To extract the values, you need to use a tExtractJSONFields component in Talend if using a file or REST request.
A valid JSON query could be easily [0] for the field with alphanumeric identifiers.
Related
Given JSON like:
[
{
"Serial no": 994,
},
{
"Serial no": 456,
}
]
I know this query will give me an array of all Serial no values, in the order they are in the JSON: $..['Serial no']
I'm not sure exactly what sorting capabilities JSONPath has but I think you can use / and \ to sort - but how are they used to modify my query string in this case? I am only interested doing this in pure JSONPath, not JS or post-query sorting - that's easy, I just want to know if I can avoid it.
This is a source I found suggesting sorting is supported but it might be product-specific?
I'm using http://www.jsonquerytool.com/ to test this
I have a structure like this:
{"payload": {
"Item1": {
"property1": "Sunday",
"property2": "suffering_8890"
},
"Item2": {
"property1": "Monday",
"property2": "misery_0776"
},
"Item3": {
"property1": "Tuesday",
"property2": "pain_6756"
}
}
}
I need the property2 value that contains a certain sub-string (i.e- "misery"). Ultimately I just need the 4-digit code, but even getting the full value will work. I am able to get a list of all the property2 values by using:
$..property2
This returns:
Result[0] = suffering_8890
Result[1] = misery_0776
Result[2] = pain_6756
How do I filter it so that it only gives me the result containing the substring "misery"?
With regards to full value you can use a Filter Operator like:
$..[?(#.property2 =~ /misery.*?/i)].property2
Demo:
You can extract the 4-digit value out of the variable using Regular Expression Extractor
If you want to do this in one shot:
Add JSR223 PostProcessor as a child of the request which returns above JSON
Put the following code into "Script" area
vars.put('misery', ((com.jayway.jsonpath.JsonPath.read(prev.getResponseDataAsString(), '$..[?(#.property2 =~ /misery.*?/i)].property2').get(0) =~ ('(\\d+)'))[0][1]))
Refer the extracted value as ${misery} where required
More information: Apache Groovy - Why and How You Should Use It
You can use a regular expression extractor as well for the mentioned scenario to fetch the four-digit as below
property2": "misery_(.*)"
This will help you to save the four-digit code in JMeter variables right away. If you insist you to find out the required value from JSON using jsonpath, you can use JSON filter as below :-
$..[?(#.property2.indexOf('misery')>=0)]..property2
I've got JSON file that looks like this
{
"alliance":{
"name_part_1":[
"Ab",
"Aen",
"Zancl"
],
"name_part_2":[
"aca",
"acia",
"ythrae",
"ytos"
],
"name_part_3":[
"Alliance",
"Bond"
]
}
}
I want to store it in dynamoDB.
The thing is that I want a generator that would take random elements from fields like name_part_1, name_part_2 and others (number of name_parts_x is unlimited and overalls number of items in each parts might be several hundreds) and join them to create a complete word. Like
name_part_1[1] + name_part_2[10] + name_part[3]
My question is that what format I should use to do that effectively? Or NoSQL shouldn't be used for that? Should I refactor JSON for something like
{
"name": "alliance",
"parts": [ "name_part_1", "name_part_2", "name_part_3" ],
"values": [
{ "name_part_1" : [ "Ab ... ] }, { "name_part_2": [ "aca" ... ] }
]
}
This is a perfect use case for DynamoDB.
You can structure like this,
NameParts (Table)
namepart (partition key)
range (hash key)
namepart: name_part_1 range: 0 value: "Ab"
This way each name_part will have its own range and scalable. You can extend it to thousands or even millions.
You can do a batch getitem from the sdk of your choice and join those values.
REST API reference:
https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.html
Hope it helps.
You can just put the whole document as it is in DynamoDB and then use document path to access the elements you want.
Document Paths
In an expression, you use a document path to tell DynamoDB where to
find an attribute. For a top-level attribute, the document path is
simply the attribute name. For a nested attribute, you construct the
document path using dereference operators.
The following are some examples of document paths. (Refer to the item
shown in Specifying Item Attributes.)
A top-level scalar attribute: ProductDescription A top-level list
attribute. (This will return the entire list, not just some of the
elements.) RelatedItems The third element from the RelatedItems list.
(Remember that list elements are zero-based.) RelatedItems[2] The
front-view picture of the product. Pictures.FrontView All of the
five-star reviews. ProductReviews.FiveStar The first of the five-star
reviews. ProductReviews.FiveStar[0] Note The maximum depth for a
document path is 32. Therefore, the number of dereferences operators
in a path cannot exceed this limit.
Note that each document requires a unique Partition Key.
I'm a novice Couchbase user and I have a bucket which I've created that contains documents which are actually arrays in the form of:
{
"key": [
{
"data1": "somedata1"
},
{
"data2": "somedata2"
}
]
}
I want to query these documents via N1QL statements and have yet to find a solution to how to do this properly. More specifically, I would like to select fields inside each sub-document that is in an array of a certain key. For example, I would like to access: key.[1].data2 or key.[0].data1
How should I do it?
Couchbase has some reserved keywords that need to be escaped. In this case, key needs to be escaped. For example, if you're querying against my_bucket, then
SELECT my_bucket.`key`[0].data1 FROM my_bucket;
should return somedata1
I have this JSON array, but I don't know how display it.
{
"grupy": [{
"id_grupa_parametrow": "1",
"id_grupa_nadrzedna": "0",
"nazwa_grupy": "1_1",
"opis_grupy": "hdghgh",
"kolejnosc": "1233"
}]
}
I tried:
result["grupy"].id_grupa_parametrow;
but it doesn't work.
You can use some online json editors to find your data easily. Anyway, you have an array defined for groupy index. So, use numerical indexes first:
result["grupy"][0].id_grupa_parametrow;
What you have to know is that {} means that it's an object and [] is an array. So result in an object which has grupy property - that's why you have to use a dot here - result.grupy.
grupy is an array to you should use [0] index - result.grupy[0].
And so on...
This is the right way in this case:
result.grupy[0].id_grupa_parametrow;
result.grupy[0].id_grupa_parametrow;