The above reference from Stack Exchange is a little dated (2016). Remember that in the first lesson in this module, you learned about RESTful APIs. First, the cardinality of the "calibrated" event attribute needs be changed from, One advantage to handling each "calibrated" element as a variable length array is that individual records are not required to have the same number of maintenance date/time values recorded. Data Tip: The GEOJSON data structure is a powerful data structure that supports spatial data. The following functions and procedures enable you to retrieve the value of the JSON array: The get function has reference semantics. You will also explore the machine readable JSON data structure. In the first illustration above, sensor 5416 has only been calibrated once, but the other two sensors have been calibrated multiple times. When I first mentioned configuring a Receive JSON on a REST Endpoint input to allow the illustrated block of JSON to be ingested into GeoEvent Server for processing, I indicated that the JSON Object Name property should be left unspecified. For GeoEvent Server, it is important that both the array have a name and that each object within the array have a homogeneous structure, meaning that every event record should, generally speaking, use a common schema or collection of name/value pairs to communicate the item's data.
GeoEvent Server does require that every value in the array be the same type (e.g. Second, you would need to remove the TIME_START tag from the element. JSON_ELEMENT_T is the supertype for the JSON_OBJECT_T, JSON_SCALAR_T, and JSON_ARRAY_T object types. Is it possible to reference this data using something like "data.stations.station_id" for example? Refine R Markdown Reports with Images and Basemaps, 5. JSON is an ideal format for larger data that have a hierarchical structured relationship. JSON records can contain structures called objects and arrays. The description of how the "JSON Object Name" is used was a great help and was difficult to find anywhere else. The parse function takes a JSON string as input and sets up an internal representation of the JSON data. Thank you so much for this post. If the array were a list of simple integers the data would look something like: The data elements in the illustration above are not simple integers. These procedures insert (not overwrite) at the specified position unless overwrite is requested. JSON_OBJECT_T is a subtype of the JSON_ELEMENT_T object type. HAve you been able to crack that one? This tool uses JavaScript and much of it will not work correctly without it enabled. The input LOB cannot be NULL. JSON Data - A Name and a Value JSON data is written as name/value pairs. Assuming extraction of the most recent calibration date was required, your best option in this case would be to use the ArcGIS GeoEvent Server SDK to develop a custom processor which implemented a list iterator, or work with the data provider to see if the data schema could be modified to provide the most recent calibration date as a data value whose cardinality was One rather than Many. This specifies that chaya is a string (characters rather than numeric). GeoEvent Server does require that every value in the array be the same type (e.g. Typically, when a data vendor sends event data formatted as JSON, there will be multiple event records organized within a list such as this: There are three elements, or objects, in the block of JSON data illustrated above. Machine readable data structures are more efficient - particularly for larger data that contain hierarchical structures. The array is enclosed within a pair of square brackets: "items": [ ... ], If the array were a list of simple integers the data would look something like: "values": [ 1, 3, 5, 7, 9 ]. Please also consider, "{""x"":32.125,""y"":-117.125,""spatialReference"":{""wkid"":4326}}". The data elements in the illustration above are not simple integers. The input has to specify a JSON object, not an array. Reference semantics is changed to value semantics. Jive Software Version: 2018.25.0.0_jx, revision: 20200515130928.787d0e3.release_2018.25.0-jx, When speaking with customers who want to get started with ArcGIS GeoEvent Server, I'm often asked if GeoEvent Server has an. In this case, you would specify "items" as the root node of the data structure. JSON is text, written with JavaScript object notation. GEOJSON can be used to create maps just like shapefiles can. Long, String, Date, ..., or Group), but that's not an issue in this case as all the values are epoch long integer representations of date values in milliseconds. For example, you can specify 7 to indicate a combination of 3 and 4. You can create an empty JSON_ARRAY_T instance using the following constructor. Does the "calibrated" attribute's type change from. JSON_ELEMENT_T Object Type. Database PL/SQL Packages and Types Reference. The following procedures enable you to set the value at the specified position in the JSON array. Notice the cardinality of … The GET_CLOB and GET_BLOB procedures, which accept a CLOB or BLOB as input, enable you to provide a LOB to be used as serialization destination. https://www.earthdatascience.org/.../get-data-using-apis/intro-to-JSON Ideally, you want to be able to answer two integration questions: For example, an input can be configured to accept data sent to a GeoEvent Server hosted REST endpoint. In the example above, you can create a copy of the âaddressâ object by replacing this line: After this, changing the address with have no effect on the value of the âdataâ containing object. What does a typical JSON data record look like? This implies that in addition to the structure being multi-cardinal, it's also organized as a group of elements, which in JSON is typically an array. If you've no influence over the data provider, you might want to consider writing a Python script (or something similar) to take the data being offered and restructure it into something that GeoEvent Server is able to ingest. APIs are powerful ways to access data and more specifically the specific type and subset of data that you need for your analysis, programmatically. Long, String, Date, ..., or Group), but that's not an issue in this case as all the values are epoch long integer representations of date values in milliseconds. JSON defines only two data structures: objects and arrays. If you make this change to our input, and delete the GeoEvent Definition it created the last time the JSON data was received, you will get a slightly different GeoEvent Definition generated as illustrated below: The first thing you should notice, when the illustrated block of JSON data is sent to the input, is the input's event count increments by three -- indicating that three event records were received by GeoEvent Server. How is the data being sent to a GeoEvent Server input?
This is similar to column headings in a .csv. The example below walks through the items of the varray to build a JSON_ARRAY_T object that contains all key names.
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