getInt (Function)
Function retrieves the int value specified in the given path of the JSON element.
Syntax
<INT> json:getInt(<STRING|OBJECT> json, <STRING> path)
Query Parameters
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| json | The JSON input containing int value. | STRING OBJECT | No | Yes | |
| path | The JSON path to fetch the int value. | STRING | No | Yes |
Example 1
@info(name = 'query1')
json:getLong(json,'$.id')
For a JSON object like {'name' : 'John', 'id' : 1234567890}, the function json:getLong(json,'$.id') searches for a long integer (a long) associated with the key id. If a matching value is present, it returns that value. In this example, it would return 1234567890.
Example 2
@info(name = 'query1')
json:getLong(json,'$.id')
The json:getLong(json,'$.id') function attempts to locate a long value in the json object at the path $.id. If there is no value at this location, or if the value isn't a long, the function returns null. For instance, given a JSON object such as {'name' : 'John', 'age' : 23}, the function returns null because there is no id key in the JSON object.
Example 3
@info(name = 'query1')
json:getLong(json,'$.name')
The json:getLong(json,'$.name') function attempts to find a long value in the json object at the path $.name. If the value at $.name isn't a long, or if no value is present, the function returns null. For example, given a JSON object such as {'name' : 'John', 'age' : 23}, the function returns null because the value at $.name is a string, not a long.
Example 4
CREATE STREAM InputStream (json string);
CREATE SINK STREAM AgeStream (name string, age int);
@info(name = 'ExtractAge')
INSERT INTO AgeStream
SELECT json:getString(json, '$.name') AS name, json:getInt(json, '$.age') AS age
FROM InputStream WINDOW TUMBLING_LENGTH(100);
This stream worker reads JSON strings from the InputStream and for each batch of 100 events, it extracts the name and age from the JSON string. The extracted data is then inserted into the AgeStream.
In the JSON string, it is expected that there are name and age fields for this query to function correctly. The json:getString(json, '$.name') function retrieves the name from the JSON string, and json:getInt(json, '$.age') retrieves the age. If the expected fields do not exist in the JSON string, null values will be inserted into the AgeStream.