Increment by N, return previous¶
Atomically adds the given value to the current value and returns the previous value of the counter. It is possible that multiple concurrent client requests may receive the same previous value. This occurs since only the incrementing part of the logic is atomic, the retrieval of the value before it is incremented is not.
xxxx.backendless.app is a subdomain assigned to your application. For more information see the Client-side Setup section of this documentation.
||Name of the counter to update.|
||Number to add to the current counter value.|
user-token: optional value obtained as a result of the login operation.
||Optional header. Contains a value returned by Backendless in a preceding user Login API call. The operation will be executed with the security policy associated currently logged in user. This means all permissions associated with the user and the roles assigned to the user will be enforced by Backendless.|
Numeric value - previous value of the counter
Make sure to replace xxxx in the domain name in the sample request below to the one assigned to your application.
curl -X PUT \ https://xxxx.backendless.app/api/counters/mycounter/get/incrementby?value=1000
||Name of the counter whose value must be incremented.|
||Specify the number to increment the value by.|
||When this box is checked, the operation returns the previous value of the counter.|
Returns the previous value of the counter.
Consider the following counter:
The example below increments the value of the
20. This operation returns
0, since the
return previous value box is checked. To avoid confusion, the value was incremented by
20, even though the return value is
The result of this operation will look as shown below after the Codeless logic runs: