Declaration

ok, ret_value, info = UpdateData(key, updateFunction)

Parameters

Parameter Name	Type	Description
key	string	Key of the data to be updated.
updateFunction	updateFunction(currentValue, ParaDataInfo info) {return newValue, new_options}	Function used for updating the data.

Return Values

Response Name	Type	Description
ok	int	If the value is 0, the operation is successful. The subsequent fields are the updated value and detailed information.
value	number, boolean, string, or table containing only these types	If the operation is successful, the updated value is returned. Otherwise, an error message is returned.
info	ParaDataInfo	If the operation is successful, the detailed information (such as version and metadata) is returned.

Description

Updates the data corresponding to a key through a callback function. The callback function gets the current value and returns the new value based on the defined logic. The callback function cannot be paused once executed.

Callback Function Signature

newValue, newOptions updateFunction(currentValue, info)

Parameters

Parameter Name	Type	Description
currentValue	number, boolean, string, or table containing only these types	Current value.
info	ParaDataInfo	Additional information about the current value.
newValue	number, boolean, string, or table containing only these types	Expected new value.
newOptions	ParaDataSetOptions	Metadata expected to be stored.

Description

Updates data with a function.