inserting a function value into a stored procedure parameter - mysql

Question

I'm having trouble calling a function and using the value from the function call within my stored procedure using mySQL. My function extracts a date value. I'm attempting to set the parameter values with my stored procedure call (parameters - data_transfer_id, mode). Is this possible?
Your help is appreciated. My code below is incorrect but is my start. The function name is kettle_data_transfer.f_DT_last_transfer (data_transfer_id, mode).
CREATE PROCEDURE `sproc_DT_consumer_answer_data`
(IN data_transfer_id bigint (20),
IN `mode` varchar(25)
)
BEGIN
DECLARE last_transfer date kettle_data_transfer.f_DT_last_transfer(data_transfer_id, mode);
SELECT
CEQ.consumer_ID
, EM.event_mapping_ID
, F.footprint_ID
, F.create_DTM as footprint_create_DTM
, EM.event_ID
, EL.brand_ID
, RELAT.activity_type_ID
, ED.event_ID as footprint_event_ID
FROM kettle_data_transfer.Event_Mappings EM
JOIN kettle_data_transfer.Consumer_Event_Queue CEQ ON CEQ.event_ID = EM.event_ID
JOIN efn.Footprints F ON F.consumer_ID = CEQ.consumer_ID
LEFT OUTER JOIN efn.Event_Days ED on ED.event_day_ID = F.event_day_ID
LEFT OUTER JOIN efn.R_Event_Location_Activity_Type RELAT ON RELAT.r_elat_ID = F.r_elat_ID
LEFT OUTER JOIN efn.Event_Locations EL on EL.event_location_ID = RELAT.event_location_ID
LEFT OUTER JOIN kettle_data_transfer.Records RR on RR.consumer_ID = CEQ.consumer_ID
WHERE EM.active_flag = 1
AND F.sample_flag = 0
AND RR.failure_code = 0
AND RR.`ignore` = 0
and (CEQ.modify_DTM > last_transfer OR EM.create_DTM > last_transfer)
and (RR.mode = `mode` OR EM.mode = `mode`)
and (RR.data_transfer_ID = data_transfer_id OR EM.data_transfer_ID = data_transfer_id )
and (RR.consumer_ID = CEQ.consumer_ID)
AND (ED.event_ID = CEQ.event_ID OR ED.event_ID is null)
GROUP BY CEQ.consumer_ID, EL.brand_ID
END

Answer 1

The syntax for stored program variable declarations:
DECLARE var_name [, var_name] ... type [DEFAULT value]
DEFAULT value is not saying "default value goes here." It's the keyword DEFAULT, followed by an expression containing the initial value for the variable.
You are trying to set the default initial value of the variable, but you have omitted the DEFAULT keyword after the variable name.
Adding it should resolve the issue.
https://dev.mysql.com/doc/refman/5.6/en/declare-local-variable.html