stored procedure syntax in mysql - mysql

Question

I am new to writing stored Procedures and I can't seem to find the error in this procedure.
The error is marked near the where part.
I tried looking for an example where the set is done based on a if condition but I can't seem to find such an example. Can anyone point me to my error?
DELIMITER $$
CREATE PROCEDURE `incubation`.`bt_voice_modification`
(in input_slot varchar(45),in input_port varchar(45))
BEGIN
SET #SVLAN_STH:=1000;
SET #SVLAN_DTH:=999;
SET #CVLAN_DTH:=1000;
SET #FLOW_INSTANCE:=1;
UPDATE one_2_one_table
SET L2S_USER_FLOW_INSTANCE = #FLOW_INSTANCE := #FLOW_INSTANCE+1;
SET L2S_NW_SLOT = input_slot;
SET L2S_NW_PORT = input_port;
IF STH_DTH = 'STH' then
set L2S_NW_SVLAN = #SVLAN_STH :=#SVLAN_STH + 1;
ELSE
set L2S_NW_SVLAN = #SVLAN_DTH ;
set L2S_NW_CVLAN = #CVLAN_DTH :=#CVLAN_DTH + 1;
END if;
WHERE IPDSLAM_USER_SLOT = 2 AND L2S_USER_TYPE like "%gplt%";
END

Answer 1

Your code suggest you don't have a very clear picture of how UPDATE statement works or the exact syntax. When you put a ;, it marks the end of the (UPDATE) statement. The syntax is - for one table:
UPDATE tableX
SET columnA = what_value_should_columnA-get ,
columnB = what_value_should_columnB_get ,
...
columnX = what_value_should_columnX_get
WHERE (conditions that restrict the rows that will be affected)
ORDER BY SomeColumn ; --- this can be used in MySQL only. Standard SQL
--- (and most DBMS) do not allow ORDER BY clause in
--- UPDATE statements. Since you are using variables
--- and the order of updating affects the updated values,
--- it's essential that you include an ordering.
So, your UPDATE would be something like:
UPDATE one_2_one_table
SET L2S_USER_FLOW_INSTANCE = #FLOW_INSTANCE := #FLOW_INSTANCE+1 ,
L2S_NW_SLOT = input_slot,
L2S_NW_PORT = input_port,
L2S_NW_SVLAN = CASE WHEN STH_DTH = 'STH'
THEN #SVLAN_STH := #SVLAN_STH + 1
ELSE #SVLAN_DTH
END ,
L2S_NW_CVLAN = CASE WHEN STH_DTH = 'STH'
THEN L2S_NW_CVLAN
ELSE #CVLAN_DTH := #CVLAN_DTH + 1
END
WHERE IPDSLAM_USER_SLOT = 2
AND L2S_USER_TYPE like '%gplt%'
ORDER BY SomeColumn ;