MySql Stored Procedure : Get Last Inserted Id - mysql

Question

My Procedure :
DELIMITER $$
CREATE PROCEDURE `******`.`*********************`
( IN customerName varchar(100),IN customerEmail varchar(100),IN address1 varchar(100),IN address2 varchar(100),
IN zip int,IN city varchar(100),IN state varchar(100),IN country varchar(100),IN region varchar(100),OUT customerId int)
BEGIN
Declare custId int default 0;
Declare zipExist int default 0;
Select Count(*) into zipExist from *****.********** where Zip_Code = zip;
if zipExist = 0 then
Insert into *****.**********(Zip_Code,City,State,Country,Region) values(zip,city,state,country,region);
end if;
Insert into *****.**********(Address_1,Address_2,ZIP_Code) values(address1,address2,zip);
SET custId = LAST_INSERT_ID();
if custId > 0 then
Insert into *****.**********(Customer_Name,Customer_Email,Address) values(customerName,customerEmail,custId);
end if;
SET customerId = LAST_INSERT_ID();
END $$
on calling the procedure I am getting this error:
Error Code: 1062. Duplicate entry '1' for key 'PRIMARY'
I am assuming that custId= Last_Insert_Id(); this line is giving me wrong inserted id. hence it is not able to insert into last table.
I would like to know how to get last inserted id after insert.(Address_id is auto-increment).
tables are :
Customer:
CustomerId int auto-increment,
CustomerName varchar,
CustomerEmail varchar,
AddressId int fk references address.AddressId
Address :
AddressId pk int auto-increment,
Address1 varchar,
Address2 varchar,
zip int fk references zipmaster.zip
zipmaster :
zip int pk auto-increment,
city varchar,
state varchar,
country varchar

Answer 1

LAST_INSERT_ID() returns only automatically generated AUTO_INCREMENT values, if the customer_id is not auto-increment you will not get the correct value.
For more information please refer the link :
http://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_last-insert-id