SQL - Procedure function - mysql

Question

Trying to create a Procedure to (Insert, Delete and, Update) values in employee_details.
CREATE DEFINER=`root`#`localhost` ALTER PROCEDURE `alter_employeedetails`(in employee_id int(11), employee_name VARCHAR(30), employee_join_date date,
employee_desgination varchar(30), employee_salary bigint(20), employee_address varchar(30),
employee_contact varchar(30), employee_email_id varchar(30)
BEGIN
IF #StatementType = 'Insert'
BEGIN
insert into employee_details values
(employee_id, employee_name, employee_join_date, employee_desgination, employee_salary, employee_address, employee_contact, employee_email_id)
END
IF #StatementType = 'Update'
BEGIN
UPDATE employee_details SET
(employee_name = #employee_name, employee_join_date = #employee_join_date, employee_designation = #employee_desgination,
employee_salary = #employee_salary, employee_address = #employee_address, employee_contact = #employee_contact, employee_email_id = #employee_email_id)
WHERE employee_id = #employee_id
END
else IF #StatementType = 'Delete'
BEGIN
DELETE FROM employee_details where employee_id = #employee_id
END
end

Answer 1

Quite a few errors in that code...
You forgot to prefix all the parameters with the "#" symbol.
Forgot to include "#StatementType" as a parameter.
Update had brackets around it.
You cannot specify int(11) (employee_id) or bigint(20)
(salary). It's either int / bigint (you don't specify the length
for int/bigint datatypes). And is salary correct as bigint? MSSQL has a "money"
datatype, or you could use decimal(8,2) or something similar. You
might be multiplying the salary by 100 to shift the decimal place for
all I know?
When inserting, do you really want to insert a employee Id? This would normally be an auto-incrementing primary key
Insert statement missing the fields you were populating. Required if using the "values" keyword like you had specified.
Hopefully this is closer to what you want.
ALTER PROCEDURE alter_employeedetails
(#StatementType as varchar(25), #employee_id int, #employee_name VARCHAR(30), #employee_join_date date,
#employee_designation varchar(30), #employee_salary bigint, #employee_address varchar(30),
#employee_contact varchar(30), #employee_email_id varchar(30))
AS
BEGIN
IF #StatementType = 'Insert'
BEGIN
insert into employee_details
(employee_id, employee_name, employee_join_date, employee_designation, employee_salary, employee_address, employee_contact, employee_email_id)
values
(#employee_id, #employee_name, #employee_join_date, #employee_designation, #employee_salary, #employee_address, #employee_contact, #employee_email_id)
END
ELSE IF #StatementType = 'Update'
BEGIN
UPDATE employee_details
SET
employee_name = #employee_name,
employee_join_date = #employee_join_date,
employee_designation = #employee_designation,
employee_salary = #employee_salary,
employee_address = #employee_address,
employee_contact = #employee_contact,
employee_email_id = #employee_email_id
WHERE employee_id = #employee_id
END
ELSE IF #StatementType = 'Delete'
BEGIN
DELETE FROM employee_details where employee_id = #employee_id
END
END