Sql procedures and functions

script.sql

// -----------------------------------------------------//
// CREATION OF SCHEMA
// -----------------------------------------------------//

CREATE TABLE IF NOT EXISTS user_permissions (
    id int NOT NULL,
    permission_name varchar(50) NOT NULL,
    PRIMARY KEY (id)
);



CREATE TABLE IF NOT EXISTS user_roles (
    id int NOT NULL,
    user_role varchar(50) NOT NULL,
    perm_id int,
    PRIMARY KEY (id),
    FOREIGN KEY (perm_id) REFERENCES user_permissions(id)
   
);

CREATE TABLE IF NOT EXISTS user_table(
id int NOT NULL,
name varchar(255),
age int,
city varchar(255),
role_id int,
primary KEY(id),
 FOREIGN KEY (role_id) REFERENCES user_roles(id)
);

// -----------------------------------------------------//
// PROCEDURES
// -----------------------------------------------------//

CREATE or replace PROCEDURE createUser(name varchar(250), age integer, city varchar(250), roleName varchar(250), permissions varchar(250))
as $$
declare 
tempVar integer;
userId integer ;
begin
	select count(*) into tempVar from user_roles where user_role = roleName;
	
	if tempVar = 0 then
		exec createRole(roleName, permissions);
	end if
	
	select id into tempVar from user_roles where user_role = roleName; 
	
	userId = generateId(user_data)
	
	insert into user_data values (userId,name, age, city, tempVar )
	 
    commit;
END;
$$

CREATE or REPLACE PROCEDURE createRole(roleName varchar(250), permissions varchar(250))
as $$
declare 
tempVar integer;
roleId integer ;
begin
	select count(*) into tempVar from user_permissions where  user_permissions.permission_name =  permissions;
	
	if tempVar = 0 then
		exec createPermission(permissions);
	end if
	
	select id into tempVar from user_permissions where  permissions.permission_name =  permissions; 
	
	roleId = generateId(user_roles)
	
	insert into user_roles values (roleId, roleName, tempVar )
	 
END;
$$


create or replace PROCEDURE createPermission(permissions varchar(250))
as $$
declare 
permId integer ;
begin
	
	permId = generateId(user_permissions)
	
	insert into user_permissions values (permId, permissions )

END;
$$

create or replace function generateId(table_name varchar(250))
return integer
as record_count integer := 0;
begin 
	record_count = (select count(*) from table_name) + 1;
	return record_count;
end

LANGUAGE plpgsql