创建存储过程以根据输入参数（id，arrayOfNo []）从员工（第一个表）和订单（第二个表）中删除记录

Question

我有两个表，employees（company_id，employee_num）和orders（employee_num，order_description）。

如果用户发送程序参数company_id，employe_num（1，[911,912]），那么如果employees表有更多员工编号为id 1，那么我们应该删除其他员工编号行，如果它有[911,912,913]员工编号为1那么它应该删除从913行作为emp_num并删除命令中的所有记录（表2），其中emp_num是913

离（程序）：

    CREATE OR REPLACE FUNCTION deleteEmployeeOrders(P_company_id bigint, orders_array  arrayType[] ) RETURNS INT AS $$
 DECLARE
         orders_array  arrayType;
 DECLARE
         order  arrayType;
 DECLARE
         status_code integer;
 BEGIN
   status_code:= -1;

   FOR line IN (SELECT * FROM employees where company_id = p_company_id)
         LOOP
             if exists(select * from  employees where emp_num = order.emp_num not in orders_array)
THEN
                delete from employees where employee_num = order.employee_num;
                DELETE FROM orders WHERE employee_num = order.employee_num;
         END LOOP;
   status_code = 1;
   return status_code;
 END;
 $$ LANGUAGE plpgsql;

例如

 :select deleteEmployeeOrders(1,[911,912])

它应该在行table1中将913删除为emp no，并删除table2中emp_num 913的所有行

Answer 1

在您的示例中，听起来您想要删除给定company_id的所有员工（和相关订单）记录。那是对的吗？如果是这样，您可以使用两个简单的DELETE：

-- Delete all orders related to employees for given "company_id"
DELETE FROM orders 
WHERE employee_num IN (
  SELECT employee_num 
  FROM employees 
  WHERE company_id = p_company_id
);

-- Delete employees for given "company_id"
DELETE FROM employees
WHERE company_id = p_company_id;

它们应该在同一个事务中完成，因此它们要么全部工作要么全部失败。您还应首先执行“订单”DELETE，以便您可以引用employees表中的员工。

如果这不是您所需要的，那么请更准确地解释您正在寻找的内容。如果您只指定员工（911,912），我不会完全按照您的示例中的逻辑删除员工913。

更新

修改DELETE语句以针对arrayOfNo数组中不存在的employee_num值运行：

-- Delete all orders related to employees for given "company_id"
DELETE FROM orders 
WHERE employee_num IN (
  SELECT employee_num 
  FROM employees 
  WHERE company_id = p_company_id
  AND employee_num <> ALL(arrayOfNo) -- Get employees NOT IN arrayOfNo list
);

-- Delete employees for given "company_id"
DELETE FROM employees
WHERE company_id = p_company_id
AND employee_num <> ALL(arrayOfNo) -- Get employees NOT IN arrayOfNo list
;

同样，这两个语句应该作为单个事务运行。如果有效，请告诉我。