将SQL查询转换为存储过程

Question

How can I convert this to a stored procedure?

select 
employee_name,
SUM(IF(cdr_call_type_code = 'CEL', cdr_charge_amount, 0)) as cell,
SUM(IF(cdr_call_type_code = 'NDD', cdr_charge_amount, 0)) as ndd,
SUM(IF(cdr_call_type_code = 'IDD', cdr_charge_amount, 0)) as idd,
SUM(cdr_charge_amount) as total
from cdr_employees

I am not familiar with storedprocs.

Answer 1

You need to figure out why you need a stored proc here, and where your inputted/outputted data goes. But Here's the framework for a stored-proc, in MySQL :

     drop procedure if exists simpleproc;

     DELIMITER //
      CREATE PROCEDURE simpleproc ()
      BEGIN

      select 
      employee_name,
      SUM(IF(cdr_call_type_code = 'CEL', cdr_charge_amount, 0)) as cell,
      SUM(IF(cdr_call_type_code = 'NDD', cdr_charge_amount, 0)) as ndd,
      SUM(IF(cdr_call_type_code = 'IDD', cdr_charge_amount, 0)) as idd,
      SUM(cdr_charge_amount) as total
      from cdr_employees;

      END//
     DELIMITER;

Test it

call simpleproc();

Please see this example for a good reference - https://stackoverflow.com/a/10650323/763029

Stored procedure video source

Answer 2

If Sql Server you can use the CASE keyword.

select 
employee_name,
CASE WHEN cdr_call_type_code = 'CEL' THEN SUM(cdr_call_type_code) ELSE 0 AS cell,
...from cdr_employees

Answer 3

I think this syntax works..

DELIMITER $$

DROP PROCEDURE IF EXISTS `lcs_rdb`.`sp_CostCenterReport`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_CostCenterReport`()
BEGIN
        SET @sql = CONCAT("
            select 
            employee_name,
            SUM(IF(cdr_call_type_code = 'CEL', cdr_charge_amount, 0)) as cell,
            SUM(IF(cdr_call_type_code = 'NDD', cdr_charge_amount, 0)) as ndd,
            SUM(IF(cdr_call_type_code = 'IDD', cdr_charge_amount, 0)) as idd,
            SUM(cdr_charge_amount) as total
            from cdr_employees
            ");
  PREPARE stmt FROM @sql;
   EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
    END$$

DELIMITER ;