Question

以下是我的存储过程的DDL。

 DROP PROCEDURE IF EXISTS bbt_admin.getNUM;
 CREATE PROCEDURE bbt_admin.`getNUM`(IN vUei CHAR(52),
                                    IN vNum VARCHAR(52), 
                                    OUT s VARCHAR(100),
                                    OUT e VARCHAR(100))
 BEGIN    
 SELECT       
    trim(concat(ns.PREFIX,ns.Num)) AS NUM,
    ns.COUNTRY_CODE AS COUNTRY_CODE
 INTO @s,
      @e
 FROM CUSTOMER cu
    join SITE si                     ON si.PARENT_ID =   cu.ID
    join NUM_RANGES nr               ON nr.SITE_ID = si.ID
    join NUMBERS ns                  ON ns.RANGE_ID = nr.RANGE_ID
    join ADDRESSES as saddr          ON si.ID = saddr.UEI
    join PROVISION_SETTING as ps     ON ps.UEI = si.ID
 WHERE (cu.ID = vUei OR si.ID = vUei)
    AND ( ns.OWNER NOT LIKE  'sub%' OR ns.OWNER IS NULL )
    AND ns.NUMBER_CLASS in (1,5,9)
    AND trim(concat(ns.PREFIX,ns.Num))= vNum;
END;

当我执行mysql存储过程时，它成功执行但输出参数始终包含NULL值。请查找以下用于调用存储过程和选择OUT参数值的语句：

 CALL getNUM('customer:11', '012124215421', @s, @e);                    
 select @s, @e;

当我单独运行SELECT语句时，我得到OUT参数值，但是执行存储过程总是返回带有NULL值的OUT参数

  SELECT       
    trim(concat(ns.PREFIX,ns.Num)) AS NUM,
    ns.COUNTRY_CODE AS COUNTRY_CODE
  INTO @s,
       @e
  FROM CUSTOMER cu
    join SITE si                        ON si.PARENT_ID = cu.ID
    join NUM_RANGES nr                  ON nr.SITE_ID = si.ID
    join NUMBERS ns                     ON ns.RANGE_ID = nr.RANGE_ID
    join ADDRESSES as saddr             ON si.ID = saddr.UEI
    join PROVISION_SETTING as ps        ON ps.UEI = si.ID
  WHERE (cu.ID = 'customer:11' OR si.ID = 'customer:11')
   AND ( ns.OWNER NOT LIKE  'sub%' OR ns.OWNER IS NULL )
   AND ns.NUMBER_CLASS in (1,5,9)
   AND trim(concat(ns.PREFIX,ns.Num))= '012124215421';

你能帮我解决一下这个问题。提前致谢

MySql：OUT参数始终返回NULL

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