MySQL存储过程相互调用

1、存储过程相互调用：

--表格
      mysql> select corderno,mshippingcharges,mgiftwrapcharges from orders;
      +----------+------------------+------------------+
      | corderno | mshippingcharges | mgiftwrapcharges |
      +----------+------------------+------------------+
      | 000001   |                6 |             1.25 |
      | 000002   |                8 |                2 |
      | 000003   |               12 |                0 |
      +----------+------------------+------------------+
      9 rows in set
       
      --
      create procedure prccharges(in orderno char(6),
             out shippingCharges float(4,2),out wrapCharges float(4,2))
             begin 
                 select mshippingcharges into shippingCharges from 
                 orders where corderno = orderno;
                 select mgiftwrapcharges into wrapcharges from orders where corderno = orderno;
             end;
             
      --执行时命令
      call prccharges('000001',@pp,@qq);
      select @pp,@qq;
    
      --执行结果
      mysql> select @pp,@qq;
      +-----+------+
      | @pp | @qq  |
      +-----+------+
      | 6   | 1.25 |
      +-----+------+
      1 row in set
    
    
      create procedure prcHandLingCharges(in orderno char(6),
         out handlingCharges float(4,2))
            begin 
              declare ppp float(4,2);
              declare qqq float(4,2);
              call prccharges(orderno,ppp,qqq);
              set handlingCharges = ppp + qqq;  
            end;
       
      
      --执行时命令
     call prcHandLingCharges('000001',@qqqq);
     select @qqqq;
    
      --执行结果
      mysql> select @qqqq;
      +-------+
      | @qqqq |
      +-------+
      | 7.25  |
      +-------+
      1 row in set

2、在存储过程中，可以使用动态执行sql的方式来返回结果集。eg：

DELIMITER $$ 
DROP procedure IF EXISTS pro_report_data $$  
CREATE procedure pro_report_data(in startT  varchar(100),in stopT  varchar(100),in buyerFilter varchar(20),gfs varchar(2000),qfs varchar(2000))  
BEGIN   
  declare colsStr varchar(2000);
  declare tableStr varchar(2000);
  declare whereStr varchar(2000);
  declare groupStr varchar(2000);
  declare sqls varchar(2000);
  
  call createReportSql4Other(null,null,0,buyerFilter,gfs,qfs,2,startT,stopT,0,colsStr,tableStr,whereStr,groupStr);
  set sqls= concat('select ',colsStr,' from ',tableStr,' where ',whereStr,' group by ',groupStr);
  set @ms=sqls; 
  PREPARE s1 from @ms; 
  EXECUTE s1; 
  deallocate prepare s1; 
END$$
DELIMITER;