將PostgreSQL存儲過程遷移到MYSQL

Question

我有以下PostgreSQL，我想重新編寫它使它與MySQL存儲函數兼容。

CREATE OR REPLACE FUNCTION test.yearly_demand_function(IN paramstartdate date, 
                 OUT network character varying, 
                 OUT season_number integer, 
                 OUT week_trans numeric, 
                 OUT month_trans numeric, 
                 OUT year_trans numeric) 
    RETURNS SETOF record AS 
$BODY$ 

BEGIN 
    RETURN QUERY 
     (select qq.network::varchar, 
     qq.season_number, 
     qq.week_trans::numeric, 
     qq.month_trans::numeric, 
     qq.year_trans::numeric 
     from 
      ( 
      SELECT coalesce(nullif(mpf.studio,''),fi.name) AS network, 
      coalesce(mpf.season_number, mpf.reported_season_number) AS season_number , 
      sum(case when activity_date >= date_trunc('week', paramStartDate::timestamp) - interval '7 day' and activity_date <= paramStartDate then mpf.units_sold else 0 END) as week_trans, 
      sum(case when activity_date >= date_trunc('month', paramStartDate::timestamp) and activity_date <= paramStartDate then mpf.units_sold else 0 END) as month_trans, 
      sum(case when activity_date >= date_trunc('year', paramStartDate::timestamp) and activity_date <= paramStartDate then mpf.units_sold else 0 END) as year_trans 
      FROM customer.dim_product_view mpf 
      left join customer.feed_indicator fi on mpf.series_name = fi.indicator_value 
      and mpf.series_name = fi.indicator_value 
      left join 
      (
      select p.series_name,p.season_number,count(*) as episode_count 
      from product p 
      where source in ('Amway','FifthThird') 
      and p.episode_number is not null 
      group by 1,2) as pec on mpf.series_name = pec.series_name 
      and mpf.season_number = pec.season_number 
      WHERE mpf.activity_date BETWEEN date_trunc('year', paramStartDate::timestamp) AND paramStartDate 
      AND 1=1 
      AND (mpf.demographic is null or '' not in ('') or ('' in ('') and mpf.demographic = 'Persons')) 
      AND mpf.customer_product_id not ilike '%unallocated%' 
      GROUP BY 1,2,3,7,34,35,36 
      )qq 
     ); 

end; 
$BODY$ 
    LANGUAGE plpgsql VOLATILE 
    COST 100 
    ROWS 1000; 
ALTER FUNCTION yearly_demand_function(date); 

現在林不知道如何從上面的PostgreSQL（RETURN QUERY part）寫RETURNS SETOF record AS對於MySQL

雖然我已經開始寫存儲過程對我的SQL如下

-- DROP FUNCTION IF EXISTS looptest; 
DELIMITER $$ 

CREATE FUNCTION test.yearly_demand_function( IN paramstartdate date, 
               OUT network varchar(256), 
               OUT season_number integer, 
               OUT week_value numeric, 
               OUT month_value numeric, 
               OUT year_value numeric 
     ) RETURNS <What to Write > 
      LANGUAGE SQL 
BEGIN 

    RETURN QUERY 
     (select qq.network::varchar, 
     qq.season_number, 
     qq.week_value::numeric, 
     qq.month_value::numeric, 
     qq.year_value::numeric 
     from 
      ( 
      SELECT coalesce(nullif(mm.studio,''),fi.name) AS network, 
      coalesce(mm.season_number, mm.reported_season_number) AS season_number , 
      sum(case when final_date >= date_trunc('week', paramStartDate::timestamp) - interval '7 day' and final_date <= paramStartDate then mm.units_sold else 0 END) as week_value, 
      sum(case when final_date >= date_trunc('month', paramStartDate::timestamp) and final_date <= paramStartDate then mm.units_sold else 0 END) as month_value, 
      sum(case when final_date >= date_trunc('year', paramStartDate::timestamp) and final_date <= paramStartDate then mm.units_sold else 0 END) as year_value 
      FROM customer.product_view mm 
      left join customer.f_indicator fi on mm.series_name = fi.indicator_value 
      and mm.series_name = fi.indicator_value 
      left join 
      (
      select p.name,p.s_number,count(*) as episode_count 
      from product p 
      where source in ('Amway','FifthThird') 
      and p.e_number is not null 
      group by 1,2) as tt on mm.series_name = tt.series_name 
      and mm.season_number = tt.season_number 
      WHERE mm.final_date BETWEEN date_trunc('year', paramStartDate::timestamp) AND paramStartDate 
      AND 1=1 
      AND (mm.demographic is null or '' not in ('') or ('' in ('') and mm.demographic = 'Persons')) 
      AND mm.customer_product_id not ilike '%unallocated%' 
      GROUP BY 1,2,3,7,34,35,36 
      )qq 
     ); 


END; 
$$ 
DELIMITER 

如何寫上面的PostgreSQL的RETURNS SETOF record AS（返回查詢部分）MYSQL

Answer 1

而不是CREATE FUNCTION使用CREATE PROCEDURE語法。然後您可以在該塊內寫入正常的SELECT聲明。要執行您創建的存儲過程，請使用CALL語法（即CALL test.yearly_demand_function('2013-01-01')）。你也不需要指定你的參數。參數的值將與您在SELECT語句中指定的5列相對應。