MySQL資料庫生成某一年的日曆儲存過程

delimiter $$

create procedure `t_base_calender` ( in year varchar ( 20) ) begin
declare
i int;
declare
start_date varchar ( 20);
declare
end_date varchar ( 20);
declare
date_count int;
set i = 0;
set start_date = concat( year, '-01-01');
set end_date = concat( year + 1, '-01-01');
set date_count =datediff( end_date, start_date );
while
i insert into t_base_calender ( day_time, day_week, day_type ) select
date_format( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ), '%y-%m-%d') day_time,
dayofweek( str_to_date( start_date, '%y-%m-%d %h:%i:%s') ) day_week,
//注意這裡的週幾會多1天，如應該是周五，會是週六。需特殊處理
case
dayofweek( str_to_date( start_date, '%y-%m-%d %h:%i:%s') ) 
when 6then
2when 7then
2 else 1end day_type 
from
dual;
set i = i + 1;
set start_date = date_format( date_add( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ), interval 1 day ), '%y-%m-%d');
end while;
end

改良之後：

delimiter $$

create procedure `t_base_calender` ( in year varchar ( 20) ) begin
declare
i int;
declare
start_date varchar ( 20);
declare
end_date varchar ( 20);
declare
date_count int;
set i = 0;
set start_date = concat( year, '-01-01');
set end_date = concat( year + 1, '-01-01');
set date_count =datediff( end_date, start_date );
while
i insert into t_base_calender ( day_time, day_week, day_type ) select
date_format( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ), '%y-%m-%d') day_time,
case
dayofweek( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ) ) - 1when 0then
7 else dayofweek( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ) ) - 1end day_week,
case
dayofweek( str_to_date( start_date, '%y-%m-%d %h:%i:%s') ) 
when 7then
2when 1then
2 else 1end day_type 
from
dual;
set i = i + 1;
set start_date = date_format( date_add( str_to_date( start_date, '%y-%m-%d %h:%i:%s' ), interval 1 day ), '%y-%m-%d');
end while;
end

執行儲存過程：

call t_base_calender('2021');

刪除儲存過程：

drop procedure t_base_calender;

注：mysql的儲存過程語句之前要加 delimiter $$ 否則會報 declare 定義變數報錯。

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