在mysql上使用儲存過程給相應的表加入字段

程式公升級需要給mysql的資料庫加上特定欄位以供公升級需要

create

procedure thams.adds() 
begin
#定義變數
declare _tablename varchar(32);
declare _done int default 0; 
#將查詢的結果賦予變數cur 
declare _cur cursor for 
select table_name from information_schema.`columns`
where table_schema='thams'
and table_name like
'%_document'
group
by table_name ;
declare continue handler
forsqlstate
'02000'
set _done=1;#錯誤定義，標記迴圈結束
#開啟游標cur 
open _cur;
#有條件控制的迴圈語句。當滿足特定條件until時，就會跳出迴圈語句
repeat
#使用游標
fetch _cur into _tablename;
if not _done then
begin
ifnot
exists (select * from information_schema.columns where table_schema = 'thams'
and table_name = _tablename and column_name = 'expireyear') then
set @stmt := concat("alter table ",_tablename," add column expireyear varchar(30);");
prepare stmt from @stmt;
execute stmt;
#alter
table _tablename add
column project_id varchar(32);
endif;
end;
endif;
until _done end repeat;
#關閉游標
close _cur;
set _done = 0;#只有定義為0，新的迴圈才能繼續。
end;
call thams.adds();

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