50 7 儲存過程 PROCEDURE

儲存過程沒有返回資料，需使用call proc()呼叫

create definer=`neo`@`%` procedure `angelfund`(in `puid` varchar(50), in `ptime` datetime)

language sql
not deterministic
contains sql
sql security definer
comment ''
begin
declare fusername varchar(16) default null;
declare fname varchar(16) default null;
declare fmembers_date varchar(20) default null;
select username,name,from_unixtime(createtime) into fusername,fname,fmembers_date from members where username = puid;
if fusername is not null then
insert ignore into angelfund(username,name,members_date,accounts_date,endtime,`status`,op,operator,`description`) value(fusername,fname,fmembers_date,ptime,date_add(ptime, interval +1 month),'n','n','computer','');
end if;
end

call angelfund('100','2013-10-10 10:10:10');

在過程中執行sql，下面的例子是檔案匯出的例子。

drop procedure if exists `export_file`;

delimiter $$
create definer=`dba`@`%` procedure `export_file`(in file_name char(64), in tabname char(64))
begin
set @sql = concat('select * into outfile ',"'/var/lib/mysql-files/",file_name,"'",' from ', tabname) ; 
-- select @sql;
prepare stmt from @sql; 
execute stmt; 
deallocate prepare stmt;
end$$
delimiter ;

call test.export_file('test', 'mytable');

mysql> prepare stmt1 from 'select sqrt(pow(?,2) + pow(?,2)) as hypotenuse';

query ok, 0 rows affected (0.00 sec)
statement prepared
mysql> set @a = 3;
query ok, 0 rows affected (0.00 sec)
mysql> set @b = 4;
query ok, 0 rows affected (0.00 sec)
mysql> execute stmt1 using @a, @b;
+------------+
| hypotenuse |
+------------+
| 5 |
+------------+
1 row in set (0.00 sec)
mysql> deallocate prepare stmt1;
query ok, 0 rows affected (0.00 sec)
mysql>

use `test`;

drop procedure if exists `test`;
delimiter $$
use `test`$$
create definer=`dba`@`%` procedure `test`(in a int, in b int ,out num int)
begin
set num = a + b;
end$$
delimiter ;

set @num = 0;

call test(3,7,@num);
select @num;

use `netkiller`;

drop procedure if exists `table2json`;
delimiter $$
use `netkiller`$$
create definer=`neo`@`%` procedure `table2json`(
in `schema` varchar(32), 
in `table` varchar(32), 
in `id` varchar(10), 
out rev varchar(1024)
)begin
set @column = null;
set @str = null;
select 
group_concat(fields) as col into @column from (
select 
concat('"', column_name, '",', column_name) as fields
from
information_schema.columns
where
table_name = `table`
and table_schema = `schema`) as tmptable;
-- select @column;
set @sql = concat('select json_object(',@column, ' ) as json into @str from ', `table`,' where id = ', `id`);
-- select @sql;
prepare stmt from @sql; 
execute stmt; 
deallocate prepare stmt;
set rev = @str;
end$$
delimiter ;

set @rev = '0';

call netkiller.table2json('test', 'test', '1', @rev);
select @rev;

use `netkiller`;

drop procedure if exists `trigger2json`;
delimiter $$
use `netkiller`$$
create definer=`root`@`localhost` procedure `trigger2json`(
in `schema` varchar(32), 
in `table` varchar(32), 
out rev varchar(1024)
)begin
set @column = null;
set @str = null;
select 
group_concat(fields) as col
into @column from
(select 
concat('"', column_name, '", new.', column_name) as fields
from
information_schema.columns
where
table_name = `table`
and table_schema = `schema`) as tmptable;
-- select @column;
set @sql = concat('select json_object(',@column, ' ) as json into @str ');
-- select @sql; 
prepare stmt from @sql; 
execute stmt; 
deallocate prepare stmt;
set rev = @str;
end$$
delimiter ;

set @rev = '0';

call neo.trigger2json('gw', 'member', @rev);
select @rev;

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