mysql存储过程

此存储过程实例,主要注意 在存储过程中 if 语句的使用,已经如果存在则不添加 not exists的使用,

insert into table_name(column1) select column1 from table_name2

where colunm2=’condition1’

and not exists (select 1 from table_name2 where table_name2.column1=table_name.column1)

DELIMITER $$

CREATE PROCEDURE `sp_create_empty_account`(
p_cellphone varchar(20),
p_channel_code varchar(50),
out p_return varchar(100)
)
BEGIN
declare v_user_id ,v_account_id,v_channel_id,v_channel_account_id bigint ;
declare v_is_main_channel bit;

DECLARE exit HANDLER FOR SQLEXCEPTION
begin
ROLLBACK;
set p_return='fail';
end;

set p_return="";

select c_channel_id,c_is_default into v_channel_id,v_is_main_channel from t_channel
where c_code=p_channel_code
and c_type=0 and c_status=1;

if (v_channel_id>0 && exists (select 1 from t_user where c_cellphone =p_cellphone))
then

select c_user_id into v_user_id
from t_user where c_cellphone=p_cellphone;

** set autocommit=0; **

start transaction;

INSERT INTO  t_account(`c_user_id`) select v_user_id
from dual
where not exists (select 1 from t_account where c_user_id=v_user_id);

select c_account_id into v_account_id from t_account where c_user_id=v_user_id;

if (v_account_id>0 && not exists (select 1 from t_channel_account
where c_account_id=v_account_id and c_channel_id=v_channel_id))
then

insert into t_channel_account (c_account_id,c_channel_id,c_is_active)
values(v_account_id,v_channel_id,v_is_main_channel);

if v_is_main_channel=b'1'
then
select c_channel_account_id into v_channel_account_id
from t_channel_account
where c_account_id=v_account_id and c_is_active=b'1';

update t_account set c_channel_account_id=v_channel_account_id
where c_account_id=v_account_id;

end if;

end if;

commit;

set p_return="success";
else
set p_return="not found user or channel";
end if;
END