mysql 的sql语句
1 procdure 存储过程 用游标循环BEGIN
DECLARE devsn varchar(100) default null;
DECLARE serialNo varchar(40) default null;
DECLARE fcloor int(11) DEFAULT NULL ;
DECLARE nextIntime dateTime default null;
Declare modelName varchar(200) default null;
Declare maintainName varchar(200) default null;
Declare propertyName varchar(200) default null;
DECLARE flg boolean default true;
DECLARE name varchar(200) default null;
// 获取结果集游标
DECLARE cur CURSOR FOR
select * from ems.sheet3 where ems.sheet3.设备注册代码 not in (select ems.tbl_user_dev.user_dev_sn
from ems.tbl_user_dev );
// 当不能发现时设置为false
DECLARE CONTINUE HANDLER FOR NOT FOUND SET flg = false;
open cur; while(flg) do
FETCH cur into devsn,name,serialNo,nextIntime,fcloor,propertyName,maintainName;
if(flg) then
insert into tbl_user_dev (tbl_user_dev.user_dev_sn,
tbl_user_dev.factory_no,
tbl_user_dev.user_dev_model_id,
tbl_user_dev.maintenance_organization_id,
tbl_user_dev.using_organization_id)
select devsn,serialNo,
(select tbl_user_dev_model.id from tbl_user_dev_model where tbl_user_dev_model.model_name=name),
(select tbl_org.id from tbl_org where tbl_org.org_name=maintainName and tbl_org.org_type='01'),
(select tbl_org.id from tbl_org where tbl_org.org_name=propertyName and tbl_org.org_type='02');
insert into tbl_elevator (
tbl_elevator.user_dev_id,
tbl_elevator.nextin_spection_date,
tbl_elevator.floor )
select (select tbl_user_dev.id from tbl_user_dev where tbl_user_dev.user_dev_sn=devsn),
nextIntime,
fcloor;
end if;
end WHILE;
close cur;
end
// 注意：当插入的值要去继续查找时要用select 而不是 values() 而且将select的结果用扩好括起来
另外一个例子：
BEGIN
DECLARE aSnVARCHAR(45) default null;
DECLARE aFloorVARCHAR(45) default null;
DECLARE aStationVARCHAR(45) default null;
DECLARE aDoor VARCHAR(45) default null;
DECLARE doneBoolean default true;
declare cur cursor for select
tbl_elevator_input.电梯注册代码,
substring_index(tbl_elevator_input.层数/站数/门数 ,'/',1) as floor ,
substring_index(substring_index(tbl_elevator_input.层数/站数/门数 ,'/',2),'/',-1) as station ,
substring_index(tbl_elevator_input.层数/站数/门数 ,'/',-1) as door
FROM tbl_elevator_input
where
length(tbl_elevator_input.层数/站数/门数)-length(replace(tbl_elevator_input.层数/站数/门数,'/','')) = 2
union all
select
tbl_elevator_input.电梯注册代码,
substring_index(tbl_elevator_input.层数/站数/门数 ,'/',1),
substring_index(substring_index(tbl_elevator_input.层数/站数/门数 ,'/',2),'/',-1),
''
FROM tbl_elevator_input
where
length(tbl_elevator_input.层数/站数/门数)-length(replace(tbl_elevator_input.层数/站数/门数,'/','')) = 1
union all
select tbl_elevator_input.电梯注册代码,substring_index(tbl_elevator_input.层数/站数/门数 ,'/',1),'',''
FROM tbl_elevator_input
where
length(tbl_elevator_input.层数/站数/门数)-length(replace(tbl_elevator_input.层数/站数/门数,'/','')) = 0;
declare continue handler for not found set done=FALSE;
open cur;
while done DO
fetch cur into aSn,aFloor,aStation,aDoor;
if(done) then
update tbl_elevator
set tbl_elevator.floor=aFloor,
tbl_elevator.stand=aStation,
tbl_elevator.door=aDoor
where tbl_elevator.user_dev_id in
(select * from tbl_user_dev
where tbl_user_dev.user_dev_sn=aSn);
end if;
end while;
close cur;
END
3,如何给某个字段的值一次加1，并用固定的长度显示不足的用0代替
sql 语句：
set @r=0;// 定义局部变量 update tbl_district set code =lpad(@r:=@r+1,6,'0') // 左侧补0，定长为6位
页:
[1]