Mysql间隔取数据，实现sqlserver的row_number（）函数

Posted 2020-09-14

1. 使用临时表

CREATE DEFINER=`root`@`%` PROCEDURE `sp_getMonitorInfo`(IN d_itemId INT, IN d_configId INT, d_count_num INT )

begin

set @count = 0;

set @num = 0;

SELECT @count :=count(1) FROM better.MonitorInfo where itemId=d_itemId and configId=d_configId;

IF @count<300

THEN

   SELECT id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId FROM MonitorInfo where itemId=itemId and configId=configId;

ELSE

SET @num= round(@count/d_count_num,0);

select @num;

create temporary table tmp_MonitorInfo

(

tmp_id int(4) primary key not null auto_increment,

id  int(4) not null,

cpu int,

cpu1 int,

cpu2 int,

cpu3 int,

diskRead int,

diskWrite int,

memory int,

networkReceive int,

networkSend int,

time  varchar(40),

configId int,

itemId int

);

insert into tmp_MonitorInfo(id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId)

select id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId from MonitorInfo 

where itemId=d_itemId and configId=d_configId;

select  id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId from tmp_MonitorInfo

where tmp_id%@num=0;

drop table tmp_MonitorInfo;

END IF;

end

2. 使用临时变量

CREATE DEFINER=`root`@`%` PROCEDURE `sp_getMonitorInfo_2`(IN d_itemId INT, IN d_configId INT, d_count_num INT )

begin

set @count = 0;

set @num = 0;

SELECT @count :=count(1) FROM better.MonitorInfo where itemId=d_itemId and configId=d_configId;

IF @count<300

THEN

   SELECT id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId FROM MonitorInfo where itemId=itemId and configId=configId;

ELSE

SET @num= round(@count/d_count_num,0);

select @num;

set @i = 0;

select * from (

select @i :[email protected] + 1 as tmp_id,id,cpu,cpu1,cpu2,cpu3,diskRead,diskWrite,memory,networkReceive,networkSend,time,configId,itemId from MonitorInfo 

where itemId=d_itemId and configId=d_configId) aa

where aa.tmp_id%@num=0;

END IF;

end

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