mysql個人總結

數據庫腳本的導入導出語句

1導入：

source e:\test.sql

2導出：

C:\Windows\system32>mysqldump -hlocalhost -u root -p test>e:\test.sql

Enter password: ***

Ok!

在控制檯（cmd）輸入上面的話即可。

3存儲過程：

兩個成功運行的實例

DROP PROCEDURE IF EXISTS t1;

delimiter //

create procedure t1()

BEGIN

DECLARE i INT DEFAULT 0;

while i<=100 do

insert into t1 values(now(),i,0.35);

set i = i + 1;

end while;

end//

DROP PROCEDURE IF EXISTS t2;

delimiter //

create procedure t2()

BEGIN

DECLARE i INT DEFAULT 0;

while i<=4500 do

insert into t2 values(now(),0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,

       0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,0.35,i);

set i = i + 1;

end while;

end//

 

運行存儲過程：call t1();

注：在執行存儲過程的時候，有可能報 ERROR 1370 (42000): execute command denied to user 'fondy'@'%' for routine 'mms.t2'錯誤，原因是沒有賦給你執行存儲過程的權限，然後讓管理員附加權限即可，語句爲：grant execute on procedure mms.t2 to 'fly'@'%';

查看存儲過程源碼：show create procedure t2;

4觸發器：

 create table animals(
 id int(4) primary key not null,
 name varchar(8),
 number int(4));


 create table animals1(
   ID   BIGINT(12)  NOT NULL  AUTO_INCREMENT primary key,
 name varchar(8),
 time date );


create table animals2(
id  int(4) primary key not null,
content varchar(20),
time datetime)


create trigger tri_alf
after insert on animals
for each row 
   begin 
    insert into animals1 (name,time) values ('增加數據',now());
   end; $


delimiter $
create trigger tri_alf1
after insert on animals
for each row 
   begin 


    insert into animals1  values (NEW.id*NEW.id,'增加數據',now());
   end; $

成功的案例：

drop database if exists jie;

create database jie;

use jie;

DROP TABLE IF EXISTS `tb_ana_run_room`;

/*!40101 SET @saved_cs_client     = @@character_set_client */;

/*!40101 SET character_set_client = utf8 */;

CREATE TABLE `tb_ana_run_room` (

  `fd_id` varchar(36) NOT NULL,

  `datetime` datetime DEFAULT NULL,

  `chi_room_id` varchar(10) DEFAULT NULL,

  `cap_demand` double DEFAULT NULL,

  `cap_config` double DEFAULT NULL,

  `power_consum` double DEFAULT NULL,

  `cap_diff` double DEFAULT NULL,

  PRIMARY KEY (`fd_id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

 

CREATE TABLE `tb_group_run_chp` (

  `fd_id` varchar(36) NOT NULL,

  `datetime` datetime NOT NULL,

  `dev_group_id` varchar(10) NOT NULL,

  `chp_flow` double NOT NULL,

  `chp_sw_temp` double NOT NULL,

  `chp_rw_temp` double NOT NULL,

  `chp_sw_head` double NOT NULL,

  `chp_rw_head` double NOT NULL,

  `passby_status` double NOT NULL,

  `chi_room_id` varchar(10) NOT NULL,

  PRIMARY KEY (`fd_id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

 

delimiter $

create trigger tri_alf_1

after insert on tb_group_run_chp for

each row

BEGIN

DECLARE i INT DEFAULT 0;

while i<=100 do

         insert into tb_ana_run_room (fd_id,datetime,chi_room_id,cap_demand) values(concat(NEW.fd_id,i),NEW.DATETIME,NEW.chi_room_id,NEW.chp_rw_temp*NEW.chp_flow-NEW.chp_sw_temp*NEW.chp_flow);

set i = i + 1;

end while;

end $

 

delimiter ;

INSERT INTO `tb_group_run_chp` VALUES ('1','2013-01-18 11:30:00','A020100000',265.41,7,11.8,241.52,62.52,0,'A020000000');

5中文亂碼：

向數據庫插入內容的時候，不能插入中文，在插入之前，進行如下操作：

set names gbk;

然後就ok了!;

6字符串與數字之間的轉換：

 select id,cast(score as unsigned int) as scorefrom tt order by score desc;

如果id是字符串，那麼mysql排序的時候就按照字母序號排，如果想要按數字的大小排序，則需要將字符串轉換爲數字，轉換函數爲cast。

Limit 2,5 從2取起，總數爲5條。

Eg:

Select * from tb_dev_run_dcp order by cast(fd_id as unsigned int) limit 0,1;

7字符串轉換成時間類型：date_format();

listAlarmAll1 = getAlarmServiceImp(request).findList("alarmGrade=1 and date_format(alarmTime,'%Y-%m-%d %h:%i:%s') between date_format('"+time1+"','%Y-%m-%d %h:%i:%s') and date_format('"+time2+"','%Y-%m-%d %h:%i:%s')", "alarmTime");