mysql 查询10分钟以内的数据:
select *from t_agent where int_last_login>=CURRENT_TIMESTAMP - INTERVAL 10 MINUTE;
mysql关联多表进行update更新操作
am_favorites_4表 |
|||
af_user_id |
af_tag_id |
af_content_id |
af_content_type |
374 |
0 |
535522 |
3 |
374 |
0 |
535522 |
3 |
374 |
89 |
535522 |
3 |
am_tag_user_4表 |
||
atu_user_id |
atu_tag_id |
atu_num |
374 |
0 |
9 |
374 |
89 |
9 |
am_tag_user_4 表 |
||
atu_user_id |
atu_tag_id |
atu_num |
374 |
0 |
7 |
374 |
89 |
8 |
UPDATE am_tag_user_4 tag
INNER JOIN am_favorites_4 fav
ON tag.atu_tag_id=fav.af_tag_id and tag.atu_user_id=fav.af_user_id
INNER JOIN (SELECT af_user_id,af_tag_id,count(*) as cnt
FROM am_favorites_4,am_tag_user_4
where atu_tag_id=af_tag_id and atu_user_id=af_user_id and af_content_id = 535522 andaf_content_type=3 and af_user_id=374
group by af_user_id,af_tag_id) AS T1
ON tag.atu_tag_id=T1.af_tag_id and tag.atu_user_id=T1.af_user_id
SET tag.atu_num=tag.atu_num- T1.cnt
http://blog.sina.com.cn/s/blog_4c197d420101aer2.html
在shell开发中,很多时候我们需要操作mysql数据库(比如:查询数据、导出数据等),但是我们又无法进入mysql命令行的环境,就需要在shell环境中模拟mysql的环境,使用mysql相关命令,本文总结几种shell操作mysql的方法,供大家参考。
方案1
- mysql -uuser -ppasswd -e"insert LogTable values(...)"
方案2
- CREATE TABLE `user` (
- `id` varchar(36) NOT NULL COMMENT '主键',
- `username` varchar(50) NOT NULL COMMENT '用户名',
- `password` varchar(50) NOT NULL COMMENT '用户密码',
- `createdate` date NOT NULL COMMENT '创建时间',
- `age` int(11) NOT NULL COMMENT '年龄',
- PRIMARY KEY (`id`)
- ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='用户信息表';
- DROP TABLE IF EXISTS `visit_log`;
- CREATE TABLE `visit_log` (
- `id` varchar(36) character set utf8 NOT NULL,
- `type` int(11) NOT NULL,
- `content` text character set utf8 NOT NULL,
- `createdate` date NOT NULL,
- PRIMARY KEY (`id`)
- ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='访问日志';
- use chbdb;
- source update.sql
- cat update_mysql.sh | mysql --user=root -ppassword
方案3
- #!/bin/bash
- mysql -u* -h* -p* <<EOF
- Your SQL script.
- EOF
#!/bin/bash mysql -uroot -ppassword <<EOF use chbdb; CREATE TABLE user ( id varchar(36) NOT NULL COMMENT '主键', username varchar(50) NOT NULL COMMENT '用户名', password varchar(50) NOT NULL COMMENT '用户密码', createdate date NOT NULL COMMENT '创建时间', age int(11) NOT NULL COMMENT '年龄', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='用户信息表'; EOF
方案4
- mysql -uroot -ppassword < update.sql
http://www.cnblogs.com/wangkangluo1/archive/2012/04/27/2472898.html
对于自动化运维,诸如备份恢复之类的,DBA经常需要将SQL语句封装到shell脚本。本文描述了在Linux环境下mysql数据库中,shell脚本下调用sql语句的几种方法,供大家参考。对于脚本输出的结果美化,需要进一步完善和调整。以下为具体的示例及其方法。
1、将SQL语句直接嵌入到shell脚本文件中
--演示环境
[root@SZDB ~]# more /etc/issue
CentOS release 5.9 (Final)
Kernel on an m
root@localhost[(none)]> show variables like 'version';
+---------------+------------+
| Variable_name | Value |
+---------------+------------+
| version | 5.6.12-log |
+---------------+------------+
[root@SZDB ~]# more shell_call_sql1.sh
#!/bin/bash
# Define log
TIMESTAMP=`date +%Y%m%d%H%M%S`
LOG=call_sql_${TIMESTAMP}.log
echo "Start execute sql statement at `date`." >>${LOG}
# execute sql stat
mysql -uroot -p123456 -e "
tee /tmp/temp.log
drop database if exists tempdb;
create database tempdb;
use tempdb
create table if not exists tb_tmp(id smallint,val varchar(20));
insert into tb_tmp values (1,'jack'),(2,'robin'),(3,'mark');
select * from tb_tmp;
notee
quit"
echo -e " ">>${LOG}
echo "below is output result.">>${LOG}
cat /tmp/temp.log>>${LOG}
echo "script executed successful.">>${LOG}
exit;
[root@SZDB ~]# ./shell_call_sql1.sh
Logging to file '/tmp/temp.log'
+------+-------+
| id | val |
+------+-------+
| 1 | jack |
| 2 | robin |
| 3 | mark |
+------+-------+
Outfile disabled.
2、命令行调用单独的SQL文件
[root@SZDB ~]# more temp.sql
tee /tmp/temp.log
drop database if exists tempdb;
create database tempdb;
use tempdb
create table if not exists tb_tmp(id smallint,val varchar(20));
insert into tb_tmp values (1,'jack'),(2,'robin'),(3,'mark');
select * from tb_tmp;
notee
[root@SZDB ~]# mysql -uroot -p123456 -e "source /root/temp.sql"
Logging to file '/tmp/temp.log'
+------+-------+
| id | val |
+------+-------+
| 1 | jack |
| 2 | robin |
| 3 | mark |
+------+-------+
Outfile disabled.
3、使用管道符调用SQL文件
[root@SZDB ~]# mysql -uroot -p123456 </root/temp.sql
Logging to file '/tmp/temp.log'
id val
1 jack
2 robin
3 mark
Outfile disabled.
#使用管道符调用SQL文件以及输出日志
[root@SZDB ~]# mysql -uroot -p123456 </root/temp.sql >/tmp/temp.log
[root@SZDB ~]# more /tmp/temp.log
Logging to file '/tmp/temp.log'
id val
1 jack
2 robin
3 mark
Outfile disabled.
4、shell脚本中MySQL提示符下调用SQL
[root@SZDB ~]# more shell_call_sql2.sh
#!/bin/bash
mysql -uroot -p123456 <<EOF
source /root/temp.sql;
select current_date();
delete from tempdb.tb_tmp where id=3;
select * from tempdb.tb_tmp where id=2;
EOF
exit;
[root@SZDB ~]# ./shell_call_sql2.sh
Logging to file '/tmp/temp.log'
id val
1 jack
2 robin
3 mark
Outfile disabled.
current_date()
2014-10-14
id val
2 robin
5、shell脚本中变量输入与输出
[root@SZDB ~]# more shell_call_sql3.sh
#!/bin/bash
cmd="select count(*) from tempdb.tb_tmp"
cnt=$(mysql -uroot -p123456 -s -e "${cmd}")
echo "Current count is : ${cnt}"
exit
[root@SZDB ~]# ./shell_call_sql3.sh
Warning: Using a password on the command line interface can be insecure.
Current count is : 3
[root@SZDB ~]# echo "select count(*) from tempdb.tb_tmp"|mysql -uroot -p123456 -s
3
[root@SZDB ~]# more shell_call_sql4.sh
#!/bin/bash
id=1
cmd="select count(*) from tempdb.tb_tmp where id=${id}"
cnt=$(mysql -uroot -p123456 -s -e "${cmd}")
echo "Current count is : ${cnt}"
exit
[root@SZDB ~]# ./shell_call_sql4.sh
Current count is : 1
#以上脚本演示中,作抛砖引玉只用,对于输出的结果不是很规整友好,需要进一步改善和提高。