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 r 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 "n">>${LOG}
echo "below is output result.">>${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。