通过shell脚本对mysql的增删改查及my.cnf的配置

#!/bin/bash
# STRING：获取mysql默认密码的一段字符串
# 	例如：A temporary password is generated for root@localhost: xxxxxx
# PASSWORD：将获取到的STRING进行截取，获取localhost:右边的默认密码
# shellcheck disable=SC2006
STRING=`grep "temporary password" /var/log/mysqld.log`
PASSWORD=${STRING#*localhost: }

#!/bin/bash
# shellcheck disable=SC2006
PASSWORD="你的密码"

mysql -u root -pPASSWORD -e "xxxxxx"

[client]
user=root
password=xxxxxx

# 我的my.cnf文件在/etc/my.cnf下，不相同的可以自己去找找
# sed -i '第几行 添加的内容' 指定的文件
sed -i '1i [client]' /etc/my.cnf
sed -i '2i user=root' /etc/my.cnf
sed -i '3i password=xxxxxx' /etc/my.cnf

# SQL语句
DATABASE_SQL="CREATE DATABASE IF NOT EXISTS test"
# mysql -u 用户名 -e "sql语句"
# 因为在my.cnf中配置了密码，所以不用写密码了
mysql -u root -e "${DATABASE_SQL}"

# sql语句
TEST_SQL="CREATE TABLE IF NOT EXISTS test ( id varchar(20) NOT NULL, text varchar(20) NOT NULL) ENGINE=InnoDB"
# mysql -u 用户名 -D "数据库名" -e "sql语句"
mysql -u root -D "test" -e "${TEST_SQL}"

# sql语句
INSERT_SQL="insert into test values ('123', 'test')"
mysql -u root -D "test" -e "${INSERT_SQL}"

DELETE_SQL="delete from test where id='123'"
mysql -u root -D "test" -e "${DELETE_SQL}"

UPDATE_SQL="update test set text='你好' where id='123'"
mysql -u root -D "test" -e "${UPDATE_SQL}"

SELECT_SQL="select id, text from test where id='123'"
mysql -u root -D "test" -e "${SELECT_SQL}"

# mysql5.7之前
SQL="update mysql set password=password("新密码") where user='root'"
# mysql5.7及以后
SQL="update mysql set authentication_string=password("新密码") where user='root'"

# flush privileges：刷新
mysql -u root -D "mysql" -e "${SQL};flush privileges"