在mysql中插入用户定义变量创建用户

Question

我希望创建一个shell脚本，以便在docker中运行，并创建一个MySQL用户，其主机IP作为命令行变量传递。所以我的脚本是./create_user.sh 172.17.0.1

我试着从只在sql语句部分插入变量开始，并使用如下所示：

#!/bin/sh
docker exec -i atb-mariadb bash <<'EOF' 
mysql -uroot -pmypass
set @ip='172.17.0.1';
CREATE USER 'exporter'@@ip IDENTIFIED BY 'mypass';
GRANT PROCESS, REPLICATION CLIENT ON *.* TO 'exporter'@'172.17.0.1';
GRANT SELECT ON performance_schema.* TO 'exporter'@'172.17.0.1';
SELECT user, host FROM mysql.user;
exit
EOF

这会导致语法错误，还有一些我尝试过的语法错误：

CREATE USER CONCAT_WS('exporter','@',@ip) IDENTIFIED BY 'mypass';
CREATE USER 'exporter'@CONCAT_WS('',@ip) IDENTIFIED BY 'mypass';

当然，这只是脚本的sql语句部分中的变量。在整个shell脚本中使用一个变量并将其传递到sql是一个问题，我甚至还无法解决这个问题。

提前感谢您的帮助！

更新

我尝试了Raymond的解决方案，它适用于sql变量部分。但是，试图通过命令行传递变量值对于以下脚本仍然失败：

#!/bin/sh
echo script received $1
docker exec -e ipa=$1 -i atb-mariadb bash <<'EOF'
echo exec received $ipa
mysql -uroot -pmypass -e "
SET @ip='${ipa}';
SET @createUser = 'CONCAT("CREATE USER exporter@",@ip,"IDENTIFIED BY'mypass'")';
PREPARE smtpCreateUser FROM @createUser;
EXECUTE smtpCreateUser;";
exit
EOF

与输出

$ ./create_user.sh 172.18.0.5
script received 172.18.0.5
exec received 172.18.0.5
mysql  Ver 15.1 Distrib 10.2.9-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Usage: mysql [OPTIONS] [database]

Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf
The following groups are read: mysql client client-server client-mariadb
The following options may be given as the first argument:
--print-defaults        Print the program argument list and exit.
......and so on

我理解通常的方法是使用.sql句柄运行一个单独的-e脚本文件，但不幸的是，绑定这个文件到默认的mariadb容器或创建自定义映像都是不可能的。

Answer 1

您应该能够生成带有CONCAT的动态SQL语句，准备并执行它们。

查询

SET @ip = '172.17.0.1';

SET @createUser = CONCAT(
            "CREATE USER exporter@",@ip, " IDENTIFIED BY 'mypass'" 
          );

PREPARE smtpCreateUser FROM @createUser;
EXECUTE smtpCreateUser;

Answer 2

您需要从shell获取变量，然后才能在查询中使用它。我认为您正在寻找类似的东西(请确保删除EOF中的引号)：

#!/bin/sh
docker exec -i atb-mariadb bash <<EOF
ip="${1:-127.0.0.1}"
echo mysql -uroot -pmypass
echo CREATE USER 'exporter'@'${ip}' IDENTIFIED BY 'mypass';
GRANT PROCESS, REPLICATION CLIENT ON *.* TO 'exporter'@'172.17.0.1';
GRANT SELECT ON performance_schema.* TO 'exporter'@'172.17.0.1';
SELECT user, host FROM mysql.user;
exit
EOF