Accessing MySQL from Ubuntu Bash

Question

Ubuntu bash mysql 脚本看起来像这样

mysql -h localhost -u $MYSQLLOGIN -p$MYSQLROOTPASS  -t -e ' 
CREATE USER $USERNAME@'localhost' IDENTIFIED BY $MYSQLPASS;
create database $MYSQLDB;
grant usage on *.* to $USERNAME@localhost identified by $MYSQLPASS;
grant all privileges on $MYSQLDB.* to $USERNAME@localhost';

收到错误消息

 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '$MYSQLPASS' at line 1

事实上，$MYSQLPASS是字符串内容可变的。当我测试时，它不是空的。我做错了什么？

Answer 1

在 Bash 脚本中，当字符串被 ' 包围时，变量不会替换为它们的值。请尝试改用"。

mysql -h localhost -u $MYSQLLOGIN -p$MYSQLROOTPASS  -t -e "
CREATE USER '$USERNAME'@'localhost' IDENTIFIED BY '$MYSQLPASS';
create database $MYSQLDB;
grant usage on *.* to '$USERNAME'@'localhost' identified by '$MYSQLPASS';
grant all privileges on $MYSQLDB.* to '$USERNAME'@'localhost';"

Answer 2

你需要把你的变量放在引号里以获得有效的sql，把你的字符串放在内插引号（"）中，以替换变量。