從Ubuntu Bash訪問MySQL

Question

Ubuntu bash mysql腳本看起來就像那樣

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';

獲取錯誤消息

 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

事實上，$ MYSQLPASS是字符串內容的變量。 當我測試時，它並不是空的。 我究竟做錯了什么？

Answer 1

在Bash腳本中，當string被'括起來時，變量不會被它們的值替換。 嘗試使用"代替。

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

您需要將變量放在引號中以獲取有效的sql，並使用插值引號（ " ）將字符串替換為變量。