How to feed mysql queries from bash

Question

I'm trying to make a bash script that creates a mysql user and database but I can't find a way to feed the sql into mysql, I'm trying with this format:

mysql < echo "query"

But that is not working, see the example below:

mysql --host=localhost --user=user --password=password < echo "CREATE USER 'testuser'@'localhost' IDENTIFIED BY  'jakdJxct8W';
CREATE DATABASE IF NOT EXISTS 'testuser_dev' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin;
GRANT ALL PRIVILEGES ON  'testuser_dev' . * TO  'testuser'@'localhost';
CREATE DATABASE IF NOT EXISTS 'testuser_qa' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin;
GRANT ALL PRIVILEGES ON  'testuser_qa' . * TO  'testuser'@'localhost';"

How to feed mysql with the queries?

Answer 1

Try like this:

echo "select 1" | mysql

Answer 2

mysql --batch --silent -e 'SHOW TABLES';

Batch and silent are handy if you are planning to pipe the output

Answer 3

Try using a here document like this:

mysql --host=localhost --user=user --password=password << END

CREATE USER 'testuser'@'localhost' IDENTIFIED BY  'jakdJxct8W';
CREATE DATABASE IF NOT EXISTS 'testuser_dev' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin;
GRANT ALL PRIVILEGES ON  'testuser_dev' . * TO  'testuser'@'localhost';
CREATE DATABASE IF NOT EXISTS 'testuser_qa' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin;
GRANT ALL PRIVILEGES ON  'testuser_qa' . * TO  'testuser'@'localhost';

END

Alternatively place all you commands in text file and run it:

mysql --host=localhost --user=user --password=password < commands.sql

Answer 4

The reason your attempt did not work was because the < expects a file name and you fed it a string. You would have to do something like

echo "YOURQUERYSTRINGHERE">tmpfile
mysql --host=localhost --user=user --password=password dbname <tmpfile

ken's suggestion of

 mysql  --host=localhost --user=user --password=password -e "QUERY" dbname

can work, but if you try to use bash variables in your query you can fall foul of parameter expansion. eg

QUERY="select * from $MYTABLE WHERE name=\"silly@place.com\";"
mysql --host=localhost --user=user --password=password -e "$QUERY" mydbname

may not do what you expect. One option is use

echo "$QUERY"|mysql --host=localhost --user=user --password=password mydbname

which works if the query string contains appropriate quoting. Another option is the "here" document as suggested by dogbane.

Answer 5

Have you tried mysql -e query?

Answer 6

For big queries in a bash script, you can try:

read -d '' SQL_QUERY_1 << EOF

SELECT prod.id as id, prod.title as title, comp.name as company, pho.id as photo_id, pho.image as photo_name
FROM products as prod
JOIN accounts as comp
ON comp.id = prod.account_id
JOIN photos as pho
ON pho.id = prod.featured_photo_id;

EOF

echo ${SQL_QUERY_1} | mysql