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= Introduction = We use a custom tool called {{{dbtool}}} to handle many of the aspects of creating and deleting databases for MySQL and PostgreSQL. |
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== Transferring Databases == If you have a MySQL database on another system and you wish to put that database onto our systems, you'll have to create the database on `mire` as stated above and do the following. On the system with the original database (remember to replace USER with your username and DATABASE with the name of your database): {{{ mysqldump --skip-add-drop-table -p USER_DATABASE > mydatabase.sql scp ./mydatabase.sql USER@mire.hcoop.net:~/ }}} `--skip-add-drop-table` is important since by default no tables are granted the `DROP` command. Finally, import the database using `mire`: {{{ mysql -h mysql -p USER_DATABASE < ~/mydatabase.sql }}} Now that your database has tables, you may grant `DROP` permissions to them using `mysql-fixperms` without any arguments. Now you will be able to `DROP` tables when needed. If for some reason you have a MySQL dump that includes the `DROP` command, then you may run this script on your dumpfile to remove them: {{{ sed 's/DROP TABLE/-- DROP TABLE/g' ~/mydatabase.sql > ~/mydatabase_nodrop.sql }}} (Assuming, of course, that you don't have any jerk users in your database named "[http://xkcd.com/327/ Robert'); DROP TABLE Students;--]".) Then import the dumpfile as written above. |
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== Changing Your Password == If you need to change your PostgreSQL password for security purposes or you have forgotten it, you may do so with this command: {{{ dbtool postgres passwd }}} You will be prompted to input a new password. |
This is the chapter of the MemberManual that describes how to use PostgreSQL and MySQL databases on HCoop servers.
Introduction
We use a custom tool called dbtool to handle many of the aspects of creating and deleting databases for MySQL and PostgreSQL.
MySQL
Create an Account
Creating a MySQL user account is an easy task with dbtool. It is available for use when you login to mire.hcoop.net.
Run the following command:
dbtool mysql adduser
You will be asked for a password. The user created will be the same as your log-in username.
Create a Database
dbtool is also used to create new MySQL databases. Replace DATABASE with your desired database name:
dbtool mysql createdb DATABASE
The database created will be USER_DATABASE (where USER is your username and DATABASE is the name you provided dbtool).
Delete a Database
Delete a database with the following:
dbtool mysql dropdb DATABASE
Changing Your Password
If you need to change your MySQL password for security purposes or you have forgotten it, you may do so with this command:
dbtool mysql passwd
You will be prompted to input a new password.
Accessing Databases
For web applications, set the MySQL host/server to mysql. Default ports apply. Use your HCoop username. Your password will be required. Please safeguard it. Remember that your database is really named USER_DATABASE, where DATABASE is the name you originally gave dbtool. Follow your software package's instructions.
In addition, you can easily use the mysql shell to manipulate or analyze your databases:
mysql -p -h mysql USER_DATABASE
For security reasons, you cannot drop a database using the mysql shell.
To learn more about the MySQL shell, review the [http://dev.mysql.com/doc/refman/5.0/en/ MySQL manual].
Transferring Databases
If you have a MySQL database on another system and you wish to put that database onto our systems, you'll have to create the database on mire as stated above and do the following.
On the system with the original database (remember to replace USER with your username and DATABASE with the name of your database):
mysqldump --skip-add-drop-table -p USER_DATABASE > mydatabase.sql scp ./mydatabase.sql USER@mire.hcoop.net:~/
--skip-add-drop-table is important since by default no tables are granted the DROP command.
Finally, import the database using mire:
mysql -h mysql -p USER_DATABASE < ~/mydatabase.sql
Now that your database has tables, you may grant DROP permissions to them using mysql-fixperms without any arguments. Now you will be able to DROP tables when needed. If for some reason you have a MySQL dump that includes the DROP command, then you may run this script on your dumpfile to remove them:
sed 's/DROP TABLE/-- DROP TABLE/g' ~/mydatabase.sql > ~/mydatabase_nodrop.sql
(Assuming, of course, that you don't have any jerk users in your database named "[http://xkcd.com/327/ Robert'); DROP TABLE Students;--]".)
Then import the dumpfile as written above.
PostgreSQL
Create an Account
To create a PostgreSQL user account, enter the following command on mire.hcoop.net:
dbtool postgres adduser
You will not be prompted for a password since PostgreSQL utilizes a security model that is quite different from MySQL. The user created will be the same as your log-in username.
Create a Database
Additionally, dbtool is used to create new Postgres databases. Replace DATABASE with your desired database name:
dbtool postgres createdb DATABASE
The database created will be called USER_DATABASE (where USER is your username and DATABASE is the name you provided dbtool).
Delete a Database
Delete a database with the following command:
dbtool postgres dropdb DATABASE
For security reasons, you cannot drop a database using the psql shell.
Accessing Databases
For web applications, set the PostgreSQL host/server to postgres. Default ports apply. Use your HCoop username. A password is not required. Remember that your database is really named USER_DATABASE, where DATABASE is the name you originally gave dbtool. Follow your software package's instructions.
It is very easy to access your database using a PostgreSQL shell:
psql -h postgres USER_DATABASE
To learn more about the psql shell, take a look at the [http://www.postgresql.org/docs/8.1/interactive/index.html PostgreSQL manual].