MySQL pipe
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MySQL pipe

SQL

Blogpost

What does it do?

  • sql allows you to pipe STDIN (hopefully containing SQL) to one or more pre-configured MySQL databases
  • output comes out in \t-separated format, allowing further piping (e.g. works really well with chart)
  • when more than one database is queried, the requests are made in parallel
  • sql can either run mysql locally, run mysql locally but connecting to a remote host (by configuring a dbServer), or ssh to a remote host and from there run mysql to either a local or remote host (by configuring an appServer and a dbServer)

Installation

Get the latest binary on the Releases section, or via go get:

go get -u github.com/marianogappa/sql

Auto completion

Optionaly, you can install auto complete scripts for your shell too. It will complete the name of databases.

For bash, copy or link sql-bash-autocomplete file to /etc/bash_completion.d directory.

For zsh, copy or link sql-zsh-autocomplete file to somewhere in your $fpath. (If you use oh-my-zsh framework, copy/link it to ~/.oh-my-zsh/completions.) Note that file should be renamed to _sql. You may also need to run the following commands in order to force ZSH to rebuild its auto completion cache.

$ rm ~/.zcompdump
$ compinit

Configuration

Create a .databases.json dotfile in your home folder or in any XDG-compliant directory. This is an example file.

Example usages

cat query.sql | sql test_db

sed 's/2015/2016/g' query_for_2015.sql | sql db1 db2 db3

sql all "SELECT * FROM users WHERE name = 'John'"

Notes

  • when more than one database is queried, the resulting rows are prefixed with the database identifier
  • the all special keyword means "sql to all configured databases"
  • sql assumes that you have correctly configured SSH keys on all servers you ssh to

Beware!

  • please note that ~/.databases.json will contain your database credentials in plain text; if this is a problem for you, don't use sql!
  • sql is meant for automation of one-time lightweight ad-hoc SELECTs on many databases at once; it's not recommended for mission critical bash scripts that do destructive operations on production servers!
  • If you close an ongoing sql operation, spawned mysql and ssh->mysql processes will soon follow to their deaths, but the underlying mysql server query thread will complete, as long as it takes! https://github.com/marianogappa/sql/issues/7

Dependencies

  • mysql
  • ssh (only if you configure an "appServer")

Contribute

If you have an issue with sql, I'd love to hear about it. PRs are welcome. Ping me on Twitter if you want to have a chat about it.