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README.md
mysql-patcher
A package/program to help patch MySql databases.
Synopsis
This is the simplest program that can work:
var path = require('path')
var mysql = require('mysql')
var patcher = require('mysql-patcher')
var options = {
user : 'user',
database : 'db',
password : 'password',
dir : path.join(__dirname, 'schema'),
patchKey : 'schema-patch-level',
patchLevel : 4,
filePrefix : 'patch',
metaTable : 'metadata',
mysql : mysql,
}
patcher.patch(options, function(err, res) {
console.log('err:', err)
console.log('res:', res)
})
Note: you should require mysql yourself and pass this to .patch()
so that we're using the version you
want, instead of us depending on mysql ourselves.
.patch(options)
The options are passed straight through to MySql, so you can provide any of the following:
Discussed below are some of more regular ones, but if not provided they will take the defaults specified on the mysql page (above):
- user : the user for the database (requires permission to create the database if needed)
- password : the password for the database
- host : the host for the database
- port : the port for the database
- socketPath : the socket (instead of host and port)
- database : the database name
Specific options for mysql-patcher
:
- dir : string - the directory where the patch files live
- patchLevel : integer - the level to which the database should patched
- metaTable : string - the metaTable name
- patchKey : string - the name of the row in the metaTable which stores the current patch
- createDatabase : true/false - tries to create the database if it doesn't exist (default: false)
- reversePatchAllowed : true/false - allow reverse patching to take place (default: false)
- filePrefix : string - the patchfile prefix to look for e.g. patch-001-002.sql (default: 'patch')
Database Patch Files
All patch files should be named in the following format:
<name>-<from>-<to>.sql
- e.g. patch-0001-0002.sql
This example is a patch file from level 1 to level 2.
Each database patch file should perform any queries they want first, then the last statement should
set your patchKey
value (in the metaTable
) to the patch specified
Your Initial Patch
Your initial patch shouldn't do much except create the metaTable
and set the patchKey
row to be 1.
If you don't know what to do, copy and paste these two files for your initial forward and reverse patches:
e.g. Forward patch file : patch-00-01.sql
CREATE TABLE metadata (
name VARCHAR(255) NOT NULL PRIMARY KEY,
value VARCHAR(255) NOT NULL
) ENGINE=InnoDB;
INSERT INTO metadata SET name = 'schema-patch-level', value = '1';
e.g. Reverse patch file : patch-01-00.sql
DROP TABLE metadata;
Patches 2 and above
Once your initial patch has worked, each subsequent patch (both forward and reverse) should not try to insert the patch level, but instead update it:
e.g. Forward patch file : patch-01-02.sql
UPDATE metadata SET value = '2' WHERE name = 'schema-patch-level';
e.g. Reverse patch file : patch-02-01.sql
UPDATE metadata SET value = '1' WHERE name = 'schema-patch-level';
Changelog
Pending
- none
v0.7.0 - 2015-03-16
- added option 'filePrefix' to tighten which files are classed as patch files
- fixed a test related to access for an unknown user
v0.6.1 - 2015-02-02
- fixed up a test related to patch application
v0.6.0 - 2015-02-02
- added ability to create an instance of Patcher which can be controlled more succinctly
v0.5.1 - 2015-01-21
- fix patch direction error message
v0.5.0 - 2015-01-19
- fix error handling when the connection fails
v0.4.0 - 2014-11-14
- added a check between patches to make sure the patch level was incremented properly
License
(Ends)