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MySQL database migrations, schema comparison, stored proc management made easy

README.md

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Modyllic is an SQL parser and set of schema management tools, written in PHP 5.2, and useful for anyone working with SQL.

Modyllic is at its core, a tool for managing schema changes across branches. Because it allows you to store your schema as DDL, it means that merges between branches are easily handled using standard tools. In addition to analysis (dump and diff) tools, it also provides migration tools (migrate, apply). It also provides tools for making working with stored procedures in PHP much easier-- it comes with a tool for generating a PHP wrapper for calling your stored procedures that include type checking and fully inflated return values, eg, you can return a table and get an array containing all of the rows without a separate fetch step.

Three primary use cases are:

  • Detecting and examining differences between databases.

  • Replacing conventional linear up/down scripts with more flexible change management.

  • Providing a consistant, safe and transparent access to stored routines.

Modyllic operates on "schemas", which can represent database, table, and column definitions, routines, events, triggers, as well as data. They are stored in files as the SQL statements that would normally be used to create the tables. Schemas can be specified on the command line as:

  • A DSN that connects to a live database
  • A filename
  • A directory
  • A comma-separated list of more than one of the above (in which case all sources will be combined)

The flexibility of combining multiple sources makes it easy to deal separately with the status quo schema vs. just the changes you intend to make.

DSNs should include username and password if needed. For convenience, you can use ":" instead of ";" since shells often barf on ";" unless you are careful with your quoting. So, you could write either of the following:

mysql:host=database-server.example.org;dbname=MyDB;username=bobby;password=someThingClever
mysql:host=database-server.example.org:dbname=MyDB:username=bobby:password=someThingClever

Available tools:

All tools accept --help for usage information.

modyllic migrate -f DSN -t SCHEMA

Make the live database at DSN look like the one described by SCHEMA. You could think of it as running modyllic diff -d MySQL DSN SCHEMA and applying the diff to the live database.

modyllic diff SCHEMA1 SCHEMA2

Produce the ALTER statements etc. that would make SCHEMA1 look like SCHEMA2. This is smarter than running "diff" on two SQL dumps, because it actually parses SQL, ignores some things that should be ignored, and is sensitive to the semantic context. This essentially shows you what "migrate" would do given the same arguments.

DELIMITER ;;

ALTER TABLE person
    ADD COLUMN dob DATE AFTER name,
--  BEFORE        name VARCHAR(50) NOT NULL,
    MODIFY COLUMN name VARCHAR(200) NOT NULL
;;
DROP PROCEDURE new_person
;;
-- Arguments count differ
-- diff -u /tmp/sqlg_14782_from.txt /tmp/sqlg_14782_to.txt
-- BODY DIFFERS (9):
-- --- /tmp/sqlg_14782_from.txt 2013-12-02 10:35:06.549095299 -0500
-- +++ /tmp/sqlg_14782_to.txt   2013-12-02 10:35:06.549095299 -0500
-- @@ -1,4 +1,4 @@
--  BEGIN
-- -    INSERT INTO person SET name=p_name;
-- +    INSERT INTO person SET name=p_name, dob=p_dob;
--      SELECT LAST_INSERT_ID() as personId;
--  END
-- \ No newline at end of file
CREATE PROCEDURE new_person(
    p_name VARCHAR(200),
    p_dob DATE)
RETURNS COLUMN personId
BEGIN
    INSERT INTO person SET name=p_name, dob=p_dob;
    SELECT LAST_INSERT_ID() as personId;
END
;;

DELIMITER ;

modyllic drop SCHEMA

Produces the DROP, DELETE, etc. commands to delete SCHEMA (but doesn't actually modify anything). It's the equivalent of modyllic diff SCHEMA /dev/null.

DELIMITER ;;

DROP PROCEDURE new_person
;;
DROP TABLE person
;;

DELIMITER ;

And again with the MySQL output dialect:

SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET NAMES 'utf8';
DELIMITER ;;

DROP PROCEDURE IF EXISTS new_person
;;
DROP TABLE IF EXISTS MODYLLIC
;;
DROP TABLE IF EXISTS person
;;

DELIMITER ;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;

modyllic dump SCHEMA

Produces the CREATE, INSERT, etc. commands to create SCHEMA from scratch. This is Modyllic's replacement for mysqldump -d which gives you the output choice of several SQL dialects from the very concise to its own metadata-rich format. You could also think of it as the equivalent of modyllic diff /dev/null SCHEMA.

DELIMITER ;;

CREATE TABLE person (
    personId SERIAL PRIMARY KEY,
    name VARCHAR(50) NOT NULL
) ENGINE=InnoDB
;;
CREATE PROCEDURE new_person(
    p_name VARCHAR(200))
RETURNS COLUMN personId
BEGIN
    INSERT INTO person SET name=p_name;
    SELECT LAST_INSERT_ID() as personId;
END
;;

DELIMITER ;

And again with the MySQL output dialect:

SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET NAMES 'utf8';
DELIMITER ;;

CREATE TABLE person (
    personId BIGINT UNSIGNED NOT NULL auto_increment PRIMARY KEY,
    name VARCHAR(50) NOT NULL
) ENGINE=InnoDB
;;
-- This is used to store metadata used by the schema management tool
CREATE TABLE MODYLLIC (
    kind CHAR(9) NOT NULL,
    which CHAR(90) NOT NULL,
    value VARCHAR(20000) NOT NULL,
    PRIMARY KEY (kind,which)
) ENGINE=InnoDB
;;
TRUNCATE TABLE MODYLLIC
;;
INSERT INTO MODYLLIC SET kind='COLUMN', which='person.personId', value='{"type":"SERIAL","unique":true}'
;;
INSERT INTO MODYLLIC SET kind='INDEX', which='person.!PRIMARY KEY', value='{"column_defined":true}'
;;
INSERT INTO MODYLLIC SET kind='TABLE', which='MODYLLIC', value='{"static":true}'
;;
INSERT INTO MODYLLIC SET kind='ROUTINE', which='new_person', value='{"returns":{"type":"COLUMN","column":"personId"}}'
;;
CREATE PROCEDURE new_person(
    p_name VARCHAR(200))
BEGIN
    INSERT INTO person SET name=p_name;
    SELECT LAST_INSERT_ID() as personId;
END
;;

DELIMITER ;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;

modyllic procstophp SCHEMA

Generate a PHP helper class for the stored procs in the schema.

<?php
class Database {
    /**
     * @param $dbh
     * @param VARCHAR(200) $p_name
     * @returns personId
     */
    public static function new_person($dbh, $p_name) {
        assert('is_null($p_name) or is_scalar($p_name)');
        assert('is_null($p_name) or mb_strlen($p_name) <= 200');
        $sth = $dbh->prepare('CALL new_person(:p_name)');
        $sth->bindValue(':p_name', isset($p_name)? (string)$p_name: null, PDO::PARAM_STR);
        $sth->execute();
        try {
            $row = $sth->fetch(PDO::FETCH_ASSOC);
            $sth->closeCursor();
            if ( $row === false ) {
                return ;
            }
            assert('isset($row[\'personId\'])');
            return $row['personId'];
        }
        catch (PDOException $e) {
            if (strpos($e->getMessage(), 'SQLSTATE[HY000]: General error') !== false) {
                throw new PDOException('General error while fetching return value of new_person; this usually means that you declared this routine as having a return value but it does not actually select any data before completing.');
            }
            else {
                throw $e;
            }
        }
    }
}

cat FILENAME.sql | modyllic colorize

Useful for debugging, just pipe some SQL to it on STDIN and it will put a colorized, syntax-highlighted version on STDOUT.

Colorized Syntax Screenshot

modyllic preparse FILENAME.sql > FILENAME.sqlc - Can be used to optimize the performance of other tools by "pre-compiling" their input. The other tools will load a .sqlc file in preference to a .sql if it is newer.

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