The easiest idempotent MySQL/PostgreSQL/SQLite3 schema management by SQL.
This is inspired by Ridgepole but using SQL, so there's no need to remember Ruby DSL.
Download the single-binary executable for your favorite database from:
https://github.com/k0kubun/sqldef/releases
mysqldef should work in the same way as mysql for setting connection information.
$ mysqldef --help
Usage:
mysqldef [options] db_name
Application Options:
-u, --user=user_name MySQL user name (default: root)
-p, --password=password MySQL user password, overridden by $MYSQL_PWD
-h, --host=host_name Host to connect to the MySQL server (default: 127.0.0.1)
-P, --port=port_num Port used for the connection (default: 3306)
-S, --socket=socket The socket file to use for connection
--password-prompt Force MySQL user password prompt
--file=sql_file Read schema SQL from the file, rather than stdin (default: -)
--dry-run Don't run DDLs but just show them
--export Just dump the current schema to stdout
--skip-drop Skip destructive changes such as DROP
--help Show this help
# Make sure that MySQL server can be connected by mysql(1)
$ mysql -uroot test -e "select 1;"
+---+
| 1 |
+---+
| 1 |
+---+
# Dump current schema by adding `def` suffix and --export
$ mysqldef -uroot test --export
CREATE TABLE `user` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(191) DEFAULT 'k0kubun',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
# Save it to edit
$ mysqldef -uroot test --export > schema.sqlUpdate the schema.sql like (instead of ADD INDEX, you can just add KEY index_name (name) in the CREATE TABLE as well):
CREATE TABLE user (
id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(128) DEFAULT 'k0kubun',
+ created_at DATETIME NOT NULL
) Engine=InnoDB DEFAULT CHARSET=utf8mb4;
+
+ALTER TABLE user ADD INDEX index_name(name);And then run:
# Check the auto-generated migration plan without execution
$ mysqldef -uroot test --dry-run < schema.sql
--- dry run ---
Run: 'ALTER TABLE user ADD COLUMN created_at datetime NOT NULL ;'
Run: 'ALTER TABLE user ADD INDEX index_name(name);'
# Run the above DDLs
$ mysqldef -uroot test < schema.sql
Run: 'ALTER TABLE user ADD COLUMN created_at datetime NOT NULL ;'
Run: 'ALTER TABLE user ADD INDEX index_name(name);'
# Operation is idempotent, safe for running it multiple times
$ mysqldef -uroot test < schema.sql
Nothing is modified
# Run without droping existing tables and columns
$ mysqldef -uroot test --skip-drop < schema.sql
Skipped: 'DROP TABLE users;'psqldef should work in the same way as psql for setting connection information.
$ psqldef --help
Usage:
psqldef [option...] db_name
Application Options:
-U, --user=username PostgreSQL user name (default: postgres)
-W, --password=password PostgreSQL user password, overridden by $PGPASS
-h, --host=hostname Host or socket directory to connect to the PostgreSQL server (default: 127.0.0.1)
-p, --port=port Port used for the connection (default: 5432)
--password-prompt Force PostgreSQL user password prompt
-f, --file=filename Read schema SQL from the file, rather than stdin (default: -)
--dry-run Don't run DDLs but just show them
--export Just dump the current schema to stdout
--skip-drop Skip destructive changes such as DROP
--help Show this help
You can use PGSSLMODE environment variable to specify sslmode.
# Make sure that PostgreSQL server can be connected by psql(1)
$ psql -U postgres test -c "select 1;"
?column?
----------
1
(1 row)
# Dump current schema by adding `def` suffix and --export
$ psqldef -U postgres test --export
CREATE TABLE public.users (
id bigint NOT NULL,
name text,
age integer
);
CREATE TABLE public.bigdata (
data bigint
);
# Save it to edit
$ psqldef -U postgres test --export > schema.sqlUpdate the schema.sql like:
CREATE TABLE users (
id bigint NOT NULL PRIMARY KEY,
- name text,
age int
);
-CREATE TABLE bigdata (
- data bigint
-);And then run:
# Check the auto-generated migration plan without execution
$ psqldef -U postgres test --dry-run < schema.sql
--- dry run ---
Run: 'DROP TABLE bigdata;'
Run: 'ALTER TABLE users DROP COLUMN name;'
# Run the above DDLs
$ psqldef -U postgres test < schema.sql
Run: 'DROP TABLE bigdata;'
Run: 'ALTER TABLE users DROP COLUMN name;'
# Operation is idempotent, safe for running it multiple times
$ psqldef -U postgres test < schema.sql
Nothing is modified
# Run without droping existing tables and columns
$ psqldef -U postgres test --skip-drop < schema.sql
Skipped: 'DROP TABLE users;'$ sqlite3def --help
Usage:
sqlite3def [option...] db_name
Application Options:
-f, --file=filename Read schema SQL from the file, rather than stdin (default: -)
--dry-run Don't run DDLs but just show them
--export Just dump the current schema to stdout
--skip-drop Skip destructive changes such as DROP
--help Show this help
Following DDLs can be generated by updating CREATE TABLE.
Some of them can also be used for input schema file.
- MySQL
- Table: CREATE TABLE, DROP TABLE
- Column: ADD COLUMN, CHANGE COLUMN, DROP COLUMN
- Index: ADD INDEX, ADD UNIQUE INDEX, CREATE INDEX, CREATE UNIQUE INDEX, DROP INDEX
- Primary key: ADD PRIMARY KEY, DROP PRIMARY KEY
- Foreign Key: ADD FOREIGN KEY, DROP FOREIGN KEY
- View: CREATE VIEW, CREATE OR REPLACE VIEW, DROP VIEW
- PostgreSQL
- Table: CREATE TABLE, DROP TABLE
- Column: ADD COLUMN, ALTER COLUMN, DROP COLUMN
- Index: CREATE INDEX, CREATE UNIQUE INDEX, DROP INDEX
- Foreign / Primary Key: ADD FOREIGN KEY, DROP CONSTRAINT
- Policy: CREATE POLICY, DROP POLICY
- View: CREATE VIEW, CREATE OR REPLACE VIEW, DROP VIEW
- SQLite3
- Table: CREATE TABLE, DROP TABLE
- View: CREATE VIEW, DROP VIEW
+CREATE TABLE users (
+ name VARCHAR(40) DEFAULT NULL
+);Remove the statement to DROP TABLE.
CREATE TABLE users (
name VARCHAR(40) DEFAULT NULL,
+ created_at DATETIME NOT NULL
);Remove the line to DROP COLUMN.
CREATE TABLE users (
- name VARCHAR(40) DEFAULT NULL,
+ name CHAR(40) DEFAULT NULL,
created_at DATETIME NOT NULL
); CREATE TABLE users (
name CHAR(40) DEFAULT NULL,
created_at DATETIME NOT NULL,
+ UNIQUE KEY index_name(name)
);or
CREATE TABLE users (
name CHAR(40) DEFAULT NULL,
created_at DATETIME NOT NULL
);
+
+ALTER TABLE users ADD UNIQUE INDEX index_name(name);Remove the line to DROP INDEX.
CREATE TABLE users (
+ id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
name CHAR(40) DEFAULT NULL,
created_at datetime NOT NULL,
UNIQUE KEY index_name(name)
);Remove the line to DROP PRIMARY KEY.
Composite primary key may not work for now.
CREATE TABLE users (
id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
name CHAR(40) DEFAULT NULL,
created_at datetime NOT NULL,
UNIQUE KEY index_name(name)
);
CREATE TABLE posts (
user_id BIGINT UNSIGNED NOT NULL,
+ CONSTRAINT posts_ibfk_1 FOREIGN KEY (user_id) REFERENCES users (id)
);Remove the line to DROP FOREIGN KEY.
Composite foreign key may not work for now.
CREATE VIEW foo AS
select u.id as id, p.id as post_id
from (
mysqldef_test.users as u
join mysqldef_test.posts as p on ((u.id = p.user_id))
)
;
+ CREATE OR REPLACE VIEW foo AS select u.id as id, p.id as post_id from (mysqldef_test.users as u join mysqldef_test.posts as p on (((u.id = p.user_id) and (p.is_deleted = 0))));Remove the line to DROP VIEW.
+CREATE TABLE users (
+ id BIGINT PRIMARY KEY
+);Remove the statement to DROP TABLE.
CREATE TABLE users (
id BIGINT PRIMARY KEY,
+ name VARCHAR(40)
);Remove the line to DROP COLUMN.
CREATE TABLE users (
id BIGINT PRIMARY KEY,
name VARCHAR(40)
);
+CREATE INDEX index_name on users (name);Remove the line to DROP INDEX.
CREATE TABLE users (
id BIGINT PRIMARY KEY,
name VARCHAR(40)
);
CREATE INDEX index_name on users (name);
CREATE TABLE posts (
user_id BIGINT,
+ CONSTRAINT fk_posts_user_id FOREIGN KEY (user_id) REFERENCES users (id)
)Remove the line to DROP CONSTRAINT.
CREATE TABLE users (
id BIGINT PRIMARY KEY,
name VARCHAR(40)
);
CREATE POLICY p_users ON users AS PERMISSIVE FOR ALL TO PUBLIC USING (id = (current_user)::integer) WITH CHECK ((name)::text = current_user)
+CREATE POLICY p_users ON users AS PERMISSIVE FOR ALL TO PUBLIC USING (id = (current_user)::integer) WITH CHECK ((name)::text = current_user)Remove the line to DROP POLICY.
CREATE VIEW foo AS
select u.id as id, p.id as post_id
from (
mysqldef_test.users as u
join mysqldef_test.posts as p on ((u.id = p.user_id))
)
;
+ CREATE OR REPLACE VIEW foo AS select u.id as id, p.id as post_id from (users as u join posts as p on (((u.id = p.user_id) and (p.is_deleted = 0))));Remove the line to DROP VIEW.
A debian package might be supported in the future, but for now it has not been implemented yet.
# mysqldef
wget -O - https://github.com/k0kubun/sqldef/releases/latest/download/mysqldef_linux_amd64.tar.gz \
| tar xvz
# psqldef
wget -O - https://github.com/k0kubun/sqldef/releases/latest/download/psqldef_linux_amd64.tar.gz \
| tar xvzHomebrew tap is available.
# mysqldef
brew install sqldef/sqldef/mysqldef
# psqldef
brew install sqldef/sqldef/psqldef
Because sqldef distinguishes table/index/column by its name, sqldef does NOT support:
- RENAME TABLE
- RENAME INDEX
- DROP + ADD could be fine for index, though
- CHANGE COLUMN for rename
To rename them, you would need to rename manually and use --export again.
You can use the following command to prepare MySQL and PostgreSQL to be used for running tests.
$ sudo apt install mysql-client postgresql-client
$ docker-compose up
$ make test-mysqldef MYSQL_HOST=127.0.0.1
$ make test-psqldef PGHOST=127.0.0.1 PGSSLMODE=disable
Unless otherwise noted, the sqldef source files are distributed under the MIT License found in the LICENSE file.
sqlparser is distributed under the Apache Version 2.0 license found in the sqlparser/LICENSE.md file.