sqldef

README

sqldef

The easiest idempotent MySQL/PostgreSQL/SQLite3/SQL Server schema management by SQL.

This is inspired by Ridgepole but using SQL, so there's no need to remember Ruby DSL.

Installation

Download the single-binary executable for your favorite database from:

https://github.com/k0kubun/sqldef/releases

Usage

mysqldef

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
      --enable-cleartext-plugin     Enable/disable the clear text authentication plugin
      --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
      --enable-drop-table           Enable destructive changes such as DROP (enable only table drops)
      --skip-view                   Skip managing views (temporary feature, to be removed later)
      --before-apply=               Execute the given string before applying the regular DDLs
      --config=                     YAML file to specify: target_tables
      --help                        Show this help
      --version                     Show this version

Example

# 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.sql

Update 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 < schema.sql
Skipped: 'DROP TABLE users;'

# Run droping existing tables and columns
$ mysqldef -uroot test --enable-drop-table < schema.sql
Run: 'DROP TABLE users;'

# Run using file with skip tables
# Tables in 'skip-tables' are ignored (can use Regexp)
$ echo "user\n.*_bk\n.*_[0-9]{8}" > skip-tables
$ mysqldef -uroot test --skip-file skip-tables < schema.sql

psqldef

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 $PGPASSWORD
  -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
      --enable-drop-table    Enable destructive changes such as DROP (enable only table drops)
      --skip-view            Skip managing views/materialized views
      --skip-extension       Skip managing extensions
      --before-apply=        Execute the given string before applying the regular DDLs
      --config=              YAML file to specify: target_tables
      --help                 Show this help
      --version              Show this version

You can use PGSSLMODE environment variable to specify sslmode.

Example

# 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.sql

Update 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 < schema.sql
Skipped: 'DROP TABLE users;'

# Run droping existing tables and columns
$ psqldef -U postgres test --enable-drop-table < schema.sql
Run: 'DROP TABLE users;'

sqlite3def

$ 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
      --enable-drop-table Enable destructive changes such as DROP (enable only table drops)
      --config=           YAML file to specify: target_tables
      --help              Show this help
      --version

mssqldef

Usage:
  mssqldef [options] db_name

Application Options:
  -U, --user=user_name       MSSQL user name (default: sa)
  -P, --password=password    MSSQL user password, overridden by $MSSQL_PWD
  -h, --host=host_name       Host to connect to the MSSQL server (default: 127.0.0.1)
  -p, --port=port_num        Port used for the connection (default: 1433)
      --password-prompt      Force MSSQL 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
      --enable-drop-table    Enable destructive changes such as DROP (enable only table drops)
      --help                 Show this help
      --version              Show this version

Supported features

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, CREATE VIRTUAL TABLE
  • Column: ADD COLUMN, DROP COLUMN
  • Index: CREATE INDEX, DROP INDEX
  • View: CREATE VIEW, DROP VIEW
• SQL Server
  • Table: CREATE TABLE, DROP TABLE
  • Column: ADD COLUMN, DROP COLUMN, DROP CONSTRAINT
  • Index: ADD INDEX, DROP INDEX
  • Primary key: ADD PRIMARY KEY, DROP PRIMARY KEY
  • VIEW: CREATE VIEW, DROP VIEW

MySQL examples

CREATE TABLE

+CREATE TABLE users (
+  name VARCHAR(40) DEFAULT NULL
+);

Remove the statement to DROP TABLE.

ADD COLUMN

 CREATE TABLE users (
   name VARCHAR(40) DEFAULT NULL,
+  created_at DATETIME NOT NULL
 );

Remove the line to DROP COLUMN.

CHANGE COLUMN

 CREATE TABLE users (
-  name VARCHAR(40) DEFAULT NULL,
+  name CHAR(40) DEFAULT NULL,
   created_at DATETIME NOT NULL
 );

ADD INDEX

 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.

ADD PRIMARY KEY

 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.

ADD FOREIGN KEY

 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 (OR REPLACE) VIEW

 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.

PostgreSQL examples

CREATE TABLE

+CREATE TABLE users (
+  id BIGINT PRIMARY KEY
+);

Remove the statement to DROP TABLE.

ADD COLUMN

 CREATE TABLE users (
   id BIGINT PRIMARY KEY,
+  name VARCHAR(40)
 );

Remove the line to DROP COLUMN.

CREATE INDEX

 CREATE TABLE users (
   id BIGINT PRIMARY KEY,
   name VARCHAR(40)
 );
+CREATE INDEX index_name on users (name);

Remove the line to DROP INDEX.

ADD FOREIGN KEY

 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.

ADD POLICY

 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 (OR REPLACE) VIEW

 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.

Distributions

Linux

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 xvz

macOS

Homebrew tap is available.

# mysqldef
brew install sqldef/sqldef/mysqldef

# psqldef
brew install sqldef/sqldef/psqldef

Limitations

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.

Development

If you update parser/parser.y, run:

$ go install golang.org/x/tools/cmd/goyacc
$ make -C parser

You can use the following command to prepare command line tools and DB servers for running tests.

# Linux
$ sudo apt install mysql-client postgresql-client sqlite3
$ curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
$ curl https://packages.microsoft.com/config/ubuntu/20.04/prod.list | sudo tee /etc/apt/sources.list.d/msprod.list
$ sudo apt-get update && sudo apt-get install mssql-tools # then add: export PATH="$PATH:/opt/mssql-tools/bin"

# macOS
$ brew install libpq && brew link --force libpq
$ brew install microsoft/mssql-release/mssql-tools

# Start database
$ docker-compose up

# Run all tests
$ make test

# Run *def tests
$ go test ./cmd/*def

# Run a single test
$ go test ./cmd/mysqldef -run=TestApply/CreateTable

Contributing

If you have multiple issues or pull requests to be filed, it'd be greatly appreciated if you can prepare all of the contents beforehand and file all issues or pull requests at once.

That way, I'd like to predict the amount of effort required to make it possible for you to start using sqldef. If you incrementally contribute to the project every day, it would make my time management for OSS development hard and ultimately slow down the sqldef development.

License

Unless otherwise noted, the sqldef source files are distributed under the MIT License found in the LICENSE file.

parser is distributed under the Apache Version 2.0 license found in the parser/LICENSE.md file.

Documentation

Index

• func ParseFiles(files []string) []string
• func ParseSkipTables(skipFile string) []string
• func ReadFile(filepath string) (string, error)
• func ReadFiles(filepaths []string) (string, error)
• func Run(generatorMode schema.GeneratorMode, db database.Database, ...)
• type Options

Functions

func ParseFiles

func ParseFiles(files []string) []string

func ParseSkipTables

func ParseSkipTables(skipFile string) []string

func ReadFile

func ReadFile(filepath string) (string, error)

func ReadFiles

func ReadFiles(filepaths []string) (string, error)

func Run

func Run(generatorMode schema.GeneratorMode, db database.Database, sqlParser database.Parser, options *Options)

Main function shared by all commands

Types

type Options

type Options struct {
	DesiredDDLs     string
	CurrentFile     string
	DryRun          bool
	Export          bool
	EnableDropTable bool
	BeforeApply     string
	Config          database.GeneratorConfig
}