genddl

Generate RDB DDL by go struct

THIS IS A ALPHA QUALITY RELEASE. API MAY CHANGE WITHOUT NOTICE.

Install

$ go install github.com/mackee/go-genddl/cmd/genddl@latest

Example

Look example sources.

Usage

1. Write schema struct.

//go:generate genddl -outpath=./mysql.sql -driver=mysql

//+table: person
type Person struct { //=> CREATE TABLE `person` (
	ID uint64 `db:"id,primarykey,autoincrement"` //=> `id`            BIGINT unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT,
	Name string `db:"name,unique"`               //=> `name`          VARCHAR(191) NOT NULL UNIQUE,
	Age uint32 `db:"age,null"`                   //=> `age`           INTEGER unsigned NULL,
	UserCode string `db:"usercode"`              //=> `usercode`      VARCHAR(191) NOT NULL,
	Type uint32 `db:"type"`                      //=> `type`          INTEGER unsigned NOT NULL,
	TeamID uint64 `db:"team_id"`                 //=> `team_id`       BIGINT unsigned NOT NULL,
	CreatedAt time.Time `db:"created_at"`        //=> `created_at`    DATETIME NOT NULL
}

Default NOT NULL. You can add tag null if you want nullable column.

2. Run go generate

$ ls
person.go
$ go generate
$ person.go mysq.sql

Other Features

Indexes

If you want to set indexes, write method for schema struct. It name must be _schemaIndex.

Example:

import (
	"github.com/mackee/go-genddl/index"
)

//+table:team
type Team struct { ... }

//+table:person
type Person struct { ... }

func (s Person) _schemaIndex(methods index.Methods) []index.Definition {
	return []index.Definition{
		methods.PrimaryKey(s.ID, s.CreatedAt),  //=> PRIMARY KEY (`id`, `created_at`),
		methods.Unique(s.UserCode, s.Type),     //=> UNIQUE (`usercode`, `type`),
		methods.ForeignKey(s.TeanID, Team{}.ID, index.ForeignKeyDeleteCascade, index.ForeignKeyUpdateSetDefault),
		    //=> FOREGIN KEY (`team_id`) REFERENCES team(`id`) ON DELETE CASCADE ON UPDATE SET DEFAULT
		methods.Complex(s.Age, s.Name),         //=> CREATE INDEX person_age_name (`age`, `name`);
	}
}