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SQLize

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Generate Migration from golang struct and existing sql, support:

• MySQL
• Postgres
• Sqlite
• Sql Server

Features

• Sql parser
• Sql builder from objects
• Generate sql migration from diff between existed sql and objects
• Generate arvo schema (Mysql only)
• Support embedded struct
• Generate migration version - compatible with golang-migrate/migrate
• Tag options - compatible with gorm tag

WARNING: some functions doesn't work on PostgreSQL, let me know of any issues

Getting Started

package main

import (
	"time"
	
	"github.com/sunary/sqlize"
)

type user struct {
	ID          int32  `sql:"primary_key;auto_increment"`
	Alias       string `sql:"type:VARCHAR(64)"`
	Name        string `sql:"type:VARCHAR(64);unique;index_columns:name,age"`
	Age         int
	Bio         string
	IgnoreMe    string     `sql:"-"`
	AcceptTncAt *time.Time `sql:"index:idx_accept_tnc_at"`
	CreatedAt   time.Time  `sql:"default:CURRENT_TIMESTAMP"`
	UpdatedAt   time.Time  `sql:"default:CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;index:idx_updated_at"`
}

func (user) TableName() string {
	return "user"
}

var createStm = `
CREATE TABLE user (
  id            INT AUTO_INCREMENT PRIMARY KEY,
  name          VARCHAR(64),
  age           INT,
  bio           TEXT,
  gender        BOOL,
  accept_tnc_at DATETIME NULL,
  created_at    DATETIME DEFAULT CURRENT_TIMESTAMP,
  updated_at    DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);
CREATE UNIQUE INDEX idx_name_age ON user(name, age);
CREATE INDEX idx_updated_at ON user(updated_at);`

func main() {
	n := time.Now()
	newMigration := sqlize.NewSqlize(sqlize.WithSqlTag("sql"), sqlize.WithMigrationFolder(""))
	_ = newMigration.FromObjects(user{AcceptTncAt: &n})

	println(newMigration.StringUp())
	//CREATE TABLE `user` (
	//	`id`            int(11) AUTO_INCREMENT PRIMARY KEY,
	//	`alias`         varchar(64),
	//	`name`          varchar(64),
	//	`age`           int(11),
	//	`bio`           text,
	//	`accept_tnc_at` datetime NULL,
	//	`created_at`    datetime DEFAULT CURRENT_TIMESTAMP(),
	//	`updated_at`    datetime DEFAULT CURRENT_TIMESTAMP() ON UPDATE CURRENT_TIMESTAMP()
	//);
	//CREATE UNIQUE INDEX `idx_name_age` ON `user`(`name`, `age`);
	//CREATE INDEX `idx_accept_tnc_at` ON `user`(`accept_tnc_at`);
	//CREATE INDEX `idx_updated_at` ON `user`(`updated_at`);

	println(newMigration.StringDown())
	//DROP TABLE IF EXISTS `user`;

	oldMigration := sqlize.NewSqlize(sqlize.WithMigrationFolder(""))
	//_ = oldMigration.FromMigrationFolder()
	_ = oldMigration.FromString(createStm)

	newMigration.Diff(*oldMigration)

	println(newMigration.StringUp())
	//ALTER TABLE `user` ADD COLUMN `alias` varchar(64) AFTER `id`;
	//ALTER TABLE `user` DROP COLUMN `gender`;
	//CREATE INDEX `idx_accept_tnc_at` ON `user`(`accept_tnc_at`);

	println(newMigration.StringDown())
	//ALTER TABLE `user` DROP COLUMN `alias`;
	//ALTER TABLE `user` ADD COLUMN `gender` tinyint(1) AFTER `age`;
	//DROP INDEX `idx_accept_tnc_at` ON `user`;

	println(newMigration.ArvoSchema())
	//...

	_ = newMigration.WriteFiles("demo migration")
}

Convention

• mysql by default, using option sql_builder.WithPostgresql() for postgresql
• Sql syntax uppercase (Eg: "SELECT * FROM user WHERE id = ?") default, using option sql_builder.WithSqlLowercase() for lowercase
• Support generate comment, using option sql_builder.WithCommentGenerate()
• Support automatic addition of s to table names (plural naming convention), using option sql_builder.WithPluralTableName()
• Accept tag convention: snake_case or camelCase, Eg: sql:"primary_key" equalize sql:"primaryKey"
• Primary key for this field: sql:"primary_key"
• Foreign key: sql:"foreign_key:user_id;references:user_id"
• Auto increment: sql:"auto_increment"
• Indexing this field: sql:"index"
• Custom index name: sql:"index:idx_col_name"
• Unique indexing this field: sql:"unique"
• Custome unique index name: sql:"unique:idx_name"
• Composite index (include unique index and primary key): sql:"index_columns:col1,col2"
• Index type: sql:"index_type:btree"
• Set default value: sql:"default:CURRENT_TIMESTAMP"
• Override datatype: sql:"type:VARCHAR(64)"
• Ignore: sql:"-"
• Pointer value must be declare in struct

type sample struct {
	ID        int32 `sql:"primary_key"`
	DeletedAt *time.Time
}

now := time.Now()
newMigration.FromObjects(sample{DeletedAt: &now})

• mysql data type will be changed implicitly:

TINYINT => tinyint(4)
INT     => int(11)
BIGINT  => bigint(20)

• fields belong to embedded struct have the lowest order, except primary key always first
• an embedded struct (sql:"embedded" or sql:"squash") can not be pointer, also support prefix: sql:"embedded_prefix:base_"

type Base struct {
	ID        int32 `sql:"primary_key"`
	CreatedAt time.Time
}
type sample struct {
	Base `sql:"embedded"`
	User string
}

newMigration.FromObjects(sample{})

/*
CREATE TABLE sample (
 id         int(11) PRIMARY KEY,
 user       text,
 created_at datetime
);
*/