# GORM Yet Another ORM library for Go, aims for developer friendly ## Overview * CURD * Chainable API * Before/After Create/Save/Update/Delete Callbacks * Order/Select/Limit/Offset Support * Automatically CreatedAt, UpdatedAt * Create table from struct * Prevent SQL Injection * Goroutines friendly * Database Pool ## Basic Usage ```go db, _ = Open("postgres", "user=gorm dbname=gorm sslmode=disable") type User struct { Id int64 Age int64 Birthday time.Time Name string CreatedAt time.Time UpdatedAt time.Time } // Set database pool db.SetPool(10) // Create user = User{Name: "jinzhu", Age: 18, Birthday: time.Now()} db.Save(&user) // Update user.Name = "jinzhu 2" db.Save(&user) // Delete db.Delete(&user) // Get First matched record db.Where("name = ?", "jinzhu").First(&user) // Get All matched records db.Where("name = ?", "jinzhu").Find(&users) // Advanced Where Usage db.Where("name <> ?", "jinzhu").Find(&users) //// users -> select * from users name <> 'jinzhu'; db.Where("name = ? and age >= ?", "jinzhu", "22").Find(&users) //// users -> select * from users name = 'jinzhu' and age >= 22; db.Where("name in (?)", []string["jinzhu", "jinzhu 2"]).Find(&users) //// users -> select * from users name in ('jinzhu', 'jinzhu 2'); db.Where("name LIKE ?", "%jin%").Find(&users) //// users -> select * from users name LIKE "%jinzhu%"; db.Where("birthday < ?", time.Now()).Find(&users) // Inline search condition db.First(&user, 23) //// user -> select * from users where id = 23 limit 1; db.First(&user, "name = ?", "jinzhu") //// user -> select * from users where name = "jinzhu" limit 1; db.Find(&users, "name = ?", "jinzhu") //// users -> select * from users where name = "jinzhu"; db.Find(&users, "name <> ? and age > ?", "jinzhu", 20) //// users -> select * from users where name <> "jinzhu" and age > 20; // Select db.Select("name").Find(&users) //// users -> select name from users; // Order db.Order("age desc, name").Find(&users) //// users -> select * from users order by age desc, name; db.Order("age desc").Order("name").Find(&users) //// users -> select * from users order by age desc, name; // ReOrder db.Order("age desc").Find(&users1).Order("age", true).Find(&users2) //// users1 -> select * from users order by age desc; //// users2 -> select * from users order by age; // Limit db.Limit(3).Find(&users) //// users -> select * from users limit 3; db.Limit(10).Find(&users1).Limit(20).Find(&users2).Limit(-1).Find(&users3) //// users1 -> select * from users limit 10; //// users2 -> select * from users limit 20; //// users3 -> select * from users; // Offset //// select * from users offset 3; db.Offset(3).Find(&users) db.Offset(10).Find(&users1).Offset(20).Find(&users2).Offset(-1).Find(&users3) //// user1 -> select * from users offset 10; //// user2 -> select * from users offset 20; //// user3 -> select * from users; // Or db.Where("role = ?", "admin").Or("role = ?", "super_admin").Find(&users) //// users -> select * from users where role = 'admin' or role = 'super_admin'; // Count db.Where("name = ?", "jinzhu").Or("name = ?", "jinzhu 2").Find(&users).Count(&count) //// users -> select * from users where name = 'jinzhu' or name = 'jinzhu 2'; //// count -> select count(*) from users where name = 'jinzhu' or name = 'jinzhu 2'; db.Model(&User{}).Where("name = ?", "jinzhu").Count(&count) // CreatedAt (auto insert current time on create) If your struct has field CreatedAt, it will be filled with the current time when insert into database // UpdatedAt (auto update the time on save) If your struct has field UpdatedAt, it will be filled with the current time when update it // Callbacks Below callbacks are defined now: `BeforeCreate`, `BeforeUpdate`, `BeforeSave`, `AfterCreate`, `AfterUpdate`, `AfterSave` `BeforeDelete`, `AfterDelete` Callbacks is a function defined to a model, if the function return error, will prevent the database operations. func (u *User) BeforeUpdate() (err error) { if u.readonly() { err = errors.New("Read Only User") } return } // Pluck (get users's age as map) var ages []int64 db.Find(&users).Pluck("age", &ages) //// ages -> select age from users; var names []string db.Model(&User{}).Pluck("name", &names) //// names -> select name from users; // Query Chains db.Where("name <> ?", "jinzhu").Where("age >= ? and role <> ?", 20, "admin").Find(&users) //// users -> select * from users where name <> 'jinzhu' andd age >= 20 and role <> 'admin'; // Create Table with struct db.CreateTable(&User{}) // Run Raw SQL db.Exec("drop table users;") // Error Handling query := db.Where("name = ?", "jinzhu").First(&user) query := db.First(&user).Limit(10).Find(&users) //// query.Error -> the last error happened //// query.Errors -> all errors happened //// If an error happened, gorm will stop do insert, update, delete operations ``` ## Advanced Usage With Query Chain ```go // Already excited about the basic usage? Let's see some magic! db.First(&first_article).Count(&total_count).Limit(10).Find(&first_page_articles).Offset(10).Find(&second_page_articles) //// first_article -> select * from articles limit 1 //// total_count -> select count(*) from articles //// first_page_articles -> select * from articles limit 10 //// second_page_articles -> select * from articles limit 10 offset 10 db.Where("created_at > ?", "2013/10/10").Find(&cancelled_orders, "state = ?", "cancelled").Find(&shipped_orders, "state = ?", "shipped") //// cancelled_orders -> select * from orders where created_at > '2013/10/10' and state = 'cancelled' //// shipped_orders -> select * from orders where created_at > '2013/10/10' and state = 'shipped' db.Model(&Order{}).Where("amount > ?", 10000).Pluck("user_id", &paid_user_ids) //// paid_user_ids -> select user_id from orders where amount > 10000 db.Where("user_id = ?", paid_user_ids).Find(&:paid_users) //// paid_users -> select * from users where user_id in (10, 20, 99) db.Where("product_name = ?", "fancy_product").Find(&orders).Find(&shopping_cart) //// orders -> select * from orders where product_name = 'fancy_product' //// shopping_cart -> select * from carts where product_name = 'fancy_product' // Do you noticed the search table is different for above query, yay // Open your mind, add more cool examples ``` ## TODO * Update, Updates like rails's update_attribute, update_attributes * Soft Delete * Query with map or struct * FindOrInitialize / FindOrCreate * SQL Log * Auto Migration * Index, Unique, Valiations * SQL Query with goroutines * Only tested with postgres, confirm works with other database adaptors # Author **Jinzhu** * * *