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/_book
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/node_modules
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# GORM
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This is GORM
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# Summary
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* [GORM](README.md)
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* [Database](database/database.md)
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* [Connecting to a Database](database/connect-database.md)
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* [Migration](database/migration.md)
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* [Schema]()
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* [Models]()
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* [Model Defination]()
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* [Naming Conventions & Overriding]()
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* [Associations]()
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* [Belongs To]()
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* [Has One]()
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* [Has Many]()
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* [Many To Many]()
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* [Polymorphism]()
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* [Association Mode]()
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* [CRUD: Reading and Writing Data]()
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* [Create]()
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* [Query]()
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* [Preloading (Eager Loading)]()
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* [Update]()
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* [Delete / Soft Delete]()
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* [Callbacks]()
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* [Advanced Usage]()
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* [Error Handling]()
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* [Transactions]()
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* [Raw SQL & SQL Builder]()
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* [Composite Primary Key]()
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* [Overriding Logger]()
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* [Development]()
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* [Write Plugins]()
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{
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"title": "GORM Guide",
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"plugins": [
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"prism", "-highlight", "collapsible-menu", "toc",
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"github", "anchors", "edit-link"
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],
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"pluginsConfig": {
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"toc": {
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"addClass": true,
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"className": "toc"
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},
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"github": {
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"url": "https://github.com/jinzhu/gorm"
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},
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"edit-link": {
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"base": "https://github.com/jinzhu/gorm/edit/gh-pages",
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"label": "Edit This Page"
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}
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}
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}
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### Connecting To A Database
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```go
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import (
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"github.com/jinzhu/gorm"
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_ "github.com/lib/pq"
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_ "github.com/go-sql-driver/mysql"
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_ "github.com/mattn/go-sqlite3"
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)
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func init() {
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db, err := gorm.Open("postgres", "user=gorm dbname=gorm sslmode=disable")
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// db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True&loc=Local")
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// db, err := gorm.Open("sqlite3", "/tmp/gorm.db")
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// Use existing database connection
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dbSql, err := sql.Open("postgres", "user=gorm dbname=gorm sslmode=disable")
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db, err := gorm.Open("postgres", dbSql)
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}
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```
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```go
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// Get database connection handle [*sql.DB](http://golang.org/pkg/database/sql/#DB)
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db.DB()
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// Then you could invoke `*sql.DB`'s functions with it
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db.DB().Ping()
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db.DB().SetMaxIdleConns(10)
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db.DB().SetMaxOpenConns(100)
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// Disable table name's pluralization
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db.SingularTable(true)
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```
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## Database
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<!-- toc -->
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## Migration
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<!-- toc -->
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### Auto Migration
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Automatically migrate your schema, to keep your schema update to date
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**WARNING** AutoMigrate will ONLY create tables, columns and indexes if doesn't exist,
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WON'T change existing column's type or delete unused columns to protect your data
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```go
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db.AutoMigrate(&User{})
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db.AutoMigrate(&User{}, &Product{}, &Order{})
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// Add table suffix when create tables
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db.Set("gorm:table_options", "ENGINE=InnoDB").AutoMigrate(&User{})
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```
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### Has Table
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```go
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// Check if model `User`'s table has been created or not
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db.HasTable(&User{})
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// Check table `users` exists or not
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db.HasTable("users")
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```
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### Create Table
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```go
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db.CreateTable(&User{})
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db.Set("gorm:table_options", "ENGINE=InnoDB").CreateTable(&User{})
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// will append "ENGINE=InnoDB" to the SQL statement when creating table `users`
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```
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### Drop table
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```go
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db.DropTable(&User{})
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```
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### ModifyColumn
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Change column's type
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```go
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// change column description's data type to `text` for model `User`'s table
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db.Model(&User{}).ModifyColumn("description", "text")
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```
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### DropColumn
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```go
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db.Model(&User{}).DropColumn("description")
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```
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