创建Gen

Create record

You can insert a record using the type-safe Create method, which only accepts pointer of current model when creating data

// u refer to query.user
user := model.User{Name: "Modi", Age: 18, Birthday: time.Now()}

u := query.User
err := u.WithContext(ctx).Create(&user) // pass pointer of data to Create

err // returns error

Create record with selected fields

You can use Select when creating data, it will only insert those selected fields

u := query.User
u.WithContext(ctx).Select(u.Name, u.Age).Create(&user)
// INSERT INTO `users` (`name`,`age`) VALUES ("modi", 18)

ignore fields with Omit

u := query.User
u.WithContext(ctx).Omit(u.Name, u.Age).Create(&user)
// INSERT INTO `users` (`address`, `birthday`) VALUES ("2021-08-17 20:54:12.000", 18)

Batch Insert

To efficiently insert large number of records, pass a slice to the Create method. GORM will generate a single SQL statement to insert all the data and backfill primary key values.

var users = []*model.User{{Name: "modi"}, {Name: "zhangqiang"}, {Name: "songyuan"}}
query.User.WithContext(ctx).Create(users...)

for _, user := range users {
user.ID // 1,2,3
}

You can specify batch size when creating with CreateInBatches, e.g:

var users = []*User{{Name: "modi_1"}, ...., {Name: "modi_10000"}}

// batch size 100
query.User.WithContext(ctx).CreateInBatches(users, 100)

It will works if you set CreateBatchSize in gorm.Config / gorm.Session

db, err := gorm.Open(sqlite.Open("gorm.db"), &gorm.Config{
CreateBatchSize: 1000,
})
// OR
db = db.Session(&gorm.Session{CreateBatchSize: 1000})

u := query.NewUser(db)

var users = []User{{Name: "modi_1"}, ...., {Name: "modi_5000"}}

u.WithContext(ctx).Create(&users)
// INSERT INTO users xxx (5 batches)

Upsert / On Conflict

Gen provides compatible Upsert support for different databases

import "gorm.io/gorm/clause"

// Do nothing on conflict
err := query.User.WithContext(ctx).Clauses(clause.OnConflict{DoNothing: true}).Create(&user)

// Update columns to default value on `id` conflict
err := query.User.WithContext(ctx).Clauses(clause.OnConflict{
Columns: []clause.Column{{Name: "id"}},
DoUpdates: clause.Assignments(map[string]interface{}{"role": "user"}),
}).Create(&users)
// MERGE INTO "users" USING *** WHEN NOT MATCHED THEN INSERT *** WHEN MATCHED THEN UPDATE SET ***; SQL Server
// INSERT INTO `users` *** ON DUPLICATE KEY UPDATE ***; MySQL

err := query.User.WithContext(ctx).Clauses(clause.OnConflict{Columns: []string{"Name", "Age"}}).Create(&user).Error
// MERGE INTO "users" USING *** WHEN NOT MATCHED THEN INSERT *** WHEN MATCHED THEN UPDATE SET "name"="excluded"."name"; SQL Server
// INSERT INTO "users" *** ON CONFLICT ("id") DO UPDATE SET "name"="excluded"."name", "age"="excluded"."age"; PostgreSQL
// INSERT INTO `users` *** ON DUPLICATE KEY UPDATE `name`=VALUES(name),`age`=VALUES(age); MySQL

// Update all columns, except primary keys, to new value on conflict
err := query.User.WithContext(ctx).Clauses(clause.OnConflict{
UpdateAll: true,
}).Create(&users)
// INSERT INTO "users" *** ON CONFLICT ("id") DO UPDATE SET "name"="excluded"."name", "age"="excluded"."age", ...;
// INSERT INTO `users` *** ON DUPLICATE KEY UPDATE `name`=VALUES(name),`age`=VALUES(age), ...; MySQL

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