type User struct { ID string`gorm:"default:uuid_generate_v3()"`// db func FirstName string LastName string Age uint8 FullName string`gorm:"->;type:GENERATED ALWAYS AS (concat(firstname,' ',lastname));default:(-);"` }
// 在`id`冲突时,将列更新为默认值 db.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
// 在`id`冲突时,将列更新为新值 db.Clauses(clause.OnConflict{ Columns: []clause.Column{{Name: "id"}}, DoUpdates: clause.AssignmentColumns([]string{"name", "age"}), }).Create(&users) // 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
// 在冲突时,更新除主键以外的所有列到新值。 db.Clauses(clause.OnConflict{ UpdateAll: true, }).Create(&users) // INSERT INTO "users" *** ON CONFLICT ("id") DO UPDATE SET "name"="excluded"."name", "age"="excluded"."age", ...;