Golang GORM 单表删除delete

删除只有一个操作，delete。也是先找到再去删除。 可以删除单条记录，也可以删除多条记录。

var s Student
	db.Debug().Delete(&s, "age = ?", 100)
	fmt.Println(s)

[15.878ms] [rows:1] DELETE FROM `student` WHERE age = 100

var s Student
	db.Debug().Take(&s, "age = ?", 101)
	db.Debug().Delete(&s)

[2.060ms] [rows:1] SELECT * FROM `student` WHERE age = 101 LIMIT 1

[4.494ms] [rows:1] DELETE FROM `student` WHERE `student`.`id` = 1

删除

警告：删除记录时，需要确保其主要字段具有值，GORM将使用主键删除记录，如果主要字段为空，GORM将删除模型的所有记录

// 删除存在的记录
db.Delete(&email)
 DELETE from emails where id=10;

// 为Delete语句添加额外的SQL选项
db.Set("gorm:delete_option", "OPTION (OPTIMIZE FOR UNKNOWN)").Delete(&email)
 DELETE from emails where id=10 OPTION (OPTIMIZE FOR UNKNOWN);

批量删除
删除所有匹配记录

db.Where("email LIKE ?", "%jinzhu%").Delete(Email{})
 DELETE from emails where email LIKE "%jinhu%";

db.Delete(Email{}, "email LIKE ?", "%jinzhu%")
 DELETE from emails where email LIKE "%jinhu%";