tmrgo/demo/micro-go-course-master/section08/user/dao/user_dao.go

package dao

import (
	"time"
)

type UserEntity struct {

	ID int64
	Username string
	Password string
	Email string
	CreatedAt time.Time
}

func (UserEntity) TableName() string {
	return "user"
}

type UserDAO interface {
	SelectByEmail(email string)(*UserEntity, error)
	Save(user *UserEntity) error
}

type UserDAOImpl struct {

}

func (userDAO *UserDAOImpl) SelectByEmail(email string)(*UserEntity, error) {
	user := &UserEntity{}
	err := db.Where("email = ?", email).First(user).Error
	return user, err
}

func (userDAO *UserDAOImpl) Save(user *UserEntity) error {
	return db.Create(user).Error
}
func (userDAO *UserDAOImpl) SelectPassByUserName(username string)(*UserEntity, error) {
	user := &UserEntity{}
	err := db.Where("username = ?", username).First(user).Error
	return user, err
}
func (userDAO *UserDAOImpl) SelectPassByUserNameV2(username string)(*[]UserEntity, error) {

	users := make([]UserEntity,0)
	//err := db.Where("username = ?", username).First(user).Error
	row,err := db.Raw("select * from user").Rows()
	//row1:= db.Raw("select * from user")
	for row.Next(){
		user := &UserEntity{}
		err = row.Scan(&user.ID,&user.Username,&user.Password,&user.Email,&user.CreatedAt)
		if err != nil{
			println(err.Error())
		}
		users = append(users,*user)
	}
	row.Close()
	return &users, err
}

func (userDAO *UserDAOImpl) SelectPassByUserNameV3(username string)(*[]UserEntity, error) {

	users := make([]UserEntity,0)
	//err := db.Where("username = ?", username).First(user).Error
	db.Where("username = 'aoho'").Limit(1).Offset(1).Find(&users)
	//row1:= db.Raw("select * from user")
	
	return &users, nil
}