1.簡單的連線和CURD

package main

import (
	"github.com/jinzhu/gorm"
	_ "github.com/go-sql-driver/mysql"
	"time"
)

type User struct {
	User_id   int `gorm:"primary_key"` //指定主鍵並自增
	Name      string
	Pwd       string
	CreatedAt time.Time
	UpdatedAt time.Time
}

func main() {
	//建立連線
	db, err := gorm.Open("mysql", "root:
 
[email protected](127.0.0.1:3306)/gorm?charset=utf8&parseTime=True&loc=Local")
	if err != nil {
		panic("連線資料庫失敗")
	}
	defer db.Close()
	// 自動遷移模式
	//db.AutoMigrate(&User{})
	user := User{}

	//新增
	db.Create(&User{Name: "qwwqw", Pwd: "qwqwqwqwqw"})

	//查詢
	db.First(&user, 1).Scan(&user)

	//修改
	user.Name = "jinzhu 2"
	db.Save(&user)

	//刪除
	db.Where("user_id = ?",2).Delete(User{})

}
 

2.深入查詢操作

package main

import (
	"github.com/jinzhu/gorm"
	_ "github.com/go-sql-driver/mysql"
	"time"
	"fmt"
)

type User struct {
	User_id   int `gorm:"primary_key"` //指定主鍵並自增
	Name      string
	Pwd       string
	CreatedAt time.Time
	UpdatedAt time.Time
	Car       []Car `gorm:"ForeignKey:User_id;AssociationForeignKey:User_id"` //(一對多)指定外來鍵和關聯外來鍵
}

type Car struct {
	Car_id     int32 `gorm:"primary_key"`
	User_id    int
	Car_name   string
	Car_gongli string
}

func main() {
	//建立連線
	db, err := gorm.Open("mysql", "root:
 
[email protected](127.0.0.1:3306)/gorm?charset=utf8&parseTime=True&loc=Local")
	if err != nil {
		panic("連線資料庫失敗")
	}
	defer db.Close()
	// 自動遷移模式
	db.AutoMigrate(&User{}, &Car{})

	/**
	 * 查詢單條資料
	 * &是為了獲取結構體的記憶體地址,這樣指標傳遞速度較快
	 */
	user := User{}
	db.First(&user, 10)
	////SELECT * FROM users WHERE user_id = 10 LIMIT 1;

	db.Where("user_id = ?", 9).First(&user)
	////SELECT * FROM users WHERE user_id = 9 LIMIT 1;;
	fmt.Println(&user)

	/**
	 * 查詢多條資料
	 *
	 */
	users := []User{}
	db.Find(&users)
	////SELECT * FROM users

	db.Where("user_id = ? and name = ?", 10, "jinzhu").Find(&users)
	//// SELECT * FROM users WHERE name = "jinzhu" AND user_id = 20;

	db.Where("created_at > ?", "2018-09-22 08:50:09").Or("updated_at < ?", "2018-09-22 08:50:09").Order("created_at asc").Find(&users)
	//// SELECT * FROM users WHERE created_at = '2018-09-22 08:50:09' OR updated_at < '2018-09-22 08:50:09';
	fmt.Println(users)

	/**
	 * 關聯查詢
	 * 一對多 多對一 多對多
	 */
	db.Where("user_id = ?", 10).Preload("Car").Find(&user)

	db.Where("user_id = ?", 10).Preload("Car","car_name like ?","%田%").Find(&user)

	fmt.Println(&user)

}