golang中xorm的基本使用

    简单的用法

package main

import (
_ "github.com/go-sql-driver/mysql"
"github.com/go-xorm/xorm"
"log"
)

//定义结构体(xorm支持双向映射)
type User struct {
User_id int64 `xorm:"pk autoincr"` //指定主键并自增
Name string `xorm:"unique"` //唯一的
Balance float64
Time int64 `xorm:"updated"` //修改后自动更新时间
Creat_time int64 `xorm:"created"` //创建时间
//Version int `xorm:"version"` //乐观锁
}

//定义orm引擎
var x *xorm.Engine

//创建orm引擎
func init() {
var err error
x, err = xorm.NewEngine("mysql", "root:root@tcp(127.0.0.1:3306)/xorm?charset=utf8")
if err != nil {
log.Fatal("数据库连接失败:", err)
}
if err := x.Sync(new(User)); err != nil {
log.Fatal("数据表同步失败:", err)
}
}

//增
func Insert(name string, balance float64) (int64, bool) {
user := new(User)
user.Name = name
user.Balance = balance
affected, err := x.Insert(user)
if err != nil {
return affected, false
}
return affected, true
}

//删
func Del(id int64) {
user := new(User)
x.Id(id).Delete(user)
}

//改
func update(id int64, user *User) bool {
affected, err := x.ID(id).Update(user)
if err != nil {
log.Fatal("错误:", err)
}
if affected == 0 {
return false
}
return true
}

//查
func getinfo(id int64) *User {
user := &User{User_id: id}
is, _ := x.Get(user)
if !is {
log.Fatal("搜索结果不存在!")
}
return user
}
   

    在gin中的用法

package main

import (
"github.com/gin-gonic/gin"
"./models"
"strconv"
)

//添加操作
func insert(c *gin.Context) {
name := c.Query("name")
if name == "" {
c.JSON(200, gin.H{"msg": "name不得为空!"})
return
}

money := c.Query("money")
if money == "" {
c.JSON(200, gin.H{"msg": "money不得为空!"})
return
}

Balance, _ := strconv.ParseFloat(money, 64)
//添加
user := models.User{}
user.Name = name
user.Balance = Balance
rel, err := models.X.Insert(user)

if rel == 0 || err != nil {
c.JSON(200, gin.H{"msg": "添加错误", "err": err, "rel": rel})
} else {
c.JSON(200, gin.H{"msg": "添加成功"})
}
}

//查询单个操作
func get(c *gin.Context) {
id := c.Query("id")
if id == "" {
c.JSON(200, gin.H{"msg": "id不得为空!"})
return
}
//string转int64
ids, _ := strconv.ParseInt(id, 10, 64)
//查询1
//user := &User{User_id: ids}
//rel, err := models.X.Get(user)
//查询2
user := &models.User{}
rel, err := models.X.Where("user_id = ?", ids).Get(user)

if !rel || err != nil {
c.JSON(200, gin.H{"msg": "查询错误"})
} else {
c.JSON(200, gin.H{"user": user})
}
}

//查询多条操作
func find(c *gin.Context) {
users := make(map[int64]models.User)
err := models.X.Find(&users)
if err != nil {
c.JSON(200, gin.H{"msg": err})
}
c.JSON(200, gin.H{"msg": users})
}

//修改操作
func updates(c *gin.Context) {
id := c.Query("id")
if id == "" {
c.JSON(200, gin.H{"msg": "id1不得为空!", "id": id})
return
}
ids, _ := strconv.ParseInt(id, 10, 64)

name := c.Query("name")
if name == "" {
c.JSON(200, gin.H{"msg": "name不得为空!"})
return
}

balance := c.Query("balance")
if balance == "" {
c.JSON(200, gin.H{"msg": "balance不得为空!"})
return
}
money, _ := strconv.ParseFloat(balance, 64)
//修改
user := models.User{}
user.Name = name
user.Balance = money
rel, err := models.X.Id(ids).Update(user)

if rel == 0 || err != nil {
c.JSON(200, gin.H{"msg": "修改错误!", "rel": rel, "err": err, "user": user})
} else {
c.JSON(200, gin.H{"mag": "修改成功"})
}
}

//删除操作
func delte(c *gin.Context) {
id := c.Query("id")
if id == "" {
c.JSON(200, gin.H{"msg": "id1不得为空!", "id": id})
return
}
//string转化int64
ids, _ := strconv.ParseInt(id, 10, 64)
//删除
user := models.User{}
rel, err := models.X.Id(ids).Delete(user)

if rel == 0 || err != nil {
c.JSON(200, gin.H{"msg": "删除错误!", "rel": rel, "err": err, "user": user})
} else {
c.JSON(200, gin.H{"mag": "删除成功"})
}
}

//事务的提交以及回滚
func gun(c *gin.Context) {
//创建session
session := models.X.NewSession()
defer session.Close()
//创建事务
err := session.Begin()
if err != nil {
c.JSON(200, gin.H{"err": err})
return
}
//操作事务,失败并回滚(模拟购物车结算情景)
car_id := c.Query("car_id")
if car_id == "" {
c.JSON(200, gin.H{"msg": "car_id1不得为空!", "car_id": car_id})
return
}

//查找购物车中的商品id
ids, _ := strconv.ParseInt(car_id, 10, 64)
car := &models.Car{Car_id: ids}
models.X.Get(car)

/**
* goods表库存减去销量
*/
//查询商品
goods := &models.Goods{Goods_id: car.Goods_id}
models.X.Get(goods)
//更新库存
good := models.Goods{}
good.Stock = goods.Stock - car.Num
rel4, err4 := session.ID(car.Goods_id).Update(good)
if rel4 == 0 || err4 != nil {
session.Rollback()
c.JSON(200, gin.H{"err4": err4, "rel4": rel4, "carid": car.Goods_id, "goodsid": goods.Goods_id, "Stock": good.Stock})
return
}

/**
* 用户扣费
*/
//查询用户
user := &models.User{User_id: car.User_id}
models.X.Get(user)
//更新价格
user_up := models.User{}
user_up.Balance = user.Balance - car.Total_price
rel1, err1 := session.ID(car.User_id).Update(user_up)
if err1 != nil || rel1 == 0 {
session.Rollback()
c.JSON(200, gin.H{"err1": err1, "rel1": rel1})
return
}

/**
* 删除用户的购物车信息
*/
rel2, err2 := session.Delete(car)
if err2 != nil || rel2 == 0 {
session.Rollback()
c.JSON(200, gin.H{"err2": err2, "rel2": rel2})
return
}
if user_up.Balance <= 0 {
session.Rollback()
c.JSON(200, gin.H{"msg": "余额不足"})
return
}

err3 := session.Commit()
if err3 != nil {
c.JSON(200, gin.H{"err3": err3})
return
}
c.JSON(200, gin.H{"msg": "用户扣费成功"})
}

func update_goods(c *gin.Context) {
id := c.Query("id")
if id == "" {
c.JSON(200, gin.H{"msg": "id1不得为空!", "id": id})
return
}
//string转换int64
ids, err := strconv.ParseInt(id, 10, 64)

goods_name := c.Query("goods_name")
if goods_name == "" {
c.JSON(200, gin.H{"msg": "goods_name不得为空!", "goods_name": goods_name})
return
}

price := c.Query("price")
if price == "" {
c.JSON(200, gin.H{"msg": "price不得为空!", "price": price})
return
}
prices, _ := strconv.ParseFloat(price, 64)

stock := c.Query("stock")
if stock == "" {
c.JSON(200, gin.H{"msg": "stock不得为空!", "stock": stock})
return
}
stocks, _ := strconv.ParseInt(stock, 10, 64)

//修改
goods := models.Goods{}
goods.Stock = stocks
goods.Goods_name = goods_name
goods.Price = prices
rel, err := models.X.ID(ids).Update(goods)
if rel == 0 || err != nil {
c.JSON(200, gin.H{"msg": "修改失败", "err": err, "stocks": stocks, "goods_name": goods_name, "prices": prices, "id": id})
} else {
c.JSON(200, gin.H{"msg": "修改成功"})
}
}

func shiwu(c *gin.Context) {
session := models.X.NewSession()
defer session.Close()

err := session.Begin()
user1 := models.User{Name: "xiaoxiao1", Balance: 100}
_, err = session.Insert(&user1)
if err != nil {
return
}

session.Rollback()
data := make(map[string]interface{})
data["msg"] = "错误"
c.JSON(200, session)
c.JSON(200, data)
return

//提交
err = session.Commit()
if err != nil {
return
}
}

func main() {
r := gin.Default()
r.GET("/insert", insert)
r.GET("/get", get)
r.GET("/find", find)
r.GET("/updates", updates)
r.GET("/delte", delte)
r.GET("/update_goods", update_goods)
r.GET("/gun", gun)
r.GET("/shiwu", shiwu)
r.Run(":88")
}

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