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使用go的gin和gorm框架实现切换身份的接口，接收前端发送的JSON对象，查询数据库并更新，返回前端信息

接收前端发来的JSON对象，包含由openid和登陆状态组成的一个string和要切换的身份码int型

后端接收后判断要切换的身份是否低于该用户身份，是则更新数据库的登录状态为要切换的身份码，返回由openid和新的登录状态组成的string，否则返回错误码和权限不足的错误信息

测试代码

创建两个结构体，一个用来查询数据库，一个用来接收前端发送的JSON对象

连接数据库，接收前端POST请求，提取数据，查库，处理，返回信息

package mainimport ("github.com/gin-gonic/gin""gorm.io/driver/mysql""gorm.io/gorm""log""net/http""strconv"
)type User struct {Openid     string `json:"openid" gorm:"primaryKey"`IdCode     int    `json:"idcode"`LoginState int    `json:"login_state"`
}
type RequestData struct {OpenidAndLoginStatus string `json:"openidAndLoginState"`IdCodeToChange       int    `json:"idcodeToChange"`
}func main() {dsn := "username:password@tcp(host:port)/database?charset=utf8mb4&parseTime=True&loc=Local"db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})if err != nil {log.Fatal(err)}err = db.AutoMigrate(&User{})if err != nil {log.Fatal(err)}router := gin.Default()// 接口测试地址 192.168.160.128:8080/updaterouter.POST("/update", func(c *gin.Context) {var requestData RequestDataif err := c.ShouldBindJSON(&requestData); err != nil {c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid JSON data"})return}openidAndLoginState := requestData.OpenidAndLoginStatusopenID := openidAndLoginState[:len(openidAndLoginState)-1]loginStatus, _ := strconv.Atoi(openidAndLoginState[len(openidAndLoginState)-1:])idCode := requestData.IdCodeToChangevar user Userresult := db.Where("openid = ?", openID).First(&user)if result.Error != nil {c.JSON(http.StatusOK, gin.H{"error": "Invalid openid"})return}if user.IdCode >= idCode {user.LoginState = loginStatusresult = db.Save(&user)if result.Error != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": "Database save error"})return}} else {c.JSON(http.StatusOK, gin.H{"error": "Insufficient privileges"})return}response := openID + strconv.Itoa(idCode)c.JSON(http.StatusOK, gin.H{"response": response})})err = router.Run(":8080")if err != nil {return}
}