package errmsg
const (
  SUCCSE = 200
  ERROR  = 500
  // code= 1000... 用户模块的错误
  ERROR_USERNAME_USED    = 1001
  ERROR_PASSWORD_WRONG   = 1002
  //...
)
var codemsg = map[int]string{
  SUCCSE: "ok",
  ERROR: "FAIL",
  ERROR_USERNAME_USED:    "用户名已存在！",
  ERROR_PASSWORD_WRONG:   "密码错误",
  //...
}
func GetErrMsg(code int) string {
  return codemsg[code]
}
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//查询用户列表
func GetUsers(c *gin.Context) {
  pageSize, _ := strconv.Atoi(c.Query("pagesize"))
  pageNum, _ := strconv.Atoi(c.Query("pagenum"))
  username := c.Query("username")
  switch {
  case pageSize >= 100:
    pageSize = 100
  case pageSize <= 0:
    pageSize = 10
  }
  if pageNum == 0 {
    pageNum = 1
  }
  data, total := model.GetUsers(username, pageSize, pageNum)
  code := errmsg.SUCCSE
  c.JSON(
    http.StatusOK, gin.H{
      "status":  code,
      "data":    data,
      "total":   total,
      "message": errmsg.GetErrMsg(code),
    },
  )
}
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//GetUsers 查询用户列表
func GetUsers(username string, pageSize, pageNum int) ([]User, int64) {
  var users []User
  var total int64
  if username != "" {
    db.Select("id,username,role,created_at").Where(
      "username LIKE ?", username+"%",
    ).Limit(pageSize).Offset((pageNum - 1) * pageSize).Find(&users)
    db.Model(&users).Where(
      "username LIKE ?", username+"%",
    ).Count(&total)
    return users, total
  }
  db.Select("id,username,role,created_at").Limit(pageSize).Offset((pageNum - 1) * pageSize).Find(&users)
  db.Model(&users).Count(&total)
  return users, total
}
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type User struct {
  gorm.Model
  Username string `gorm:"type:varchar(20);not null " json:"username" validate:"required,min=4,max=12" label:"用户名"`
  Password string `gorm:"type:varchar(500);not null" json:"password" validate:"required,min=6,max=120" label:"密码"`
  Role     int    `gorm:"type:int;DEFAULT:2" json:"role" validate:"required,gte=2" label:"角色码"`
}
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package validator
import (
  "fmt"
  "ginVue3blog/utils/errmsg"
  //注意需要引入如下4个包
  "github.com/go-playground/locales/zh_Hans_CN" //中文包
  unTrans "github.com/go-playground/universal-translator" //翻译包
  "github.com/go-playground/validator/v10"
  zhTrans "github.com/go-playground/validator/v10/translations/zh"
  "reflect"
)
func Validate(data interface{}) (string, int) {
  validate := validator.New()
  uni := unTrans.New(zh_Hans_CN.New())
  trans, _ := uni.GetTranslator("zh_Hans_CN")
  err := zhTrans.RegisterDefaultTranslations(validate, trans)
  if err != nil {
    fmt.Println("err:", err)
  }
  validate.RegisterTagNameFunc(func(field reflect.StructField) string {
    label := field.Tag.Get("label")
    return label
  })
  err = validate.Struct(data)
  if err != nil {
    for _, v := range err.(validator.ValidationErrors) {
      return v.Translate(trans), errmsg.ERROR
    }
  }
  return "", errmsg.ERROR
}
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