[英]Connecting Gorm and Gin Golang
我正在嘗試使用Go
、 gorm
和gin
創建一個 API。 然而,使用直接 SQL 查詢確實有效,但它變得太麻煩了,我決定利用gorm
,這太棒了。 但是在我實施后,我無法再次啟動項目並不斷出錯
恐慌:運行時錯誤:無效的內存地址或零指針取消引用[信號SIGSEGV:分段違規代碼=0x1 addr=0xb0 pc=0x137b606]
我在這里粘貼了我的代碼和包。 如果有人能指出我的問題,我會很高興。
PostgresDoa.go
package postgres
import (
"fmt"
"log"
"net/http"
"github.com/AdieOlami/bookstore_users-api/domain/users"
"github.com/gin-gonic/gin"
"github.com/jinzhu/gorm"
)
type Sever struct {
DB *gorm.DB
Router *gin.Engine
}
func (server *Sever) Initialize(Dbdriver, DbUser, DbPassword, DbPort, DbHost, DbName string) {
var err error
if Dbdriver == "mysql" {
DBURL := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8&parseTime=True&loc=Local", DbUser, DbPassword, DbHost, DbPort, DbName)
server.DB, err = gorm.Open(Dbdriver, DBURL)
if err != nil {
fmt.Printf("Cannot connect to %s database", Dbdriver)
log.Fatal("This is the error:", err)
} else {
fmt.Printf("We are connected to the %s database", Dbdriver)
}
}
if Dbdriver == "postgres" {
DBURL := fmt.Sprintf("host=%s port=%s user=%s dbname=%s sslmode=disable password=%s", DbHost, DbPort, DbUser, DbName, DbPassword)
server.DB, err = gorm.Open(Dbdriver, DBURL)
if err != nil {
fmt.Printf("Cannot connect to %s database", Dbdriver)
log.Fatal("This is the error:", err)
} else {
fmt.Printf("We are connected to the %s database", Dbdriver)
}
}
server.DB.Debug().AutoMigrate(&users.User{}) //database migration
server.Router = gin.Default()
}
func (server *Sever) Run(addr string) {
fmt.Println("Listening to port 8080")
log.Fatal(http.ListenAndServe(addr, server.Router))
}
UserDto.go
package users
import (
"strings"
"github.com/AdieOlami/bookstore_users-api/domain/base"
"github.com/AdieOlami/bookstore_users-api/utils/errors"
"github.com/jinzhu/gorm"
uuid "github.com/satori/go.uuid"
)
type User struct {
base.Base
UserID uuid.UUID `gorm:"type:uuid;column:userId;not null;" json:"userId"`
FirstName string `gorm:"size:255;not null;unique;column:firstName" json:"firstName"`
LastName string `gorm:"size:255;not null;unique;column:lastName" json:"lastName"`
Email string `gorm:"size:100;not null;unique;column:email" json:"email"`
}
func (user *User) Validate() *errors.Error {
user.Email = strings.TrimSpace(strings.ToLower(user.Email))
if user.Email == "" {
return errors.NewBadRequestError("invalid email address")
}
return nil
}
func (user *User) SaveUser(db *gorm.DB) *errors.Error {
var err error
err = db.Debug().Create(&user).Error
if err != nil {
return errors.NewInteralServerError(err.Error())
}
return nil
}
用戶服務
package services
import (
"github.com/AdieOlami/bookstore_users-api/domain/users"
"github.com/AdieOlami/bookstore_users-api/utils/errors"
)
func (server *Server) CreateUser(user users.User) (*users.User, *errors.Error) {
if err := user.Validate(); err != nil {
return nil, err
}
if err := user.SaveUser(server.DB); err != nil {
return nil, err
}
return &user, nil
}
用戶控制器
package users
import (
"net/http"
"strconv"
"github.com/AdieOlami/bookstore_users-api/domain/users"
"github.com/AdieOlami/bookstore_users-api/services"
"github.com/AdieOlami/bookstore_users-api/utils/errors"
"github.com/gin-gonic/gin"
)
var (
server = services.Server{}
)
// CREATE USER
func CreateUser(c *gin.Context) {
var user users.User
if err := c.ShouldBindJSON(&user); err != nil {
// TODO: hnadle json error return bad request
err := errors.NewBadRequestError("invalid json body")
c.JSON(err.Status, err)
// fmt.Println(err.Error())
return
}
result, saveErr := server.CreateUser(user)
if saveErr != nil {
// TODO: handle user createing error
c.JSON(saveErr.Status, saveErr)
return
}
c.JSON(http.StatusCreated, result)
}
路由
package app
import (
"github.com/AdieOlami/bookstore_users-api/controllers/users"
"github.com/AdieOlami/bookstore_users-api/database/postgres"
)
var (
server = postgres.Sever{}
)
func initializeRoutes() {
server.Router.POST("/users", users.CreateUser)
}
應用程序
package app
import (
"os"
"github.com/AdieOlami/bookstore_users-api/seed"
_ "github.com/jinzhu/gorm/dialects/mysql" //mysql database driver
_ "github.com/jinzhu/gorm/dialects/postgres" //postgres database driver
)
func StartApplication() {
server.Initialize(os.Getenv("DB_DRIVER"), os.Getenv("DB_USER"), os.Getenv("DB_PASSWORD"), os.Getenv("DB_PORT"), os.Getenv("DB_HOST"), os.Getenv("DB_NAME"))
seed.Load(server.DB)
server.Run(":8088")
initializeRoutes()
}
在我的Main.go 中
func main() {
app.StartApplication()
}
據我從您的代碼中了解到。 您在Services
包中聲明了以下函數,而在Postgres
包中聲明了Server
對象。 這會導致將指針server *Server
取消引用到無效地址。 你必須在posgres
包中聲明這個函數。
func (server *Server) CreateUser(user users.User) (*users.User, *errors.Error) {
if err := user.Validate(); err != nil {
return nil, err
}
if err := user.SaveUser(server.DB); err != nil {
return nil, err
}
return &user, nil
}
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