使用Gin-Vue- Admin框架手动实现crud

在gva框架下自己手动实现一个CRUD的操作，该操作将会结合gen进行探讨学习，具体实现可以看下面代码的实现，项目目录层级分为api层，service层，model层，common层，router层，gen层。
我的这个实现方式有些许不太一样就是，我的修改并非传统的restful风格通过json方式进行传递这个id，也确保安全，所以这里的请求我不会用Get请求。

创建一个Banner

在gva下的server文件夹中找到plugin文件，然后在这里创建一个banner文件夹，我们的手动CRUD实现的代码就放置在这里，查看项目目录结构，banner包的路径是/server/plugin/banner。

model层

在model层中我们分为前端请求的参数request，以及后端返回的只response。在我们的model下会有一个创建表的结构体，也就是对应数据库字段的一个struct

banner的结构体

package modelimport "github.com/flipped-aurora/gin-vue-admin/server/global"type Banner struct {global.GVA_MODELUrl         string `json:"url" gorm:"column:url;comment:图片地址"`Path        string `json:"path" gorm:"column:path;comment:轮播图跳转地址"`Description string `json:"description" gorm:"column:description;comment:轮播介绍"`
}

model.request层

用于接收前端的参数

package requestimport ("github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/common""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model/dao""gorm.io/gen"
)type BannerList struct {common.PageInfoUrl         string `json:"url" gorm:"column:url;comment:图片地址"`Path        string `json:"path" gorm:"column:path;comment:轮播图跳转地址"`Description string `json:"description" gorm:"column:description;comment:轮播介绍"`
}func (r BannerList) BannerList() model.Banner {return model.Banner{Url:         r.Url,Path:        r.Path,Description: r.Description,}
}type BannerCreate struct {Url         string `json:"url" gorm:"column:url;comment:图片地址"`Path        string `json:"path" gorm:"column:path;comment:轮播图跳转地址"`Description string `json:"description" gorm:"column:description;comment:轮播介绍"`
}func (r BannerCreate) BannerCreate() model.Banner {return model.Banner{Url:         r.Url,Path:        r.Path,Description: r.Description,}
}type BannerUpdate struct {common.GetByIdUrl         string `json:"url" gorm:"column:url;comment:图片地址"`Path        string `json:"path" gorm:"column:path;comment:轮播图跳转地址"`Description string `json:"description" gorm:"column:description;comment:轮播介绍"`
}func (r BannerUpdate) BannerUpdate() model.Banner {return model.Banner{Url:         r.Url,Path:        r.Path,Description: r.Description,}
}func (r *BannerList) Search() common.GenScopes {return func(tx gen.Dao) gen.Dao {if r.Url != "" {tx = tx.Where(dao.Banner.Url.Eq(r.Url))}if r.Path != "" {tx = tx.Where(dao.Banner.Path.Eq(r.Path))}if r.Description != "" {tx = tx.Where(dao.Banner.Description.Eq(r.Description))}return tx}
}

model.response

返回给前端的一个模型

package responsetype Banner struct {Url         string `json:"url" gorm:"column:url;comment:图片地址"`Path        string `json:"path" gorm:"column:path;comment:轮播图跳转地址"`Description string `json:"description" gorm:"column:description;comment:轮播介绍"`
}

gen层

可以查看gorm的gen的使用，文档地址：https://gorm.io/gen/ 具体详细的看gorm的文档地址，关于gen的相关使用！！！（可以看目录结构我的文件存放地） gen是基于gorm封装的，在我们最后的banner/main.go中需要装配一下传入db,判断有没有db，没有db的调用需要传入db。

$ go get -u gorm.io/gen

package mainimport ("github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model""os""path/filepath""gorm.io/gen"
)// generate code
func main() {// 获取当前文件夹路径pwd, _ := os.Getwd()g := gen.NewGenerator(gen.Config{// 文件输出的位置（根据自己的情况而定）OutPath: filepath.Join(pwd, "plugin", "banner", "model", "dao"),// 输出的文件名OutFile: "query.go",// 输出模式Mode:    gen.WithDefaultQuery | gen.WithQueryInterface,FieldCoverable: true,WithUnitTest: false,})// 挂在自己的结构体在这里（根据自己的业务而定）g.ApplyBasic(new(model.Banner),)g.Execute()
}

common层

common层一般是放置一些公共资源需要使用的，比如一些返回信息，雪花算法生成id等。

common.common.go

package commonimport ("gorm.io/gen"
)type GetById struct {ID uint `json:"id" form:"id"`
}type GetByIds struct {IDs []uint `json:"ids" form:"ids"`
}// PageInfo 分页字段
type PageInfo struct {Page     int    `json:"page" form:"page"`         // 页码PageSize int    `json:"pageSize" form:"pageSize"` // 每页大小Keyword  string `json:"keyword" form:"keyword"`   //关键字
}// 分页函数
func (c *PageInfo) Paginate() func(tx gen.Dao) gen.Dao {return func(tx gen.Dao) gen.Dao {switch {case c.PageSize > 100:c.PageSize = 100case c.PageSize <= 0:c.PageSize = 10}offset := (c.Page - 1) * c.PageSizereturn tx.Offset(offset).Limit(c.PageSize)}
}type GenScopes func(tx gen.Dao) gen.Dao// 前端传什么返回什么
type PageResult struct {PageInfoList  interface{} `json:"list" swaggertype:"string" example:"interface 数据"`Count int64       `json:"count" swaggertype:"string" example:"int64 总数"`
}// list 返回函数
func NewPageResult(list interface{}, count int64, pageInfo PageInfo) PageResult {if list == nil {return PageResult{PageInfo: PageInfo{Page:     pageInfo.Page,PageSize: pageInfo.PageSize,},List:  []struct{}{},Count: count,}}return PageResult{PageInfo: PageInfo{Page:     pageInfo.Page,PageSize: pageInfo.PageSize,},List:  list,Count: count,}
}

common.message.go

存放返回信息还可以自定义一些返回状态码！

package commonconst (SuccessCreate  = "创建成功"ErrorCreate    = "创建失败"SuccessUpdate  = "更新成功"ErrorUpdate    = "更新失败"SuccessDelete  = "删除成功"ErrorDelete    = "删除失败"SuccessDeletes = "批量删除成功"ErrorDeletes   = "批量删除失败"SuccessFirst   = "查询一条成功"ErrorFirst     = "查询一条失败"SuccessList    = "查询成功"ErrorList      = "查询失败"ErrorCount     = "查询条数失败"ErrorRequest   = "参数有误"SuccessServer  = "服务端返回成功"ErrorServer    = "服务端返回失败"
)

service层

这里我一般是用于业务处理。

service.banner.go

package serviceimport ("context""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/common""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model/dao""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model/request""github.com/pkg/errors"
)var Banner = new(banner)type banner struct{}// List 查询多条
func (b *banner) List(ctx context.Context, info request.BannerList) (entity []*model.Banner, count int64, err error) {query := dao.Q.WithContext(ctx).Bannerquery = query.Scopes(info.Search())count, err = query.Count()if err != nil {return nil, 0, errors.Wrap(err, common.ErrorList)}entity, err = query.Scopes(info.Paginate()).Find()if err != nil {return nil, 0, errors.Wrap(err, common.ErrorCount)}return entity, count, nil
}// First 查询单条
func (b *banner) First(ctx context.Context, info common.GetById) (entity *model.Banner, err error) {query := dao.Q.WithContext(ctx).Bannerentity, err = query.Where(dao.Banner.ID.Eq(info.ID)).First()if err != nil {return nil, errors.Wrap(err, common.ErrorFirst)}return entity, nil
}// Create 新增
func (b *banner) Create(ctx context.Context, info request.BannerCreate) error {create := info.BannerCreate()query := dao.Q.WithContext(ctx).Bannererr := query.Create(&create)if err != nil {return errors.Wrap(err, common.ErrorCreate)}return nil
}// Update 修改
func (b *banner) Update(ctx context.Context, info request.BannerUpdate) error {update := info.BannerUpdate()query := dao.Q.WithContext(ctx).Banner_, err := query.Where(dao.Banner.ID.Eq(info.ID)).Updates(update)if err != nil {return errors.Wrap(err, common.ErrorUpdate)}return nil
}// Delete 单个删除
func (b banner) Delete(ctx context.Context, info common.GetById) error {query := dao.Q.WithContext(ctx).Banner_, err := query.Where(dao.Banner.ID.Eq(info.ID)).Delete()if err != nil {return errors.Wrap(err, common.ErrorDelete)}return nil
}// Deletes 批量删除
func (b *banner) Deletes(ctx context.Context, info common.GetByIds) error {query := dao.Q.WithContext(ctx).Banner_, err := query.Where(dao.Banner.ID.In(info.IDs...)).Delete()if err != nil {return errors.Wrap(err, common.ErrorDeletes)}return nil
}

api层

这里我一般是处理接受前端的请求

api.banner.go

这里与service.banner.go的接口一一对应

package apiimport ("github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/common""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model/request""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/response""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/service""github.com/gin-gonic/gin""net/http"
)var Banner = new(banner)type banner struct{}func (b banner) List(c *gin.Context) response.Response {var list request.BannerListerr := c.ShouldBindJSON(&list)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}lists, count, err := service.Banner.List(c.Request.Context(), list)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorServer}}return response.Response{Code:    http.StatusOK,Data:    common.NewPageResult(lists, count, list.PageInfo),Message: common.SuccessList,}
}func (b *banner) First(c *gin.Context) response.Response {var info common.GetByIderr := c.ShouldBindJSON(info)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}data, err := service.Banner.First(c.Request.Context(), info)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorServer}}return response.Response{Code:    http.StatusOK,Data:    data,Message: common.SuccessFirst,}
}func (b *banner) Create(c *gin.Context) response.Response {var create request.BannerCreateerr := c.ShouldBindJSON(&create)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}err = service.Banner.Create(c.Request.Context(), create)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorCreate}}return response.Response{Code: http.StatusOK, Message: common.SuccessCreate}
}func (b *banner) Update(c *gin.Context) response.Response {var update request.BannerUpdateerr := c.ShouldBindJSON(&update)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}err = service.Banner.Update(c.Request.Context(), update)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorUpdate}}return response.Response{Code: http.StatusOK, Message: common.SuccessUpdate}
}func (b *banner) Delete(c *gin.Context) response.Response {var info common.GetByIderr := c.ShouldBindJSON(&info)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}err = service.Banner.Delete(c.Request.Context(), info)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorDelete}}return response.Response{Code: http.StatusOK, Message: common.SuccessDelete}
}func (b *banner) Deletes(c *gin.Context) response.Response {var info common.GetByIdserr := c.ShouldBindJSON(&info)if err != nil {return response.Response{Code: http.StatusPaymentRequired, Message: common.ErrorRequest}}err = service.Banner.Deletes(c.Request.Context(), info)if err != nil {return response.Response{Code: http.StatusInternalServerError, Message: common.ErrorDeletes}}return response.Response{Code: http.StatusOK, Message: common.SuccessDeletes}
}

router层

这里是路由注册的地方

router.router.go

package routerimport ("github.com/flipped-aurora/gin-vue-admin/server/middleware""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/api""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/response""github.com/gin-gonic/gin"
)type Banner struct {router *gin.RouterGroup
}func NewBanner(router *gin.RouterGroup) *Banner {return &Banner{router}
}func (r Banner) Init() {group := r.router.Group("banner"){ // 不带日志中间件group.POST("list", response.Handler()(api.Banner.List))group.POST("first", response.Handler()(api.Banner.First))}{ // 带日志中间件group.Use(middleware.OperationRecord())group.POST("create", response.Handler()(api.Banner.Create))group.PUT("update", response.Handler()(api.Banner.Update))group.DELETE("delete", response.Handler()(api.Banner.Delete))group.DELETE("deletes", response.Handler()(api.Banner.Deletes))}
}

banner/main.go

package bannerimport ("github.com/flipped-aurora/gin-vue-admin/server/global""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/model/dao""github.com/flipped-aurora/gin-vue-admin/server/plugin/banner/router""github.com/gin-gonic/gin"
)var Plugin = new(plugin)type plugin struct{}func (p plugin) Register(group *gin.RouterGroup) {router.NewBanner(group).Init()// 这里需要自动装配一下调用dbif global.GVA_DB != nil {dao.SetDefault(global.GVA_DB)}
}func (p plugin) RouterPath() string {return ""
}