c943237207
|
||
|---|---|---|
| docker | ||
| res | ||
| server | ||
| web/dist | ||
| .gitignore | ||
| README.md | ||
README.md
目录
docker 安装
cd docker && docker-compose up -d
修改IP地址为安装容器主机的IP地址
# nginx配置
1. docker/nginx/nginx.conf
location /week/ {
proxy_pass http://服务器IP:8981/;
}
2. server/config.yaml
# mysql connect configuration
mysql:
path: 'mysqlIP:3306'
访问地址: http://localhost:8980即可
运行界面截图:
- goweb-gin-demo
- web框架gin
- gorm
- 通过Swagger测试接口, 中文文档
- 验证码获取及校验
- 获取菜单项
- 使用casbin 控制权限
- 文件上传及下载
- 代码自动生成
- 反射reflect
- GoWeb 发布
- 疑问及拓展
goweb-gin-demo
go web脚手架, 数据库及表结构
web框架gin
特性
-
快速 基于 Radix 树的路由，小内存占用。没有反射。可预测的 API 性能。
-
支持中间件 传入的 HTTP 请求可以由一系列中间件和最终操作来处理。 例如：Logger，Authorization，GZIP，最终操作 DB。
-
Crash 处理 Gin 可以 catch 一个发生在 HTTP 请求中的 panic 并 recover 它。这样，你的服务器将始终可用。例如，你可以向 Sentry 报告这个 panic！
-
JSON 验证 Gin 可以解析并验证请求的 JSON，例如检查所需值的存在。
-
路由组 更好地组织路由。是否需要授权，不同的 API 版本…… 此外，这些组可以无限制地嵌套而不会降低性能。
-
错误管理 Gin 提供了一种方便的方法来收集 HTTP 请求期间发生的所有错误。最终，中间件可以将它们写入日志文件，数据库并通过网络发送。
-
内置渲染 Gin 为 JSON，XML 和 HTML 渲染提供了易于使用的 API。
-
可扩展性 新建一个中间件非常简单，去查看 示例代码 吧。
服务创建及启动
官方demo
把ping映射在参数为(c *gin.Context)的方法
package main
import "github.com/gin-gonic/gin"
func main() {
r := gin.Default()
r.GET("/ping", func(c *gin.Context) {
c.JSON(200, gin.H{
"message": "pong",
})
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
endless 创建服务
func main() {
mux1 := mux.NewRouter()
mux1.HandleFunc("/hello", handler).
Methods("GET")
srv := endless.NewServer("localhost:4244", mux1)
srv.SignalHooks[endless.PRE_SIGNAL][syscall.SIGUSR1] = append(
srv.SignalHooks[endless.PRE_SIGNAL][syscall.SIGUSR1],
preSigUsr1)
srv.SignalHooks[endless.POST_SIGNAL][syscall.SIGUSR1] = append(
srv.SignalHooks[endless.POST_SIGNAL][syscall.SIGUSR1],
postSigUsr1)
err := srv.ListenAndServe()
if err != nil {
log.Println(err)
}
log.Println("Server on 4244 stopped")
os.Exit(0)
}
gorm
概述
- 全功能 ORM
- 关联 (Has One，Has Many，Belongs To，Many To Many，多态，单表继承)属于、多对多、多态、单表继承）
- Create，Save，Update，Delete，Find 中钩子方法保存/更新/删除/查找）
- 支持 Preload、Joins 的预加载，Joins
- 事务，嵌套事务，Save Point，Rollback To Saved Point、回滚到保存点
- Context、预编译模式、DryRun 模式DryRun 模式
- 批量插入，FindInBatches，Find/Create with Map，使用 SQL 表达式、Context Valuer 进行 CRUDBatches、使用 Map 查找/创建、使用 SQL Expr 和 Context Valuer 进行 CRUD
- SQL 构建器，Upsert，数据库锁，Optimizer/Index/Comment Hint，命名参数，子查询、Upsert、锁定、优化器/索引/注释提示、命名参数、子查询
- 复合主键，索引，约束
- Auto Migration
- 自定义 Logger
- 灵活的可扩展插件 API：Database Resolver（多数据库，读写分离）、Prometheus…PI：数据库解析器（多个数据库，读/写拆分）/ Prometheus...
- 每个特性都经过了测试的重重考验
- 开发者友好
模型定义
type User struct {
ID uint
Name string
Email *string
Age uint8
Birthday *time.Time
MemberNumber sql.NullString
ActivatedAt sql.NullTime
CreatedAt time.Time
UpdatedAt time.Time
}
GORM 使用结构体名的 蛇形命名 作为表名。对于结构体 User，根据约定，其表名为 users
您可以实现 Tabler 接口来更改默认表名，例如：
type Tabler interface {
TableName() string
}
// TableName 会将 User 的表名重写为 `profiles`
func (User) TableName() string {
return "profiles"
}
您可以使用 Table 方法临时指定表名，例如：
// 根据 User 的字段创建 `deleted_users` 表
db.Table("deleted_users").AutoMigrate(&User{})
// 从另一张表查询数据
var deletedUsers []User
db.Table("deleted_users").Find(&deletedUsers)
// SELECT * FROM deleted_users;
db.Table("deleted_users").Where("name = ?", "jinzhu").Delete(&User{})
// DELETE FROM deleted_users WHERE name = 'jinzhu';
连接数据库
import (
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
func main() {
// 参考 https://github.com/go-sql-driver/mysql#dsn-data-source-name 获取详情
dsn := "user:pass@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
}
连接池
GORM 使用 database/sql 维护连接池
sqlDB, err := db.DB()
// SetMaxIdleConns 设置空闲连接池中连接的最大数量
sqlDB.SetMaxIdleConns(10)
// SetMaxOpenConns 设置打开数据库连接的最大数量。
sqlDB.SetMaxOpenConns(100)
// SetConnMaxLifetime 设置了连接可复用的最大时间。
sqlDB.SetConnMaxLifetime(time.Hour)
CRUD
基本操作
# 创建记录
user := User{Name: "Jinzhu", Age: 18, Birthday: time.Now()}
result := db.Create(&user) // 通过数据的指针来创建
user.ID // 返回插入数据的主键
result.Error // 返回 error
result.RowsAffected // 返回插入记录的条数
----------------------------------------------------------------------
# 查询
// 获取第一条记录（主键升序）
db.First(&user)
// SELECT * FROM users ORDER BY id LIMIT 1;
// 获取一条记录，没有指定排序字段
db.Take(&user)
// SELECT * FROM users LIMIT 1;
// 获取最后一条记录（主键降序）
db.Last(&user)
// SELECT * FROM users ORDER BY id DESC LIMIT 1;
----------------------------------------------------------------------
# 更新
user.Name = "jinzhu 2"
user.Age = 100
db.Save(&user)
// UPDATE users SET name='jinzhu 2', age=100, birthday='2016-01-01', updated_at = '2013-11-17 21:34:10' WHERE id=111
----------------------------------------------------------------------
# 删除
// Email 的 ID 是 `10`
db.Delete(&email)
// DELETE from emails where id = 10;
// 带额外条件的删除
db.Where("name = ?", "jinzhu").Delete(&email)
// DELETE from emails where id = 10 AND name = "jinzhu";
----------------------------------------------------------------------
创建钩子
GORM 允许用户定义的钩子有 BeforeSave, BeforeCreate, AfterSave, AfterCreate 创建记录时将调用这些钩子方法，请参考 Hooks 中关于生命周期的详细信息
func (u *User) BeforeCreate(tx *gorm.DB) (err error) {
u.UUID = uuid.New()
if u.Role == "admin" {
return errors.New("invalid role")
}
return
}
通过Swagger测试接口, 中文文档
官方地址 ,其中包含swag可执行程序和gin-swaggergo web模块, 使用手册
查看地址为: http://IP:8888/swagger/index.html
// @BasePath /api/v1
// PingExample godoc
// @Summary ping example
// @Schemes
// @Description do ping
// @Tags example
// @Accept json
// @Produce json
// @Success 200 {string} Helloworld
// @Router /example/helloworld [get]
func Helloworld(g *gin.Context) {
g.JSON(http.StatusOK,"helloworld")
}
生成文档swag init
docs/
├── docs.go
├── swagger.json
└── swagger.yaml
需要注意把docs文件夹导入到代码中
import "goweb-gin-demo/docs"
- 如何获取到方法的注释呢?
验证码获取及校验
首选通过/base/captcha获取验证码,其中包含验证码图片地址:data:image/png;...
{
"code":0,
"data":{
"captchaId":"hrzSvHSdGo4Emm9oG9OY",
"picPath":"data:image/png;base64,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"
},
"msg":"验证码获取成功"
}
在用户登录时，请求的数据为:
{
"username": "admin",
"password": "123456",
"captcha": "153842",
"captchaId": "hrzSvHSdGo4Emm9oG9OY"
}
携带着验证码及验证码的Id, 框架通过Id去匹配输入的验证码。
登录城后后返回信息:
{
"code":0,
"data":{
"user":{
"ID":1,
"CreatedAt":"2021-10-25T14:53:31Z",
"UpdatedAt":"2021-10-25T14:53:31Z",
"uuid":"8e600b7f-3297-4979-a445-d218205ef9a6",
"userName":"admin",
"nickName":"超级管理员",
"sideMode":"dark",
"headerImg":"https:///qmplusimg.henrongyi.top/gva_header.jpg",
"baseColor":"#fff",
"activeColor":"#1890ff",
"authorityId":"888",
"authority":{
"CreatedAt":"2021-10-25T14:53:31Z",
"UpdatedAt":"2021-10-25T14:53:31Z",
"DeletedAt":null,
"authorityId":"888",
"authorityName":"普通用户",
"parentId":"0",
"dataAuthorityId":null,
"children":null,
"defaultRouter":"dashboard"
},
"authorities":[
{
"CreatedAt":"2021-10-25T14:53:31Z",
"UpdatedAt":"2021-10-25T14:53:31Z",
"DeletedAt":null,
"authorityId":"888",
"authorityName":"普通用户",
"parentId":"0",
"dataAuthorityId":null,
"children":null,
"defaultRouter":"dashboard"
},
{
"CreatedAt":"2021-10-25T14:53:31Z",
"UpdatedAt":"2021-10-25T14:53:31Z",
"DeletedAt":null,
"authorityId":"8881",
"authorityName":"普通用户子角色",
"parentId":"888",
"dataAuthorityId":null,
"children":null,
"defaultRouter":"dashboard"
},
{
"CreatedAt":"2021-10-25T14:53:31Z",
"UpdatedAt":"2021-10-25T14:53:31Z",
"DeletedAt":null,
"authorityId":"9528",
"authorityName":"测试角色",
"parentId":"0",
"dataAuthorityId":null,
"children":null,
"defaultRouter":"dashboard"
}
]
},
"token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJVVUlEIjoiOGU2MDBiN2YtMzI5Ny00OTc5LWE0NDUtZDIxODIwNWVmOWE2IiwiSUQiOjEsIlVzZXJuYW1lIjoiYWRtaW4iLCJOaWNrTmFtZSI6Iui2hee6p-euoeeQhuWRmCIsIkF1dGhvcml0eUlkIjoiODg4IiwiQnVmZmVyVGltZSI6ODY0MDAsImV4cCI6MTYzNjAyMDY2MSwiaXNzIjoicW1QbHVzIiwibmJmIjoxNjM1NDE0ODYxfQ.-E9YNI6YV3XLbC5GgXiftTBI7A5ZiIheH5dqwgwnaDA",
"expiresAt":1636020661000
},
"msg":"登录成功"
}
jwt token
**用户-角色权限-菜单项|API|资源对应关系图**
获取菜单项
api接口/api/menu/getMenu
头文件携带信息:
x-token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJVVUlEIjoiOGU2MDBiN2YtMzI5Ny00OTc5LWE0NDUtZDIxODIwNWVmOWE2IiwiSUQiOjEsIlVzZXJuYW1lIjoiYWRtaW4iLCJOaWNrTmFtZSI6Iui2hee6p-euoeeQhuWRmCIsIkF1dGhvcml0eUlkIjoiODg4IiwiQnVmZmVyVGltZSI6ODY0MDAsImV4cCI6MTYzNjAyMDY2MSwiaXNzIjoicW1QbHVzIiwibmJmIjoxNjM1NDE0ODYxfQ.-E9YNI6YV3XLbC5GgXiftTBI7A5ZiIheH5dqwgwnaDA
x-user-id: 1
- 角色对应着菜单项和API接口
通过userid获取权限id(SELECT * FROM sys_user_authorityWHEREsys_user_authority.sys_user_id = 1)
+-------------+----------------------------+
| sys_user_id | sys_authority_authority_id |
+-------------+----------------------------+
| 1 | 888 | 普通用户
| 1 | 8881 | 普通子用户
| 1 | 9528 | 测试用户
+-------------+----------------------------+
通过权限ID获取权限(SELECT * FROM sys_authoritiesWHEREsys_authorities.authority_id IN ('888','8881','9528'))
+---------------------+---------------------+------------+--------------+----------------+-----------+----------------+
| created_at | updated_at | deleted_at | authority_id | authority_name | parent_id | default_router |
+---------------------+---------------------+------------+--------------+----------------+-----------+----------------+
| 2021-10-25 14:53:31 | 2021-10-25 14:53:31 | NULL | 888 | ???? | 0 | dashboard |
| 2021-10-25 14:53:31 | 2021-10-25 14:53:31 | NULL | 8881 | ??????? | 888 | dashboard |
| 2021-10-25 14:53:31 | 2021-10-25 14:53:31 | NULL | 9528 | ???? | 0 | dashboard |
+---------------------+---------------------+------------+--------------+----------------+-----------+----------------+
返回数据样本
{
"code":0,
"data":{
"menus":[
{
"ID":1,
"CreatedAt":"2021-11-01T11:14:12Z",
"UpdatedAt":"2021-11-01T11:14:14Z",
"parentId":"0",
"path":"",
"name":"周报",
"hidden":false,
"component":"",
"sort":1,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"周报",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"1",
"children":[
{
"ID":2,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"1",
"path":"",
"name":"查看周报",
"hidden":false,
"component":"",
"sort":1,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"查看周报",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"2",
"children":null,
"parameters":[
]
},
{
"ID":3,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"1",
"path":"",
"name":"写周报",
"hidden":false,
"component":"",
"sort":2,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"写周报",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"3",
"children":null,
"parameters":[
]
},
{
"ID":4,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"1",
"path":"",
"name":"统计导出",
"hidden":false,
"component":"",
"sort":3,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"统计导出",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"4",
"children":null,
"parameters":[
]
},
{
"ID":5,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"1",
"path":"",
"name":"模板编辑",
"hidden":false,
"component":"",
"sort":4,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"模板编辑",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"5",
"children":null,
"parameters":[
]
}
],
"parameters":[
]
},
{
"ID":6,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"0",
"path":"",
"name":"设置",
"hidden":false,
"component":"",
"sort":2,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"设置",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"6",
"children":[
{
"ID":7,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"6",
"path":"",
"name":"用户密码",
"hidden":false,
"component":"",
"sort":1,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"用户密码",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"7",
"children":null,
"parameters":[
]
},
{
"ID":8,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"6",
"path":"",
"name":"统计规则",
"hidden":false,
"component":"",
"sort":2,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"统计规则",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"8",
"children":null,
"parameters":[
]
},
{
"ID":9,
"CreatedAt":"2021-11-01T11:16:40Z",
"UpdatedAt":"2021-11-01T11:16:43Z",
"parentId":"6",
"path":"",
"name":"用户管理",
"hidden":false,
"component":"",
"sort":3,
"meta":{
"keepAlive":false,
"defaultMenu":false,
"title":"用户管理",
"icon":"",
"closeTab":false
},
"authoritys":null,
"menuId":"9",
"children":null,
"parameters":[
]
}
],
"parameters":[
]
}
]
},
"msg":"获取成功"
}
使用casbin 控制权限
Casbin is a powerful and efficient open-source access control library. It provides support for enforcing authorization based on various access control models.
可以 在线 书写规则:
创建一个Casbin enforcer
import "github.com/casbin/casbin/v2"
e, err := casbin.NewEnforcer("path/to/model.conf", "path/to/policy.csv")
检查权限
sub := "alice" // the user that wants to access a resource.
obj := "data1" // the resource that is going to be accessed.
act := "read" // the operation that the user performs on the resource.
ok, err := e.Enforce(sub, obj, act)
if err != nil {
// handle err
}
if ok == true {
// permit alice to read data1
} else {
// deny the request, show an error
}
// You could use BatchEnforce() to enforce some requests in batches.
// This method returns a bool slice, and this slice's index corresponds to the row index of the two-dimensional array.
// e.g. results[0] is the result of {"alice", "data1", "read"}
results, err := e.BatchEnforce([][]interface{}{{"alice", "data1", "read"}, {"bob", "data2", "write"}, {"jack", "data3", "read"}})
文件上传及下载
文件上传及下载code
func main() {
router := gin.Default()
// 给表单限制上传大小 (默认 32 MiB)
// router.MaxMultipartMemory = 8 << 20 // 8 MiB
router.POST("/upload", func(c *gin.Context) {
// 单文件
file, _ := c.FormFile("file")
log.Println(file.Filename)
// 上传文件到指定的路径
// c.SaveUploadedFile(file, dst)
c.String(http.StatusOK, fmt.Sprintf("'%s' uploaded!", file.Filename))
})
router.Run(":8080")
}
// @Tags FileUploadAndDownload
// @Summary 文件下载
// @Security ApiKeyAuth
// @accept application/json
// @Produce application/json
// @Param fileName query string true "待下载的文件名"
// @Success 200 {string} string "{"success":true,"data":{},"msg":"文件下载成功"}"
// @Router /fileUploadAndDownload/download [get]
func (u *FileUploadAndDownloadApi) DownloadFile(c *gin.Context) {
fileName := c.Query("fileName")
//待下载的文件是存储本地的,如果存储在云盘，直接访问链接即可
//如果没有记录，也会报错，record not found
err, fileInfo := fileUploadAndDownloadService.FindFile(fileName)
if err != nil {
global.GLOBAL_LOG.Error("文件未找到!", zap.Any("err", err))
c.Redirect(http.StatusFound, "/404")
return
}
c.Header("Content-Type", "application/octet-stream")
c.Header("Content-Disposition", "attachment; filename="+fileInfo.Name)
c.Header("Content-Transfer-Encoding", "binary")
c.File(fileInfo.Url)
return
}
文件上传成功返回:
{
"code": 0,
"data": {
"file": {
"ID": 0,
"CreatedAt": "0001-01-01T00:00:00Z",
"UpdatedAt": "0001-01-01T00:00:00Z",
"name": "demo.c",
"url": "/Users/zero/Documents/uploads/file/fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.c",
"tag": "c",
"key": "fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.c"
}
},
"msg": "上传成功"
}
数据库信息:
mysql> select * from file_upload_and_downloads;
+----+---------------------+---------------------+------------+--------+--------------------------------------------------------------------------------------+------+---------------------------------------------------+
| id | created_at | updated_at | deleted_at | name | url | tag | key |
+----+---------------------+---------------------+------------+--------+--------------------------------------------------------------------------------------+------+---------------------------------------------------+
| 3 | 2021-11-02 09:04:27 | 2021-11-02 09:04:27 | NULL | demo.c | /Users/zero/Documents/uploads/file/fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.c | c | fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.c |
+----+---------------------+---------------------+------------+--------+--------------------------------------------------------------------------------------+------+---------------------------------------------------+
代码自动生成
gin-vue-admin提供代码自动生成功能，选择数据库表结构，可直接生成前端代码及后端代码，很方便
比如周报的表结构如下:
// 周报
{
"code": 0,
"data": {
"rewtReports": {
"ID": 100,
"CreatedAt": "2021-11-04T03:11:07Z",
"UpdatedAt": "2021-11-04T11:35:11Z",
"userName": "xiaoming",
"sendTo": [
{
"ID": 1,
"name": "xiao11"
},
{
"ID": 2,
"name": "xiao21"
}
],
"header": "周报",
"contents": [
{
"title": "本周工作",
"content": "<strong>本周工作</strong>这里"
},
{
"title": "下周计划",
"content": "<p>下周计划在这</p>这里"
}
],
"pictures": [
{
"key": "fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.png",
"name": "demo.png"
},
{
"key": "fe01ce2a7fbac8fafaed7c982a04e229_20211102170420.png",
"name": "demo1.png"
}
],
"attachments": [
{
"key": "fe01ce2a7fbac8fafaed7c982a04e229_20211102170427.txt",
"name": "demo.txt"
},
{
"key": "fe01ce2a7fbac8fafaed7c982a04e229_20211102170420.txt",
"name": "demo1.txt"
}
]
}
},
"msg": "操作成功"
}
// 评论
{
"id":100,
"comments":[
{""}
]
}
反射reflect
包反射实现运行时反射，允许程序操作任意类型的对象。典型的用法是取一个静态类型 interface{} 的值，通过调用 TypeOf 提取其动态类型信息，返回一个 Type。
对 ValueOf 的调用返回一个表示运行时数据的值。Zero 接受一个 Type 并返回一个表示该类型的零值的 Value。
有关 Go 中反射的介绍，请参阅 “反射定律”
动态调用有参数的函数
type T struct{}
func main() {
name := "Do"
t := &T{}
a := reflect.ValueOf(1111)
b := reflect.ValueOf("world")
in := []reflect.Value{a, b}
reflect.ValueOf(t).MethodByName(name).Call(in)
}
func (t *T) Do(a int, b string) {
fmt.Println("hello" + b, a)
}
GoWeb 发布
go build编译出moduleName的可执行文件，加载配置文件config.yaml即可运行。
疑问及拓展
为什么函数或方法中变量名很多都是大写字母开始的?
- 任何需要对外暴露的名字必须以大写字母开头，不需要对外暴露的则应该以小写字母开头。
但是gin-vue-admin代码中有很多大小，连方法参数都是大写字母开始的?
# 函数中的变量Router
Router := initialize.Routers()
# 方法参数Router
func (s *BaseRouter) InitBaseRouter(Router *gin.RouterGroup) (R gin.IRoutes) {
unsupported Scan, storing driver.Value type []uint8 into type *time.Time
需要在连接数据库时增加参数:
db, err := sqlx.Connect("mysql", "myuser:mypass@tcp(127.0.0.1:3306)/mydb?parseTime=true")
Sets the location for time.Time values (when using parseTime=true). "Local" sets the system's location. See time.LoadLocation for details.
Error 1075: Incorrect table definition; there can be only one auto column and it must be defined as a key
日志信息
2021/10/29 11:44:55 /Users/zero/go/pkg/mod/github.com/casbin/gorm-adapter/v3@v3.4.4/adapter.go:373 Error 1075: Incorrect table definition; there can be only one auto column and it must be defined as a key [7.259ms] [rows:0] ALTER TABLE
casbin_ruleADDidbigint unsigned AUTO_INCREMENT
断点调试gorm-adapter/v3@v3.4.4/adapter.go, 最后上网搜索发现版本问题。 把版本都降低了
github.com/casbin/casbin/v2 v2.11.0
github.com/casbin/gorm-adapter/v3 v3.0.2
查看http请求详情
通过查看gin.Context>>Request>>(Body io.ReadCloser)>>src>>R>>buf=>点击view就能看到http详情。
