背景

• 使用gin-session时，有时需要把session数据存在db中，下面是对mysql的支持，，后面还是postgres，mongo等支持

package main

import (
    "github.com/gin-contrib/sessions"
    gormsessions "github.com/gin-contrib/sessions/gorm"
    "github.com/gin-gonic/gin"
    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

func main() {
    db, err := gorm.Open(mysql.Open({dsn}), &gorm.Config{})
    if err != nil {
        panic(err)
    }
    store := gormsessions.NewStore(db, true, []byte("secret"))

    r := gin.Default()
    r.Use(sessions.Sessions("mysession", store))

    r.GET("/incr", func(c *gin.Context) {
        session := sessions.Default(c)
        var count int
        v := session.Get("count")
        if v == nil {
            count = 0
        } else {
            count = v.(int)
            count++
        }
        session.Set("count", count)
        session.Save()
        c.JSON(200, gin.H{"count": count})
    })
    r.Run(":8000")
}

参考原文：https://githubhelp.com/gin-contrib/sessions