golang中如何使用结构体指针

我正在尝试用 gin post 和 get request 做一个简单的 golang，其他一切都很好，除了应该在结构变量中的值是空的部分之外，如果我没有很好地解释，这个例子就在下面我的代码（主要）

package main

import (
    //"fmt"
    "github.com/cosimmichael/assessment/app/db_client"
    "github.com/cosimmichael/assessment/app/controllers"
    "github.com/gin-gonic/gin"
    // you need to import go mod  init for this parkage to work
    // "github.com/cosimmichael/assessment/app/strutil"
    // "github.com/cosimmichael/assessment/app/routers"
    // "net/http"
)

func main(){
    db_client.InitialiseDBConnection()

    r := gin.Default()

    r.POST("api/v1/products/create", controller.CreateProducts)
    r.GET("api/v1/products/{product_id}/show", controller.GetPosts)

    if err := r.Run(":3000"); err != nil {
        panic(err.Error())
    }
    // router.HandleRoutes()
    // fmt.Println("Server Starting.. @ port :3000")
    // http.ListenAndServe(":3000", nil)
}

我的代码（控制器）

package controller

import (
    "net/http"
    "github.com/gin-gonic/gin"
    "github.com/cosimmichael/assessment/app/db_client"
    // "fmt"
)

type Post struct {
    id int64            `json: "id"`
    title *string       `json: "title"`
    description *string     `json: "description"`
}

func CreateProducts(c *gin.Context) {
    var reqBody Post
    if err := c.ShouldBindJSON(&reqBody); err != nil {
        c.JSON(http.StatusUnprocessableEntity, gin.H{
            "error": true,
            "message": "Invalid request body",
        })
        return
    }

    res, err := db_client.DBClient.Exec("INSERT INTO products (title, description) VALUES (?, ?);", 
        reqBody.title,//"testing",
        reqBody.description,//"Just testing something",
    )
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "error": true,
            "message": "Invalid request body2",
        })
        return
    }

    id, err := res.LastInsertId()
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "error": true,
            "message": "Invalid request body3",
        })
        return
    }

    c.JSON(http.StatusCreated, gin.H{
        "error": false,
        "id": id,
    })
}

func GetPosts(c *gin.Context){
    var posts []Post

    rows, err := db_client.DBClient.Query("SELECT id, title, description FROM products;")
    if err != nil {
        c.JSON(http.StatusUnprocessableEntity, gin.H{
            "error": true,
            "message": "Invalid request body",
        })
        return
    }

    for rows.Next(){
        var singlePost Post
        if err := rows.Scan(&singlePost.id, &singlePost.title, &singlePost.description); err != nil {
            c.JSON(http.StatusUnprocessableEntity, gin.H{
                "error": true,
                "message": "Invalid request body",
            })
            return
        }
        posts = append(posts, singlePost)
    }

    c.JSON(http.StatusOK, rows)
}

我的代码 db_client

package db_client

import (
    "database/sql"
    //"time"
    _ "github.com/go-sql-driver/mysql"
)

var DBClient *sql.DB

func InitialiseDBConnection(){
    //[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...&paramN=valueN]
    db, err := sql.Open("mysql","root:2580@tcp(localhost:3306)/grabit?parseTime=true")
    if err != nil {
        panic(err.Error())
    }
    err = db.Ping()
    if err != nil {
        panic(err.Error())
    }

    DBClient = db
}

现在，当我使用邮递员插入新行时，它会插入一个只有 id、没有标题或描述的空行，当我尝试获取时，我得到一个空数组，请问有什么问题，我是 golang 新手