sql：列索引0上的扫描错误，名称“”：不支持的扫描，存储驱动程序。值类型int64转换为类型* main.SMSBlast？

I'm now try restful api, where column SequenceID not auto incerement because on purpose ,my problem is with library gorm when I count like this countSequenceId := db.Debug().Table("SMSBlast2").Count(&smsblast1) , result is sql: Scan error on column index 0, name "": unsupported Scan, storing driver.Value type int64 into type *main.SMSBlast

package main

import (
    "encoding/json"
    "fmt"
    "github.com/gorilla/mux"
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mssql"
    "log"
    "net/http"
    "strconv"
    "time"
)

type SMSBlast struct {
    SequenceID   int `gorm:"primary_key";column:"SequenceID"`
    MobilePhone string `gorm:"column:MobilePhone"`
    Output  string  `gorm:"column:Output"`
    WillBeSentDate *time.Time `gorm:"column:WillBeSentDate"`
    SentDate *time.Time `gorm:"column:SentDate"`
    Status *string `gorm:"column:Status"`
    DtmUpd time.Time `gorm:"column:DtmUpd"`
}

func (SMSBlast) TableName() string {
    return "SMSBlast2"
}


func insertSMSBlast(w http.ResponseWriter, r *http.Request){
    fmt.Println("New Insert Created")
    db, err := gorm.Open("mssql", "sqlserver://sa:@localhost:1433?database=CONFINS")
    if err != nil{
        panic("failed to connect database")
    }
    defer db.Close()


    vars := mux.Vars(r)
    mobilephone := vars["mobilephone"]
    output := vars["output"]

    var(
        smsblast1 SMSBlast
    )
    countSequenceId := db.Debug().Raw("SELECT COUNT (*) FROM SMSBlast2").Scan(&smsblast1)
    fmt.Println(countSequenceId)
    msg, err :=  json.Marshal(countSequenceId)
    if err != nil{
        fmt.Println(err.Error())
    }



    sequenceid1,_ := strconv.Atoi(string(msg))
    fmt.Println("SequenceID : " , sequenceid1)

    smsblasts := SMSBlast{SequenceID: sequenceid1,MobilePhone: mobilephone,Output:output, DtmUpd: time.Now()}
    prindata := db.Create(&smsblasts)
    fmt.Println(prindata)
}


func handleRequests(){
    myRouter := mux.NewRouter().StrictSlash(true)
    myRouter.HandleFunc("/smsblaststest",allSMSBlasts).Methods("POST")
    myRouter.HandleFunc("/smsblaststestInsert/{mobilephone}/{output}", insertSMSBlast).Methods("POST")
    log.Fatal(http.ListenAndServe(":8080",myRouter))

}

func main(){
    fmt.Println("SMSBLASTS ORM")
    handleRequests()
}

You seem to assume that Gorm methods will return the result for you. That is not how it works. Gorm returns an error or a nil and you pass a reference to a variable where you want to store results. So to use Count() on something you would write something like

var count int
db.Model(&SMSBlast{}).Count(&count)
fmt.Printf("count: %d
", count)

That said, if you just want to make sure that you get a new sequence ID every time, why don't you use auto-increment?

type SMSBlast struct {
    SequenceID   int `gorm:"primary_key";column:"SequenceID";"AUTO_INCREMENT"`
    ... 
}